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//初始化IO 串口3 //bound:波特率 void uart3_init(u32 bound){ //GPIO端口設置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDefUSART_InitStructure; NVIC_InitTypeDefNVIC_InitStructure; //APB2改為APB1,因為USART3是連接到APB1(低速外設)上的設備 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //??USART2,GPIOA?? RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //??USART2,GPIOA?? USART_DeInit(USART3); //復位串口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; //復用推挽輸出 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;//浮空輸入 GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化PB11
//USART 初始化設置
USART_InitStructure.USART_BaudRate= bound;//一般設置為9600; USART_InitStructure.USART_WordLength= USART_WordLength_8b;//字長為8位數據格式 USART_InitStructure.USART_StopBits= USART_StopBits_1;//一個停止位 USART_InitStructure.USART_Parity= USART_Parity_No;//無奇偶校驗位 USART_InitStructure.USART_HardwareFlowControl= USART_HardwareFlowControl_None;//無硬件數據流控制 USART_InitStructure.USART_Mode= USART_Mode_Rx | USART_Mode_Tx; //收發模式
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;//搶占優先級3 NVIC_InitStructure.NVIC_IRQChannelSubPriority= 0; //子優先級3 NVIC_InitStructure.NVIC_IRQChannelCmd= ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根據指定的參數初始化VIC寄存器
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//開啟中斷 USART_Cmd(USART3, ENABLE); //使能串口
}
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