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hugo LAMY
2025-03-14 19:47:02 +01:00
committed by hugogogo
parent 0e87d41c08
commit b12eff7ede
4 changed files with 29 additions and 14 deletions
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20
module05/ex00/adc.c
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@@ -14,13 +14,19 @@ void adc_init(uint8_t prescaler_value) {
ADMUX = (1 << REFS0); // Table 24-3 : set voltage reference, AVCC with external capacitor at AREF pin
ADCSRA = (1 << ADEN); // 24.9.2 : enable ADC
ADCSRA |= ADC_PRESCALE_SET(prescaler_value); // Table 24-5 : prescaler ADC
ADCSRB = ADC_TRIGGER_TIMER_1_COMPARE_B; // Table 24-6 : ADC Auto Trigger Source
ADMUX = (ADMUX & 0b11110000) | (adc_channel & 0b1111); // Table 24-4 : Select ADC channel 0, (Table 14-6 : alternate function for RV1 on PC0 -> ADC0)
}
uint16_t adc_read(uint8_t channel) {
CLEAR(PRR, PRADC); // 24.3 : ensure power reduction is disabled for ADC, (10.11.3 : PRR – Power Reduction Register)
ADMUX = (ADMUX & 0b11110000) | (channel & 0b1111); // Table 24-4 : Select ADC channel, (Table 14-6 : alternate function for RV1 on PC0 -> ADC0)
ADMUX |= (1 << ADLAR); // 24.9.1 : enable left adjust result
ADCSRA |= (1 << ADSC); // 24.9.2 : Start conversion, ADSC: ADC Start Conversion
while (ADCSRA & (1 << ADSC)); // Wait for completion
return ADCH; // 24.9.3 : ADC updated only when ADCH is read, not ADCL, so for 8 bits precision uses left adjust result to only read ADCH
void adc_print_hex(uint8_t value) {
char buffer[3] = {0};
int_to_hex_string(value, buffer, 2);
uart_printstr_endl(buffer);
}
ISR(ADC_vect) { // Table 12-6 : interrupt vector for ADC Conversion Complete
uint16_t value = ADC;
adc_print_hex(value);
}