[mw_shl_code=c,true]#include "usart.h" void USART1_Config() { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA , ENABLE); //?ò??PE?±?? RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 , ENABLE); //?ò???®???±?? //Tx GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //?è?????????? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //IO·?×?????50MHz GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //?è?????????????? GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); //Rx GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; //?è?????????? GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART2,&USART_InitStructure); USART_Cmd(USART2,ENABLE); } int fputc(int ch ,FILE *f) { USART_SendData(USART2, (unsigned char)ch); while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET); return(ch); } void USART_Send(uint8_t *f) { while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET); USART_SendData(USART2, *f); f++; } void USART_Send_bate(uint8_t bate) { while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET); USART_SendData(USART2, bate); } 需要勾选use MicroLIB 然后主程序可以直接使用printf输出[/mw_shl_code]