Hi all,

I am trying to interface pic to pic via uart. i have created code so that when the pushbutton is pressed, the pic would send signal to the other pic and turn the led but its not working. i have tried using the rf modules but i have heard that in order to make it easy. i must just connec the tx with the rx and its good to go.
im using pic16f877a and programming on mikroc

here is the transmitter code:

void main() {
     char txt = 'A';
    TRISA.F0 = 1;
    PORTA.F0 = 0;
  
    UART1_Init(2400);
    Delay_ms(200);
    while (1){
    if(PORTA.F0 == 1){
    delay_ms(100);
    if (UART1_Tx_Idle() == 1) {
     UART1_Write('A');
    }
    }
   }


}

this is recieved code:

void main() {
     char output;
    TRISB.F0 = 0;
    PORTB.F0 = 0;

    UART1_Init(2400);
    Delay_ms(200);
    while (1){
    if (UART1_Data_Ready() == 1) {          // if data is received
     output = UART1_Read();
    if (output == 'A'){
               PORTB.F0 = 1;
    }
                                   }

    }

}

Moderator edit: added code tags

 

pic 1 tx connect to pic 2 rx
pic 1 rx connected to pic 2 tx

 

i done that but it doesnt work?

 

Hello,

Are the ground connections also joined between pic1 and pic2?

Bertus

 

Have you tested them coupled together? or is the distance to great?
Oops I see you did in post 3?
Max.

 

why would i ground pic1 with pic2 when im doing it wirelessly...i have set a distance between them approx 2metres and that doest help either

 

Hello,

I was responding on posts #2 and #3, as wired connection between the pics, so you can check the code.

Bertus

 

why would i ground pic1 with pic2 when im doing it wirelessly...i have set a distance between them approx 2metres and that doest help either

As others have pointed out, you should try a direct connection first and get that working before you go on to RF links. If it does not work directly it won't work with the extra complexity of an RF module.

Your code does not show that you have initialized ADCON1. That is necessary to be able to read RA0 as a digital input.

 

it is working directly so now im working with the rf modules but its just not working. do i have to put anything extra in the code for that to work? im using the following rf transmitter and reciever
http://oap.sourceforge.net/datasheets/rf.pdf

 

You should post your schematics of your circuits.
Have you try to bring them closer to each other?