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//初始化IO 串口3 //bound:波特率 void uart3_init(u32 bound){ //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDefUSART_InitStructure; NVIC_InitTypeDefNVIC_InitStructure; //APB2改为APB1,因为USART3是连接到APB1(低速外设)上的设备 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //??USART2,GPIOA?? RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //??USART2,GPIOA?? USART_DeInit(USART3); //复位串口3 //USART1_TX PB.10 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB.10 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化PB10
//USART1_RX PB.11 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入 GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化PB11
//USART 初始化设置
USART_InitStructure.USART_BaudRate= bound;//一般设置为9600; USART_InitStructure.USART_WordLength= USART_WordLength_8b;//字长为8位数据格式 USART_InitStructure.USART_StopBits= USART_StopBits_1;//一个停止位 USART_InitStructure.USART_Parity= USART_Parity_No;//无奇偶校验位 USART_InitStructure.USART_HardwareFlowControl= USART_HardwareFlowControl_None;//无硬件数据流控制 USART_InitStructure.USART_Mode= USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART3, &USART_InitStructure); //初始化串口 //Usart3 NVIC 配置 NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority= 0; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd= ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启中断 USART_Cmd(USART3, ENABLE); //使能串口
}
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