STM8 uses printf instead of uart method-EEWORLD

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Add in the program: (the header file needs to add #include )

#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE
{
//Send data code
return ch;
}

The message identifier "FILE" is undefined appears. In the project options, select the following:

You need to set the function library in IAR's Options -> General Options -> Library Configuration, otherwise the printf function will be incorrect. Just change the Library setting in Library Configuration from "Normal" to "Full".

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