Hi all,
I've come accross LCD library files. I remember there were lots of posts about
these. There were issues, like:
1. how do we name lcd libs ? Using a "lcd_" prefix (lcd_hd44780_4) or not ?
2. proc/func should be prefixed by "lcd_", as many proc/func in libraries
3. should all lcd libraries implements the same interface ? That is, should
we have the same proc/func names in all lcd libs ?
4. what do we do with Richard'ds lcd lib ?
5. there were hardware stack issues. Could the last jalv2 compiler (2.4h)
help us, with its new pragmas ?
About 1.: I think we all agree to keep the "lcd_" prefix, to prevent namespace
collision.
About 2.: as of right now, this is not true. Specifically, lcd_hd44780_4.jal
has proc/func starting "hd44780". Some would *really* need refactoring
(hd44780_line{0,1,2,...}), hd44780'put is *exactly* the same as lcd'put.
Why ? (I cannot see any good reasons we should duplicate this kind of code).
I know this about "oldskool" jal, but old school doesn't mean duplication of
code... More, if there's a need of being oldskool compatible, maybe a better
approach is to put the proc/func in a "lcd_hd44780_oldskool.jal", with
proc/func using our new lcd_hd44780_4 (with pragma inline, etc...). Eur ?
About 3.: this is not the case. Should we still try to standardize our libs
with one interface ? Is it too much work ? Is it too early for now to
consider this ? Will we never have more than one lcd attached to a PIC ?
About 4.: please advise ! Richard's lib has nice high-level procedures
(lcd_time, lcd_date,lcd_progress, ...). Maybe we could extract them to
another lcd lib, so people can decide to include it or not.
About 5.: jalv2 2.4h has introduced new pragmas not to generate return, but
goto instead, which may be useful here to save some stack.
Cheers,
Seb
--
Sébastien LELONG
http://www.sirloon.net
http://sirbot.org
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