1. Include header files
#include "stdio.h"
2. Redefine the serial port
int fputc( int ch, FILE * f) { while ((USART1->SR & 0X40 ) == 0 ); // Send in a loop until the sending is complete USART1->DR = (uint8_t) ch; return ch; }
3. If only the first two steps are completed, the emulator can be used to run, but the program cannot run by itself. Also add the following code
#pragma import(__use_no_semihosting)
void _sys_exit(int x)
{
x = x;
}
struct __FILE
{
int handle;
/* Whatever you require here. If the only file you are using is */
/* standard output using printf() for debugging, no file handling */
/* is required. */
};
FILE __stdout; /* FILE is typedef’ d in stdio.h. */
This setting can avoid using the LIB library
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