STM32CubeMX,printf实现。 代码附上: #include #ifdef __GNUC__ #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #else #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f) #endif PUTCHAR_PROTOTYPE { HAL_UART_Transmit(&huart3 , (uint8_t *)&ch, 1, 0xFFFF); return ch; }