kopia lustrzana https://github.com/roncarr880/QRP_LABS_WSPR
1751 wiersze
59 KiB
C++
1751 wiersze
59 KiB
C++
// !!! note: there is a loose connection somewhere in the headers or the jumper wires to the headers. It will
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// hang in setup on I2C commands sometimes. Maybe the clock or maybe the screw that contacts the USB
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// jack is keeping the boards too far apart. Just a note for when it happens again.
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// QRP_LABS_WSPR
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// Arduino, QRP Labs Arduino shield, SI5351 clock, QRP Labs RX module, QRP Labs relay board.
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// NOTE: The tx bias pot works in reverse, fully clockwise is off.
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// Added a CANADAUINO WWVB interface to keep time.
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// The CAT emulation is TenTec Argonaut V at 1200 baud.
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// Changed to 57600 as debug messages were too long for 1200 baud. ( bad decode after message print )
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// To set a new operation frequency for stand alone Frame Mode, restart the Arduino, start wsjt-x or HRD.
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// Tune to one of the magic WSPR frequencies and toggle TX (tune in wsjt will work).
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// The new frequency will be stored in EEPROM.
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// If using the band hopping feature of WSJT, make sure the first transmit is on the band you wish for
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// the default. Only one save is performed per Arduino reset.
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//
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// A 4:1 frequency relationship between the tx freq and the rx clock is maintained using the
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// R dividers in the SI5351. Dividers 1 - rx and 4 - tx will cover 1mhz to 30mhz
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// Dividers 16 - rx and 64 - tx will cover 40 khz to 2 mhz
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#include <FreqCount.h> // one UNO I have does not work correctly with this library, another one does
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#include <EEPROM.h>
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#define SI5351 0x60 // i2c address
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#define PLLA 26 // register address offsets for PLL's
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#define PLLB 34
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#define CLK0_EN 1
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#define CLK1_EN 2
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#define CLK2_EN 4
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// the starting frequency will be read out of EEPROM except the 1st time when EEPROM is blank
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#define FREQ 7038600 // starting freq when EEPROM is blank
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#define DIV 28 // starting divider for 4*freq*RDIV
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#define RDIV 1 // starting sub divider. 1 will cover less than 1mhz to > 30mhz.
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// 16 will cover 37khz to 2.3 mhz ( with the 4x factor it is 64 when transmitting )
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#define CAT_MODE 0 // computer control of TX
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#define FRAME_MODE 1 // self timed frame (stand alone mode)
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#define MUTE A1 // receiver module T/R switch pin
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#define START_CLOCK_FREQ 2700449800LL // *100 for setting fractional frequency ( 446600 )
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//#define START_CLOCK_FREQ 2700466600 // test too high
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//#define START_CLOCK_FREQ 2700426600 // test too low
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//#define CLK_UPDATE_THRESHOLD 59 // errors allowed per minute to consider valid sync to WWVB
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#define CLK_UPDATE_THRESHOLD2 48
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#define DEADBAND 25 // wwvb signal timing +-deadband
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#define stage(c) Serial.write(c)
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int last_error_count = 60;
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char val_print = ' ';
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// using even dividers between 6 and 254 for lower jitter
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// freq range 2 to 150 without using the post dividers
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// we are using the post dividers and can receive down to 40khz
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// vco 600 to 900
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uint64_t clock_freq = START_CLOCK_FREQ;
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uint64_t drift; // calibrate freq result used as a measure of temperature and mapped to correct
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// 27 master clock drift
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uint32_t freq = FREQ; // ssb vfo freq
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const uint32_t cal_freq = 3000000; // calibrate frequency
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long cal_result;
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const uint32_t cal_divider = 200;
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uint32_t divider = DIV;
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uint32_t audio_freq = 1466; // wspr 1400 to 1600 offset from base vfo freq
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uint8_t Rdiv = RDIV;
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uint8_t operate_mode = FRAME_MODE; // start in stand alone timing mode
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uint8_t wspr_tx_enable; // transmit enable
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uint8_t wspr_tx_cancel; // CAT control RX command cancels tx
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uint8_t cal_enable;
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long tm_correct_count = 60000; // add or sub one ms for time correction per this many ms
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int8_t tm_correction = 0; // 0, 1 or -1 time correction
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int8_t tm_correction2; // frame sync to wwvb signal falling edge
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// Download WSPRcode.exe from http://physics.princeton.edu/pulsar/K1JT/WSPRcode.exe and run it in a dos window
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// Type (for example): WSPRcode "K1ABC FN33 37" 37 is 5 watts, 30 is 1 watt, 33 is 2 watts, 27 is 1/2 watt
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// ( Use capital letters in your call and locator when typing in the message string. No extra spaces )
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// Using the editing features of the dos window, mark and copy the last group of numbers
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// Paste into notepad and replace all 3 with "3," all 2 with "2," all 1 with "1," all 0 with "0,"
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// Remove the comma on the end
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// the current message is "K1URC FN54 23"
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const char wspr_msg[] = {
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3, 3, 2, 2, 2, 0, 0, 2, 1, 2, 0, 2, 1, 1, 1, 2, 2, 2, 3, 0, 0, 1, 0, 1, 1, 3, 3, 2, 2, 0,
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2, 2, 0, 0, 3, 2, 0, 3, 0, 1, 2, 0, 2, 0, 0, 2, 3, 0, 1, 3, 2, 0, 1, 1, 2, 1, 0, 2, 0, 3,
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3, 2, 3, 2, 2, 2, 2, 1, 3, 2, 3, 0, 3, 0, 3, 0, 3, 2, 0, 3, 2, 0, 3, 0, 3, 1, 0, 2, 0, 1,
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1, 2, 1, 2, 3, 0, 2, 2, 3, 2, 2, 0, 2, 2, 1, 0, 2, 1, 2, 0, 3, 3, 1, 2, 3, 1, 2, 2, 3, 1,
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2, 1, 2, 0, 0, 1, 1, 3, 2, 2, 2, 2, 0, 1, 0, 1, 2, 0, 3, 1, 0, 2, 0, 0, 2, 2, 0, 1, 3, 0,
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1, 2, 3, 1, 0, 2, 2, 1, 3, 0, 2, 2
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};
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uint8_t band; // current band
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struct BAND {
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int pin; // band relay switching
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uint32_t low; // low frequency limit
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uint32_t high; // high frewquency limit
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};
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// relay board was jumpered to NOT have filter 1 always in line and antenna connects to the bnc
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// on the arduino shield. ( otherwise highest freq would need to be in position 1 and output would
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// be from the relay board )
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struct BAND band_info[6] = { // filter selected
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{ 7, 40000, 600000 }, // 630m
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{ A0, 600000, 2500000 }, // 160m
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{ 10, 2500000, 5000000 }, // 80m
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{ 11, 5000000, 11500000 }, // 30m
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{ 12,11500000, 20000000 }, // 17m
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{ A3,20000000, 30000000 } // 10m
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};
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// wspr frequencies for eeprom save routine. Only these frequencies will be saved.
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const uint32_t magic_freq[10] = {
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474200, 1836600, 3568600, 7038600, 10138700, 14095600, 18104600, 21094600, 24924600, 28124600
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};
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#define WWVB_OUT 9
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#define WWVB_PWDN 8 // was the low enable. Rewired the WWVB receiver to get power from this I/O pin.
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// this reverses the logic so it is now high to enable. With only two wires in the
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// cable, this seems like the best way to remove the need for the 9 volt battery
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// that was powering the wwvb receiver and to avoid taking the WSPR unit apart to
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// switch the wiring to +5 volts instead of an I/O pin.
