kopia lustrzana https://github.com/Hamlib/Hamlib
452 wiersze
9.1 KiB
C
452 wiersze
9.1 KiB
C
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <assert.h>
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#include "peekpoke.h"
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#include "ep93xx_adc.h"
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#define DATA_PAGE 0x12C00000
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#define CALIB_LOC 2027 //location of calibration values
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#define NUM_SAMPLES 5
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#define NUM_CHANNELS 4
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/* globals */
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static unsigned long adc_page, syscon_page;
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char *dr_page;
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double el,az;
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/*Calculate the adc value corresponding to 0V*/
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//val1 is the ADC val coresponding to 0.833V
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//val2 is the ADC val corresponging to 2.5V
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int calcZeroVal(int val1, int val2)
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{
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val2 += 0x10000;
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return (int)(val1-(((val2-val1)/(2.5-0.833))*0.833));
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}
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//return value of 1 indicates the board has no calibration values
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//return value of 0 indicates the board has calibration values
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int read_calibration(int buf[NUM_CHANNELS][2])
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{
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int i,j,k = 0;
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unsigned short cal[NUM_CHANNELS*2];
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// read 16 calibration bytes into buffer
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FILE *f = fopen("/etc/ADC-calibration.dat","r");
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if (!f) goto empty_calibration;
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printf("Non-virgin board detected, evaluating stored "
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"calibration values\n");
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printf("Stored Calibration values [");
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if (fread(cal,NUM_CHANNELS*4,1,f) == 1)
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{
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for(j=0;j<2;j++)
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for(i=0;i<NUM_CHANNELS;i++)
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{
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printf("0x%x", cal[k]);
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buf[i][j] = cal[k];
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k++;
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if(k < NUM_CHANNELS*2)
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printf(", ");
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}
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printf("]\n");
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return 1;
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}
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empty_calibration:
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printf("/etc/ADC-calibration.dat not found or it's not readable\n");
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return 0;
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}
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void write_calibration(int cal[NUM_CHANNELS][2])
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{
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unsigned short buf[16];
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int i,j,k=0;
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FILE *f = fopen("/etc/ADC-calibration.dat","w");
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//Convert 32 bit vals to 16 bit vals
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for(j=0;j<2;j++)
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for(i=0;i<NUM_CHANNELS;i++)
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{
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buf[k] = (unsigned short)cal[i][j];
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k++;
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}
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if (!f) goto unwrite_calibration;
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if (fwrite(buf,NUM_CHANNELS*4,1,f) == 1) return;
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unwrite_calibration:
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printf("Problem writing /etc/ADC-calibration.dat: %m\n");
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}
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static void erase_calibration()
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{
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printf("Erasing calibration values...\n");
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unlink("/etc/ADC-calibration.dat");
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}
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int check_calibration(int cal[NUM_CHANNELS][2],
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int stored_cal[NUM_CHANNELS][2], int state)
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{
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double pcnt_diff;
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int i,j,erase_cal =0;
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int failure = 0;
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if(state == 0) //no calibration values
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{
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printf("Virgin board detected...\n");
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for(j=0;j<2;j++)
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{
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for(i=0;i<NUM_CHANNELS;i++)
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{
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if(j == 0)
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pcnt_diff = (((double)abs(0xa000 -
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cal[i][j])) / 0xa000) * 100;
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else
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pcnt_diff = (((double)abs(0x3300 -
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cal[i][j])) / 0x3300) * 100;
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if(pcnt_diff > 10)
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{
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printf("Calculated calibration "
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"values out of range...\n");
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exit(-1);
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}
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}
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}
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write_calibration(cal);
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} else //calibration values read
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{
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for(j=0;j<2;j++)
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{
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for(i=0;i<NUM_CHANNELS;i++)
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{
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pcnt_diff = (((double)abs(stored_cal[i][j] -
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cal[i][j])) / stored_cal[i][j])
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* 100;
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if(pcnt_diff > 0.25)
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{
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if(!failure)
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{
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printf("Calibration values out"
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"of range\n");
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failure = 1;
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erase_cal = 1;
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}
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printf("\tChannel %d: %3.3f%%\n",i
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, pcnt_diff);
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}
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}
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}
