kopia lustrzana https://github.com/bristol-seds/pico-tracker
Various aprs tidy / fix. Added useful resources list. Added telemetry terminate at end of packet
Richard Meadows
rodzic
5a5772499c
commit
0e14825de9
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@ -5,7 +5,6 @@
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|*GLCK*|
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||gclk0|main clock, internal osc8m|4 MHz
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||gclk1|tcxo clock, fed from xosc OR osc8m
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||gclk7|aprs clock, fed from gclk1, div 6 / 11
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|*TC*||
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@ -26,6 +26,6 @@
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#define APRS_H
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void aprs_init(void);
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void aprs_tick(void);
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uint8_t aprs_tick(void);
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#endif /* APRS_H */
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@ -33,6 +33,12 @@
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#define AX25_MARK_FREQ 1200
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#define AX25_SPACE_FREQ 2200
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/**
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* GCLK division factors
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*/
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#define AX25_DIVISION_MARK 11
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#define AX25_DIVISION_SPACE 6
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/**
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* How often our handler gets called
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*/
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@ -51,11 +57,12 @@
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*/
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#define AX25_CONTROL_WORD 0x03 /* Use Unnumbered Information (UI) frames */
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#define AX25_PROTOCOL_ID 0xF0 /* No third level protocol */
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#define AX25_HDLC_FLAG 0x7E
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enum ax25_symbol_t {
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AX25_MARK,
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AX25_SPACE,
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AX25_NONE,
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};
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struct ax25_byte_t {
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uint8_t val;
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@ -28,6 +28,14 @@
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#include "samd20.h"
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#include "ax25.h"
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/**
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* USEFUL RESOURCES
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* =============================================================================
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*
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* http://www.aprs.org/doc/APRS101.PDF
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* http://k9dci.home.comcast.net/~k9dci/APRS%20Beginner%20Guide%20-%20K9DCI%20Ver%205-1.pdf
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*/
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char addresses[50];
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void aprs_start(void)
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@ -40,7 +48,7 @@ void aprs_start(void)
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ax25_start(addresses, 21, "testtest", 8);
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}
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void aprs_tick(void)
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uint8_t aprs_tick(void)
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{
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ax25_tick();
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return ax25_tick();
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}
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@ -23,6 +23,7 @@
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*/
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#include <string.h>
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#include <math.h>
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#include "samd20.h"
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#include "system/gclk.h"
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@ -46,6 +47,19 @@ uint32_t ax25_index, ax25_frame_length;
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void ax25_gpio1_pwm_init(void);
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/**
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* USEFUL RESOURCES
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* =============================================================================
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*
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* http://en.wikipedia.org/wiki/AX.25
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* https://www.tapr.org/pub_ax25.html#2.4.1.2
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* http://owenduffy.net/blog/?p=2101
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* http://n1vg.net/packet/
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*/
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/**
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* Frame Check Sequence (FCS)
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* =============================================================================
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@ -89,7 +103,7 @@ uint16_t crc_fcs(uint8_t *string, uint32_t length)
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void ax25_start(char* addresses, uint32_t addresses_len,
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char* information, uint32_t information_len)
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{
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uint32_t i, j;
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uint32_t i;
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uint16_t fcs;
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/* Process addresses */
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@ -140,7 +154,9 @@ void ax25_gpio1_pwm_init(void)
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{
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float gclk1_frequency = (float)system_gclk_gen_get_hz(1);
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uint32_t top = 38;//(uint32_t)(gclk1_frequency / 13200.0*4);// & ~0x1;
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float divide_needed = round(gclk1_frequency / (13200*4));
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uint32_t top = (uint32_t)divide_needed & ~0x1;
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uint32_t capture = top >> 1; /* 50% duty cycle */
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if (top > 0xFF) while (1); // It's only an 8-bit counter
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@ -149,7 +165,7 @@ void ax25_gpio1_pwm_init(void)
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system_gclk_gen_set_config(GCLK_GENERATOR_7,
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GCLK_SOURCE_GCLKGEN1, /* Source */
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false, /* High When Disabled */
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11, /* Division Factor */// TODO
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AX25_DIVISION_MARK,/* Division Factor */
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false, /* Run in standby */
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false); /* Output Pin Enable */
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system_gclk_gen_enable(GCLK_GENERATOR_7);
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@ -189,14 +205,13 @@ void ax25_gpio1_pwm_init(void)
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/**
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* Returns the next byte to transmit
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*/
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struct ax25_byte_t ax25_get_next_byte(void) {
