STM32F103 UART中断接收 DMA发送

以USART3为例，

（1）首先在【stm32f1xx_hal_conf.h】中使能DMA模块，工程增加stm32f1xx_hal_dma.c。

（2）main.c中头部增加以下声明

UART_HandleTypeDef huart3;

DMA_HandleTypeDef hdma1_uart3;

（3）main.c中增加USART的初始化

/* USART3 init function */

static void MX_USART3_UART_Init(void)

{

huart3.Instance = USART3;

huart3.Init.BaudRate = 115200;

huart3.Init.WordLength = UART_WORDLENGTH_8B;

huart3.Init.StopBits = UART_STOPBITS_1;

huart3.Init.Parity = UART_PARITY_NONE;

huart3.Init.Mode = UART_MODE_TX_RX;

huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;

huart3.Init.OverSampling = UART_OVERSAMPLING_16;

if (HAL_UART_Init(&huart3) != HAL_OK)

{

Error_Handler();

}

}

（4）stm32f1xx_hal_msp.c增加

extern  UART_HandleTypeDef huart3;

extern DMA_HandleTypeDef hdma1_uart3;

......................

void HAL_UART_MspInit(UART_HandleTypeDef* huart)

{

GPIO_InitTypeDef GPIO_InitStruct;

if (huart->Instance == USART3)

{

/* USER CODE BEGIN USART3_MspInit 0 */

/* USER CODE END USART3_MspInit 0 */

/* Peripheral clock enable */

__HAL_RCC_USART3_CLK_ENABLE();

__HAL_RCC_DMA1_CLK_ENABLE();

/**USART3 GPIO Configuration

PB10     ------> USART3_TX

PB11     ------> USART3_RX

*/

GPIO_InitStruct.Pin = GPIO_PIN_10;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_11;

GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

GPIO_InitStruct.Pull = GPIO_NOPULL;

HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

hdma1_uart3.Instance = DMA1_Channel2;

hdma1_uart3.Init.Direction = DMA_MEMORY_TO_PERIPH;

hdma1_uart3.Init.PeriphInc = DMA_PINC_DISABLE;

hdma1_uart3.Init.MemInc = DMA_MINC_ENABLE;

hdma1_uart3.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

hdma1_uart3.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

hdma1_uart3.Init.Mode = DMA_NORMAL;

hdma1_uart3.Init.Priority = DMA_PRIORITY_LOW;

HAL_DMA_DeInit(&hdma1_uart3);

HAL_DMA_Init(&hdma1_uart3);

__HAL_LINKDMA(huart, hdmatx, hdma1_uart3);

HAL_NVIC_SetPriority(DMA1_Channel2_IRQn, 2, 0);

HAL_NVIC_EnableIRQ(DMA1_Channel2_IRQn);

/* Peripheral interrupt init */

HAL_NVIC_SetPriority(USART3_IRQn, USART_IRQn_PP, 0);

HAL_NVIC_EnableIRQ(USART3_IRQn);

__HAL_UART_ENABLE_IT(&huart3, USART_IT_RXNE);//使能串口3  读数据寄存器非空中断RXNE

/* USER CODE BEGIN USART3_MspInit 1 */

/* USER CODE END USART3_MspInit 1 */

}

}

void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)

{

if (huart->Instance == USART3)

{

/* USER CODE BEGIN USART3_MspDeInit 0 */

/* USER CODE END USART3_MspDeInit 0 */

/* Peripheral clock disable */

__HAL_RCC_USART3_CLK_DISABLE();

__HAL_RCC_DMA1_CLK_DISABLE();

/**USART3 GPIO Configuration

PB10     ------> USART3_TX

PB11     ------> USART3_RX

*/

HAL_GPIO_DeInit(GPIOB, GPIO_PIN_10 | GPIO_PIN_11);

HAL_DMA_DeInit(&hdma1_uart3);

/* Peripheral interrupt DeInit*/

HAL_NVIC_DisableIRQ(USART3_IRQn);

HAL_NVIC_DisableIRQ(DMA1_Channel2_IRQn);

__HAL_UART_DISABLE_IT(&huart3, USART_IT_RXNE);

/* USER CODE BEGIN USART3_MspDeInit 1 */

/* USER CODE END USART3_MspDeInit 1 */

}

}

（5）stm32f1xx_it.c增加

extern UART_HandleTypeDef huart3;

extern DMA_HandleTypeDef hdma1_uart3;

.............................

/******************************************************

函数名称：USART3_Own_IRQHandler

函数描述：USART3中断服务自定义代码部分

输入参数：pLinuxClass：传入LINUX_OBJECT

返回值：无

******************************************************/

void USART3_Own_IRQHandler(LINUX_CLASS *pLinuxClass)

{

unsigned char  ucValue;

// 使用了DMA发送，一定要加UART_FLAG_RXNE判断，否则成功回复一次后，会一直进下面这段，不知道原因

if ((__HAL_UART_GET_IT_SOURCE(&huart3, UART_IT_RXNE) != RESET) && (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_RXNE)!= RESET))// 接收中断

{

pLinuxClass->Rx_FROM_linux[pLinuxClass->Rx_FROM_linux_Counter] = (uint8_t)(huart3.Instance->DR & 0x00FF);

pLinuxClass->Rx_FROM_linux_Counter++;

if (pLinuxClass->Rx_FROM_linux_Counter >= RX_LINUX_MAX)

{

pLinuxClass->Rx_FROM_linux_Counter = 0; 

}

pLinuxClass->RX_BYTE_TimeoutCounter_Lock = 0; // 接收数据字节间超时计时器开启

pLinuxClass->RX_BYTE_TimeoutCounter = 0;

__HAL_UART_CLEAR_FLAG(&huart3, UART_FLAG_RXNE );

}

if ((__HAL_UART_GET_IT_SOURCE(&huart3, UART_IT_TC) != RESET) && (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_TC)!= RESET))

{

huart3.State = HAL_UART_STATE_BUSY_RX;

__HAL_UART_CLEAR_FLAG(&huart3, UART_FLAG_TC );

WRITE_485UN; // 485通讯方式

}

// 溢出-如果发生溢出需要先读SR,再读DR寄存器 则可清除不断入中断的问题

if (__HAL_UART_GET_FLAG(&huart3,USART_FLAG_ORE) != RESET) 

{

__HAL_UART_CLEAR_FLAG(&huart3,USART_FLAG_ORE);  // read SR

ucValue = (uint8_t)( huart3.Instance->DR & (uint8_t)0x00FF); // read DR 

}

(void)ucValue;

}

void USART3_IRQHandler(void)

{

/* USER CODE BEGIN USART3_IRQn 0 */

USART3_Own_IRQHandler(&LINUX_OBJECT);

/* USER CODE END USART3_IRQn 0 */

/* USER CODE BEGIN USART3_IRQn 1 */

/* USER CODE END USART3_IRQn 1 */

}

void DMA1_Channel2_IRQHandler(void)

{

HAL_DMA_IRQHandler(&hdma1_uart3);

}