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void USART1_Config(void){ GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); 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(USART1, &USART_InitStructure); USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); USART_ClearFlag(USART1,USART_FLAG_TC);//清除USARTx的待处理标志位 USART_Cmd(USART1, ENABLE);} void USART_SendData(USART_TypeDef* USARTx, uint16_t Data){ /* Check the parameters */ assert_param(IS_USART_ALL_PERIPH(USARTx)); assert_param(IS_USART_DATA(Data)); /* Transmit Data */ USARTx->DR = (Data & (uint16_t)0x01FF); // 发1. 将数据放进寄存器}int fputc(int ch, FILE *f){ /* 发送一个字节数据到USART1 */ USART_SendData(USART1, (uint8_t) ch); /* 等待发送完毕 */ while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); //发2. 放入寄存器,然后开始发送,发送完成,为 SET(1) return (ch);} uint16_t USART_ReceiveData(USART_TypeDef* USARTx){ /* Check the parameters */ assert_param(IS_USART_ALL_PERIPH(USARTx)); /* Receive Data */ return (uint16_t)(USARTx->DR & (uint16_t)0x01FF); // 收2. 然后 从寄存器读取数据}/// 重定向c库函数scanf到USART1int fgetc(FILE *f){ /* 等待串口1输入数据 */ while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET); // 收1. 来数据之后会将 寄存器 SET(置1) return (int)USART_ReceiveData(USART1); //} 转载地址：http://yaigi.baihongyu.com/