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Problem with USART on NUCLEO-F401RE

Question asked by stastny.petr on Aug 17, 2016
Latest reply on Aug 17, 2016 by Clive One
Hello,
I wrote my first project on Nucleo-F401RE with USART but not working. I do not see any problem there, can you help me please to find some mistake?
Thank you very much

#include "main.h"
 
static void COMInit(void);
 
#ifdef __GNUC__
  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
 
int main(void)
{
 
  COMInit();
        
  while (1)
  {
        printf("\n\rUSART TEST\n\r");
  }
}
 
void COMInit(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
     
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); 
 
  /* Configure USART Tx as alternate function  */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
     
      /* Connect PXx to USARTx_Tx*/
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
     
  /* Configure USART Rx as alternate function  */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  /* Connect PXx to USARTx_Rx*/
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
     
  /* USART2 Config */
     
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
 
  /* USART configuration */
  USART_Init(USART2, &USART_InitStructure);
     
  /* Enable USART */
  USART_Cmd(USART2, ENABLE);
}
 
PUTCHAR_PROTOTYPE
{
  USART_SendData(USART2, (uint8_t) ch);
  while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET) {}
  return ch;
}
 
#ifdef  USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
  while (1)
  {
  }
}
#endif

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