I just use table reads on the 18F series - you can get two bytes of data in 
the same space as a RETLW instruction and using the TABLTRU/H/L registers 
makes it nice and easy to read long strings.

I don't think I'd go back to the RETLW method after setting up my routines 
for the table reads.

Dom
----- Original Message ----- 
From: "Jinx" <joecolquitt@clear.net.nz>
To: "pic microcontroller discussion list" <piclist@mit.edu>
Sent: Friday, June 20, 2008 4:21 AM
Subject: [PIC] String retrieval macro


> Does anyone have such a thing for the 18F ? I've got a bunch
> of retlw messages for an LCD, of the type
>
> addwf pcl
> dt "message1"
>
> in lower memory, 0x100 - 0x580, and some cross boundaries,
> which means updating PCLATH. Normally I don't have such a
> large number of messages, and would arrange it so that page
> straddling is avoided
>
> Options for me are
>
> 1) re-write them as tables. Not so bad but that seems defeatist
> 2) possibly re-invent the wheel by writing my own macro
>
> Ideally I'd want a macro that's self-modifying, perhaps using
> something like
>
> get message1
>
> which would find PCLATH (ie high(message1)) then correct
> PCLATH if ADDWF PCL goes over a boundary
>
> Any offerings or thoughts ?
>
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>


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