STM32H743单片机实现ADC+DMA多通道检测+事件组

Johnson Sheng2025-05-07 20:51

在上个文章基础上改用事件组进行处理，以便实时任务。

stm32cubeMX自动生成代码

复制代码

osEventFlagsId_t adctestEventHandle;
const osEventFlagsAttr_t adctestEvent_attributes = {
  .name = "adctestEvent"
};


adctestEventHandle = osEventFlagsNew(&adctestEvent_attributes);

编写代码DMA回调函数触发事件

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#define ADC2_CONVERSION_COMPLETE_BIT	0x01
#define ADC3_CONVERSION_COMPLETE_BIT	0x02

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) {
	if (hadc->Instance == ADC2)  // 确认是ADC2的转换完成
	{
		osEventFlagsSet(adctestEventHandle, ADC2_CONVERSION_COMPLETE_BIT);
		HAL_ADC_Stop_DMA(&hadc2);
	} else if (hadc->Instance == ADC3)  // 确认是ADC3的转换完成
	{
		osEventFlagsSet(adctestEventHandle, ADC3_CONVERSION_COMPLETE_BIT);
		HAL_ADC_Stop_DMA(&hadc3);
	}
}

事件触发逻辑处理

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void AdcTask(void *argument)
{
	Start_ADC2_DMA();
	Start_ADC3_DMA();
	int i = 0;
	uint32_t ret = 0;
	float voltage;
	for (;;) {
		ret = osEventFlagsWait(adctestEventHandle, ADC2_CONVERSION_COMPLETE_BIT | ADC3_CONVERSION_COMPLETE_BIT, osFlagsWaitAny, osWaitForever);

		if ((ret & ADC2_CONVERSION_COMPLETE_BIT) != 0)
		{
			/* 打印ADC2数据 */
			for (i = 0; i < hadc2.Init.NbrOfConversion; i++) {
				voltage = adc2_values[i] * VEF / VEFVALUE;
				printf("ADC2[%d] = %d.%dV\r\n", i, (uint32_t) voltage,
								(uint32_t) (voltage * 100) % 100);
			}
			printf("\n");
		}
		if ((ret & ADC3_CONVERSION_COMPLETE_BIT) != 0)
		{
			/* 打印ADC3数据 */
			for (i = 0; i <  hadc3.Init.NbrOfConversion; i++) {
				voltage = adc3_values[i] * VEF / VEFVALUE;
				printf("ADC3[%d] = %d.%dV\r\n", i, (uint32_t) voltage,
								(uint32_t) (voltage * 100) % 100);
			}
			printf("\n\n");
		}

		osDelay(1);
	}
}