How to retarget printf() on an STM32F10x?

Question

I use this code for retarget printf(), but it does not work

#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->         


        

Answer 1

just make sure to add the following in the init code:

// Turn off buffers, so I/O occurs immediately
setvbuf(stdin, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);