diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/app/adctest/Kconfig | 6 | ||||
-rw-r--r-- | src/app/adctest/Makefile.inc | 9 | ||||
-rw-r--r-- | src/app/adctest/main.cc | 79 |
3 files changed, 94 insertions, 0 deletions
diff --git a/src/app/adctest/Kconfig b/src/app/adctest/Kconfig new file mode 100644 index 0000000..4739855 --- /dev/null +++ b/src/app/adctest/Kconfig @@ -0,0 +1,6 @@ +# Copyright 2021 Daniel Friesel +# +# SPDX-License-Identifier: CC0-1.0 + +prompt "ADC Test" +depends on meta_driver_adc && arch_arduino_nano && loop && !wakeup diff --git a/src/app/adctest/Makefile.inc b/src/app/adctest/Makefile.inc new file mode 100644 index 0000000..c201be2 --- /dev/null +++ b/src/app/adctest/Makefile.inc @@ -0,0 +1,9 @@ +# vim:ft=make +# +# Copyright 2021 Daniel Friesel +# +# SPDX-License-Identifier: CC0-1.0 + +ifdef app + loop = 1 +endif diff --git a/src/app/adctest/main.cc b/src/app/adctest/main.cc new file mode 100644 index 0000000..7a87ede --- /dev/null +++ b/src/app/adctest/main.cc @@ -0,0 +1,79 @@ +/* + * 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; +} |