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STM32H743单片机实现ADC+DMA多通道检测+事件组

news 来源：原创 2025/5/7 7:22:24

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

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

#define ADC2_CONVERSION_COMPLETE_BIT	0x01
#define ADC3_CONVERSION_COMPLETE_BIT	0x02void 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

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);}
}