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Modifying kbd.c (from ccs) to use in PORT_D

 
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Marq



Joined: 06 Oct 2009
Posts: 9

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Modifying kbd.c (from ccs) to use in PORT_D
PostPosted: Sun Oct 11, 2009 4:00 am     Reply with quote
The below codes is taken directly from the ccs kbd.c, and i want to change it to apply in PORT_D(i am using PIC16F877A ). What
changes i should make to the code?

Furthermore, what are this value #byte kbd = 0xF81 and #byte kbd = 0xF83 is it the same for all PIC ?

Code:
// Un-comment the following define to use port B
// #define use_portb_kbd TRUE

// Make sure the port used has pull-up resistors (or the LCD) on
// the column pins


#if defined(__PCH__)
#if defined use_portb_kbd
   #byte kbd = 0xF81                   // This puts the entire structure
#else
   #byte kbd = 0xF83                   // This puts the entire structure
#endif
#else
#if defined use_portb_kbd
   #byte kbd = 6                  // on to port B (at address 6)
#else
   #byte kbd = 8                 // on to port D (at address 8)
#endif
#endif

Can someone clarify about it, thanks.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Oct 11, 2009 11:18 am     Reply with quote
Quote:
What changes i should make to the code?

Don't make any changes. Read the comments in the code. They say
exactly what to do. They say to "un-comment" the #define statement
to make it work on Port B. So, to make it work on Port D, just leave
the #define statement "commented out" (as it currently is).
Don't make any changes to it.


Quote:

Furthermore, what are this value #byte kbd = 0xF81 and #byte kbd = 0xF83 is it the same for all PIC ?

The code is setup to automatically compile for the correct PIC type.
If you use a 16F PIC, the lower portion of the code code will be used.
Notice that it uses Port addresses of 6 and 8. Those are for 16F PICs.

You need to study #if, #else, and #endif statements and their purpose.
They allow "conditional" compilation of code, so that one program can
be compiled with different sections of code, depending upon your settings.
Read a book on this, or read an online tutorial.
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