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uint64_t wwvb_data, wwvb_sync, wwvb_errors;
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uint8_t wwvb_quiet = 0; // wwvb debug print flag, set to 1 for printing
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// or enter 1 CAT command( ?V for Rx only or #0 to stay in FRAME mode with logging )
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uint8_t wwvb_stats[8]; // bit distribution over 60 seconds
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uint8_t wwvb_last_err; // display last error character received ( will show what causes just one error )
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uint8_t frame_sec; // frame timer counts 0 to 120
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int frame_msec;
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// uint8_t tick; // start each minute, what was this for ? to match displayed time with computer time
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// but disturbs the trending bit display
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int FF = 3; // fixed part of fudge factor for frequency counter result ( counting 3 mhz signal )
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int ff = 0; // fractional part of the fudge factor ( floats not useful as limited in significant figures )
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// date, time keeping
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int gmon = 1,gday = 1,gyr = 20,ghr,gmin;
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int tot_days = 1;
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uint16_t leap = 1;
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#define TK 4 // keep time has been run
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#define TS 2 // time was set from WWVB decode
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#define TP 1 // print decode indicator
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uint8_t time_flags; // WWVB encodes the previous minute, flags to print the correct time
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uint8_t trends[60];
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uint8_t clr_trends;
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/***************************************************************************/
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void ee_save(){
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uint8_t i;
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static uint8_t last_i = 255;
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if( last_i != 255 ) return; // save only the freq of the 1st time transmitting after reset
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for( i = 0; i < 10; ++i ){
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if( freq == magic_freq[i] ) break;
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}
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if( i == 10 ) return; // not a wspr frequency
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// if( i == last_i ) return; // already wrote this one. ( redundant - only saving 1st power up tx freq now
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// instead of the last transmit freq. This allows wsjt band hopping tx
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// without wearing out the eeprom
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last_i = i;
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EEPROM.put(0,Rdiv); // put does not write if data matches
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EEPROM.put(1,freq); // and hopefully this will not take long when there is a match
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EEPROM.put(5,divider);
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}
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void ee_restore(){
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if( EEPROM[0] == 255 ) return; // blank eeprom
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EEPROM.get(0,Rdiv);
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EEPROM.get(1,freq);
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EEPROM.get(5,divider);
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//Serial.println(Rdiv);
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//Serial.println(freq);
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//Serial.println(divider);
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}
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void setup() {
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uint8_t i;
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Serial.begin(57600); // TenTec Argo V baud rate 1200
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i2init();
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ee_restore(); // get default freq for frame mode from eeprom
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pinMode(MUTE,OUTPUT); // receiver t/r switch
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digitalWrite(MUTE,LOW); // enable the receiver
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pinMode(WWVB_OUT, INPUT); // sample wwvb receiver signal
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pinMode(WWVB_PWDN, OUTPUT);
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// digitalWrite(WWVB_PWDN,LOW); // enable wwvb receiver
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digitalWrite(WWVB_PWDN,HIGH); // power the wwvb receiver with the I/O pin
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// set up the relay pins, exercise the relays, delay is 1.2 seconds, so reset at 59 seconds odd minute to be on time
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for( i = 0; i < 6; ++i ){
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pinMode(band_info[i].pin,OUTPUT);
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digitalWrite( band_info[i].pin,LOW );
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delay(200);
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digitalWrite( band_info[i].pin,HIGH );
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}
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i2cd(SI5351,16,0x4f); // clock 0, PLLA
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i2cd(SI5351,17,0x4f); // clock 1, PLLA
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i2cd(SI5351,18,0x6f); // clock 2, PLLB
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// set some divider registers that will never change
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for(i = 0; i < 3; ++i ){
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i2cd(SI5351,42+8*i,0);
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i2cd(SI5351,43+8*i,1);
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i2cd(SI5351,47+8*i,0);
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i2cd(SI5351,48+8*i,0);
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i2cd(SI5351,49+8*i,0);
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}
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si_pll_x(PLLB,cal_freq,cal_divider,0); // calibrate frequency on clock 2
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si_load_divider(cal_divider,2,0,1);
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si_pll_x(PLLA,Rdiv*4*freq,divider,0); // receiver 4x clock
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si_load_divider(divider,0,0,Rdiv*4); // TX clock 1/4th of the RX clock
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si_load_divider(divider,1,1,Rdiv); // load divider for clock 1 and reset pll's
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i2cd(SI5351,3,0xff ^ (CLK1_EN + CLK2_EN) ); // turn on clocks, receiver and calibrate
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// i2cd(SI5351,3,0xff ^ (CLK0_EN + CLK1_EN + CLK2_EN)); // testing only all on, remove tx PWR
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digitalWrite(band_info[band].pin,LOW); // in case this turns out to be the correct relay
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band_change(); // select the correct relay
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//Serial.println(F("Starting..."));
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pinMode(13,OUTPUT);
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}
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uint8_t band_change(){
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if( freq > band_info[band].low && freq <= band_info[band].high ) return 0;
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// band change needed
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digitalWrite(band_info[band].pin,HIGH);
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for( band = 0; band < 6; ++band ){
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if( freq > band_info[band].low && freq <= band_info[band].high ) break;
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}
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if( band == 6 ) band = 5; // default band
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digitalWrite( band_info[band].pin,LOW);
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return 1;
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}
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void qsy(uint32_t new_freq){ // change frequency
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unsigned char divf;
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uint32_t f4;
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static uint32_t old_freq = 0;
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divf = 0; // flag if we need to reset the PLL's
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if( (abs((int32_t)old_freq - (int32_t)new_freq) > 500000) || old_freq == 0){
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divf = 1; // large qsy from our current dividers
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old_freq = new_freq;
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}
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freq = new_freq;
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if( band_change() ) divf = 1; // check the proper relay is selected
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// force freq above a lower limit
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if( freq < 40000 ) freq = 40000;
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if( freq > 2000000 && Rdiv != 1 ) Rdiv = 1, divf = 1; // tx R is 4
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if( freq < 1000000 && Rdiv != 16 ) Rdiv = 16, divf = 1; // tx R is 64
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f4 = Rdiv * 4 * freq;
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f4 = f4 / 100000; // divide by zero next line if go below 100k on 4x vfo
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if( divf ) divider = 7500 / f4; // else we are using the current divider
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if( divider & 1) divider += 1; // make it even
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if( divider > 254 ) divider = 254;
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if( divider < 6 ) divider = 6;
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// setup the PLL and dividers if needed
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si_pll_x(PLLA,Rdiv*4*freq,divider,0);
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if( divf ){
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si_load_divider(divider,0,0,Rdiv*4); // tx at 1/4 the rx freq
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si_load_divider(divider,1,1,Rdiv); // load rx divider and reset PLL
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}
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}
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void loop() {
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static unsigned long ms;
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static int temp; // just for flashing the LED when there is I2C activity. Check for I2C hangup.
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if( Serial.availableForWrite() > 20 ) radio_control();
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temp += i2poll();
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if( ms != millis()){ // run once each ms
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ms = millis();
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frame_timer(ms);
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if( wspr_tx_enable || wspr_tx_cancel ) wspr_tx(ms);
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if( cal_enable ) run_cal();
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//wwvb_sample(ms);
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wwvb_sample2(ms);
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if( temp ){
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if( temp > 100 ) temp = 100;
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--temp;
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if( temp ) digitalWrite(13,HIGH);
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else digitalWrite(13,LOW);
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}
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}
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}
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void calc_date(){ // from total days and leap flag
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const int cal[2][12] =
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{ 31,28,31,30,31,30,31,31,30,31,30,31,
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31,29,31,30,31,30,31,31,30,31,30,31 };
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int i,d;
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d = tot_days;
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for( i = 0; i < 12; ++i ){
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if( d <= cal[leap][i] ) break;
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d -= cal[leap][i];
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}
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gmon = i + 1;
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gday = d;
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}
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void wwvb_decode(){ // WWVB transmits the data for the previous minute just ended
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uint16_t tmp;
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uint16_t tmp2;
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uint16_t yr;
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uint16_t hr;
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uint16_t mn;
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uint16_t dy;
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static unsigned int decodes;
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uint8_t i;
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// static uint64_t last_good = START_CLOCK_FREQ;
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tmp2 = frame_sec;
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tmp = frame_msec; // capture milliseconds value before it is corrected so we can print it.
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++decodes;
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yr = wwvb_decode2( 53, 0x1ff ); // year is 0 to 99
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dy = wwvb_decode2( 33, 0xfff ); // day is 0 to 365/366
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hr = wwvb_decode2( 18, 0x3f );
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mn = wwvb_decode2( 8, 0xff );
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leap = wwvb_decode2( 55, 0x1 );
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if( ( mn & 1 ) == 0 ){ //last minute was even so just hit the 60 second mark in the frame
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// only apply clock corrections in the middle of the two minute frame or may
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// otherwise mess up the frame timing
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if( frame_sec == 59 && frame_msec >= 500 ) ; // ok
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else if( frame_sec == 60 && frame_msec < 500 ) ; // ok
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else{ // way off, reset to the correct time
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frame_sec = 60;
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frame_msec = 0;
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FF = 3, ff = 0; // reset timing fudge factor
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clr_trends = 1; // the trend buckets will be incorrect now
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}
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}
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if( wwvb_quiet == 1 ){ // wwvb logging mode
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// Serial.print(decodes);
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// Serial.write(' '); Serial.print(tmp2); Serial.write('.'); Serial.print(tmp); // show jitter
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// Serial.print(" WWVB ");
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// Serial.print("20"); // the year 2100 bug
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// Serial.print( yr ); Serial.write(' ');
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// Serial.print( dy ); Serial.write(' ');
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// Serial.print( hr ); Serial.write(':');
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// if( mn < 10 ) Serial.write('0');
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// Serial.println(mn);
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}
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ghr = hr;
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gmin = mn;
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gyr = yr;
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tot_days = dy;
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calc_date( );
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time_flags |= TS;
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}
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// wwvb fields decode about the same way
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uint16_t wwvb_decode2( uint8_t pos, uint16_t mask ){
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uint16_t tmp;
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uint16_t val;
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tmp = ( wwvb_data >> ( 59 - pos ) ) & mask;
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val = 0;
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if( tmp & 0x800 ) val += 200;
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if( tmp & 0x400 ) val += 100;
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if( tmp & 0x100 ) val += 80;
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if( tmp & 0x80 ) val += 40;
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if( tmp & 0x40 ) val += 20;
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if( tmp & 0x20 ) val += 10;
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val += tmp & 0xf;
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return val;
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}
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// the original idea was to correct the 27 mhz clock using the UNO 16 mhz clock as a reference.
