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由 Yuuki NAGAO 提交于
For STM32G4, ADC clock frequency should be equal or less than 60MHz. To satisfy this specification, ADC clock prescaler should be equal or greater than 4 (For example, NUCLEO_G474RE runs 170MHz). In addition, to obtain accurate internal channel value, the ADC clock prescaler is set to 16 because vbat needs at least 12us (16/170*247.5=23.3us). Signed-off-by: NYuuki NAGAO <wf.yn386@gmail.com>
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