关于GD32F427 DMA+PWM控制WS2812B的丢波问题，STM32不会丢

static void MX_TIM4_Init(void)

{



  /* USER CODE BEGIN TIM4_Init 0 */



  /* USER CODE END TIM4_Init 0 */



  TIM_MasterConfigTypeDef sMasterConfig = {0};

  TIM_OC_InitTypeDef sConfigOC = {0};



  /* USER CODE BEGIN TIM4_Init 1 */



  /* USER CODE END TIM4_Init 1 */

  htim4.Instance = TIM4;

  htim4.Init.Prescaler = 0;

  htim4.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim4.Init.Period = 112-1;

  htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

  htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

  if (HAL_TIM_PWM_Init(&htim4) != HAL_OK)

  {

    Error_Handler();

  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  if (HAL_TIMEx_MasterConfigSynchronization(&htim4, &sMasterConfig) != HAL_OK)

  {

    Error_Handler();

  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;

  sConfigOC.Pulse = 0;

  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

  if (HAL_TIM_PWM_ConfigChannel(&htim4, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN TIM4_Init 2 */

  /* USER CODE END TIM4_Init 2 */

 // HAL_TIM_Base_Start_IT(&htim4);

  HAL_TIM_MspPostInit(&htim4);



}



void DMA1_Stream0_IRQHandler(void)

{

    HAL_DMA_IRQHandler(&hdma_tim4_ch1); // 调用HAL库中断处理函数

}



// 补充DMA传输完成回调（可选，用于确认传输结束）

void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)

{

    if (htim == &htim4)

    {

        HAL_TIM_PWM_Stop_DMA(&htim4, TIM_CHANNEL_1); // 传输完成后停止PWM



        //rt_kprintf("call back\r\n");

    }

}







/**

  * Enable DMA controller clock

  */

static void MX_DMA_Init(void)

{



  /* DMA controller clock enable */

  __HAL_RCC_DMA1_CLK_ENABLE();



  /* DMA interrupt init */

  /* DMA1_Stream0_IRQn interrupt configuration */

  HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0);

  HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);





}

void ws2812_load(void)

{



    if (HAL_OK != HAL_TIM_PWM_Start_DMA(&htim4,TIM_CHANNEL_1,(uint32_t *)WS2812_RGB_Buff,sizeof(WS2812_RGB_Buff)/sizeof(uint16_t)));//sizeof(WS2812_RGB_Buff)/sizeof(uint16_t))

    {

       // rt_kprintf("HAL_TIM_PWM_Start_DMA err");

    }

}

void ws_set_color(uint16_t num, uint32_t rgb_data)

{

    uint16_t i,j,z=0;



    for(i=0;i<24;i++)

    {

        WS2812_RGB_Buff[24 * num + i] = (((rgb_data << i) & 0X800000) ? WS_H : WS_L);

    }



}