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/*
* Copyright 2021 Daniel Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "arch.h"
#include "driver/adc.h"
#include "driver/gpio.h"
#include "driver/stdout.h"
void loop(void)
{
uint16_t vcc = adc.getVCC_mV();
uint16_t temp = adc.getTemp_mdegC();
kout << "Voltage " << vcc << " mv" << endl;
kout << "Temperature " << temp << " m°C" << endl;
for (uint8_t admux_sel = 0; admux_sel < 8; admux_sel++) {
// measure with avcc reference
ADMUX = _BV(REFS0) | admux_sel;
// Enable ADC with /64 prescaler
ADCSRA = _BV(ADEN) | _BV(ADPS2);
// Start conversion
ADCSRA |= _BV(ADSC);
// wait until conversion is complete
while (ADCSRA & _BV(ADSC)) ;
uint8_t adcr_l = ADCL;
uint8_t adcr_h = ADCH;
uint16_t adcr = adcr_l + (adcr_h << 8);
uint16_t vadc = (uint32_t)vcc * adcr / 1023L;
kout << "ADC" << admux_sel << " " << vadc << " mV vs AVCC" << endl;
}
// enable bandgap; wait for it to stabilise
ADMUX = _BV(REFS1) | _BV(REFS0);
ADCSRA = _BV(ADEN) | _BV(ADPS2);
arch.delay_ms(1);
for (uint8_t admux_sel = 0; admux_sel < 8; admux_sel++) {
// measure with bandgap reference
ADMUX = _BV(REFS1) | _BV(REFS0) | admux_sel;
// Enable ADC with /64 prescaler
ADCSRA = _BV(ADEN) | _BV(ADPS2);
// Start conversion
ADCSRA |= _BV(ADSC);
// wait until conversion is complete
while (ADCSRA & _BV(ADSC)) ;
uint8_t adcr_l = ADCL;
uint8_t adcr_h = ADCH;
uint16_t adcr = adcr_l + (adcr_h << 8);
uint16_t vadc = 1100L * adcr / 1023L;
kout << "ADC" << admux_sel << " " << vadc << " mV vs 1.1V bandgap" << endl;
}
// disable ADC
ADCSRA &= ~_BV(ADEN);
}
int main(void)
{
arch.setup();
gpio.setup();
kout.setup();
arch.idle_loop();
return 0;
}
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