1.?開(kāi)時(shí)鐘 GPIO UART

2.?配置GPIO，復(fù)用UART 的RX、TX

3.?配置UART結(jié)構(gòu)體

4.?中斷接收

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1.?開(kāi)時(shí)鐘 GPIO UART

?RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

?RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

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2.?配置GPIO，復(fù)用UART 的RX、TX

//發(fā)送引腳

????GPIO_InitTypeDef GPIO_InitStruct;

????GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;//復(fù)用推挽輸出

????GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;

????GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

????GPIO_Init(GPIOA,&GPIO_InitStruct);

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????//接收引腳

????GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;//上拉輸入

????GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;

????GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

????GPIO_Init(GPIOA,&GPIO_InitStruct);

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3.?配置UART結(jié)構(gòu)體

//配置USART參數(shù)

????USART_InitTypeDef USART_InitStruct;

????USART_InitStruct.USART_BaudRate = 9600;

????USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

????USART_InitStruct.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;

????USART_InitStruct.USART_Parity = USART_Parity_No;

????USART_InitStruct.USART_StopBits = USART_StopBits_1;

????USART_InitStruct.USART_WordLength = USART_WordLength_8b;

USART_Init(USART1,&USART_InitStruct);

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4.?中斷接收，配置中斷參數(shù)

//串口USART_IT_RXNE位（接收移位寄存器） 置1 觸發(fā)中斷

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

//配置NVIC

????NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//優(yōu)先級(jí)分組

????NVIC_InitTypeDef NVIC_InitStruct;

????NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;

????NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

????NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;

????NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;

NVIC_Init(&NVIC_InitStruct);

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5.串口使能（上電）

????USART_Cmd(USART1,ENABLE);

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