diff options
Diffstat (limited to 'stmhal/adc.c')
| -rw-r--r-- | stmhal/adc.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/stmhal/adc.c b/stmhal/adc.c index b94c0f930..e357a0030 100644 --- a/stmhal/adc.c +++ b/stmhal/adc.c @@ -187,10 +187,10 @@ typedef struct _pyb_obj_adc_all_t { void adc_init_all(pyb_obj_adc_all_t *adc_all, uint32_t resolution) { switch (resolution) { - case 6: resolution = ADC_RESOLUTION6b; break; - case 8: resolution = ADC_RESOLUTION8b; break; - case 10: resolution = ADC_RESOLUTION10b; break; - case 12: resolution = ADC_RESOLUTION12b; break; + case 6: resolution = ADC_RESOLUTION6b; break; + case 8: resolution = ADC_RESOLUTION8b; break; + case 10: resolution = ADC_RESOLUTION10b; break; + case 12: resolution = ADC_RESOLUTION12b; break; default: nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "resolution %d not supported", resolution)); @@ -238,18 +238,44 @@ uint32_t adc_config_and_read_channel(ADC_HandleTypeDef *adcHandle, uint32_t chan return adc_read_channel(adcHandle); } +int adc_get_resolution(ADC_HandleTypeDef *adcHandle) { + uint32_t res_reg = __HAL_ADC_GET_RESOLUTION(adcHandle); + + switch (res_reg) { + case ADC_RESOLUTION6b: return 6; + case ADC_RESOLUTION8b: return 8; + case ADC_RESOLUTION10b: return 10; + } + return 12; +} + int adc_read_core_temp(ADC_HandleTypeDef *adcHandle) { int32_t raw_value = adc_config_and_read_channel(adcHandle, ADC_CHANNEL_TEMPSENSOR); + + // Note: constants assume 12-bit resolution, so we scale the raw value to + // be 12-bits. + raw_value <<= (12 - adc_get_resolution(adcHandle)); + return ((raw_value - CORE_TEMP_V25) / CORE_TEMP_AVG_SLOPE) + 25; } float adc_read_core_vbat(ADC_HandleTypeDef *adcHandle) { uint32_t raw_value = adc_config_and_read_channel(adcHandle, ADC_CHANNEL_VBAT); + + // Note: constants assume 12-bit resolution, so we scale the raw value to + // be 12-bits. + raw_value <<= (12 - adc_get_resolution(adcHandle)); + return raw_value * VBAT_DIV / 4096.0f * 3.3f; } float adc_read_core_vref(ADC_HandleTypeDef *adcHandle) { uint32_t raw_value = adc_config_and_read_channel(adcHandle, ADC_CHANNEL_VREFINT); + + // Note: constants assume 12-bit resolution, so we scale the raw value to + // be 12-bits. + raw_value <<= (12 - adc_get_resolution(adcHandle)); + return raw_value * VBAT_DIV / 4096.0f * 3.3f; } |