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// The refrigeration temperature test, setting the temperature through the screen, through the measurement display current temperature.

#include

#include

sbit RTR1=P1^0;/*Refrigeration temperature relay stops cooling after reaching the set temperature.*/

unsignedchar data_start,data_ok,RX5A,RXA5,RXLEN,RXCMD,RXADRH,RXADRL,RXDLEN,TXTIME;

unsignedchar RX_BUF[2]; /*Reads the SET data variable buffer (0x83 instruction) 2Byte  variable data. */

unsignedchar TX_BUF[16]={0x5A,0xA5,0x05,0x83,0x10,0x00,0x00,0x01,

// Read data register port 0x83 corresponding to address 0x1000 address.

0x5A,0xA5,0x05,0x82,0x00,0x00};

/*Write data register (0x82 instruction), write 2Byte variable data, corresponding to 0x0000 address*/

unsignedchar TX_CNT,RX_CNT;//send and receive buffer pointer position.

void main(void)

{

int temp_s,temp_c;

//The power is initialized

    PCON=PCON|0x80;/*Configure serial port baud rate clock is 22.1184bps, baud rate is 115200bps*/

    SCON=0x50;// Receive mode 1, allow serial port to receive.

    TMOD=0x21;//Timer 1  mode 2, timer 0 mode 1.

    TH1=255;

    TL1=255;

    TR1=1;

    TH0=0xB8;//10ms timed interruption , calculation //(2^16-0xB800)*12*1/(22.1184*10^6)=0.01

    TL0=0x00;

    TR0=1;

    TXTIME=100;//Start sending data after 1s.

    data_start=0;

    data_ok=0;

    RTR1=1;//Turn on the refrigeration relay on the power supply.

    ES=1;

    ET0=1;

    EA=1;

while(1)

{

        temp_c=Readtemp();//Reads the current measurement temperature

if(data_ok==0xff)

{

            data_ok=0;

            temp_s=RX_BUF[0]*256+RX_BUF[1];// Read the set temperature

}

if(temp_c>temp_s)// By comparing the On-off relays

            RTR1=0;

else

            RTR1=1;

        TX_BUF[14]=temp_c/256;// Displays the current temperature value send buffer

        TX_BUF[15]=temp_c%256;

}

}

//Measure the temperature function

int Readtemp(void)

{

    return20;// Here for the user to write temperature test program, here only return constant.

}

void Time0_interrupt(void)interrupt2

{

    TF0=0;// Clears the interrupt flag bit

    TH0=0xB8;

    TL0=0x00;

    TXTIME--;

if(TXTIME==0)

{

        TXTIME=20;// 200ms send once

        TX_CNT=0;

        TI=0;

        SBUF=TX_BUF[0];//TI = 1;

}

}

void Uart_interrupt(void)interrupt4

{

unsignedchar temp;

if(RI)

{

        temp=SBUF;

        RI=0;

if(data_start==0)

{

            RX5A=RXA5;

            RXA5=RXLEN;

            RXLEN=RXCMD;

            RXCMD=RXADRH;

            RXADRH=RXADRL;

            RXADRL=RXDLEN;

            RXDLEN=temp;

// Check synchronization frame data

if((RX5A==0x5A)&&(RXA5==0xA5)&&(RXLEN==0x08)&&(RXCMD==0x83)

&&(RXADRH=0x10)&&(RXADRL=0x00)&&(RXDLEN=0x01))

{

                data_start=0xff;

                RX_CNT=0;

}

}

else

{

            RX_BUF[RX_CNT]=temp;

            RX_CNT++;

if(RX_CNT==2)

{

                data_start=0;

                data_ok=0xff;

}

}

}

if(TI)// Send interrupt

{

            TI=0;

            TX_CNT++;

if(TX_CNT<16)

{SBUF=TX_BUF[TX_CNT];}//TI = 1;

}

}