1.配置芯片，如果PA9,PA10的UART引脚被占用，会自动进行重映射

2.代码

int main(void)
{uint8_t temp[]="test";/* 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){HAL_UART_Transmit(&huart1,temp,5,50);//结构体，发送的数据，长度，发送时间/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}