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#int_ssp is not working

 
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theteaman



Joined: 04 Aug 2006
Posts: 98

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#int_ssp is not working
PostPosted: Mon Oct 05, 2009 1:49 am     Reply with quote
Hi I am trying to get two PICs to communicate together with the SPI interrupt.

Code:

<code was completely wrong, removed! sorry for the inconvenience!>



Last edited by theteaman on Mon Oct 05, 2009 9:20 pm; edited 1 time in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Oct 05, 2009 2:07 am     Reply with quote
Two examples:
http://www.ccsinfo.com/forum/viewtopic.php?t=39145
http://www.ccsinfo.com/forum/viewtopic.php?t=26888
theteaman



Joined: 04 Aug 2006
Posts: 98

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PostPosted: Mon Oct 05, 2009 3:11 am     Reply with quote
PCM programmer wrote:
Two examples:
http://www.ccsinfo.com/forum/viewtopic.php?t=39145
http://www.ccsinfo.com/forum/viewtopic.php?t=26888

thanks PCM programmer, however I have already seen these examples and from what I can see I am doing everything right.. I was hoping someone could see something wrong with my code above...
Wayne_



Joined: 10 Oct 2007
Posts: 681

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PostPosted: Mon Oct 05, 2009 4:58 am     Reply with quote
You index (i) does not increment.
With your current setup you coluld get overrun in your buffer as you do not reset i until later on in main (after a 100us delay as well!) If even 1 char comes in after i = 4 before you set it back to 0 you would get corruption.

Try adding to your code.

Code:

int1 done = false;

#INT_SSP
void ssp_isr(void)
{
   buffer[i] = spi_read();
   if (i++ == 4)
   {
     i = 0;
     done = true;
    }
}

And in main change it
Code:

// change
//      while(i < 4); //wait until all characters are recieved by int_ssp
// To
    while(!done);
    done = false;
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