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// calibrating the SI5351 against the 16mhz clock does not seem to be viable.
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// the 16mhz clock varies as much or more than the 27mhz clock with changes in temperature
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// this function has been changed to correct the time keeping of the 16 meg clock based upon the 27 mhz reference
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// this seems to be working very well with no change in WSPR received delta time for over 48 hours.
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void run_cal(){ // count pulses on clock 2 wired to pin 5
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// IMPORTANT: jumper W4 to W7 on the arduino shield
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long error1,error2;
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if( cal_enable == 1 ){
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FreqCount.begin(1000); //
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++cal_enable;
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}
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if( FreqCount.available() ){
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cal_result = (long)FreqCount.read() + (long)FF;
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tm_correction = 0; // default
|
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if( cal_result > 2999996L && cal_result < 3000004 )tm_correction = 0, tm_correct_count = 30000;
|
|
else{
|
|
if( cal_result < 3000000L ){
|
|
tm_correction = -1, error1 = 3000000L - cal_result;
|
|
error2 = error1 - 1;
|
|
}
|
|
else if( cal_result > 3000000L ){
|
|
tm_correction = 1, error1 = cal_result - 3000000L;
|
|
error2 = error1 + 1;
|
|
}
|
|
|
|
if( error1 != 0 ) error1 = 3000000L / error1;
|
|
if( error2 != 0 ) error2 = 3000000L / error2;
|
|
|
|
tm_correct_count = interpolate( error1,error2,ff );
|
|
}
|
|
|
|
if( wwvb_quiet == 1 && tm_correction == 0 ){ // wwvb logging mode
|
|
// Serial.print( result ); Serial.write(' ');
|
|
// Serial.print( error ); Serial.write(' ');
|
|
// Serial.print(tm_correction); Serial.write(' ');
|
|
// Serial.print(tm_correct_count); Serial.write(' ');
|
|
}
|
|
FreqCount.end();
|
|
cal_enable = 0;
|
|
temp_correction();
|
|
}
|
|
}
|
|
|
|
|
|
// amt is a value from 0 to 99 representing the percentage
|
|
long interpolate( long val1, long val2, int amt ){
|
|
long diff;
|
|
long result;
|
|
|
|
diff = val2 - val1;
|
|
result = (diff * amt) / 100;
|
|
result += val1;
|
|
// Serial.print( val1 ); Serial.write(' '); Serial.print( val2 ); Serial.write(' ');
|
|
return result;
|
|
}
|
|
|
|
void clock_correction( int8_t val ){ // time keeping only, change the fudge factor
|
|
|
|
ff += val; // val is always -1,0,or 1
|
|
if( ff >= 100 ) ff = 0, ++FF; // keep ff in 0 to 99 range
|
|
if( ff < 0 ) ff = 99, --FF;
|
|
|
|
}
|
|
|
|
void temp_correction( ){ // short term drift correction with a linear map
|
|
uint64_t local_drift; // corrects for drift due to day/night temperature changes
|
|
|
|
if( wspr_tx_enable ) return; // ignore this when transmitting
|
|
|
|
local_drift = map( cal_result, 2999900, 3000000, 2000, 0 );
|
|
|
|
if( local_drift != drift ){
|
|
drift = local_drift;
|
|
si_pll_x(PLLB,cal_freq,cal_divider,0);
|
|
si_pll_x(PLLA,Rdiv*4*freq,divider,0); // new receiver 4x clock, transmitter 1x clock
|
|
}
|
|
}
|
|
|
|
|
|
// correct errors on bits that do not change often
|
|
// this version moves the counters up to a hard limit and moves down on different bit decoded
|
|
// decodes from trends only for 1 missed bit
|
|
// slips in time on weak signal as is called from frame_sync
|
|
char wwvb_trends( char val, uint8_t dat ){
|
|
static int i = 60;
|
|
static int unslip;
|
|
uint8_t count;
|
|
uint8_t trend_t,new_t;
|
|
int w;
|
|
|
|
#define LIMIT 6 // 2 min 30 max
|
|
#define SYNC 32
|
|
#define ONES 64
|
|
#define ZEROS 128
|
|
#define ERR 0
|
|
|
|
if( clr_trends ){ // reset the data
|
|
for( w = 0; w < 60; ++w ) trends[w] = 0;
|
|
clr_trends = 0;
|
|
}
|
|
|
|
if( unslip ) unslip = 0;
|
|
else if( ++i >= 60 ){
|
|
i = 0;
|
|
// the sample bucket ends at 1 sec past the time sampled. Test once per two minute frame
|
|
if( frame_sec < 60 && (frame_msec < 400 || frame_msec > 600) ){
|
|
if( frame_sec == 0 && frame_msec > 600 ) ; // ok, just early
|
|
else if( frame_sec == 1 && frame_msec < 400 ) ; // also ok
|
|
else if( frame_sec < 30 ) ++i; // running slow is normal on weak signals
|
|
else unslip = 1; // probably a time reset or decode happened
|
|
}
|
|
}
|
|
|
|
|
|
count = trends[i] & 31; // get existing trend data
|
|
trend_t = trends[i] & ( ONES | SYNC | ZEROS );
|
|
|
|
new_t = ERR; // assume error
|
|
if( val == 'S' ) new_t = SYNC;
|
|
if( val == '1' ) new_t = ONES;
|
|
if( val == '0' ) new_t = ZEROS;
|
|
|
|
if( trend_t == new_t && trend_t != ERR ){ // increment the trend if match
|
|
if( count < LIMIT ) ++count;
|
|
}
|
|
|
|
if( trend_t != new_t && new_t != ERR ){ // valid decode, bit changed, age type
|
|
if( count > 1 ) count -= ( trend_t == SYNC ? 1 : 2 ); // age existing type, favor sync
|
|
else{
|
|
count = 1;
|
|
trend_t = new_t;
|
|
}
|
|
}
|
|
|
|
trends[i] = trend_t + count; // save new trend values
|
|
|
|
// return history on errors with only 1 bit incorrect
|
|
if( new_t == ERR && count == LIMIT && i != 8 ){ // require no bit error for even odd minute
|
|
if( trend_t == ZEROS ){
|
|
if( bit_errors(dat,0xfc) < 2 ) val = 'o';
|
|
}
|
|
if( trend_t == ONES ){
|
|
if( bit_errors(dat,0xf0) < 2 ) val = 'i';
|
|
}
|
|
if( trend_t == SYNC ){
|
|
if( bit_errors(dat,0xc0) < 2 ) val = 's';
|
|
}
|
|
}
|
|
|
|
|
|
if( i == 0 && val == '.' ) val = 'x'; // view index on no decode no history
|
|
|
|
if( wwvb_quiet == 1 ){
|
|
Serial.write(val);
|
|
if( i%10 == 9 ) Serial.write(' ');
|
|
}
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
|
|
int bit_errors( uint8_t val, uint8_t mask ){
|
|
int count, i;
|
|
uint8_t b;
|
|
|
|
count = 0, b = 0x80;
|
|
val = val ^ mask; // val = error bits
|
|
for( i = 0; i < 8; ++i ){ // count the errors
|
|
if( val & b ) ++count;
|
|
b >>= 1;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
// correct errors on bits that do not change often
|
|
// this version moves the counters up to a hard limit and moves down on different bit decoded
|
|
// slips in time on weak signal as is called from frame_sync
|
|
char wwvb_trends( char val ){
|
|
static int i = 60;
|
|
static int unslip;
|
|
static uint8_t z; // stale out data counter
|
|
uint8_t count;
|
|
uint8_t trend_t,new_t;
|
|
int w;
|
|
|
|
#define LIMIT 10 // 2 min 30 max
|
|
#define SYNC 32
|
|
#define ONES 64
|
|
#define ZEROS 128
|
|
#define ERR 0
|
|
|
|
if( clr_trends ){ // reset the data
|
|
for( w = 0; w < 60; ++w ) trends[w] = 0;
|
|
clr_trends = 0;
|
|
}
|
|
|
|
if( unslip ) unslip = 0;
|
|
else if( ++i >= 60 ){
|
|
i = 0;
|
|
// the sample bucket ends at 1 sec past the time sampled. Test once per two minute frame
|
|
if( frame_sec < 60 && (frame_msec < 400 || frame_msec > 600) ){
|
|
if( frame_sec == 0 && frame_msec > 600 ) ; // ok, just early
|
|
