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void uart2_tips(void)
{
if(USART2_RX_STA&0x8000)
{
len=USART2_RX_STA&0x3fff; //得到此次接收到的数据长度
printf("\r\n您发送的USART2消息为:\r\n\r\n");
for(t=0;t<len;t++)
{
USART_SendData(USART1, USART2_RX_BUF[t]);//向串口1发送数据
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//等待发送结束
}
command_operate(USART2_RX_BUF,USART2_RX_STA);
printf("\r\n\r\n");//插入换行
USART2_RX_STA=0;
}else
{
times++;
if(times%5000==0)
{
printf("\r\nSTM32 USART2\r\n");
}
delay_ms(10);
}
}
void USART2_IRQHandler(void) //串口1中断服务程序
{
u8 Res;
#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真,则需要支持OS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
Res =USART_ReceiveData(USART2); //读取接收到的数据
if((USART2_RX_STA&0x8000)==0)//接收未完成
{
if(USART2_RX_STA&0x4000)//接收到了0x0d
{
if(Res!=0x24)USART2_RX_STA=0;//接收错误,重新开始
else USART2_RX_STA|=0x8000; //接收完成了
}
else //还没收到0X0D
{
if(Res==0x24)
USART2_RX_STA|=0x4000;
else
{
USART2_RX_BUF[USART2_RX_STA&0X3FFF]=Res ;
USART2_RX_STA++;
if(USART2_RX_STA>(USART_REC_LEN-1))USART2_RX_STA=0;//接收数据错误,重新开始接收
}
}
}
}
#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真,则需要支持OS.
OSIntExit();
#endif
}
void uart2_init(u32 bound){
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能USART1,GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
//USART1_TX GPIOA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
//USART1_RX GPIOA.10初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10
//Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //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 初始化设置
USART_InitStructure.USART_BaudRate = bound;//串口波特率
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(USART2, &USART_InitStructure); //初始化串口1
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断
USART_Cmd(USART2, ENABLE); //使能串口1
}