摘要： 在STM32工程中调用printf函数，需要加入如下代码：#ifdef __GNUC__ /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() */ #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)#else #define PCHAR_PROTOTYPE int fputc(int ch, FILE *f)#endif /* __GNUC_ 阅读全文