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Send string on port different

 
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Cheick



Joined: 07 Feb 2005
Posts: 12

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Send string on port different
PostPosted: Tue Apr 06, 2010 4:45 am     Reply with quote
I would like to send 1 character 8 bit on different port(port a and b) is this possible? How to do?

I m sorry for my english
Very Happy
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Tue Apr 06, 2010 6:10 am     Reply with quote
http://www.ccsinfo.com/faq.php

Look at Input/Output

You will get the answer reading the CCS Compiler manual as first step, there are enough info regarding this.

Humberto
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Tue Apr 06, 2010 7:31 am     Reply with quote
I think he is asking about splitting a byte onto two ports.

If so, not simply.

Different answers according to the actual pin layouts involved, how many pins are on each port, etc..
Simplest, test each bit in turn, and output the required bit based on the test. So:
Code:

output_bit(PIN_A4,bit_test(val,0));
output_bit(PIN_A6,bit_test(val,1));
output_bit(PIN_A7,bit_test(val,2));

//etc..

This will work for any bit order, does not require the bits to be consecutive, and allows you to still use 'standard_io' mode. It is surprisingly quick to execute.

Other answer, rotate and mask (if required).
Code:

output_b(val/16); //Put top fout bits of 'val' out on the low four
//bits of port B.
output_a((val*16)+(input_a() & 0xF)); //Put the bottom four bits of
//val, onto the top four bits of port A, at the same time keeping the
//bottom 4 bits of port A unchanged

Obviously, if the low bits here are used as inputs, provided you use 'fast_io' mode, you can set TRIS so only the top four bits are changed by the output, and don't have to mask.

A search here will find a number of answers to this, in particular in relation to LCD's split across ports.

Best Wishes
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