95 lines
1.7 KiB
C
95 lines
1.7 KiB
C
//adc.c
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#include "adc.h"
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#include <stdio.h>
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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uint8_t adc_state;
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uint8_t adc_count;
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uint16_t adc_values[ADC_CHAN_CNT];
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uint16_t adc_sim_mask;
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#ifdef ADC_CALLBACK
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extern void ADC_CALLBACK(void);
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#endif //ADC_CALLBACK
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void adc_init(void)
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{
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printf_P(PSTR("adc_init\n"));
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adc_sim_mask = 0x00;
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ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
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ADMUX |= (1 << REFS0);
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ADCSRA |= (1 << ADEN);
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// ADCSRA |= (1 << ADIF) | (1 << ADSC);
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DIDR0 = (ADC_CHAN_MSK & 0xff);
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DIDR2 = (ADC_CHAN_MSK >> 8);
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adc_reset();
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// adc_sim_mask = 0b0101;
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// adc_sim_mask = 0b100101;
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// adc_values[0] = 1023 * 16;
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// adc_values[2] = 1023 * 16;
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// adc_values[5] = 1002 * 16;
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}
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void adc_reset(void)
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{
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adc_state = 0;
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adc_count = 0;
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uint8_t i; for (i = 0; i < ADC_CHAN_CNT; i++)
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if ((adc_sim_mask & (1 << i)) == 0)
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adc_values[i] = 0;
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}
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void adc_setmux(uint8_t ch)
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{
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ch &= 0x0f;
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if (ch & 0x08) ADCSRB |= (1 << MUX5);
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else ADCSRB &= ~(1 << MUX5);
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ADMUX = (ADMUX & ~(0x07)) | (ch & 0x07);
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}
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uint8_t adc_chan(uint8_t index)
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{
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uint8_t chan = 0;
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uint16_t mask = 1;
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while (mask)
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{
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if ((mask & ADC_CHAN_MSK) && (index-- == 0)) break;
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mask <<= 1;
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chan++;
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}
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return chan;
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}
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void adc_cycle(void)
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{
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if (adc_state & 0x80)
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{
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uint8_t index = adc_state & 0x0f;
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if ((adc_sim_mask & (1 << index)) == 0)
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adc_values[index] += ADC;
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if (++index >= ADC_CHAN_CNT)
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{
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index = 0;
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adc_count++;
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if (adc_count >= ADC_OVRSAMPL)
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{
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#ifdef ADC_CALLBACK
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ADC_CALLBACK();
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#endif //ADC_CALLBACK
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adc_reset();
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}
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}
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adc_setmux(adc_chan(index));
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adc_state = index;
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}
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else
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{
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ADCSRA |= (1 << ADSC); //start conversion
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adc_state |= 0x80;
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}
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}
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