STM32UART1的引脚复用怎么定义

问题描述

精选答案

GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStruct;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//使能GPIOA的时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);//使能USART的时钟 GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);//配置PA9成第二功能引脚 TX GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);//配置PA10成第二功能引脚RXGPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 115200;//波特率 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); //使能接收中断 USART_Cmd(USART1, ENABLE); //使能USART1 NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStruct.NVIC_IRQChannelPriority = 0x02; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStruct);