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PUTCHAR_PROTOTYPE

Question asked by wang.albert on May 2, 2012
Latest reply on May 2, 2012 by Clive One
#ifdef __GNUC__
  /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
     set to 'Yes') calls __io_putchar() */
  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */

Can some one explain to me; what's the relationship between __io_putchar and fputc? are they from stand C library? and how it is related to printf() that is used in USART comunications? thanks a lot.

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