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| author | joeycastillo <joeycastillo@utexas.edu> | 2022-01-25 17:57:25 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-01-25 17:57:25 -0500 |
| commit | bbda09e23f0048e42b815a200005df661337caf0 (patch) | |
| tree | 3ae5d6c0af28986d2c2743604c04777c939f31af /watch-library/hardware | |
| parent | 71ea3b9de98de7034c081adaae2e1e1ff79390d4 (diff) | |
| parent | 84b65cb699ead52033844fb9355f426bdaef5e3e (diff) | |
| download | Sensor-Watch-bbda09e23f0048e42b815a200005df661337caf0.tar.gz Sensor-Watch-bbda09e23f0048e42b815a200005df661337caf0.tar.bz2 Sensor-Watch-bbda09e23f0048e42b815a200005df661337caf0.zip | |
Merge pull request #44 from a2/voltage-reference
Remove ADC_* defines in favor of hardware-specific mapping
Diffstat (limited to 'watch-library/hardware')
| -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). |