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Passing RS-232 streams

 
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Mattr0



Joined: 27 Mar 2005
Posts: 30

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Passing RS-232 streams
PostPosted: Mon Feb 13, 2006 8:58 am     Reply with quote
I want to creat a function the will recieve some bytes and I am using two different rs232 streams. Both routines will be the same and I was wondering is any knew if it was possible to pass the stream identifier to my recieve function
Ttelmah
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PostPosted: Mon Feb 13, 2006 10:19 am     Reply with quote
Yes, and no...
The code generated to handle a stream, is 'hardwired', to the I/O bit used. So you cannot use a variable to transfer it, and gain anything. The code has to exist seperately for each stream. However there is nothing to stop you from passing the name to a function, and then use a switch statement to select the required routine. The names can be passed as an int8 variable, so:
Code:

void fn(int8 chr,int8 stream) {
   switch (stream) {
   case hard :
      fputc(chr,hard);
      break;
   case soft :
      fputc(chr,soft);
      break;
   }
}   


With streams called 'hard', and 'soft', will allow you to send characters to a named stream.

Best Wishes
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