CubeMX完成STM32F103双串口485收发透传
一、硬件电路
STM32F103AEVT6基本电路；选择串口1、串口2；串口2通过485接口输出，控制端是PC9端口，PC9=1时接收，0时发送。
二、CubeMX完成配置，生成工程
配置时钟、调试模式、IO、串口1、串口2参数、打开串口中断。
三、Keil添加代码，完成功能
/* USER CODE BEGIN PV */
//接收状态，完毕标志为1；处于接收状态则为0
uint8_t uart1Rxstate=0;
//当前接收的字节总数
uint8_t uart1RxCounter=0;
//接收缓冲
uint8_t uart1RxBuff[128]={0};
//uart2接收
//接收状态，完毕标志为1；处于接收状态则为0
uint8_t uart2Rxstate=0;
//当前接收的字节总数
uint8_t uart2RxCounter=0;
//接收缓冲
uint8_t uart2RxBuff[128]={0};
void USER_UART2_IRQHandler(void);
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
int fputc(int ch,FILE *f)
{
HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,0xffff);
return ch;
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
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();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
//开串口中断
__HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);
__HAL_UART_ENABLE_IT(&huart2,UART_IT_RXNE);
//串口2 485接收使能
HAL_GPIO_WritePin(RS485_TX_EN_PORT, RS485_TX_EN_PIN, GPIO_PIN_RESET);
printf("Test UART1 out Hello STM32!");
char tr2[]="UART2 transmit sentence for test !";
HAL_Delay(500);
HAL_GPIO_WritePin(RS485_TX_EN_PORT, RS485_TX_EN_PIN, GPIO_PIN_SET);
HAL_UART_Transmit(&huart2,(uint8_t *)&tr2,sizeof(tr2),0xffff);
HAL_GPIO_WritePin(RS485_TX_EN_PORT, RS485_TX_EN_PIN, GPIO_PIN_RESET);
HAL_Delay(500);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
// 串口1接收到数据，串口2输出
if(uart1Rxstate==1)
{
HAL_GPIO_WritePin(RS485_TX_EN_PORT, RS485_TX_EN_PIN, GPIO_PIN_SET);
HAL_UART_Transmit(&huart2,(uint8_t *)&uart1RxBuff,uart1RxCounter,0xffff);
HAL_GPIO_WritePin(RS485_TX_EN_PORT, RS485_TX_EN_PIN, GPIO_PIN_RESET);
memset(uart1RxBuff,0,128);
uart1Rxstate=0;
uart1RxCounter=0;
}
// 串口2接收到数据，串口1输出
if(uart2Rxstate==1)
{
HAL_UART_Transmit(&huart1,(uint8_t *)&uart2RxBuff,uart2RxCounter,0xffff);
memset(uart2RxBuff,0,128);
uart2Rxstate=0;
uart2RxCounter=0;
}
}
/* USER CODE END 3 */
}
四、串口调试工具调试测试
利用串口调试工具调试。