STM32F401RET6 LQFP64 (Nucleo-F401RE) uart 打印输出

1.STM32F401RET6 芯片情况

2.板子硬件

电源部分，开发板可利用JP5跳帽座子来选择使用USB供电或者使用管脚座子的外部Vin进行供电，无论是哪种供电，都需要经过U4的5V转成3.3V的LDO的再给STM32供电。

电路原理图，分为四部分：整体框架图、MCU的电路图、STLINK电路图、连接座管脚图。

2.1 连接座子 PIN含义

2.2 UART配置

  */
int main(void)
{
  /* STM32F4xx HAL library initialization:
       - Configure the Flash prefetch, instruction and Data caches
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Global MSP (MCU Support Package) initialization
     */
  HAL_Init();
  
  /* Configure the system clock to 84 MHz */
  SystemClock_Config();
   
  /*##-1- Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* UART1 configured as follow:
      - Word Length = 8 Bits
      - Stop Bit = One Stop bit
      - Parity = ODD parity
      - BaudRate = 9600 baud
      - Hardware flow control disabled (RTS and CTS signals) */
  UartHandle.Instance          = USARTx;
  
  UartHandle.Init.BaudRate     = 115200;//9600;
  UartHandle.Init.WordLength   = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits     = UART_STOPBITS_1;
  UartHandle.Init.Parity       = UART_PARITY_NONE;//UART_PARITY_ODD;
  UartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode         = UART_MODE_TX_RX;
  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
    
  if(HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(); 
  }
  
  /* Output a message on Hyperterminal using printf function */
 printf("\n\r UART Printf Example: retarget the C library printf function to the UART\n\r");
	//printf("ABCD\n\r");
  /* Infinite loop */ 
  while (1)
  {
		 printf("ABCD\n\r");
		  //printf("\n\r UART Printf Example: retarget the C library printf function to the UART\n\r");
  }
}

2.3 UART 2 默认连接到 ST LINK

2.3.1 ST LINK虚拟UART打印乱码

  UartHandle.Init.Parity       = UART_PARITY_NONE;//UART_PARITY_ODD;

UART打印终端与MCU UART配置不一致

改成无校验即可

2.4 MCU 自身的UART2 接口D1 D0无法 打印输出

短接SB63即可

3.参考

本地电脑工程路径：

D:\st mcu\STM32F401RE Nucleo-64开发板\stm32cube_fw_f4_v1260\STM32Cube_FW_F4_V1.26.0\Projects\STM32F401RE-Nucleo\Examples\UART\UART_Printf\MDK-ARM

32cube_fw_f4_v1260\STM32Cube_FW_F4_V1.26.0\Projects\STM32F401RE-Nucleo\Examples\UART\UART_Printf\MDK-ARM

超低功耗新标准——Nucleo-L073RZ评测 https://www.21ic.com/evm/evaluate/MCU/2016