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| 1 | #include "atmega_adc.h"
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| 2 | #include "typedefs.h"
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| 3 |
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| 4 | void atmega_adc_init(void)
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| 5 | {
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| 6 | //ADC einschalten
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| 7 | ADCSRA |= (1<<ADPS2) | (1<<ADPS1); // ADC_clk = 125kHz
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| 8 | ADCSRA &= ~(1<<ADPS0);
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| 9 | // normal conversion takes: 13 adc_clk cycles = 104us
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| 10 | // 1st conversion takes longer: 25 clk cycles = 200us
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| 11 | ADCSRA |= 1<<ADATE; // autotrigger enable
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| 12 | SFIOR &= ~(0xE0); //ADTS=000 --> free running mode
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| 13 | ADCSRA |= (1<<ADEN); // ADC aktivieren
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| 14 |
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| 15 | ADMUX &= ~(1<<REFS0);
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| 16 | ADMUX &= ~(1<<REFS1); //REFS = 00 --> use external reference voltage.
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| 17 | ADMUX |= 1<<ADLAR; //ADLAR =1 --> left adjust ac result in ADCH register --> 8bit resolution only.
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| 18 | ADMUX |= (0x1F & 0x06); //MUX = 0x06 --> Pin ADC6 = PA6 is used as ADC input pin.
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| 19 |
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| 20 | ADCSRA |= (1<<ADSC); // start 1st conversion
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| 21 |
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| 22 | }
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