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rs232 problem

 
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seyoung



Joined: 11 Nov 2016
Posts: 8

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rs232 problem
PostPosted: Mon Aug 21, 2017 12:16 am     Reply with quote
We want to send data using rs232.

However receive device want to use following protocol:

ex ) we want to send '123'
send data (*HEX) : 31 32 33
** Each hex data must have space bar.

but printf () function in PCW,
actual send data (*HEX) : 313233

So receive device can't read anything.

How can i make space bar in our every sending data ?
Ttelmah



Joined: 11 Mar 2010
Posts: 19553

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PostPosted: Mon Aug 21, 2017 1:28 am     Reply with quote
Do it digit by digit.

You don't show us how the data is stored at the PIC end?.
However:
Code:

   int8 to_send=123;
   int8 ctr;
   char buffer[4];
   
   sprintf(buffer,"%03d", to_send);
   //buffer now has '123'
   for (ctr=0;ctr<3;ctr++)
   {
       printf("%02X ",buffer[ctr]);
   }
//will print "31 32 33 "

This takes the source integer, turns it into ASCII, 3 digits long, then outputs these three digits in hex, each with a trailing space.
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