网站开启gzip,软文范文200字,wordpress 分享类主题,网站网址ip查询1.串口基础 2.串口发送
1#xff09;基本配置 注意#xff1a;实现串口通信功能需在keil中设置打开Use Micro LIB#xff0c;才能通过串口助手观察到串口信息 2)编辑代码
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration-------------…1.串口基础 2.串口发送
1基本配置 注意实现串口通信功能需在keil中设置打开Use Micro LIB才能通过串口助手观察到串口信息 2)编辑代码
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 *//* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */uint8_t msg[]Hello World!\n;while (1){/* USER CODE END WHILE */HAL_UART_Transmit(huart1,msg,sizeof(msg),HAL_MAX_DELAY);/* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}
3)分析 ---关于重定向
huart1是一个串口句柄定义在usart.c中
如果重定向printf或sprintf,只需要重定义fputc和fgetc()
#includestdio.h
int fputc(int ch,FILE *f){HAL_UART_Transmit(huart1,(uint8_t*)ch,1,0xffff);return ch;
}
int fgetc(FILE *f){uint8_t ch;HAL_UART_Receive(huart1,(uint8_t*)ch,1,0xffff);return ch;
}
那么主函数可以如下实现
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 *//* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE */printf(Hello World\t\n);HAL_Delay(500);/* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}**吐槽一下显示“%”只能用下面的方法
printf(%%);
printf(%c,%);
3.串口接收与发送
1)进行基本配置
除了上述配置外加入中断 2)编辑代码
触发中断时系统会调用定义于stm32f1xx_it.c的void USART1_IRQHandler(void) 可以看到该中断服务函数又调用 HAL_UART_IRQHandler(huart1),该函数定义于stm32f1xx_hal_uart.c中 在传输模式下该函数调用 UART_Receive_IT(huart);该函数同样定义于stm32f1xx_hal_uart.c中该函数调用可重定义函数 HAL_UART_RxCpltCallback(huart);并重定向printf及sprintf
#includestdio.h
int fputc(int ch,FILE *f){HAL_UART_Transmit(huart1,(uint8_t*)ch,1,0xffff);return ch;
}
int fgetc(FILE *f){uint8_t ch;HAL_UART_Receive(huart1,(uint8_t*)ch,1,0xffff);return ch;
}
#define RX_BUFFER_SIZE 50
uint8_t rxBuffer[RX_BUFFER_SIZE];//发送缓冲区
uint8_t rxData; //单字节接收数据
uint8_t txBuffer[RX_BUFFER_SIZE10];//发送还出去
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if (huart-Instance USART1) // 检查是否为 USART1{static uint16_t rxIndex 0;// 保存接收到的字节到缓冲区if (rxIndex RX_BUFFER_SIZE - 1) //确保不会写入超过缓冲区边界的位置{rxBuffer[rxIndex] rxData;// 如果接收到换行符表示消息结束if (rxData \n){rxBuffer[rxIndex] \0; // 添加字符串结束符// 拼接前缀并发送数据sprintf((char *)txBuffer, STM32 Received: %s, rxBuffer);printf(%s, txBuffer);rxIndex 0; // 重置接收缓冲区索引}}// 继续接收下一个字节HAL_UART_Receive_IT(huart1, rxData, 1);}
}
{/* 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, rxData, 1); //开启接收中断 参数为串口句柄、数据存储地址、接收字节数/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE *///uint8_t msg[]Hello World!\t\n;printf(Hello World!\t\n);while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}3)分析 HAL_UART_Receive_IT()很有趣不要忘了加两处
