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Merge pull request #4929 from bcostm/adc_sampletime_vrefint 

STM32F4: Increase ADC sample time for VREF
pull/4983/head
Jimmy Brisson 2017-09-05 11:15:53 -05:00 committed by GitHub
parent 5bddd881e9 d0fce353cc
commit 94fb4a3aad
1 changed files with 3 additions and 2 deletions
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5
targets/TARGET_STM/TARGET_STM32F4/analogin_api.c
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@ -180,11 +180,12 @@ static inline uint16_t adc_read(analogin_t *obj)
break; break;
case 17: case 17:
sConfig.Channel = ADC_CHANNEL_VREFINT; sConfig.Channel = ADC_CHANNEL_VREFINT;
/* From experiment, measurement needs max sampling time to be valid */
sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
break; break;
case 18: case 18:
sConfig.Channel = ADC_CHANNEL_VBAT; sConfig.Channel = ADC_CHANNEL_VBAT;
/* From experiment, VBAT measurement needs max /* From experiment, measurement needs max sampling time to be valid */
* sampling time to be avlid */
sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
break; break;
default: default: