[stm32] perform an automatic ADC calibration using HAL_ADCEx_Calibration_Start()#3811

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BernardXiong merged 1 commit intoRT-Thread:masterfrom

luhuadong:develop

Aug 12, 2020

Commits on Aug 11, 2020

[stm32] perform an automatic ADC calibration to improve the conversion accuracy using function HAL_ADCEx_Calibration_Start().
luhuadong
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