STM32系列--串口收发+基本定时器

        if(myusart.reflag>0)
        {                    
            Com_Handle();        
            myusart.recount=0;   
            myusart.reflag=0;                
        }

#define _maxbuf 100

typedef struct
{
 u8 myadd;
 u8 rcbuf[_maxbuf];
 u16 timout;
 u8 recount;
 u8 timrun;
 u8  reflag;
 u8 Sendbuf[_maxbuf]; /
 u8 flag;
}MYUSART;
extern MYUSART myusart;

YUSART myusart;

u16 tdat=0;
u16 tflag=0;

void TIME4_Init(u16 arr,u16 psc)
{
 
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //时钟使能

    TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值     计数到5000为500ms
    TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率  
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
    TIM_ITConfig(  //使能或者失能指定的TIM中断
        TIM4, //TIM2
        TIM_IT_Update ,
        ENABLE  //使能
        );
    NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;  //TIM3中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
    NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
    TIM_Cmd(TIM4, ENABLE);  //使能TIMx外设
}

void TIM4_IRQHandler(void)   //TIM3中断 1MS
{
    u8 st;
    if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源 
    {      
        st= TIM_GetFlagStatus(TIM4, TIM_FLAG_Update);    
        if(st==SET)
        {
          TIM_ClearFlag(TIM4, TIM_FLAG_Update);
            
            tdat++;
            
            if(!(tdat&0x0F)) //16MS
            {
                tflag |= _bit(1);
            }
            
            if(myusart.timout>0)
            {
                if(--myusart.timout==0)
                {
                    myusart.reflag=1;  //收到一帧数据
                }
            }            
        }    
        TIM_ClearITPendingBit(TIM4, TIM_IT_Update  );  //清除TIMx的中断待处理位:TIM 中断源 
    }
}

void USART1_IRQHandler(void)                    //串口1中断服务程序
    {
     u8 sbuf;
#ifdef OS_TICKS_PER_SEC         //如果时钟节拍数定义了,说明要使用ucosII了.
    OSIntEnter();    
#endif
        if (USART_GetFlagStatus(USART1, USART_FLAG_ORE) != RESET)//注意！不能使用if(USART_GetITStatus(USART1, USART_IT_RXNE) != sbufET)来判断  
        {  
                sbuf=USART_ReceiveData(USART1);  
        } 
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0xbb 结尾)
    {
        sbuf =USART_ReceiveData(USART1);//(USART1->DR);    //读取接收到的数据
        
        if( myusart.reflag==0)
        {
            myusart.timout=10;
            if(myusart.recount<_maxbuf) 
            {
                myusart.rcbuf[myusart.recount++]=sbuf;
            }
        }

        
#if 0    
        if( myusart.reflag==1)  //有数据包正在处理
        {
            return ;
        }             
        myusart.rcbuf[myusart.recount++]=sbuf;
        myusart.timout=0;  
        if(myusart.recount==1)  //收到主机发来的一帧数据的第一字节
        {
            myusart.timrun=1;  //启动定时
        }
#endif
        
        USART_ClearITPendingBit(USART1,USART_IT_RXNE);            
        
    }