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Lcd Driver for 18LF4620

 
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Emm386exe



Joined: 17 May 2005
Posts: 3

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Lcd Driver for 18LF4620
PostPosted: Wed May 25, 2005 8:52 am     Reply with quote
Hi everyone

I use a PIC18LF4620 with PCW 3.206.
I'm trying to use lcd driver using the code found at http://www.ccsinfo.com/forum/viewtopic.php?t=19327
(because the default "lcd.c" used for my old PIC16F877A doesn't work anymore with PIC18LF4620)

But I have compiler errors at these lines :
Code:

//*********  set tris d  *******
#define set_tris_lcd_read(){\
set_tris_a(TRISA & 0xf1/*0b11110001*/);\
set_tris_d(TRISD | 0x0f/*0b00001111*/);\
   }
#define set_tris_lcd_write(){\
   set_tris_a(TRISA & 0xf1/*0b11110001*/);\
   set_tris_d(TRISD & 0xf0/*0b11110000*/);\
   }

The error is : "Undefined identifier TRIS A"
When I tried to define TRISA (ex. #define TRISA 0x85), I have an another error which is : "Undefined Identifier set_tris_d."

The problem is that I don't really understand these lines. If you have examples of application or explanations I would be gratefull, maybe I can rewrite these instructions in an another way.
Ttelmah
Guest
PostPosted: Wed May 25, 2005 9:44 am     Reply with quote
1) Yes you need to define the TRIS registers to use the commands as given. The original poster must have been including a file with these definitions.
2) 0x85, is _not_ the address for th TRISA register on the 18 family. Read the data sheet...
3) You need to upgrade the compiler. There was a problem around the version you are using that though it 'purported' to support the 18F/LF4620, it still has the register map setup for the 2620 instead, and hence did not recognise portD.

Best Wishes
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