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139 lines
3.3 KiB
139 lines
3.3 KiB
#include "main.h"
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#include "spi.h"
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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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#include "filter.h"
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#include <util/delay.h>
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uint16_t timertmp;
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uint16_t temperatures[4];
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/* pinout
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* - i2c:
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* C5
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* C4
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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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*/
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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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TIMSK1 |= _BV(TOIE1);
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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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sei();
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}
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void softinit() {
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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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hardinit();
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softinit();
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muxer_set(1);
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int16_t data;
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for(;;){
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_delay_ms(4000);
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dbgLog("loop iteration\n");
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// measure temps 5*2 times
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for(uint8_t i=0; i<5; i++) {
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// dbgLog("starting temp measuring\n");
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for(uint8_t active_sensor=0; active_sensor<2; active_sensor++) { // only measuring two probes atm
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muxer_set(active_sensor);
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while(!mcpadc_has_new_data()) _delay_ms(10);
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mcpadc_get_data(); // first data after switch to trash
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while(!mcpadc_has_new_data()) _delay_ms(10);
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data = mcpadc_get_data();
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process_thermocouple_value(data,active_sensor);
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_delay_ms(1000);
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}
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dbgLog("a");
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}
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// dbgLog("now measuring offsets\n");
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// measure 2 offsets
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for(uint8_t active_sensor=0; active_sensor<2; active_sensor++) { // only measuring two offsets atm
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// dbgLog("active sensor: %i",active_sensor);
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muxer_set(active_sensor);
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offset_measure_start(active_sensor);
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while(!mcpadc_has_new_data()) _delay_ms(10);
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mcpadc_get_data(); // first data after switch to trash
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while(!mcpadc_has_new_data()) _delay_ms(10);
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data = mcpadc_get_data();
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// dbgLog("retrieved offset data %i\n", data);
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// TODO: what to do with the offset?
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offset_measure_stop();
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}
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// measure ambient
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muxer_set(5);
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while(!mcpadc_has_new_data()) _delay_ms(10);
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mcpadc_get_data(); // first data after switch to trash
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while(!mcpadc_has_new_data()) _delay_ms(10);
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data = mcpadc_get_data();
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process_ambient_value(data);
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/* SOFTTIMER(1,8000) { // maybe measure coldjunction comp
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/* // first measure ntc offset?! maybe? */
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/* offset_measure_start(active_sensor); */
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/* while(!mcpadc_has_new_data()) _delay_ms(1); */
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/* mcpadc_get_data(); // first data after switch to trash */
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/* while(!mcpadc_has_new_data()) _delay_ms(1); */
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/* data = mcpadc_get_data(); */
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/* offset_measure_stop(); */
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/* // now measure temp-data */
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/* while(!mcpadc_has_new_data()) _delay_ms(1); */
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/* mcpadc_get_data(); // first data after switch to trash */
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/* while(!mcpadc_has_new_data()) _delay_ms(1); */
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/* data = mcpadc_get_data(); */
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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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/* the ATOMIC is acutally only needed if timer1_acc is never read from an ISR, which
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* is probably the case.
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* ATOMIC_FORCEON: the ISR_NOBLOCK sets sei() a few cycles before.
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*/
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ATOMIC_BLOCK(ATOMIC_FORCEON){
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timer1_acc=timertmp;
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}
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}
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