51 MCU implements printf-EEWORLD

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When the printf function formats the output, it calls the char putchar(char c); function. This function can be found in "stdio.h", so we need to construct such a function ourselves, that is, through the serial port putchar(), the code is as follows:

char putchar(char c) // redirect

{

Uart_SendChar(c);

return c;

}

void Uart_SendChar(unsigned char dat)

{

SBUF = dat;

while(!IF);

IF = 0;

}

Then after the serial port is initialized, include the "stdio.h" header file and you can use the printf function.

NOTE:

Using the printf function in the stdio library will increase the amount of code by about 1k, so use it with caution in a small-capacity 51 microcontroller! !

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