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Acces bank 18F452

 
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Johan van den Heever
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Acces bank 18F452
PostPosted: Wed Jan 22, 2003 1:46 am     Reply with quote

I am passing a constant to a procedure with the following def:
void command_lcd(int8 command)
{
....
PORTD = command;
....
}
This procedure is called in the main loop to as part of the lcd init procedure:
void lcd_init()
{
command_lcd(6);
command_lcd(12);
.....
}
main
{
....
init_lcd();
....
}
My problem is the following: The correct value does not reach PORTD unless init_lcd() in the main loop is preceded by a BSR = 0 command. Is this normal? Can somebody please explain.
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Original Post ID: 10883
TSchultz



Joined: 08 Sep 2003
Posts: 66
Location: Toronto, Canada

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RE: Acces bank 18F452
PostPosted: Wed Jan 22, 2003 5:49 am     Reply with quote

:=I am passing a constant to a procedure with the following def:
:=void command_lcd(int8 command)
:={
:=....
:= PORTD = command;
:=....
:=}
:=This procedure is called in the main loop to as part of the lcd init procedure:
:=void lcd_init()
:={
:= command_lcd(6);
:= command_lcd(12);
:= .....
:=}
:=main
:= {
:= ....
:= init_lcd();
:= ....
:= }
:=My problem is the following: The correct value does not reach PORTD unless init_lcd() in the main loop is preceded by a BSR = 0 command. Is this normal? Can somebody please explain.

What version of the compiler are you using?

I recently completed (I hope!) a project I switched over to a PIC18F452 and found a few "bugs" in the compiler mostly to do with the handling of the memory page select bits. I was using approx 900 bytes of the RAM and had to place #locate statements to manually place almost all of my varaible into specific page banks. Once I had done this most of the odd problems went away.

For example I found some problems with the compiler placing arrays across page banks. I did not take the time to verify that it generated the proper assembly to handle the page selections properly but it definitely caused problems for me. Once I moved all my arrays to manually selected areas those problems dissapeared.

I just wish they would provide a list of known issues so we all don't have to waste time troubleshooting things that are known to be bad. I do understand that the compiler is a work in progress but we knew ahead of time all the known issues it would make troubleshooting easier.

-Troy
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Original Post ID: 10887
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