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STM32L4 ADC : power optimisation for VBAT channel #9252

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Merged
merged 1 commit into from
Jan 4, 2019
Merged

STM32L4 ADC : power optimisation for VBAT channel #9252

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7 changes: 7 additions & 0 deletions targets/TARGET_STM/TARGET_STM32L4/analogin_device.c
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Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,13 @@ uint16_t adc_read(analogin_t *obj)

// Wait end of conversion and get value
if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {

/* Ref Manual: To prevent any unwanted consumption on the battery,
it is recommended to enable the bridge divider only when needed for ADC conversion */
if (sConfig.Channel == ADC_CHANNEL_VBAT) {
CLEAR_BIT(__LL_ADC_COMMON_INSTANCE(obj->handle.Instance)->CCR, LL_ADC_PATH_INTERNAL_VBAT);
}

return (uint16_t)HAL_ADC_GetValue(&obj->handle);
} else {
return 0;
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