else if( frame_sec == 1 && frame_msec < 400 ) ; // also ok
|
|
else if( frame_sec < 30 ) ++i; // running slow is normal on weak signals
|
|
else unslip = 1; // probably a time reset or decode happened
|
|
}
|
|
}
|
|
|
|
|
|
count = trends[i] & 31; // get existing trend data
|
|
trend_t = trends[i] & ( ONES | SYNC | ZEROS );
|
|
|
|
new_t = ERR; // assume error
|
|
if( val == 'S' ) new_t = SYNC;
|
|
if( val == '1' ) new_t = ONES;
|
|
if( val == '0' ) new_t = ZEROS;
|
|
|
|
if( trend_t == new_t && trend_t != ERR ){ // increment the trend if match
|
|
if( count < LIMIT ) ++count;
|
|
}
|
|
|
|
if( trend_t != new_t && new_t != ERR ){ // valid decode, bit changed, age type
|
|
if( count > 1 ) count -= ( trend_t == SYNC ? 1 : 2 ); // age existing type, favor sync
|
|
else{
|
|
count = 1;
|
|
trend_t = new_t;
|
|
}
|
|
}
|
|
|
|
if( new_t == ERR && wspr_tx_enable == 0){ // slowly stale out the data on errors
|
|
++z; // reduce count on 1 out of 16 errors
|
|
z &= 15;
|
|
if( z == 0 && count > 1 ) --count;
|
|
}
|
|
|
|
trends[i] = trend_t + count; // save new trend values
|
|
|
|
// return history on errors, do not send trend for the minutes,hours fields
|
|
if( new_t == ERR && ( i >= 19 || trend_t == SYNC || i == 4 || i == 10 || i == 11 || i == 14 ) ){
|
|
if( count == LIMIT ){
|
|
if( trend_t == ZEROS ) val = 'o';
|
|
if( trend_t == ONES ) val = 'i';
|
|
if( trend_t == SYNC ) val = 's';
|
|
}
|
|
}
|
|
|
|
|
|
if( i == 0 && val == '.' ) val = 'x'; // view index on no decode no history
|
|
|
|
if( wwvb_quiet == 1 ){
|
|
Serial.write(val);
|
|
if( i%10 == 9 ) Serial.write(' ');
|
|
}
|
|
|
|
return val;
|
|
|
|
}
|
|
*/
|
|
|
|
/*
|
|
// remove any errors on don't care bits, force to zero
|
|
// force syncs when we think we are in sync
|
|
char wwvb_trends( char val ){
|
|
const int zeros[17] = {4,10,11,14,20,21,24,34,35,36,37,38,44,54,56,57,58};
|
|
static int i,z;
|
|
static char last_val;
|
|
static int mod10;
|
|
static int q;
|
|
static int force;
|
|
static int fix;
|
|
static int syncs[4];
|
|
static int disable;
|
|
int w;
|
|
|
|
|
|
// double sync reset
|
|
if( last_val == 'S' && val == 'S' ){
|
|
if( i != 59 ){
|
|
i = 59; // index reset next lines of code
|
|
force = 0;
|
|
}
|
|
disable = 0;
|
|
}
|
|
last_val = val;
|
|
|
|
if( ++i >= 60 ){ // start of next minute
|
|
i = 0;
|
|
z = 0;
|
|
fix = 0;
|
|
if( frame_sec == 4 ) ++i; // slipping in time. Happens on very weak wwvb signal
|
|
// this test is 1 sec after the print at second 59
|
|
if( frame_sec > 4 && frame_sec < 56 ) disable = 1; // out of correction range, wait for double sync
|
|
}
|
|
|
|
if( val == 'S' && i > 4 && i < 56 ){ // syncs should all be modulo 9, double sync ignored,
|
|
syncs[0] = syncs[1]; syncs[1] = syncs[2]; syncs[2] = syncs[3]; syncs[3] = i; // for reporting only
|
|
w = i%10;
|
|
if( w == mod10 ) ++q;
|
|
else q = 0, force = 0;
|
|
mod10 = w;
|
|
|
|
if( q >= 3 && disable == 0 ){ // quorum of syncs on same modulus index
|
|
if( mod10 == 9 ) force = 1; // correct index
|
|
else if( mod10 >= 4 ) ++i; // slipped in time
|
|
else --i; // started early or some other issue like a time reset
|
|
q = 0;
|
|
}
|
|
}
|
|
|
|
w = val;
|
|
if( i == zeros[z] ){
|
|
++z;
|
|
if( force && val == '.' ) val = 'o'; // remove errors on don't care bits
|
|
}
|
|
if( force && ( i == 0 || i%10 == 9 ) && val != 'S' ) val = 's';
|
|
if( w != val ) ++fix;
|
|
|
|
if( fix == 9 ) force = 0; // too many fails a minute
|
|
|
|
if( wwvb_quiet == 1 && i == 59 ){ // report syncs
|
|
if( frame_sec < 100 ) Serial.write(' ');
|
|
if( frame_sec < 10 ) Serial.write(' ');
|
|
Serial.print(frame_sec); Serial.write(' ');
|
|
Serial.print("F "); Serial.print(force);
|
|
Serial.print(" Fix ");
|
|
// if( fix < 10 ) Serial.write(' ');
|
|
Serial.print(fix);
|
|
Serial.print(" Sync ");
|
|
for( w = 0; w < 4; ++w ){
|
|
if( syncs[w] < 10 ) Serial.write(' ');
|
|
Serial.print(syncs[w]); Serial.write(' ');
|
|
}
|
|
}
|
|
|
|
|
|
return val;
|
|
}
|
|
*/
|
|
|
|
void frame_timer( unsigned long t ){
|
|
static unsigned long old_t;
|
|
static uint8_t slot;
|
|
|
|
static long time_adjust;
|
|
// 16mhz clock measured at 16001111. Will gain 1ms in approx 14401 ms. Or 1 second in 4 hours.
|
|
// the calibrate function has been repurposed to correct the time keeping of the Arduino.
|
|
|
|
frame_msec += ( t - old_t );
|
|
time_adjust += (t - old_t);
|
|
if( time_adjust >= tm_correct_count && frame_msec != 0 ){
|
|
time_adjust -= tm_correct_count;
|
|
frame_msec += tm_correction; // add one, sub one or no change depending upon tm_correction value
|
|
}
|
|
|
|
if( tm_correction2 && frame_msec > 400 && frame_msec < 600 ){
|
|
frame_msec += tm_correction2;
|
|
tm_correction2 = 0;
|
|
}
|
|
|
|
old_t = t;
|
|
if( frame_msec >= 1000 ){
|
|
frame_msec -= 1000;
|
|
if( ++frame_sec >= 120 ){ // 2 minute slot time
|
|
frame_sec -= 120;
|
|
if( ++slot >= 8 ) slot = 0; // 10 slots is a 20 minute frame
|
|
if( slot == 1 && operate_mode == FRAME_MODE ) wspr_tx_enable = 1;
|
|
}
|
|
if( frame_sec == 116 ) cal_enable = 1; // do once per slot in wspr quiet time
|
|
if( frame_sec == 90 || frame_sec == 30 ) keep_time(); // half minute to avoid colliding with wwvb decodes
|
|
// if( frame_sec == 0 || frame_sec == 60 ) tick = 1; // print wwvb decode info if enabled
|
|
}
|
|
}
|
|
|
|
void keep_time(){
|
|
|
|
|
|
if( ++gmin >= 60 ){
|
|
gmin = 0;
|
|
if( ++ghr >= 24 ){
|
|
ghr = 0;
|
|
++tot_days;
|
|
if( tot_days > 365 + leap ) ++gyr, tot_days = 1;
|
|
calc_date();
|
|
}
|
|
}
|
|
|
|
if( time_flags & TS ) time_flags = TP + TK; // clear TS but flag a print of wwvb decode indicator
|
|
else time_flags = TK;
|
|
|
|
}
|
|
|
|
|
|
void wspr_tx( unsigned long t ){
|
|
static int i;
|
|
static unsigned long timer;
|
|
static uint8_t mod;
|
|
static unsigned int one_second;
|
|
|
|
// delay one second before starting transmission, this function is called once per millisecond
|
|
if( one_second < 1000 && wspr_tx_cancel == 0 ){
|
|
++one_second;
|
|
return;
|
|
}
|
|
|
|
if( wspr_tx_cancel ){ // quit early or just the end of the message
|
|
if( i < 160 ) i = 162; // let finish if near the end, else force done
|
|
}
|
|
|
|
if( (t - timer) < 683 ) return; // baud time is 682.66666666 ms
|
|
timer = t;
|
|
if( ++mod == 3 ) mod = 0, ++timer; // delay 683, 683, 682, etc.
|
|
|
|
if( i == 162 ){
|
|
tx_off();
|
|
i = 0; // setup for next time to begin at zero index
|
|
wspr_tx_cancel = wspr_tx_enable = 0; // flag done
|
|
one_second = 0;
|
|
return;
|
|
}
|
|
|
|
// set the frequency
|
|
si_pll_x(PLLA,Rdiv*4*(freq+audio_freq),divider,Rdiv*4*146*wspr_msg[i]);
|
|
if( i == 0 ) tx_on();
|
|
++i;
|
|
}
|
|
|
|
void tx_on(){
|
|
|
|
digitalWrite(MUTE,HIGH);
|
|
digitalWrite(WWVB_PWDN,LOW);
|
|
i2cd(SI5351,3,0xff ^ (CLK0_EN)); // tx clock on, other clocks off during tx
|
|
}
|
|
|
|
void tx_off(){
|
|
|
|
i2cd(SI5351,3,0xff ^ (CLK1_EN + CLK2_EN) ); // turn off tx, turn on rx and cal clocks
|
|
i2flush(); // wait for tx off to complete before enabling the rx
|
|
si_pll_x(PLLA,Rdiv*4*freq,divider,0); // return to RX frequency
|
|
digitalWrite(MUTE,LOW); // enable receiver
|
|
digitalWrite(WWVB_PWDN,HIGH); // enable wwvb receiver
|
|
|
|
ee_save(); // save this freq to use during stand alone mode(FRAME MODE).
