stm32f的定时器 GPIO DMA的相关事情

我的相关问题就是这样的：

MSP_INIT:

if(htim_base->Instance==TIM1)
{
/* USER CODE BEGIN TIM1_MspInit 0 */

/* USER CODE END TIM1_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_TIM1_CLK_ENABLE();

/* TIM1 DMA Init */
/* TIM1_UP Init */
hdma_tim1_up.Instance = DMA2_Stream5;
hdma_tim1_up.Init.Channel = DMA_CHANNEL_6;
hdma_tim1_up.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_tim1_up.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim1_up.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim1_up.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_tim1_up.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_tim1_up.Init.Mode = DMA_CIRCULAR;
hdma_tim1_up.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_tim1_up.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_tim1_up) != HAL_OK)
{
Error_Handler();
}

__HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_UPDATE],hdma_tim1_up);

/* USER CODE BEGIN TIM1_MspInit 1 */

/* USER CODE END TIM1_MspInit 1 */
}

 

主程序中调用，

HAL_DMA_Start(&hdma_tim1_up, (GPIOA_BASE + 0x10), (uint32_t)GPIO_IN_DMA, sizeof(GPIO_IN_DMA));
__HAL_TIM_ENABLE_DMA(&htim1, TIM_DMA_UPDATE);
HAL_TIM_Base_Start(&htim1);

 

中断程序 ：

void DMA2_Stream5_IRQHandler(void)
{

HAL_DMA_IRQHandler(&hdma_tim1_up);

}

最重要的事情是 STM32F4的2个DMA，只有DMA2才可以在源和目的之间访问所有的外设和内存