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Forum Index : Microcontroller and PC projects : Teensymite?
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| JohnS Guru  Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
Any different CPU will need s/w effort. Vastly more if not I/O-compatible (from the s/w point of view) with an already-supported CPU. (Which likely rules out such as the teensy.) Chances are Peter is the best person to advise in detail, of course. As a number of STM32 CPUs are already supported is there really no (*) board with (say) such a CPU but maybe a different number of pins? E.g. STM32H743 (or 753) but fewer pins than the ones already supported? I'm guessing that would reduce the s/w effort. (*) breadboard-friendly or whatever the physical / h/w spec is John |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2170 |
EDIT: sorry 'bout double post, clicked wrong link Edited 2021-11-30 19:58 by CaptainBoing |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
I see Peter has now said as much regarding the s/w here John |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
That's interesting, John. I don't remember seeing that before. Thanks. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| fred777 Regular Member  Joined: 01/07/2021 Location: United KingdomPosts: 57 |
Well this board would be ideal, dip formfactor lots of flash storage and sd card slot and an LCD Connector. Its just that all small boards (also the Daisy Seed) seem to be based on the STM32H750... I wonder how different it is from the 743... there seem to be boards that can be ordered with one or the other... hmmm STM32H750VBT6 core board Edited 2021-11-30 21:04 by fred777 |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10315 |
STM32H750 can't run MMbasic - only 128Kbyte of flash |
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| fred777 Regular Member Joined: 01/07/2021 Location: United KingdomPosts: 57 |
oops... good point  |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3378 |
Me three. I think that 44-pin STM32H743VIT6 module would be a nice addition to the MMBasic stable. And having additional people working on and familiar with MMBasic firmware source code would also be a plus. ~ Edited 2021-11-30 22:51 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
44 pins? Is it worth the hassle for 4 additional pins? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
It's a 100-pin chip so which module do you mean that has 44-pins? I'm looking at this which seems promising but I don't know if it matches the breadboard-friendly part in the way wanted. John Edited 2021-12-01 00:10 by JohnS |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3378 |
My mistake--multiplied the row length by 2, not 4. I mean the 88-pin module linked to by knvid above (or similar). If he believes it's worth the hassle, that's good enough for me. Edited 2021-12-01 00:14 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
That's the same one or near enough I think - if one avoids the 750 cpu. As I posted, sticking to a 743 makes the job much easier. John |
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dMajo Newbie  Joined: 18/05/2020 Location: ItalyPosts: 28 |
+1 ALLdataEE.com EDU Promos |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
I see more than one schematic: E.g. here or here John |
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| fred777 Regular Member Joined: 01/07/2021 Location: United KingdomPosts: 57 |
But couldn't MMBasic run from the large external QSPI Flash like on the Picomite? Probably not, can't find anything about that in the Datsheet Edited 2021-12-05 07:44 by fred777 |
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| fred777 Regular Member Joined: 01/07/2021 Location: United KingdomPosts: 57 |
+1 here too |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10315 |
I posted a detail explanation of how to add a different board to a port. If anyone wants it they are going to have to do the slog work. I can't and won't support each and every "nice-to-have" board/chip |
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| fred777 Regular Member Joined: 01/07/2021 Location: United KingdomPosts: 57 |
Understandable. Let me just sat that I am thankful for all the work that has gone into MMBasic and that the picomite version works nicely for me. EOT |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
Even if it could you would have more work to do than using a variant of an already-supported CPU. I.e. the 743VIT6 would likely be lots less effort because the 743 is already supported in another pinout. (Personally I'd just stick with what already works.) John |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
MMBasic running from external flash would be a lot slower than using on-chip flash as it's accessed over a serial link. IIRC the PicoMite copies fast running MMBasic runtime routines into RAM and runs them from there. The less important and slower routines run from flash. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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