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}
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if(erase_cal) erase_calibration();
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if(failure) return 0;
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return 1;
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}
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void setDR(char *x,int n,int val)
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{
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if (n < 0 || n > 8)
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return;
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x[0] = (x[0] & ~(1 << n)) | (val ? (1<<n) : 0);
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}
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void setD(char *x,int n,int val)
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{
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if (n < 0 || n > 8)
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return;
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x[2] = (x[2] & ~(1 << n)) | (val ? (1<<n) : 0);
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}
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double get_volts(int val, int zero, int range)
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{
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if(val <= 0x7000)
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val = val + 0x10000;
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val = val - zero;
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return ((double)val * 3.3) / range;
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}
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void calc_calibration(int calibration[NUM_CHANNELS][2],
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int adc_result_1[NUM_CHANNELS][NUM_SAMPLES],
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int adc_result_2[NUM_CHANNELS][NUM_SAMPLES])
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{
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int i, j;
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/* zero out our calibration values */
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for(i = 0; i < NUM_CHANNELS; i++)
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for(j = 0; j < 2; j++)
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calibration[i][j] = 0;
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//convert 0.833V vals to 0V vals
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for(i=0;i<NUM_CHANNELS;i++)
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{
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for(j=0;j<NUM_SAMPLES;j++)
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{
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if(i % 2)//odd channels
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adc_result_1[i][j] =
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calcZeroVal(adc_result_1[i][j],
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adc_result_1[0][j]);
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else
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adc_result_2[i][j] =
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calcZeroVal(adc_result_2[i][j],
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adc_result_2[1][j]);
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}
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}
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//sum the readings
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for(i = 0; i < NUM_CHANNELS; i++)
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{
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for(j = 0; j < NUM_SAMPLES; j++ )
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{
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if(i % 2 == 0 )
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{
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//0.833 volt values
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calibration[i][0] = adc_result_2[i][j]
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+ calibration[i][0];
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//2.5 volt values
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calibration[i][1] = adc_result_1[i][j]
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+ calibration[i][1];
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} else
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{
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//0.833 volt values
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calibration[i][0] = adc_result_1[i][j]
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+ calibration[i][0];
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//2.5 volt values
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calibration[i][1] = adc_result_2[i][j]
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+ calibration[i][1];
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}
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}
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}
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//printf("Calculated Calibration values [");
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for(j = 0; j < 2; j++)
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{
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for(i = 0; i < NUM_CHANNELS; i++)
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{
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calibration[i][j] = (calibration[i][j] / NUM_SAMPLES);
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//printf("0x%x", calibration[i][j]);
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//if((i == NUM_CHANNELS-1) && (j == 1))
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//printf("]\n");
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//else
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//printf(", ");
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}
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}
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}
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/************************************************************************
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*DESCRIPTION: Read the EP93xx onboard ADC. Discard the first
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*two samples then save the next NUM_SAMPLES.
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***********************************************************************/
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static void read_7xxx_adc(int adc_result[NUM_CHANNELS][NUM_SAMPLES])
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{
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int i, j, cur_ch;
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for(i = 0; i < NUM_CHANNELS; i++)
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{
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switch(i)
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{
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case 0:
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cur_ch = ADC_CH0;
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break;
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case 1:
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cur_ch = ADC_CH1;
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break;
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case 2:
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cur_ch = ADC_CH2;
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break;
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case 3:
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cur_ch = ADC_CH3;
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break;
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case 4:
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cur_ch = ADC_CH4;
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break;
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}
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//discard first two samples
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read_channel(adc_page, cur_ch);
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read_channel(adc_page, cur_ch);
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//read more samples
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for(j = 0; j < NUM_SAMPLES; j++)
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{
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usleep(10000);
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adc_result[i][j] = read_channel(adc_page, cur_ch);
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}
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}
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}
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int test_ADC(int calibration[NUM_CHANNELS][2])
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{
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int adc_result_1[NUM_CHANNELS][NUM_SAMPLES];
