Hal library serial port for note taking

Serial port settings

Code configuration

#include "dr_debug.h"

// Redirect c Library function printf To serial port , After resetting, you can use printf function 
int fputc(int ch, FILE *f)
{
    
#if DEBUG_ENABLE
    while ((DEBUG_USARTx->SR & 0X40) == 0)
    {
    
    }
    DEBUG_USARTx->DR = (uint8_t)ch;
    return ch;
#endif
}

/// Redirect c Library function scanf To serial port , Override backward to use scanf、getchar Such as function 
int fgetc(FILE *f)
{
    
#if DEBUG_ENABLE
    while (((DEBUG_USARTx->SR) & 0x20) == 0)
    {
    
    }
    return (uint8_t)DEBUG_USARTx->DR;
#endif
}

int DEBUG_Info(const char *format, ...)
{
    
  int retval=0;
#if DEBUG_ENABLE
    va_list ap;
  
    va_start(ap, format);
    printf("DEBUG>");
    retval = vprintf(format, ap);
    va_end(ap);
    
#endif
    return retval;
}

The header file

#ifndef _DR_DEBUG_H_
#define _DR_DEBUG_H_
#include <stdio.h>
#include <stdarg.h>
#include "main.h"
#include "stm32f1xx_hal.h"
#define DEBUG_ENABLE 1
#define DEBUG_USARTx USART1
int DEBUG_Info(const char *format, ...);
#endif // _DR_DEBUG_H_