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@ -3,21 +3,14 @@
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#include "muxer.h"
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#include "i2c_simple.h"
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#include "mcp_adc.h"
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#include "debug.h"
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#include "math.h"
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uint8_t foo;
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uint16_t bar;
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uint16_t timertmp;
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uint16_t temperatures[4];
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int32_t temp_avg_cumul;
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int16_t temp_avg_count;
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void baz() {
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foo++;
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}
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uint8_t sensor_active[4];
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int32_t temp_avg_cumul[4];
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int16_t temp_avg_count[4];
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/* pinout
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* - i2c:
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@ -26,6 +19,8 @@ void baz() {
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* - multiplexer:
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* C3: inhibit
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* C0-C2: muxer select
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* - offset measurement
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* D0-D3 offset compensation
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*
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*
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* amp 0 is on muxer channel 2
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@ -36,9 +31,66 @@ void baz() {
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#define MUXER_CHANNEL_2 1
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#define MUXER_CHANNEL_3 3
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void hardinit() {
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/* initializes the hardware */
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int32_t avg_temp(int16_t val, uint8_t channel) {
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int32_t temp = temp_avg_cumul[channel];
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temp /= temp_avg_count[channel];
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temp_avg_count[channel] = 0;
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temp_avg_cumul[channel] = 0;
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return (temp * 625); // nV
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}
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uint16_t calc_temp(int16_t val, uint8_t channel) {
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float mV = ((float) avg_temp(val, channel))/1000000;
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uint16_t temp;
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if(mV < 0) {
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/* t in mV
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E = sum(i=0 to n) c_i t^i. ; n=10
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*/
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float coef[] = {
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0.000000000000E+00,
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0.394501280250E-01,
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0.236223735980E-04,
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-0.328589067840E-06,
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-0.499048287770E-08,
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-0.675090591730E-10,
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-0.574103274280E-12,
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-0.310888728940E-14,
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-0.104516093650E-16,
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-0.198892668780E-19,
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-0.163226974860E-22
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};
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for(int i=0; i<11; i++) {
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temp += coef[i] * pow(mV, i+1);
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}
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return temp;
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} else {
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/*
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t in mV
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E = sum(i=0 to n) c_i t^i + a0 exp(a1 (t - a2)^2). ; n = 9
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*/
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float coef[] = {
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-0.176004136860E-01,
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0.389212049750E-01,
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0.185587700320E-04,
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-0.994575928740E-07,
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0.318409457190E-09,
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-0.560728448890E-12,
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0.560750590590E-15,
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-0.320207200030E-18,
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0.971511471520E-22,
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-0.121047212750E-25
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};
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float a[] = {0.118597600000E+00, -0.118343200000E-03, 0.126968600000E+03};
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for(int i=0; i<10; i++) {
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temp += coef[i]*pow(mV, i+1) + a[0] * pow(exp(a[1]*(mV - a[2])), 2);
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}
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}
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}
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/* initializes the hardware */
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void hardinit() {
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// enable softtimer isr
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TCCR1A = _BV(WGM10);
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TCCR1B = _BV(WGM12) | _BV(CS11); // clk/8 prescaler, 4kHz PWM-freq.
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@ -47,6 +99,7 @@ void hardinit() {
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spi_init();
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muxer_init();
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offset_measure_init();
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i2c_init();
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@ -54,53 +107,58 @@ void hardinit() {
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}
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void softinit() {
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//test values
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foo = 0x87;
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bar= 0xfafa;
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mcpadc_init(ADC_GAIN_2|ADC_CONV_CONT|ADC_BITS_16);
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}
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int __attribute__((noreturn)) main(void) {
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temperatures[2]=1;
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hardinit();
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temperatures[2]=10;
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softinit();
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muxer_set(MUXER_CHANNEL_0);
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temperatures[2]=0;
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dbgLog("Hallo, Welt!\n");
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for(;;){
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SOFTTIMER(1,10) {
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if(mcpadc_has_new_data()) {
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temperatures[0] = mcpadc_get_data();
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temperatures[2]++;
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int16_t temp = temperatures[0];
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temp_avg_cumul += temp;
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temp_avg_count += 1;
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}
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temperatures[1] = 22;
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for(int i=0; i<4; i++) {
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if(sensor_active[i] && mcpadc_has_new_data(i)) {
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temperatures[i] = calc_temp( mcpadc_get_data(i), i );
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temp_avg_cumul[i] += temperatures[i];
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temp_avg_count[i] += 1;
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}
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}
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}
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SOFTTIMER(2,500){
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int32_t temp = temp_avg_cumul;
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temp /= temp_avg_count;
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temp_avg_count = 0; temp_avg_cumul = 0;
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int32_t nV = (temp * 625);
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int32_t mK = nV/39;
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for(int i=0; i<4; i++) {
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if(sensor_active[i]) {
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int32_t temp = temp_avg_cumul[i];
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temp /= temp_avg_count[i];
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temp_avg_count[i] = 0; temp_avg_cumul[i] = 0;
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int32_t nV = (temp * 625);
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int32_t mK = nV/39;
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dbgLog("temp-%i: %6li (%li µV, %li mK)\n",i,temp,nV/1000, mK);
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}
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}
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}
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dbgLog("temp: %6li (%li µV, %li mK)\n",temp,nV/1000, mK);
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SOFTTIMER(3,4000){
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static uint8_t toggle;
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if(toggle){
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offset_measure_start(0);
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toggle=0;
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dbgLog("measuring offset\n");
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} else {
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offset_measure_stop();
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toggle=1;
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dbgLog("stopping offset-measuring\n");
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}
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}
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}
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}
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ISR(TIMER1_OVF_vect,ISR_NOBLOCK){
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timertmp=timer1_acc;
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timertmp++;
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Paul Goeser
15 years ago