|
|
}
|
|
|
|
|
|
void i2cd( unsigned char addr, unsigned char reg, unsigned char dat ){
|
|
// direct register writes. A possible speed up could be realized if one were
|
|
// to use the auto register inc feature of the SI5351
|
|
|
|
i2start(addr);
|
|
i2send(reg);
|
|
i2send(dat);
|
|
i2stop();
|
|
}
|
|
|
|
|
|
/****** SI5351 functions ******/
|
|
|
|
void si_pll_x(unsigned char pll, uint32_t freq, uint32_t out_divider, uint32_t fraction ){
|
|
uint64_t a,b,c;
|
|
uint64_t bc128; // floor 128 * b/c term of equations
|
|
uint64_t pll_freq;
|
|
uint64_t cl_freq;
|
|
|
|
uint32_t P1; // PLL config register P1
|
|
uint32_t P2; // PLL config register P2
|
|
uint32_t P3; // PLL config register P3
|
|
uint64_t r;
|
|
|
|
cl_freq = clock_freq;
|
|
|
|
//if( pll == PLLA ) cl_freq += drift; // drift not applied to 3 mhz calibrate freq
|
|
cl_freq += drift; // drift applied to 3 mhz. Pick one of these.
|
|
|
|
c = 1000000; // max 1048575
|
|
pll_freq = 100ULL * (uint64_t)freq + fraction; // allow fractional frequency for wspr
|
|
pll_freq = pll_freq * out_divider;
|
|
a = pll_freq / cl_freq ;
|
|
r = pll_freq - a * cl_freq ;
|
|
b = ( c * r ) / cl_freq;
|
|
bc128 = (128 * r)/ cl_freq;
|
|
P1 = 128 * a + bc128 - 512;
|
|
P2 = 128 * b - c * bc128;
|
|
if( P2 > c ) P2 = 0; // avoid negative numbers
|
|
P3 = c;
|
|
|
|
i2cd(SI5351, pll + 0, (P3 & 0x0000FF00) >> 8);
|
|
i2cd(SI5351, pll + 1, (P3 & 0x000000FF));
|
|
i2cd(SI5351, pll + 2, (P1 & 0x00030000) >> 16);
|
|
i2cd(SI5351, pll + 3, (P1 & 0x0000FF00) >> 8);
|
|
i2cd(SI5351, pll + 4, (P1 & 0x000000FF));
|
|
i2cd(SI5351, pll + 5, ((P3 & 0x000F0000) >> 12) | ((P2 & 0x000F0000) >> 16));
|
|
i2cd(SI5351, pll + 6, (P2 & 0x0000FF00) >> 8);
|
|
i2cd(SI5351, pll + 7, (P2 & 0x000000FF));
|
|
|
|
// i2cd( SI5351, 177, 0xAC ); // PLLA PLLB soft reset
|
|
}
|
|
|
|
|
|
// load new divider for specified clock, reset PLLA and PLLB if desired
|
|
void si_load_divider( uint32_t val, uint8_t clk , uint8_t rst, uint8_t Rdiv){
|
|
uint8_t R;
|
|
|
|
R = 0;
|
|
Rdiv >>= 1; // calc what goes in the R divisor field
|
|
while( Rdiv ){
|
|
++R;
|
|
Rdiv >>= 1;
|
|
}
|
|
R <<= 4;
|
|
|
|
val = 128 * val - 512;
|
|
i2cd( SI5351, 44+8*clk, ((val >> 16 ) & 3) | R );
|
|
i2cd( SI5351, 45+8*clk, ( val >> 8 ) & 0xff );
|
|
i2cd( SI5351, 46+8*clk, val & 0xff );
|
|
if( rst ) i2cd( SI5351, 177, 0xAC ); // PLLA PLLB soft reset needed
|
|
}
|
|
|
|
|
|
/*****************************************************************************************/
|
|
// TenTec Argonaut V CAT emulation
|
|
|
|
//int un_stage(){ /* send a char on serial */
|
|
//char c;
|
|
|
|
// if( stg_in == stg_out ) return 0;
|
|
// c = stg_buf[stg_out++];
|
|
// stg_out &= ( STQUESIZE - 1);
|
|
// Serial.write(c);
|
|
// return 1;
|
|
//}
|
|
|
|
#define CMDLEN 20
|
|
char command[CMDLEN];
|
|
uint8_t vfo = 'A';
|
|
|
|
void radio_control() {
|
|
static int expect_len = 0;
|
|
static int len = 0;
|
|
static char cmd;
|
|
|
|
char c;
|
|
int done;
|
|
|
|
if (Serial.available() == 0) return;
|
|
|
|
done = 0;
|
|
while( Serial.available() ){
|
|
c = Serial.read();
|
|
command[len] = c;
|
|
if(++len >= CMDLEN ) len= 0; /* something wrong */
|
|
if( len == 1 ) cmd = c; /* first char */
|
|
/* sync ok ? */
|
|
if( cmd == '?' || cmd == '*' || cmd == '#' ); /* ok */
|
|
else{
|
|
len= 0;
|
|
return;
|
|
}
|
|
if( len == 2 && cmd == '*' ) expect_len = lookup_len(c); /* for binary data on the link */
|
|
if( (expect_len == 0 && c == '\r') || (len == expect_len) ){
|
|
done = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( done == 0 ) return; /* command not complete yet */
|
|
|
|
if( cmd == '?' ){
|
|
get_cmd();
|
|
operate_mode = CAT_MODE; // switch modes on query cat command
|
|
if( wwvb_quiet < 2 ) ++wwvb_quiet; // only one CAT command enables wwvb logging, 2nd or more turns it off
|
|
}
|
|
if( cmd == '*' ) set_cmd();
|
|
if( cmd == '#' ){
|
|
pnd_cmd();
|
|
if( wwvb_quiet < 2 ) ++wwvb_quiet; // allow FRAME mode and the serial logging at the same time
|
|
}
|
|
|
|
/* prepare for next command */
|
|
len = expect_len= 0;
|
|
stage('G'); /* they are all good commands */
|
|
stage('\r');
|
|
|
|
}
|
|
|
|
int lookup_len(char cmd2){ /* just need the length of the command */
|
|
int len;
|
|
|
|
|
|
switch(cmd2){ /* get length of argument */
|
|
case 'X': len = 0; break;
|
|
case 'A':
|
|
case 'B': len = 4; break;
|
|
case 'E':
|
|
case 'P':
|
|
case 'M': len = 2; break;
|
|
default: len = 1; break ;
|
|
}
|
|
|
|
return len+3; /* add in *A and cr on the end */
|
|
}
|
|
|
|
void set_cmd(){
|
|
char cmd2;
|
|
unsigned long val4;
|
|
|
|
cmd2 = command[1];
|
|
switch(cmd2){
|
|
case 'X': stage_str("RADIO START"); stage('\r'); break;
|
|
case 'O': /* split */
|
|
break;
|
|
case 'A': // set frequency
|
|
case 'B':
|
|
val4 = get_long();
|
|
qsy(val4);
|
|
break;
|
|
case 'E':
|
|
if( command[2] == 'V' ) vfo = command[3];
|
|
break;
|
|
case 'W': /* bandwidth */
|
|
break;
|
|
case 'K': /* keying speed */
|
|
break;
|
|
case 'T': /* added tuning rate as a command */
|
|
break;
|
|
} /* end switch */
|
|
}
|
|
|
|
void get_cmd(){
|
|
char cmd2;
|
|
long arg;
|
|
int len;
|
|
|
|
cmd2 = command[1];
|
|
stage(cmd2);
|
|
switch(cmd2){
|
|
case 'A': // get frequency
|
|
case 'B':
|
|
arg = freq;
|
|
stage_long(arg);
|
|
break;
|
|
case 'V': /* version */
|
|
stage_str("ER 1010-516");
|
|
break;
|
|
case 'W': /* receive bandwidth */
|
|
stage(30);
|
|
break;
|
|
case 'M': /* mode. 1 is USB USB ( 3 is CW ) */
|
|
stage('1'); stage('1');
|
|
break;
|
|
case 'O': /* split */
|
|
stage(0);
|
|
break;
|
|
case 'P': /* passband slider */
|
|
stage_int( 3000 );
|
|
break;
|
|
case 'T': /* added tuning rate command */
|
|
break;
|
|
case 'E': /* vfo mode */
|
|
stage('V');
|
|
stage(vfo);
|
|
break;
|
|
case 'S': /* signal strength */
|
|
stage(7);
|
|
stage(0);
|
|
break;
|
|
case 'C': // transmitting status
|
|
stage(0);
|
|
if( wspr_tx_enable ) stage(1);
|
|
else stage(0);
|
|
break;
|
|
case 'K': /* wpm on noise blanker slider */
|
|
stage( 15 - 10 );
|
|
break;
|
|
default: /* send zeros for unimplemented commands */