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/* Return HLDC flag by default */
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struct ax25_byte_t next = { .val = 0x7E, .stuff = 0 };
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uint8_t ax25_get_next_byte(struct ax25_byte_t* next) {
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switch (ax25_state) {
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case AX25_PREAMBLE: /* Preamble */
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/* Return flag by default*/
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/* Return flag */
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next->val = AX25_HDLC_FLAG;
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next->stuff = 0;
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/* Check for next state */
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ax25_index++;
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@ -210,8 +225,8 @@ struct ax25_byte_t ax25_get_next_byte(void) {
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case AX25_FRAME: /* Frame */
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/* Return data */
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next.val = ax25_frame[ax25_index];
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next.stuff = 1;
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next->val = ax25_frame[ax25_index];
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next->stuff = 1;
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/* Check for next state */
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ax25_index++;
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@ -224,7 +239,9 @@ struct ax25_byte_t ax25_get_next_byte(void) {
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case AX25_POSTAMBLE: /* Postamble */
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/* Return flag by default */
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/* Return flag */
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next->val = AX25_HDLC_FLAG;
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next->stuff = 0;
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/* Check for next state */
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ax25_index++;
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@ -237,29 +254,31 @@ struct ax25_byte_t ax25_get_next_byte(void) {
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default:
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break;
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return 0;
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}
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return next;
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return 1;
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}
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/**
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* Returns the next symbol to transmit
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*/
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enum ax25_symbol_t ax25_get_next_symbol(void) {
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uint8_t bit;
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enum ax25_symbol_t ax25_get_next_symbol(void)
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{
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/* Get next byte if we need to */
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if (bit_index >= 8) {
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current_byte = ax25_get_next_byte();
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/* Attempt to get the next byte */
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if (!ax25_get_next_byte(¤t_byte)) {
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return AX25_NONE; /* We're done */
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}
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bit_index = 0;
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}
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/* transmit bits lsb first */
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bit = current_byte.val & 0x01;
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if (bit) { /* One */
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if (current_byte.val & 0x01) { /* One */
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one_count++;
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@ -293,30 +312,28 @@ enum ax25_symbol_t ax25_get_next_symbol(void) {
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*/
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uint8_t ax25_tick(void)
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{
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if (next_symbol == AX25_NONE) {
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return 0; /* We're done */
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}
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if (next_symbol == AX25_SPACE) {
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/* Space */
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system_gclk_gen_set_config(GCLK_GENERATOR_7,
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GCLK_SOURCE_GCLKGEN1, /* Source */
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false, /* High When Disabled */
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6, /* Division Factor */// TODO
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AX25_DIVISION_SPACE, /* Division Factor */
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false, /* Run in standby */
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false); /* Output Pin Enable */
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} else {
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/* Mark */
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system_gclk_gen_set_config(GCLK_GENERATOR_7,
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GCLK_SOURCE_GCLKGEN1, /* Source */
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false, /* High When Disabled */
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11, /* Division Factor */// TODO
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AX25_DIVISION_MARK, /* Division Factor */
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false, /* Run in standby */
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false); /* Output Pin Enable */
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}
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next_symbol = ax25_get_next_symbol();
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return 1;
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}
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@ -323,10 +323,14 @@ int main(void)
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led_on();
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telemetry_start(TELEMETRY_APRS, 0xFFFF);
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while (1) {
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system_sleep();
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telemetry_start(TELEMETRY_APRS, 0xFFFF);
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while (telemetry_active()) {
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system_sleep();
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}
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for (int i = 0; i < 1000*1000; i++);
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}
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@ -310,10 +310,15 @@ void telemetry_tick(void) {
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/* APRS: We use pwm to control gpio1 */
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aprs_start();
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si_trx_on(SI_MODEM_MOD_TYPE_2GFSK, 200);
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si_trx_on(SI_MODEM_MOD_TYPE_2GFSK, 400);
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radio_on = 1;
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}
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aprs_tick();
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if (!aprs_tick()) {
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/* Transmission Finished */
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telemetry_stop();
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if (is_telemetry_finished()) return;
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}
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break;
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