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How can I send and receive 16 bits of data between two PICs

 
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arloedx



Joined: 21 Aug 2009
Posts: 15
Location: Texas

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How can I send and receive 16 bits of data between two PICs
PostPosted: Mon Oct 05, 2009 10:01 am     Reply with quote
I would like to send and receive 16 bits of data from one PIC to another but I'm not sure how to go about doing this. I was thinking of using fputc from rs232 but I only see in the options the ability to send and receive 9 bits using long_data and setting the bits=9. Any suggestions? Thanks.
kdoney34711



Joined: 05 Oct 2009
Posts: 6

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PostPosted: Mon Oct 05, 2009 10:16 am     Reply with quote
Do you have to use any specific pics and does it have to be in one transfer?
Code:

// PSPMASTER.C

#include "16F877A.h"

void main()
{
    int sendbyte;

    port_b_pullups(1);

    while(1)
    {   sendbyte = input_B();
        output_D(sendbyte);

        output_low(PIN_E2);
        output_low(PIN_E1);
        output_high(PIN_E1);
    }
}

// PSPSLAVE.C

#include "16F877A.h"

void main()
{
    int recbyte;

    setup_psp(PSP_ENABLED);
   
    while(1)
    {   if(psp_input_full())
        {   recbyte = input_D();
            output_C(recbyte);
        }
    }
}



Of course if it must be in one transfer you will need more ports.
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KDONEY
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Mon Oct 05, 2009 4:47 pm     Reply with quote
Serial data is usually sent in bytes. That is how hardware UARTs are constructed. The 9th bit, parity bit, etc. are special and not generally expandable to 16 bits.

To send 16 bits just use two byte transfers.
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The search for better is endless. Instead simply find very good and get the job done.
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