|
|
len= lookup_len(cmd2) - 3;
|
|
while( len-- ) stage(0);
|
|
break;
|
|
}
|
|
|
|
stage('\r');
|
|
}
|
|
|
|
|
|
void stage_str( String st ){
|
|
int i;
|
|
char c;
|
|
|
|
for( i = 0; i < st.length(); ++i ){
|
|
c= st.charAt( i );
|
|
stage(c);
|
|
}
|
|
}
|
|
|
|
void stage_long( long val ){
|
|
unsigned char c;
|
|
|
|
c= val >> 24;
|
|
stage(c);
|
|
c= val >> 16;
|
|
stage(c);
|
|
c= val >> 8;
|
|
stage(c);
|
|
c= val;
|
|
stage(c);
|
|
}
|
|
|
|
|
|
unsigned long get_long(){
|
|
union{
|
|
unsigned long v;
|
|
unsigned char ch[4];
|
|
}val;
|
|
int i;
|
|
|
|
for( i = 0; i < 4; ++i) val.ch[i] = command[5-i]; // or i+2 for other endian
|
|
return val.v;
|
|
}
|
|
|
|
void stage_int( int val ){
|
|
unsigned char c;
|
|
c= val >> 8;
|
|
stage(c);
|
|
c= val;
|
|
stage(c);
|
|
}
|
|
|
|
void stage_num( int val ){ /* send number in ascii */
|
|
char buf[35];
|
|
char c;
|
|
int i;
|
|
|
|
itoa( val, buf, 10 );
|
|
i= 0;
|
|
while( c = buf[i++] ) stage(c);
|
|
}
|
|
|
|
void pnd_cmd(){
|
|
char cmd2;
|
|
|
|
cmd2 = command[1];
|
|
switch(cmd2){
|
|
case '0': // enter rx mode
|
|
if( wspr_tx_enable ) wspr_tx_cancel = 1;
|
|
break;
|
|
case '1': wspr_tx_enable = 1; break; // TX
|
|
}
|
|
|
|
}
|
|
|
|
/***** non-blocking, write only, I2C functions ******/
|
|
|
|
#define I2BUFSIZE 64
|
|
int i2buf[I2BUFSIZE];
|
|
uint8_t i2in, i2out;
|
|
|
|
// use some upper bits in the buffer for control
|
|
#define ISTART 0x100
|
|
#define ISTOP 0x200
|
|
|
|
void i2init()
|
|
{
|
|
TWBR = 72; // 12 400k for 16 meg clock. 72 100k ((F_CPU/freq)-16)/2
|
|
TWSR = 0;
|
|
TWDR = 0xFF;
|
|
PRR = 0;
|
|
}
|
|
|
|
void i2start( unsigned char adr ){
|
|
int dat;
|
|
// shift the address over and add the start flag
|
|
dat = ( adr << 1 ) | ISTART;
|
|
i2send( dat );
|
|
}
|
|
|
|
void i2send( int data ){ // just save stuff in the buffer
|
|
uint8_t t;
|
|
|
|
// but check for space first
|
|
t = ( i2in + 1 ) & (I2BUFSIZE - 1);
|
|
while( t == i2out ) i2poll(); // wait for space
|
|
|
|
i2buf[i2in++] = data;
|
|
i2in &= (I2BUFSIZE - 1);
|
|
}
|
|
|
|
void i2stop( ){
|
|
i2send( ISTOP ); // que a stop condition
|
|
}
|
|
|
|
|
|
void i2flush(){ // call poll to empty out the buffer.
|
|
|
|
while( i2poll() );
|
|
}
|
|
|
|
|
|
uint8_t i2poll(){ // everything happens here. Call this from loop.
|
|
static uint8_t state = 0;
|
|
static int data;
|
|
static uint8_t delay_counter;
|
|
|
|
// the library code has a delay after loading the transmit buffer
|
|
// and before the status bits are tested for transmit active
|
|
if( delay_counter ){
|
|
--delay_counter;
|
|
return (16 + delay_counter);
|
|
}
|
|
|
|
switch( state ){
|
|
case 0: // idle state or between characters
|
|
if( i2in != i2out ){ // get next character
|
|
data = i2buf[i2out++];
|
|
i2out &= (I2BUFSIZE - 1 );
|
|
|
|
if( data & ISTART ){ // start
|
|
data &= 0xff;
|
|
// set start condition
|
|
TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
|
|
state = 1;
|
|
}
|
|
else if( data & ISTOP ){ // stop
|
|
// set stop condition
|
|
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
|
|
state = 3;
|
|
}
|
|
else{ // just data to send
|
|
TWDR = data;
|
|
TWCR = (1<<TWINT) | (1<<TWEN);
|
|
delay_counter = 10; // delay for transmit active to come true
|
|
state = 2;
|
|
}
|
|
}
|
|
break;
|
|
case 1: // wait for start to clear, send saved data which has the address
|
|
if( (TWCR & (1<<TWINT)) ){
|
|
state = 2;
|
|
TWDR = data;
|
|
TWCR = (1<<TWINT) | (1<<TWEN);
|
|
delay_counter = 10;
|
|
}
|
|
break;
|
|
case 2: // wait for ack/nack done and tbuffer empty, blind to success or fail
|
|
if( (TWCR & (1<<TWINT)) ){
|
|
state = 0;
|
|
}
|
|
break;
|
|
case 3: // wait for stop to clear
|
|
if( (TWCR & (1<<TWSTO)) == 0 ){
|
|
state = 0;
|
|
delay_counter = 10; // a little delay at the end of a sequence
|
|
}
|
|
break;
|
|
}
|
|
|
|
if( i2in != i2out ) return (state + 8);
|
|
else return state;
|
|
}
|
|
|
|
|
|
// WWVB receiver in a fringe area - integrate the signal to remove noise
|
|
// Although it probably makes more sense to dump the integrator 10 times per second, here we use 8.
|
|
// sample each millisecond, sum 100 or 150 samples , decide if low or high, shift into temp variable
|
|
// at end of 1 second( 8 bits), decide if temp has a 1, 0, or sync. Shift into 64 bit data and sync variables.
|
|
// when the sync variable contains the magic number, decode the 64 bit data.
|
|
// each second starts with a low signal and ends with a high signal
|
|
// much like software sampling rs232 start and stop bits.
|
|
// this routine runs fast by design until it locks on the wwvb signal( or slow depending upon point of view )
|
|
// if more than 30 seconds out of sync with the frame timer, then the time printed may be incorrect
|
|
// but that may take days and the time is only printed in debug mode
|
|
// this original version seems to work better in noise than the 2nd version
|
|
void wwvb_sample2(unsigned long t){
|
|
static unsigned long old_t;
|
|
int loops;
|
|
uint8_t b,s,e;
|
|
static uint8_t wwvb_clk, wwvb_sum, wwvb_tmp, wwvb_count; // data decoding
|
|
const uint8_t counts[8] = { 100,100,150,150,150,150,100,100 }; // total of 1000 ms
|
|
static uint8_t secs,errors,early,late;
|
|
static uint8_t dither = 4; // quick sync, adjusts to 1 when signal is good
|
|
char ch;
|
|
|
|
loops = t - old_t;
|
|
old_t = t;
|
|
|
|
while( loops-- ){ // repeat for any missed milliseconds
|
|
|
|
if( digitalRead(WWVB_OUT) == LOW ) ++wwvb_sum;
|
|
|
|
if( --wwvb_clk == 0 ){ // end of period, dump integrator
|
|
b = ( wwvb_sum > (counts[wwvb_count] >> 1) ) ? 0 : 128;
|
|
wwvb_tmp >>= 1;
|
|
wwvb_tmp |= b;
|
|
wwvb_sum = 0;
|
|
|
|
// 8 dumps of the integrator is one second, decode this bit ?
|
|
wwvb_count++;
|
|
wwvb_count &= 7;
|
|
wwvb_clk = counts[wwvb_count]; // 100 100 150 150 150 150 100 100
|
|
// decode 0 1 sync stop should be high
|
|
if( wwvb_count == 0 ){ // decode time
|
|
|
|
// clocks late or early, just dither them back and forth across the falling edge
|
|
// when not in sync, more 1's than 0's are detected and this slips in time.
