stm32f407定时器触发adc dma多通道采样HAL库代码

以下是基于HAL库的stm32f407定时器触发adc dma多通道采样代码：

首先，需要初始化定时器和ADC：

TIM_HandleTypeDef htim;
ADC_HandleTypeDef hadc;

void MX_TIM_Init(void)
{
    TIM_MasterConfigTypeDef sMasterConfig = {0};
    htim.Instance = TIMx;
    htim.Init.Prescaler = TIMx_PRESCALER;
    htim.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim.Init.Period = TIMx_PERIOD;
    htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim.Init.RepetitionCounter = 0;
    HAL_TIM_Base_Init(&htim);
    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    HAL_TIMEx_MasterConfigSynchronization(&htim, &sMasterConfig);
}

void MX_ADC_Init(void)
{
    ADC_ChannelConfTypeDef sConfig = {0};
    hadc.Instance = ADCx;
    hadc.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
    hadc.Init.Resolution = ADC_RESOLUTION_12B;
    hadc.Init.ScanConvMode = ENABLE;
    hadc.Init.ContinuousConvMode = DISABLE;
    hadc.Init.DiscontinuousConvMode = DISABLE;
    hadc.Init.NbrOfDiscConversion = 0;
    hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
    hadc.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_Tx_TRGO;
    hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    hadc.Init.NbrOfConversion = ADC_CHANNEL_NUM;
    hadc.Init.DMAContinuousRequests = ENABLE;
    hadc.Init.EOCSelection = ADC_EOC_SEQ_CONV;
    HAL_ADC_Init(&hadc);
    for (int i = 0; i < ADC_CHANNEL_NUM; ++i) {
        sConfig.Channel = ADC_CHANNEL_x[i];
        sConfig.Rank = i + 1;
        sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
        HAL_ADC_ConfigChannel(&hadc, &sConfig);
    }
}

然后，需要初始化DMA和中断：

DMA_HandleTypeDef hdma_adc;

void MX_DMA_Init(void)
{
    hdma_adc.Instance = DMAx_STREAMx;
    hdma_adc.Init.Channel = DMA_CHANNELx;
    hdma_adc.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_adc.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_adc.Init.MemInc = DMA_MINC_ENABLE;
    hdma_adc.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
    hdma_adc.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    hdma_adc.Init.Mode = DMA_CIRCULAR;
    hdma_adc.Init.Priority = DMA_PRIORITY_HIGH;
    hdma_adc.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    HAL_DMA_Init(&hdma_adc);
    __HAL_LINKDMA(&hadc, DMA_Handle, hdma_adc);
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
    if (hadc->Instance == ADCx) {
        HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
    }
}

最后，在main函数中启动定时器和DMA：

int main(void)
{
    HAL_Init();
    MX_TIM_Init();
    MX_ADC_Init();
    MX_DMA_Init();

    HAL_TIM_Base_Start(&htim);
    HAL_ADC_Start_DMA(&hadc, (uint32_t*)adc_buf, ADC_CHANNEL_NUM);

    while (1) {
        HAL_Delay(1000);
    }
}