一、硬件部分

开发板上的串口2连接到板载的st-link仿真器虚拟串口。

二、软件部分

2.1、配置串口

在STM32CubeMX软件中配置串口

串口2对应的引脚

配置完成后生成项目。

2.2、程序

项目生成后 ，生成的串口初始化代码

在main.c中添加串口printf有关的函数

/* USER CODE BEGIN PTD */
#if defined(__ICCARM__)
__ATTRIBUTES size_t __write(int, const unsigned char *, size_t);
#endif /* __ICCARM__ */

#if defined(__ICCARM__)
/* New definition from EWARM V9, compatible with EWARM8 */
int iar_fputc(int ch);
#define PUTCHAR_PROTOTYPE int iar_fputc(int ch)
#elif defined ( __CC_ARM ) || defined(__ARMCC_VERSION)
/* ARM Compiler 5/6*/
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#elif defined(__GNUC__)
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#endif /* __ICCARM__ */

/* USER CODE END PTD */

/* USER CODE BEGIN 4 */
PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART2 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, 0xFFFF);

  return ch;
}

#if defined(__ICCARM__)
size_t __write(int file, unsigned char const *ptr, size_t len)
{
  size_t idx;
  unsigned char const *pdata = ptr;

  for (idx = 0; idx < len; idx++)
  {
    iar_fputc((int)*pdata);
    pdata++;
  }
  return len;
}
#endif /* __ICCARM__ */


/* USER CODE END 4 */

2.3、主程序部分

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_USART2_UART_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Initialize leds */
  BSP_LED_Init(LED_GREEN);

  /* Initialize USER push-button, will be used to trigger an interrupt each time it's pressed.*/
  BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
        printf("stm32u083 uart2 printf test!\r\n");
        HAL_GPIO_TogglePin(LED4_GPIO_PORT, LED4_PIN);
    /* Insert delay 100 ms */
    HAL_Delay(100);
  }
  /* USER CODE END 3 */
}

三、程序运行

下载程序到开发板复位后，串口输出