led+串口代码重定向STM32F030F4P6fgetcmultiplydefined错误

led+串口 重定向 STM32F030F4P6 重定向报错 axf: Error: L6200E: Symbol fgetc multiply defined (by usart.o and main.o).

把

#include "stdio.h" int fputc(int ch, FILE *fp) { HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xffff); return ch; } int fgetc(FILE *fp) { uint8_t ch = 0; HAL_UART_Receive(&huart1, &ch, 1, 0xffff); return ch; }

放在main.c 开头/* USER CODE BEGIN PV */就可以了