现在usart2发送接收正常，usart3只能发送不能接收

wuyiee · 发表于 2014-11-8 08:39:13

我的usart3的代码是usart2复制过来的，修改了RCC以及定时器，现在usart2发送接收正常，usart3只能发送不能接收，请帮忙看看什么问题

初始化代码如下
//初始化IO 串口3
//bound:波特率
void USART3_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//使能GPIOB时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);//使能USART3时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;//PB11
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOB, &GPIO_InitStructure);

RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3,ENABLE);//复位串口3
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3,DISABLE);//停止复位

USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位数据长度
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;///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

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //使能串口3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级2级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
TIM3_Init(999,7199); //100ms中断
USART3_RX_STA=0; //清零
TIM3_Set(1); //关闭定时器3
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启中断
USART_Cmd(USART3, ENABLE); //使能串口
}