Serial port receiving example - idle interrupt

//First look at 51

void UARTInterrupt(void) interrupt 4

{

    if(RI)

    {

        RI = 0;

        UsartReceive[UsartReadCnt] = SBUF;

        UsartReadCnt++;

        if(UsartReadCnt > ReadLength-2) //Prevent overflow

        {

            UsartReadCnt = 0;

        }

    }

}

void Timer0Interrupt(void) interrupt 1

{

    TH0 = (65536 - 5000) / 256;

    TL0 = (65536 - 5000) % 256; //timing 5ms

    if(UsartReadCnt != 0) //Received data

    {

        if(UsartIdleCnt == UsartReadCnt)

        {

            UsartReadCntCopy = UsartReadCnt;

            UsartReadCnt = 0;

            UsartIdleCnt = 0;

            UsartFlag = 1;

        }

        else

        {

            UsartIdleCnt  = UsartReadCnt;

        }   

    }

}

...

if(UsartFlag == 1)

{

    UsartFlag = 0;

    ...

}

...

//STM32

void USART1_IQRHandler(void)

{

    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)//Indicates that data has been received

    {

        Usart1ReadBuff[Usart1ReadCnt++] = USART_ReceiveData(USART1);

        if(Usart1ReadCnt > UsartReadLen - 10)

        {

            Usart1ReadCnt = 0;

        }

    }

}

void TIM2_IRQHandler(void)

{

    if(TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)

    {

        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        if(Usart1ReadCnt != 0)

        {

            if(Usart1ReadCnt == Usart1IdleCnt)

            {

                Usart1ReadCntCpoy = Usart1ReadCnt;

                Usart1ReadCnt = 0;

                Usart1IdleCnt = 0;

                Usart1ReadFlag = 1;

            }

        }

    }

}

...

if(Usart1ReadFLag == 1)

{

    Usart1ReadFlag = 0;

    ...

}

...