请问一下这个程序，用USART3的传送数据有没有问题？？？
volatile u8 USART_Received_Flag=0;
u8 USART_RX_BUF[64]; //接收缓冲,最大64个字节.
//接收状态
//bit7，接收完成标志
//bit6，接收到0x0d
//bit5~0，接收到的有效字节数目
u8 USART_RX_STA=0; //接收状态标记
void uart_init(u32 bound){
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE); //使能UART3所在GPIOB的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //串口时钟配置
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Configure USART3 Rx (PB.11) as input floating
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器USART3
//USART 初始化设置
USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
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(USART3, &USART_InitStructure);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启中断
USART_Cmd(USART3, ENABLE); //使能串口
}
void USART3_SendBytes(u8 * str,u32 DataLen) //传送一组字符
{
while(DataLen)
{
delay_us(10);
USART_SendData(USART3, *str++);
while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);
DataLen--;
}
}
void USART3_IRQHandler(void) //串口3中断服务程序
{
u8 Res;
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
Res =USART_ReceiveData(USART3);//(USART3->DR); //读取接收到的数据
USART_RX_BUF[USART_RX_STA]=Res ;
USART_RX_STA++;
if(USART_RX_STA>63)
{
USART_RX_STA=0;//接收数据错误,重新开始接收
USART_Received_Flag=1;
}
}
} |
楼主
标题置顶
标题高亮
