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Merge pull request #9252 from jeromecoutant/PR_L4VBAT 

STM32L4 ADC : power optimisation for VBAT channel
pull/9156/head
Cruz Monrreal 2019-01-04 11:36:10 -06:00 committed by GitHub
parent c580260504 164fee0e61
commit 90fd6cdf27
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1 changed files with 7 additions and 0 deletions
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7
targets/TARGET_STM/TARGET_STM32L4/analogin_device.c
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@ -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;