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| author | Joey Castillo <joeycastillo@utexas.edu> | 2022-01-26 20:36:49 -0500 |
|---|---|---|
| committer | Joey Castillo <joeycastillo@utexas.edu> | 2022-01-26 20:36:49 -0500 |
| commit | fe5a3eecff0ca2fcaf5ac5eb00a8aa50b5064ece (patch) | |
| tree | 7883e3f9a51eb8587f227b9ebe09d6554e989084 /watch-library/hardware/watch | |
| parent | f036d6a515b73400e7ea6dea09dfaf2a1ad0080a (diff) | |
| parent | 5d5e5b125a383174f1891d37498415cc10fe84fe (diff) | |
| download | Sensor-Watch-fe5a3eecff0ca2fcaf5ac5eb00a8aa50b5064ece.tar.gz Sensor-Watch-fe5a3eecff0ca2fcaf5ac5eb00a8aa50b5064ece.tar.bz2 Sensor-Watch-fe5a3eecff0ca2fcaf5ac5eb00a8aa50b5064ece.zip | |
Merge branch 'main' of github.com:joeycastillo/Sensor-Watch into main
Diffstat (limited to 'watch-library/hardware/watch')
| -rw-r--r-- | watch-library/hardware/watch/watch_adc.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/watch-library/hardware/watch/watch_adc.c b/watch-library/hardware/watch/watch_adc.c index 5ba7abdf..32f06680 100644 --- a/watch-library/hardware/watch/watch_adc.c +++ b/watch-library/hardware/watch/watch_adc.c @@ -23,6 +23,7 @@ */ #include "watch_adc.h" +#include "driver_init.h" static void _watch_sync_adc(void) { while (ADC->SYNCBUSY.reg); @@ -138,13 +139,30 @@ void watch_set_analog_sampling_length(uint8_t cycles) { _watch_sync_adc(); } +static inline uint32_t _watch_adc_get_reference_voltage(const watch_adc_reference_voltage reference) { + switch (reference) { + case ADC_REFERENCE_INTREF: + return ADC_REFCTRL_REFSEL_INTREF_Val; + break; + case ADC_REFERENCE_VCC_DIV1POINT6: + return ADC_REFCTRL_REFSEL_INTVCC0_Val; + break; + case ADC_REFERENCE_VCC_DIV2: + return ADC_REFCTRL_REFSEL_INTVCC1_Val; + break; + case ADC_REFERENCE_VCC: + return ADC_REFCTRL_REFSEL_INTVCC2_Val; + break; + } +} + void watch_set_analog_reference_voltage(watch_adc_reference_voltage reference) { ADC->CTRLA.bit.ENABLE = 0; if (reference == ADC_REFERENCE_INTREF) SUPC->VREF.bit.VREFOE = 1; else SUPC->VREF.bit.VREFOE = 0; - ADC->REFCTRL.bit.REFSEL = reference; + ADC->REFCTRL.bit.REFSEL = _watch_adc_get_reference_voltage(reference); ADC->CTRLA.bit.ENABLE = 1; _watch_sync_adc(); // throw away one measurement after reference change (the channel doesn't matter). |