stm32f4adc定时器触发采样代码

以下是基于STM32F4xx HAL库的ADC定时器触发采样代码示例：

1. 配置ADC

ADC_HandleTypeDef hadc;

void ADC_Config(void)
{
    ADC_ChannelConfTypeDef sConfig;
    hadc.Instance = ADC1;
    hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
    hadc.Init.Resolution = ADC_RESOLUTION_12B;
    hadc.Init.ScanConvMode = DISABLE;
    hadc.Init.ContinuousConvMode = ENABLE;
    hadc.Init.DiscontinuousConvMode = DISABLE;
    hadc.Init.NbrOfDiscConversion = 0;
    hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
    hadc.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T3_TRGO; // 设置外部触发源为TIM3的TRGO
    hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    hadc.Init.NbrOfConversion = 1;
    hadc.Init.DMAContinuousRequests = DISABLE;
    hadc.Init.EOCSelection = ADC_EOC_SEQ_CONV;
    HAL_ADC_Init(&hadc);

    sConfig.Channel = ADC_CHANNEL_1; // 采样通道
    sConfig.Rank = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
    HAL_ADC_ConfigChannel(&hadc, &sConfig);
}

2. 配置定时器

TIM_HandleTypeDef htim;

void TIM_Config(void)
{
    TIM_MasterConfigTypeDef sMasterConfig;
    htim.Instance = TIM3;
    htim.Init.Prescaler = 8399;
    htim.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim.Init.Period = 999;
    htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    HAL_TIM_Base_Init(&htim);

    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    HAL_TIMEx_MasterConfigSynchronization(&htim, &sMasterConfig);
}

3. 启动定时器

HAL_TIM_Base_Start(&htim);

4. 启动ADC

HAL_ADC_Start(&hadc);

5. 定时器中断处理函数

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    if (htim->Instance == TIM3) {
        HAL_ADC_Start_IT(&hadc); // 启动ADC采样，并开启ADC转换中断
    }
}

6. ADC转换中断处理函数

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
    uint16_t adc_value = HAL_ADC_GetValue(hadc); // 获得采样结果
    // 处理采样结果
}

注意：以上代码仅供参考，具体实现需要根据实际需求进行修改。