TIMER 触发 DMA - AD 转换，STM32F4 works only ones

Question

我正在 Nucleo STM32F401RE 板上通过定时器触发的 DMA 传输实现 A/D 转换。 用于时基的 TIMER2 和带有 DMA 查看调试的 ADC 都很好。 但是当我使用定时器启动 AD 转换时它只工作一次，然后定时器继续，但不启动 ADC。

我找不到是否有要清除或设置的标志。 这里的代码：

TIMER 2（将

sMasterConfig.MasterOutputTrigger

从

TIM_TRGO_RESET

更改为

TIM_TRGO_UPDATE

，否则 ADC 永远不会启动）：

void MX_TIM2_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 100;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 100;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;  //TIM_TRGO_RESET
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  sConfigOC.OCMode = TIM_OCMODE_TIMING;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

ADC（如果我在一个突发结束时设置 DMA 连续请求立即启动另一个并忽略计时器）：

void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
  hadc1.Init.Resolution = ADC_RESOLUTION_8B;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_TRGO;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;

  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;

}

MAIN 和回调：

#define DEBUG 1
#define UART_RX_BUF_SIZE 1
#define UART_TIMEOUT 0X00000FFF
#define ADC_BUF_SIZE 10

volatile uint8_t UART_rx_buf[UART_RX_BUF_SIZE] = {0};
volatile uint8_t UART_rx_pending = 0;
const volatile char UART_tx_start[1] = "U";
volatile uint8_t UART_timeout = 0;

volatile uint16_t ADC_buf[ADC_BUF_SIZE] = {0};

int main(void)
{
  HAL_Init();

  SystemClock_Config();
  
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART2_UART_Init();
  MX_ADC1_Init();
  MX_TIM2_Init();

#ifdef DEBUG
  DBGMCU->APB1FZ |= DBGMCU_APB1_FZ_DBG_TIM2_STOP;
#endif

  /*INITIALIZATION: SEND A CHARACTER AND WAIT FOR A RESPONSE*/
  HAL_Delay(10);
  UART_timeout = HAL_UART_Transmit(&huart2, (uint8_t*)UART_tx_start, (uint16_t)1, (uint32_t)UART_TIMEOUT);
  UART_timeout = HAL_UART_Receive(&huart2, (uint8_t*)UART_rx_buf, (uint16_t)UART_RX_BUF_SIZE, (uint32_t)UART_TIMEOUT);
      if(UART_timeout == HAL_TIMEOUT)  UART_config_timeout();

  /*START CONFIGURATION*/
  TIMER_CONFIG(UART_rx_buf[0]);     //SET TIMER PRSC AND ARR

  HAL_UART_Receive_IT(&huart2, (uint8_t*)UART_rx_buf, (uint16_t)UART_RX_BUF_SIZE);  //UART RX INTERUPT ENABLE
  TIM2 -> EGR |= 0x00000001;    //RESET TIMER
  HAL_TIM_Base_Start(&htim2);   //START TIMER
  HAL_ADC_Start_DMA(&hadc1, (uint32_t*) ADC_buf, ADC_BUF_SIZE);     //START ADC-DMA REQUEAST

  while (1)
  {
      if(UART_rx_pending == 1)  {

            UART_rx_pending = 0;
            /*MANAGE RX DATA*/
            HAL_UART_Receive_IT(&huart2, (uint8_t*)UART_rx_buf, (uint16_t)UART_RX_BUF_SIZE);
      }
  }
}

=============================================================================================

void HAL_UART_RxCpltCallback(UART_HandleTypeDef* huart
{
    UART_rx_pending = 1
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
}

main 的第一部分与 pc 进行短数据传输以设置 TIMER2 的 ARR 和 PSC，在调试中它们的值是固定的，并且 EGR 被屏蔽以便用 ARR 和 PSC 的新值重置定时器。

有什么我想念的吗？