16f877a uart mikroc proteus help

char  receive ;



void main() {
    CMCON |= 7;
    TRISA = 0x04;                    // RA2 is analogue input
    ADCON1 = 0x80;
    TRISD =0;                       //
    PORTD=0x00;



    while (1) {



        UART1_Init(9600);               // Initialize UART1 module at 9600 bps
        Delay_ms(100);                  // Wait for UART 1module to stabilize
        UART1_Write_Text("Start");
        UART1_Write(13);
        UART1_Write(10);



        while (!UART1_Data_Ready());        // wait for UART character in buffer
        {receive = UART1_Read();
        if (receive == 'a')
        {
        portd=0x00;
         portd.f0=0;
         portd.f1=0;
         portd.f2=1;

         }

       if (receive == 'b')
          portd=0x00;
         portd.f0=1;
         portd.f1=1;
         portd.f2=1;   }

        }
        }

char  receive ;

void main(){
    CMCON |= 7;                         // turn off comparator
    TRISA = 0x04;                       // RA2 is analogue input
    ADCON1 = 0x80;
    TRISD = 0;                          //
    PORTD = 0x00;

    UART1_Init(9600);                   // Initialize UART1 module at 9600 bps
    Delay_ms(100);                      // Wait for UART 1module to stabilize
    UART1_Write_Text("Start\r\n");

    while (1) {
        while (!UART1_Data_Ready());        // wait for UART character in buffer

        receive = UART1_Read();

        if (receive == 'a'){
            PORTD = 0x04;
        }

        if (receive == 'b'){
            PORTD = 0x07;
        }
    }
}

char  receive ;

void main(){
    CMCON |= 7;                         // turn off comparator
    TRISA = 0x04;                       // RA2 is analogue input
    ADCON1 = 0x80;
    TRISD = 0;                          //
    PORTD = 0x00;

    UART1_Init(9600);                   // Initialize UART1 module at 9600 bps
    Delay_ms(100);                      // Wait for UART 1module to stabilize
    UART1_Write_Text("Start\r\n");

    while (1) {
        while (!UART1_Data_Ready());        // wait for UART character in buffer

        receive = UART1_Read();

        if (receive == 'f'){
            PORTD = 0x2D;
            
        }

        if (receive == 'b'){
            PORTD = 0x1B;
        }
        
         if (receive == 'r'){
            PORTD = 0x2B;
        }
        
         if (receive == 'l'){
            PORTD = 0x1D;
        }

    }
}