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Forum Index : Microcontroller and PC projects : MMBASIC manual v6....
| Author | Message | ||||
Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9531 |
Confusing syntax and example for using a classic 16x2 or 16x4 LCD module, page 52:  You will see exactly where I went wrong, but the example does NOT include the "DEVICE" keyword, so my attempt was rejected.  Smoke makes things work. When the smoke gets out, it stops! |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9531 |
....and the following page on how you write to the LCD module, is also generating unknown command errors.  Perhaps I am the only one on Earth now, trying to use these old legacy LCD modules.   EDIT: DEVICE LCD command fixes this issue, as you might expect, but I think the manual needs a tweak here. Edited 2025-05-27 17:18 by Grogster Smoke makes things work. When the smoke gets out, it stops! |
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| Volhout Guru  Joined: 05/03/2018 Location: NetherlandsPosts: 4940 |
No, you are not the only one. But I failed to send a user manual correction to Geoff. The new 6.00.02rc24 supports both (just tested) - DEVICE LCD INIT a,b,c,d,e,f (legacy 5.08.00) - LCD INIT a,b,c,d,e,f (legacy micromite) Volhout Edited 2025-05-27 17:18 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9531 |
Good to know.  Perhaps that should be in the manual - the legacy vs newer versions.... Or is this just creating even MORE confusion? I have my LCD working fine now, so long as I prefix a DEVICE keyword before the command as stated in the manual.  Smoke makes things work. When the smoke gets out, it stops! |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4940 |
The DEVICE was a temporary solution. MMBasic used a tokenizing scheme that allowed for 128 commands and 128 functions. During the development of PicoMite so much functionality was added that 128 was not enough. The DEVICE command/function was added to group a set of peripherals. DEVICE HUMID DEVICE LCD DEVICE WS2812 etc... To free up slots for other commands. Then (between 5.08 and 5.09) the functions changed from 8 bit to 16 bit. And between 5.09 and 6.00 the commands changed from 8 bit to 16 bit. So in 6.00.02 we have no limit on 128 anymore and the DEVICE was obsolete. But for compatibility for programs developed between 5.08 and 6.00 (I assume) DEVICE is still maintained as alternative. Apparently the user manual was in a between state... That should sum it up. Volhout P.S. for a while DEVICE was called BITBANG Edited 2025-05-27 18:03 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9531 |
Interesting! I was not aware of that. I thought the limit was still 128 on commands or functions. I remember it being talked about before, but it was said that it would require a MAJOR rewrite of MMBASIC to support more. I am/was unaware of any MAJOR re-write of the entire MMBASIC code-base, only various ports being done, mainly by Peter. You learn something new every day. Being now 16-bit commands and functions, does that mean the theoretical limit is now 65,535 commands and functions?  Smoke makes things work. When the smoke gets out, it stops! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10106 |
Functions are still limited. Only commands now use a 2-byte token with 2^14 possible variants |
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