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int adc_result_2[NUM_CHANNELS][NUM_SAMPLES];
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int i, j, return_val;
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int failure = 0;
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//double voltage,el,az;
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double voltage;
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setD(dr_page, 0, 1); //ADC1 = ADC3 = 0.833V
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setD(dr_page, 2, 1); //ADC0 = ADC2 = 2.5V
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read_7xxx_adc(adc_result_1);
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setD(dr_page, 0, 0); //ADC1 = ADC3 = 2.5V
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setD(dr_page, 2, 1); //ADC0 = ADC2 = 0.833V
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read_7xxx_adc(adc_result_2);
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el = get_volts(adc_result_1[0][0], 0x9E58, 0xC350);
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az = get_volts(adc_result_1[1][0], 0x9E58, 0xC350);
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el = (el/3.3) * 180;
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az = (az/3.3) * 360;
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//printf("\t El.: %3.1f Az.: %3.1f \n", el, az);
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//verify results are within range
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for(i=0;i<NUM_CHANNELS;i++)
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{
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for(j=0;j<NUM_SAMPLES;j++)
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{
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//use the datasheet values
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voltage = get_volts(adc_result_1[i][j], 0x9E58, 0xC350);
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//printf("\tChannel %d: %3.1f \n", i, voltage);
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//even channels 2.5V(+-150mV)
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if(i % 2 == 0 &&
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(voltage < 2.35 || voltage > 2.65))
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{
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if(!failure)
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{
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failure = 1;
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//printf("EP93XX ADC out of range\n");
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}
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//printf("\tChannel %d: %3.3fV"
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//"(expected 2.5V +- 150mV)\n", i, voltage);
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//odd channels 0.833(+-50mV)
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}
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else if(i % 2 == 1 &&
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(voltage < 0.333 || voltage > 1.333))
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{
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if(!failure)
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{
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failure = 1;
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//printf( "EP93xx ADC out of range\n");
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}
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//printf("\tChannel %d: %3.3fV"
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// "(expected 0.833V +- 50mV)\n", i, voltage);
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}
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//use the datasheet values
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voltage = get_volts(adc_result_2[i][j], 0x9E58, 0xC350);
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//odd channels 2.5V(+-150mV)
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if(i % 2 == 1 &&
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(voltage < 2.35 || voltage > 2.65))
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{
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if(!failure)
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{
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failure = 1;
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//printf("EP93XX ADC out of range\n");
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}
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//printf("\tChannel %d: %3.3fV"
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//"(expected 2.5V +- 150mV)\n", i, voltage);
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//even channels 0.833(+-50mV)
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}
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else if(i % 2 == 0 &&
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(voltage < 0.333 || voltage > 1.333))
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{
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if(!failure)
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{
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failure = 1;
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//printf( "EP93xx ADC out of range\n");
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}
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///printf("\tChannel %d: %3.3fV" "(expected 0.833V +- 50mV)\n", i, voltage);
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}
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}
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}
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calc_calibration(calibration, adc_result_1, adc_result_2);
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if(failure)
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return_val = 0;
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else return_val = 1;
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return return_val;
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}
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int main(void)
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{
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int calibration[NUM_CHANNELS][2];
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int stored_calibration[NUM_CHANNELS][2];
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int ret_val, state;
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int devmem = open("/dev/mem", O_RDWR|O_SYNC);
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assert(devmem != -1);
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dr_page = mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
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MAP_SHARED, devmem, DATA_PAGE);
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assert(&dr_page != MAP_FAILED);
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adc_page = (unsigned long)mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
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MAP_SHARED, devmem, ADC_PAGE);
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assert(&adc_page != MAP_FAILED);
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syscon_page = (unsigned long)mmap(0, getpagesize(), PROT_READ|PROT_WRITE
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, MAP_SHARED, devmem, SYSCON_PAGE);
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assert(&syscon_page != MAP_FAILED);
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init_ADC(adc_page, syscon_page);
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setDR(dr_page, 0, 1);
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setDR(dr_page, 1, 0);
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setDR(dr_page, 2, 1);
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setDR(dr_page, 3, 0);
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if(test_ADC(calibration))
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{
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printf("ADC tested ok(data sheet values)\n");
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state = read_calibration(stored_calibration);
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if(check_calibration(calibration, stored_calibration, state))
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ret_val = 0;
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else
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ret_val = 1;
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}
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else
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ret_val = 1;
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printf("\t El.: %3.1f Az.: %3.1f \n", el, az);
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close(devmem);
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return ret_val;
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}
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