STM32 UART1 的引脚复用怎么定义

STM32 UART1 的引脚复用怎么定义

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 RX

GPIO_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);