|
|
if( wwvb_tmp != 0xff && wwvb_tmp != 0x00 ){
|
|
if( digitalRead(WWVB_OUT) == 0 ){
|
|
++late; // sampling late
|
|
wwvb_clk -= dither; // adjust sample to earlier
|
|
}
|
|
else{
|
|
++early; // need to sample later
|
|
wwvb_clk += dither; // longer clock
|
|
}
|
|
}
|
|
|
|
// decode
|
|
// 11111100 is a zero, 11110000 is a one, 11000000 is a sync
|
|
b = 0; s = 0; e = 1; // assume it is an error
|
|
|
|
// strict decode works well, added some loose decode for common bit errors
|
|
if( wwvb_tmp == 0xfc /*|| wwvb_tmp == 0xfd || wwvb_tmp == 0xfe*/ ) e = 0, b = 0;
|
|
if( wwvb_tmp == 0xf0 /*|| wwvb_tmp == 0xf1*/ ) e = 0, b = 1;
|
|
if( wwvb_tmp == 0xc0 /*|| wwvb_tmp == 0xc1*/ ) e = 0, s = 1;
|
|
|
|
gather_stats( wwvb_tmp , e ); // for serial logging display
|
|
|
|
if( e ) ch = '.';
|
|
else if( s ) ch = 'S';
|
|
else if( b == 0 ) ch = '0';
|
|
else if( b == 1 ) ch = '1';
|
|
ch = wwvb_trends(ch , wwvb_tmp);
|
|
|
|
// decode from trends
|
|
if( e ){
|
|
if( ch == 'o' ) b = 0, e = 0;
|
|
if( ch == 's' ) s = 1, e = 0;
|
|
if( ch == 'i' ) b = 1, e = 0;
|
|
}
|
|
if( e ) ++errors;
|
|
|
|
wwvb_data <<= 1; wwvb_data |= b; // shift 64 bits data
|
|
wwvb_sync <<= 1; wwvb_sync |= s; // sync
|
|
wwvb_errors <<= 1; wwvb_errors |= e; // errors
|
|
|
|
// magic 64 bits of sync ( looking at 60 seconds of data with 4 seconds of the past minute )
|
|
// xxxx1000000001 0000000001 0000000001 0000000001 0000000001 0000000001
|
|
// wwvb_sync &= 0x0fffffffffffffff; // mask off the old bits from previous minute
|
|
// instead of masking, use the old bits to see the double sync bits at 0 of this minute
|
|
// and 59 seconds of the previous minute. This decodes at zero time rather than some
|
|
// algorithms that decode at 1 second past.
|
|
if( wwvb_sync == 0b0001100000000100000000010000000001000000000100000000010000000001 ){
|
|
if( wwvb_errors == 0 ){ // decode if no bit errors
|
|
wwvb_decode();
|
|
}
|
|
}
|
|
|
|
if( ++secs >= 60 /* || tick */ ){ // adjust dither each minute
|
|
// tick = 0;
|
|
val_print = ' ';
|
|
frame_sync2( errors,frame_msec );
|
|
|
|
// running in print, wwvb decode, keep_time order or
|
|
// in wwvb decode, print, keep_time order this case needs a time update
|
|
if( time_flags & TS ) keep_time(); // need to increment the time since the last decode
|
|
|
|
// debug print out some stats when in test mode
|
|
if( wwvb_quiet == 1 ){
|
|
Serial.write(' ');
|
|
print_date_time();
|
|
Serial.write(' ');
|
|
if( frame_msec < 100 ) Serial.write(' ');
|
|
if( frame_msec < 10 ) Serial.write(' ');
|
|
Serial.print(frame_msec);
|
|
Serial.print(" Err "); Serial.print(errors); Serial.write(val_print);
|
|
Serial.print(" Clk "); Serial.print(early);
|
|
Serial.write(','); Serial.print(late);
|
|
print_stats(1,errors);
|
|
Serial.print(" FF "); Serial.print(FF);
|
|
Serial.write(' '); Serial.print(ff);
|
|
Serial.print(" Drift "); Serial.print((int)drift/100);
|
|
Serial.print(" CC "); Serial.print(tm_correct_count);
|
|
Serial.print(" Cal "); Serial.print(cal_result);
|
|
Serial.println();
|
|
}
|
|
else print_stats(0,errors);
|
|
|
|
time_flags = 0;
|
|
|
|
dither = ( errors >> 4 ) + 1;
|
|
early = late = secs = errors = 0; // reset the stats for the next minute
|
|
|
|
}
|
|
|
|
} // end decode time
|
|
} // end integration timer
|
|
} // loops - repeat for lost milliseconds if any
|
|
}
|
|
|
|
void print_date_time(){
|
|
|
|
if( gmon < 10 ) Serial.write('0');
|
|
Serial.print(gmon); Serial.write('/');
|
|
if( gday < 10 ) Serial.write('0');
|
|
Serial.print(gday); Serial.write('/');
|
|
if( gyr < 10 ) Serial.write('0');
|
|
Serial.print(gyr); Serial.write(' ');
|
|
|
|
if( ghr < 10 ) Serial.write('0');
|
|
Serial.print(ghr); Serial.write(':');
|
|
if( gmin < 10 ) Serial.write('0');
|
|
Serial.print(gmin);
|
|
|
|
if( time_flags & TP ) Serial.write('*');
|
|
else Serial.write(' ');
|
|
|
|
}
|
|
|
|
void gather_stats( uint8_t data, uint8_t err ){
|
|
uint8_t i;
|
|
|
|
if( err ) wwvb_last_err = data; // capture the last failed data bits for Serial log
|
|
|
|
for( i = 0; i < 8; ++i ){
|
|
if( data & 1 ) ++wwvb_stats[i];
|
|
data >>= 1;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
void print_stats(uint8_t prnt, int tot){
|
|
uint8_t i;
|
|
|
|
if( prnt ){ // ones and zeros distribution
|
|
Serial.print(" "); // when in sync with WWVB, will see a display such as 11XXxx00
|
|
|
|
if( tot > 3 || tot == 0 ){
|
|
for( i = 7; i < 8; --i ){
|
|
if( wwvb_stats[i] > 55 ) Serial.write('1');
|
|
else if( wwvb_stats[i] < 5 ) Serial.write('0');
|
|
else if( wwvb_stats[i] > 40 ) Serial.write('X');
|
|
else Serial.write('x');
|
|
}
|
|
}
|
|
else{
|
|
|
|
// print an error in binary, example failing data
|
|
for( i = 7; i < 8; --i ){
|
|
if( wwvb_last_err & 0x80 ) Serial.write('1');
|
|
else Serial.write('0');
|
|
wwvb_last_err <<= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
for( i = 0; i < 8; ++i ) wwvb_stats[i] = 0;
|
|
|
|
}
|
|
|
|
// adjust frame timing based upon undecoded wwvb statistics, locks to the falling edge of the
|
|
// wwvb signal.
|
|
void frame_sync2(int err, long tm){
|
|
int8_t t,i;
|
|
int loops;
|
|
int cnt;
|
|
|
|
if( err >= CLK_UPDATE_THRESHOLD2 ){
|
|
val_print = '^';
|
|
return;
|
|
}
|
|
|
|
tm = ( tm < 500 ) ? tm : tm - 1000 ;
|
|
cnt = CLK_UPDATE_THRESHOLD2 - err;
|
|
tm = last_time_average( tm, cnt );
|
|
if( tm >= 0 && tm < DEADBAND ) return;
|
|
if( tm < 0 && tm > -DEADBAND) return;
|
|
|
|
loops = tm/100;
|
|
if( loops < 0 ) loops = -loops;
|
|
++loops;
|
|
|
|
t = 0;
|
|
for( i = 0; i < loops; ++i ){ // run mult times for faster convergence
|
|
|
|
if( tm > 0 ) t = -1;
|
|
if( tm < 0 ) t = 1;
|
|
|
|
tm_correction2 += t;
|
|
clock_correction( t ); // long term clock drift correction
|
|
|
|
}
|
|
|
|
if( t == 1 ) val_print = '+';
|
|
if( t == -1) val_print = '-';
|
|
|
|
}
|
|
|
|
|
|
long last_time_average( long val, int count ){ // average values
|
|
|
|
static long run_ave; // weighted running average
|
|
int wt;
|
|
long rval;
|
|
|
|
val <<= 8; // scale up to keep a fractional part
|
|
|
|
wt = ( count > 64 ) ? 64 : count;
|
|
run_ave = ( 64 - wt ) * run_ave + wt * val;
|
|
run_ave >>= 6;
|
|
|
|
rval = run_ave >> 8;
|
|
if( rval > DEADBAND ) run_ave -= 256; // sub one ms when frame timing will be changed
|
|
if( rval < -DEADBAND ) run_ave += 256;
|
|
// Serial.print(rval); Serial.write(' ');
|
|
return rval;
|
|
|
|
}
|
|
|
|
/*************************** some old code with interesting algorithms ****************************
|
|
// sample the wwvb signal and detect bits, syncs, and errors
|
|
void wwvb_sample(unsigned long t){
|
|
static unsigned long old_t;
|
|
int loops;
|
|
static uint8_t bounce;
|
|
static uint8_t state;
|
|
static long ms;
|
|
static unsigned int low_counter;
|
|
static unsigned int high_counter;
|
|
static long ave_time;
|
|
static long ave_count;
|
|
uint8_t b,s,e;
|
|
int adj;
|
|
// int clock_adj_sum;
|
|
static uint64_t wwvb_data, wwvb_sync, wwvb_errors; // defeat this algorithm by not using the globals
|
|
|
|
loops = t - old_t;
|
|
old_t = t;
|
|
|
|
while( loops-- ){ // repeat for any missed milliseconds
|
|
|
|
bounce <<= 1;
|
|
if( digitalRead(WWVB_OUT) == HIGH ) bounce |= 1; // debounce, looking for zero or 255 value
|
|
++ms;
|
|
|
|
switch(state){
|
|
case 0: // looking for a low signal
|
|
++high_counter;
|
|
|
|
if( bounce == 0 ){ // found the low, decode the bit for the previous second
|
|
state = 1;
|
|
b = s = e = 0;
|
|
high_counter += low_counter; // get total frame ms
|
|
if( high_counter < 800 || high_counter > 1200 ) e = 1; // too short or too long
|
|
|
|
if( low_counter > 100 && low_counter < 300 ) b = 0; // decode the bit
|
|
else if( low_counter > 400 && low_counter < 600 ) b = 1;
|
|
else if( low_counter > 700 && low_counter < 900 ) s = 1;
|
|
else e = 1; // no valid decode
|
|
|
|
low_counter = 0;
|
|
|
|
wwvb_data <<= 1; wwvb_data |= b; // shift 64 bits data
|
|
wwvb_sync <<= 1; wwvb_sync |= s; // sync
|
|
wwvb_errors <<= 1; wwvb_errors |= e; // errors
|
|
|
|
// magic 64 bits of sync ( looking at 60 seconds of data with 4 seconds of the past minute )
|
|
// xxxx1000000001 0000000001 0000000001 0000000001 0000000001 0000000001
|
|
// use the old bits to see the double sync bits at 0 of this minute
|
|
// and 59 seconds of the previous minute. This decodes at zero time rather than some
|
|
// algorithms that decode at 1 second past.
|
|
if( wwvb_sync == 0b0001100000000100000000010000000001000000000100000000010000000001 ){
|
|
if( wwvb_errors == 0 ){ // decode if no bit errors
|
|
// wwvb_decode(); // not used if commented
|
|
}
|
|
}
|
|
|
|
// gather some stats for printing
|
|
if( e == 0 ){
|
|
ave_time += frame_msec;
|
|
if( frame_msec >= 500 ) ave_time -= 1000; // 500-999 averaged in as -(1000-frame_msec)
|
|
++ave_count; // implemented as +frame_msec - 1000
|
|
}
|
|
}
|
|
break;
|
|
case 1: // looking for a high signal
|
|
++low_counter;
|
|
if( bounce == 255 ){
|
|
state = 0;
|
|
high_counter = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if( ms >= 60000 ){ // print out some stats if in printing mode
|
|
|
|
if( ave_count ){
|
|
ave_time = ave_time/ave_count;
|
|
if( ave_time < 0 ) ave_time += 1000;
|
|
}
|
|
|
|
val_print = ' ';
|
|
adj = frame_sync( 60-ave_count, ave_time ); // sync our seconds to wwvb falling edge signal
|
|
|
|
// debug print out some stats when in test mode
|
|
if( wwvb_quiet == 1 && val_print == '*'){
|
|
//clock_adj_sum = clock_freq - START_CLOCK_FREQ;
|
|
Serial.print("Tm ");
|
|
if( ave_time < 100 ) Serial.write(' ');
|
|
if( ave_time < 10 ) Serial.write(' ');
|
|
Serial.print(ave_time);
|
|
Serial.print(" Ave");
|
|
if( adj >= 0 ) Serial.write(' ');
|
|
if( abs(adj) < 100 ) Serial.write(' ');
|
|
if( abs(adj) < 10 ) Serial.write(' ');
|
|
Serial.print(adj);
|
|
Serial.print(" Valid ");
|
|
if( ave_count < 10 ) Serial.write(' ');
|
|
Serial.print(ave_count);
|
|
Serial.write(val_print);
|
|
Serial.print(" FF "); Serial.print(ff);
|
|
Serial.write(' '); Serial.print(hourFF);
|
|
Serial.write(','); Serial.print(dayFF);
|
|
Serial.print(" Drift "); Serial.print((int)drift/100);
|
|
Serial.print(" CC "); Serial.print(tm_correct_count);
|
|
Serial.print(" Cal Freq "); Serial.print(cal_result);
|
|
Serial.println();
|
|
}
|
|
// reset the stats for the next minute
|
|
ms = ave_count = ave_time = 0;
|
|
}
|
|
|
|
} // loops - repeat for lost milliseconds if any
|
|
}
|
|
|
|
|
|
long median( long val ){ // return the median of 3 values
|
|
int i,j,k;
|
|
static long vals[3];
|
|
static int in;
|
|
|
|
// first time
|
|
if( vals[0] == 0 ){
|
|
vals[0] = vals[1] = vals[2] = val;
|
|
return val;
|
|
}
|
|
|
|
vals[in++] = val;
|
|
if( in > 2 ) in = 0;
|
|
|
|
i = 0, j = 1, k = 2; // assume in correct order low to high
|
|
if( vals[i] > vals[k] ) i = 2, k = 0; // swap low and high
|
|
if( vals[j] < vals[i] ) j = i; // mid val >= low val
|
|
if( vals[j] > vals[k] ) j = k; // mid val <= high val
|
|
|
|
//Serial.print( vals[0] ); Serial.write(' ');
|
|
//Serial.print( vals[1] ); Serial.write(' ');
|
|
//Serial.print( vals[2] ); Serial.write(' ');
|
|
|
|
return vals[j];
|
|
}
|
|
|
|
|
|
// adjust frame timing based upon undecoded wwvb statistics, locks to the falling edge of the
|
|
// wwvb signal.
|
|
int frame_sync(int err, long tm){
|
|
int8_t t,i;
|
|
static int last_time_error;
|
|
//static int last_error_count = 60; // made global for printing
|
|
int loops;
|
|
int cnt;
|
|
int temp;
|
|
|
|
if( tm > 980 || tm < 20 ) tm = 0; // deadband for clock corrections
|
|
cnt = 60 - err;
|
|
loops = last_time_error/100; // loop 1,2,3,4 or 5 times for error <100, <200, <300, <400, <500
|
|
if( loops < 0 ) loops = -loops;
|
|
++loops;
|
|
|
|
if( last_error_count <= CLK_UPDATE_THRESHOLD ) ++last_error_count; // relax the test threshold
|
|
|
|
// average the values for large error counts
|
|
temp = ( tm < 500 ) ? tm : tm - 1000 ;
|
|
temp = last_time_average( temp, cnt );
|
|
|
|
for( i = 0; i < loops; ++i ){ // run mult times for faster correction convergence
|
|
|
|
t = 0; // signal better than the relaxing threshold ?
|
|
|
|
if( err < last_error_count ){
|
|
t = ( tm < 500 ) ? -1 : 1 ;
|
|
if( tm == 0 ) t = 0;
|
|
last_time_error = temp + t;
|
|
//if( cnt < 3 ) last_time_error >>= 3; // small valid signals, limit time delta allowed
|
|
last_time_error = constrain(last_time_error,-5*cnt,5*cnt); // limit change for larger errors count
|
|
last_error_count = err; // new threshold
|
|
val_print = '*';
|
|
}
|
|
|
|
if( t == 0 ){ // use old data for the correction amount
|
|
if( last_time_error > 0 ) last_time_error--, t = -1;
|
|
if( last_time_error < 0 ) last_time_error++, t = 1;
|
|
}
|
|
|
|
tm_correction2 += t;
|
|
clock_correction( t ); // long term clock drift correction
|
|
|
|
err = 60; // use last_time info for the 2nd pass in the loop
|
|
}
|
|
|
|
//return -(last_time_error); // return value for printing
|
|
return temp;
|
|
}
|
|
|
|
|
|
|
|
void clock_correction( int8_t val ){ // long term frequency correction to time fudge factor FF
|
|
static int8_t time_trend; // a change of +-100 is 1hz change
|
|
uint8_t changed; // correct for seasonal temperature variations to clocks
|
|
// using the WWVB time to arduino time errors
|
|
if( wspr_tx_enable ) return; // ignore this when transmitting
|
|
|
|
time_trend -= val; // or should it be += val;
|
|
|
|
changed = 0;
|
|
if( time_trend >= CLK_UPDATE_MIN ) clock_freq += CLK_UPDATE_AMT, changed = 1;
|
|
if( time_trend <= -CLK_UPDATE_MIN ) clock_freq -= CLK_UPDATE_AMT, changed = 1;
|
|
|
|
if( changed ){ // set new dividers for the new master clock freq value to take effect
|
|
time_trend = 0;
|
|
if( clock_freq > 2700486600ULL ) clock_freq -= 100; // stay within some bounds, +- 400
|
|
if( clock_freq < 2700406600ULL ) clock_freq += 100; // +- 100 at 7mhz
|
|
si_pll_x(PLLB,cal_freq,cal_divider,0); // calibrate frequency on clock 2
|
|
si_pll_x(PLLA,Rdiv*4*freq,divider,0); // receiver 4x clock
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
**************************************************************************************************/
|