ADC

红细胞

#define CR2_EXTTRIG_SWSTART_Set     ((uint32_t)0x00500000)
void ADC_SoftwareStartConvCmd(ADC_TypeDef* ADCx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_ADC_ALL_PERIPH(ADCx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected ADC conversion on external event and start the selected
       ADC conversion */
    ADCx->CR2 |= CR2_EXTTRIG_SWSTART_Set;
  }
  else
  {
    /* Disable the selected ADC conversion on external event and stop the selected
       ADC conversion */
    ADCx->CR2 &= CR2_EXTTRIG_SWSTART_Reset;
  }
}
这里“#define CR2_EXTTRIG_SWSTART_Set     ((uint32_t)0x00500000)”把ADC_CR2的位22SWSTART和位20EXTTRIG都使能了，为什么呀？

魚丸粗麵

设置为软件使能和外部触发，跟宏的字面意思一致