STM32 principles and methods used to achieve printf print serial data

The principle used STM32 printf print serial data In the C library, printf () function and the like are in the output stream STM32 register, can be realized by use of fputc printf () function to achieve this, so we remapped through, make it output a modified definition of the function () function on the data output serial STM32. Take inventory implement printf () function prints a string to redefine methods USART1 method one Add 1 contains printf () function in the header file: #include "stdio.h" 2. override int fputc stdio.h header file (int ch, FILE * f) function 3. The function "int fputc (int ch, FILE * f)" on the main () function can be called in the file, KEIL- "Options for Target'xxx '-" Target- "Code Generation, check Use MicroLIB Method Two // add the following code to support the printf function, without the need to select the use MicroLIB #if 1 #pragma import (__use_no_semihosting) // standard library functions need support struct __FILE { int handle; } FILE __stdout; // define _sys_exit () in order to avoid the use of semi-host mode _sys_exit (int x) { x = x; } // function to redefine fputc int fputc (int ch, FILE * f) { while (! (USART1- "SR & (1" "7))); USART_SendData (USART1, (uint8_t) ch); Return ch; } #ENDIF Integration from: CSDN dust of the world, Foresights Edit: jq, Read more

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