First, please check "UseMicroLIB" in "Target"->"Code Generation" of MDK (keil) project properties.
Add Printf to your program
1,#include
2. Add
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE
{
USART_SendData(USART1, (uint8_t) ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
{}
return ch;
}
3.
Add in Main()
USART_Configuration()
transfer
printf("The is an example!" );
Output functions like
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