How does printf and scanf connect to fputc and fgetc ?

Hi. I came across that fputc() is connected with printf() and fgetc is connected with scanf() in cortex-m3 uVision Keil firmware program. But I can't find exactly how does it connect between...
How does printf and scanf connect to fputc and fgetc ?

Hi. I came across that fputc() is connected with printf() and fgetc is connected with scanf() in cortex-m3 uVision Keil firmware program. But I can't find exactly how does it connect between...
override symbol feature for fputc does not work correctly

I want to retarget the fputc library function so that I can have it both write to a uart (when used with printf) and write to a file (when used with fwrite). The override symbol feature of the compiler...
override symbol feature for fputc does not work correctly

I want to retarget the fputc library function so that I can have it both write to a uart (when used with printf) and write to a file (when used with fwrite). The override symbol feature of the compiler...
GCC+Keil printf cann't retarget to uart

HI,I Want use gun in keil.now,Can't output debug log to uart.I have implement fputc like this: int fputc(int ch, FILE *f) { if (s_debugInit) { UART_SendData(DEBUG_UART, ch); } return ch; } but when...