16f877a uart mikroc proteus help

[Rohith_elec]

my code for uart like below not working as expected in proteus

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;   }

        }
        }

 

[hexreader]

This tidied-up and fixed code works for me on real hardware:

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;
        }
    }
}

I have no idea about Proteus, as I never use it.

 

[Tahmid]

my code for uart like below not working as expected in proteus

What do you mean by not working as expected?

What do you expect?

What do you get?

 

[jayanth.devarayanadurga]

As mentioned by hexreader you should initialize UART only once in the void main() function. You should not put it in while(1) loop.

 

[Rohith_elec]

I want to use this inside a rover robot , just turn the motor using uart.
The uart connection restarts when the robot is moved forward and suddenly take backwards,
is this because the voltage variation caused when the motor is toggled suddenly ?

 

[jayanth.devarayanadurga]

If you are using the code posted in your first post it surely restart UART. Which code are you using? Post your Circuit.

 

[Rohith_elec]

Here is my new code

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;
        }

    }
}

 

[jayanth.devarayanadurga]

Your code seems OK. Post your circuit.

 

[Rohith_elec]

i am connecting the PIC pins to this L293D breakout board

 

[jayanth.devarayanadurga]

I cant understand the circuit in PCB layout. Post the Schematic.

 

[Rohith_elec]

Here is my schematic