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STM32F407ZGT6开发板是如何去实现串口接收的

问答对人有帮助，内容完整，我也想知道答案 0 STM32F407ZGT6开发板是如何去实现串口接收的？ STM32F407ZGT6开发板有哪几种方法可以实现串口接收呢？ 0
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答案对人有帮助，有参考价值 0 开发环境 STM32CUBMX 正点原子STM32F407ZGT6探索者开发板 MDK-ARM 5.31 第一种方式：直接接收配置外部时钟源 2.配置时钟树 3.配置串口一生产代码后进入工程重定向printf到串口1(建议在usart.c里重定向) 重定向代码块 int main(void) { /* USER CODE BEGIN 1 / / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_USART1_UART_Init(); printf("hello wroldrn"); / USER CODE BEGIN 2 / / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / HAL_UART_Receive(&huart1,receive_buff,10,0xff);// 接收10个字符 if(receive_buff[0] != 0) { printf("recive buff is %s rn",receive_buff); memset(receive_buff,0,20); // 清除接收内容 } } / USER CODE END 3 / } 实验现象第二种方式：中断方式时钟准备和串口初始化如上一种方式所示，实例从设置中断开始设置中断* 生成代码定义相关变量 uint8_t aRxBuffer; //接收中断缓冲 uint8_t Uart1_RxBuff[256] = {0}; //接收缓冲 uint8_t Uart1_Rx_Cnt = 0; //接收缓冲计数 uint8_t Uart1_RxFlag = 0; uint8_t cAlmStr[] = "数据溢出(大于256)rn"; 在usart.h 中编写回调函数 void HAL_UART_RxCpltCallback(UART_HandleTypeDef huart) { / Prevent unused argument(s) compilation warning / UNUSED(huart); / NOTE: This function Should not be modified, when the callback is needed, the HAL_UART_TxCpltCallback could be implemented in the user file / if(Uart1_Rx_Cnt >= 255) //溢出判断 { Uart1_Rx_Cnt = 0; memset(Uart1_RxBuff,0x00,sizeof(Uart1_RxBuff)); HAL_UART_Transmit(&huart1, (uint8_t )&cAlmStr, sizeof(cAlmStr),0xFFFF); } else { Uart1_RxBuff[Uart1_Rx_Cnt++] = aRxBuffer; //接收数据转存 if((Uart1_RxBuff[Uart1_Rx_Cnt-1] == 0x0A)&&(Uart1_RxBuff[Uart1_Rx_Cnt-2] == 0x0D)) //判断结束位 { Uart1_RxFlag = 1; } } HAL_UART_Receive_IT(&huart1, (uint8_t )&aRxBuffer, 1); //再开启接收中断 } main函数内内容 int main(void) { / USER CODE BEGIN 1 / / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_USART1_UART_Init(); / USER CODE BEGIN 2 / HAL_UART_Receive_IT(&huart1,&aRxBuffer,1); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / if(Uart1_RxFlag != 0) { printf("recive buff is %srn",Uart1_RxBuff); Uart1_RxFlag = 0; Uart1_Rx_Cnt = 0; memset(Uart1_RxBuff,0x00,256); } HAL_Delay(10); } / USER CODE END 3 / } 实验现象第三种方法：定时器中断判断串口是否传输完成此方法可以看做是看作中断接收的一种拓展用法，不同于上一种方法介绍的需要特定的格式的数据帧来判定，此方法结合了定时器，以5ms为界限，如果5ms后没有接收新的数据则认为一包数据已经发送完成。下面是配置的具体方法 1.配置时钟和串口中断的同上，然后配置定时器中断定时器基础配置打开定时器中断我们设置的5ms检测串口是否发送完成我们使用的定时器的主频是84MHZ 那么定时器频率可用下列方式计算 F = 84 M H Z ( P r e s c a l e r + 1 ) × ( C o u n t e r P e r i o d + 1 ) ; F = frac{84MHZ}{(Prescaler+1)times (CounterPeriod+1)}; F=(Prescaler+1)×(CounterPeriod+1)84MHZ; 配置完成后生成代码程序部分* 定义相关变量 uint8_t aRxBuffer; //接收中断缓冲 uint8_t Uart1_RxBuff[256] = {0}; //接收缓冲 uint8_t Uart1_Rx_Cnt = 0; //接收缓冲计数 uint8_t Uart1_RxFlag = 0; uint8_t cAlmStr[] = "数据溢出(大于256)rn"; 编写串口中断服务函数 void HAL_UART_RxCpltCallback(UART_HandleTypeDef huart) { if(huart -> Instance == USART1) { if(Uart1_Rx_Cnt == 0) { __HAL_TIM_CLEAR_FLAG(&htim6,TIM_FLAG_UPDATE); HAL_TIM_Base_Start_IT(&htim6); Uart1_RxBuff[Uart1_Rx_Cnt] = aRxBuffer; Uart1_Rx_Cnt ++; } else { Uart1_RxBuff[Uart1_Rx_Cnt ++] = aRxBuffer; } if(Uart1_Rx_Cnt >= 255) { Uart1_Rx_Cnt = 0; Uart1_RxFlag = 0; memset(Uart1_RxBuff,0x00,256); } HAL_UART_Receive_IT(&huart1,&aRxBuffer,1); } } 