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Forum Index : Microcontroller and PC projects : CMM2 - few questions
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jirsoft Guru  Joined: 18/09/2020 Location: Czech RepublicPosts: 533 |
Hi all, after weekend's first playing with my new CMM2, I found few "problems" I didn't find the solution for. Maybe I just looked not well and the way exists, can somebody help me? 1. DefineFont - can be font defined "on the fly" in running program? I found 2 ways to (re)define font, either load font definition from file or to include DefineFont constants hard into app. But I know the font shape first when app runs... 2. CSUB. Because of complexity to compile assembler prg and prepare it for CSUB, I would like to find some "shorter" way. For example few lines of assembler code to let compile in some web Thumb assembler and put direct into CSUB constant. Can be format of the CSUB be more commented? Can I somehow disassemble working CSUB? I was not successful... Or can be somehow called ARM code direct from BASIC (SYS address)? 3. If I have variable defined for example integer (DIM INTEGER vvv), this variable is also accessible as vvv%, it should be such way? Thanks for help Jiri Napoleon Commander and SimplEd for CMM2 (GitHub), Â CMM2.fun |
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TweakerRay Senior Member  Joined: 01/08/2020 Location: GermanyPosts: 138 |
To 1: you can define Font in a running programm if they have a higher number than 7 I think. The first 1-7 are the predefined fonts... So you can for instance define one font at #8 and another font at #9. you can either include the code of defining in the programm or you include the font as a .inc I think you can do up to #16 font I think... to 2 and 3 I can not say much. http://tweakerray.bandcamp.com |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
If you load a font from a file, it has to be #8 You can reload a different #8 as often as you like. If you included fonts in your program, they can be font number 1 to 16 with the following limitation: It can be the same as an existing font (except fonts 1, 6 and 7) and in that case it will replace that font. Jim VK7JH MMedit |
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| jirsoft Guru Joined: 18/09/2020 Location: Czech RepublicPosts: 533 |
To point 1: I know the character shape first when app runs, so I need somehow define font "on the fly", so that's not possible, right? Or could be in DefineFont used variables? Edited 2020-10-19 19:10 by jirsoft Jiri Napoleon Commander and SimplEd for CMM2 (GitHub), Â CMM2.fun |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3292 |
Sorry, but that is the way it is - there are no shortcuts. Writing in C and creating CSUBs is complicated. That is partially why MMBasic is so popular. What is the problem with this? If DIM INTEGER vvv creates an integer then vvv% refers to the same integer. Defining vvv as an integer twice is not an error, Geoff Geoff Graham - http://geoffg.net |
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| jirsoft Guru Joined: 18/09/2020 Location: Czech RepublicPosts: 533 |
Thanks Geoff, with CSUB I agree, I would like just make some short snippet of code faster... And I have no problem with INTEGER vvv vs. vvv%, it was just a question, if that's not bug. So the shortest way (smallest amount of written code), wil be: DIM vvv% vvv = 2 * vvv ? Edited 2020-10-19 19:28 by jirsoft Jiri Napoleon Commander and SimplEd for CMM2 (GitHub), Â CMM2.fun |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10315 |
Be careful this will only work if OPTION DEFAULT INTEGER is set otherwise you will get an error. Likewise OPTION DEFAULT INTEGER DIM vvv! vvv = 2 * vvv will give an error as will anything after OPTION DEFAULT NONE much better to stick to either using postscripts or not throughout Create the "on-the-fly" font on an unused page and use BLIT for this requirement Edited 2020-10-19 20:28 by matherp |
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| jirsoft Guru Joined: 18/09/2020 Location: Czech RepublicPosts: 533 |
HI Peter, I'm still looking for the optimal way, how to declare variables (with OPTION DEFAULT NONE, as that find I as safest), but I think I will stick with prefix (DIM INTEGER...) With BLIT super simple idea, why I missed it... Jiri Napoleon Commander and SimplEd for CMM2 (GitHub), Â CMM2.fun |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2170 |
Note that the variable name is "unique" - any variable, regardless of type, can only use the name once. for instance; you couldn't have V% and V$ in the same program where they can "see" each other... e.g both in the main thread or both in the same SUB or FUNCTION It might seem obvious that you can't have Dim Integer V Dim String V Neither variable is qualified by its type indicator... and yet it seems harder for some to understand why you can't have Dim V% Dim V$ the type indicator does not form part of the variable name, so this would be logically the same as the first example above. Some Dialects of Basic do allow the variable names to be duplicated across scope, so implicitly the type declaration seems to form some part of the name. An example here; Locomotive Basic will happily allow stuff like DefInt a-z v=10' implicitly an integer due to the "defint" above v$="fred" But not MMBasic. Small point If the variables cannot "see" each other then it will work, so... Dim Integer V Sub MySub Local Float V End Sub is fine. Local variable (and statics) inhabit their own little world. The same rules apply *within* that world, but not between worlds. One caveat, if you have a global variable called V, you can play with that inside a SUB/FUNCTION, but if you declare a Local variable (inside a SUB/FUNCTION) called V, MMBasic will drop the association with the global. If you then try to use it, it will throw an error, see: dim integer v sub mysub local v$' <--- at this point, I lose contact with the global v (same names) v=v+2 '<--- this tries to do an implict DIM, which fails Print v end sub > RUN > mysub [5] v=v+2 Error: V already declared > Simple enough when you get it  Best practice is just to keep variable names unique yourself.Edited 2020-10-20 00:41 by CaptainBoing |
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