编写定时器中断回调函数 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef htim) { if(htim ->Instance == TIM6) { HAL_TIM_Base_Stop(&htim6); __HAL_TIM_SetCounter(&htim6,0); Uart1_RxFlag = 1; } } 编写主程序 int main(void) { /* USER CODE BEGIN 1 / / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_TIM6_Init(); MX_USART1_UART_Init(); / USER CODE BEGIN 2 / HAL_UART_Receive_IT(&huart1,&aRxBuffer,1); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / if(Uart1_RxFlag == 1) { printf("rec buff is %srn",Uart1_RxBuff); memset(Uart1_RxBuff,0x00,256); Uart1_Rx_Cnt = 0; Uart1_RxFlag = 0; } HAL_Delay(10); } / USER CODE END 3 / } 实验现象第四种方法：串口空闲中断加DMA 使用DMA可以减少CPU负荷，当接收大批量数据的时候，可以防止频繁进入中断。这样有助于提高效率，下面我们介绍STM32带有的串口空闲中断来配合DMA接收数据的例子。配置部分* 1 串口配置基本部分配置DMA 中断配置生产代码定义宏定义 #define USART1_DMA_REC_SIZE 600 #define USART1_REC_SIZE 1200 编写结构体 typedef struct { uint8_t UsartRecFlag; // 标志位 uint16_t UsartRecLen; // 接收数据长度 uint16_t UsartDMARecLEN; // DMA 接收长度 uint8_t Usart1DMARecBuffer[USART1_DMA_REC_SIZE]; // DMA 接收数组 uint8_t Usart1RecBuffer[USART1_REC_SIZE]; // 接收组 }teUsart1type; 编写打开中断函数 // 打开相关中断 void EnableUsart_It(void) { __HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE); __HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE); __HAL_UART_CLEAR_IDLEFLAG(&huart1); HAL_UART_Receive_DMA(&huart1,Usart1type.Usart1DMARecBuffer,USART1_DMA_REC_SIZE); } 改写中断服务函数(在stm32f4xx_it.c中) void USART1_IRQHandler(void) { /* USER CODE BEGIN USART1_IRQn 0 / uint16_t temp = 0; __HAL_UART_CLEAR_IDLEFLAG(&huart1); HAL_UART_DMAStop(&huart1); // 关闭DMA temp = huart1.Instance -> SR; // 清除SR状态寄存器 temp = huart1.Instance -> DR; // 清除DR数据寄存器，用来清除中断 temp = hdma_usart1_rx.Instance -> NDTR; // 获取未传输的数据个数 //temp = hdma_usart2_rx.Instance -> NDTR; // F4 Usart1type.UsartDMARecLEN = USART1_DMA_REC_SIZE - temp; HAL_UART_RxCpltCallback(&huart1); / USER CODE END USART1_IRQn 0 / HAL_UART_IRQHandler(&huart1); / USER CODE BEGIN USART1_IRQn 1 / HAL_UART_Receive_DMA(&huart1,Usart1type.Usart1DMARecBuffer,USART1_DMA_REC_SIZE); / USER CODE END USART1_IRQn 1 / } 编写中断回调函数 void HAL_UART_RxCpltCallback(UART_HandleTypeDef huart) { if(huart -> Instance == USART1) { if(Usart1type.UsartRecLen > 0) { memcpy(&Usart1type.Usart1RecBuffer[Usart1type.UsartRecLen],Usart1type.Usart1DMARecBuffer,Usart1type.UsartDMARecLEN); Usart1type.UsartRecLen += Usart1type.UsartDMARecLEN; } else { memcpy(&Usart1type.Usart1RecBuffer,Usart1type.Usart1DMARecBuffer,Usart1type.UsartDMARecLEN); Usart1type.UsartRecLen += Usart1type.UsartDMARecLEN; } memset(Usart1type.Usart1DMARecBuffer,0x00,600); Usart1type.UsartRecFlag = 1; } } 编写主程序 int main(void) { /* USER CODE BEGIN 1 / / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_DMA_Init(); MX_USART1_UART_Init(); / USER CODE BEGIN 2 / EnableUsart_It(); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / if(Usart1type.UsartRecFlag == 1) { printf("rec buff is %srn",Usart1type.Usart1RecBuffer); memset(Usart1type.Usart1RecBuffer,0x00,USART1_REC_SIZE); Usart1type.UsartRecLen = 0; Usart1type.UsartRecFlag = 0; } HAL_Delay(20); } / USER CODE END 3 */ } 实验现象 END

2021-12-1 09:20:08 评论举报殷夏