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Forum Index : Microcontroller and PC projects : CMM2 graphics examples and explanation

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GregZone
Regular Member

Joined: 22/05/2020
Location: New Zealand
Posts: 100
Posted: 05:54am 01 Jul 2020
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  panky said  Sorry folks, flakey PDF creation with PDF Creator.

I tested this version,
Graphics Programming on the CMM2-v1.0b.pdf on Firefox and Acrobat 9.

Please let me know if there is still an issue. Also corrected a few of (my) typos.

Thanks for the quick fix Doug.  

I've tested on my system and looks to be all good now.

One other thought occurred to me: It might be useful to add a "Revision History" page to the end of the document, where you can briefly note changes & additions made to later versions.

I suggest this, as this is a tuturial / reference that's likely to grow as more content is added.  For those who have already worked through an earlier version, it will be very useful to be able to easily identify what sections have been changed or added since the version they have previously read (instead of having to re-read the whole document, to try and figure out what's new).

Just me 2c  
 
KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 666
Posted: 09:41am 01 Jul 2020
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  panky said  Sorry folks, flakey PDF creation with PDF Creator.

I tested this version,
Graphics Programming on the CMM2-v1.0b.pdf on Firefox and Acrobat 9.
s.


Very nice manual, thanks for putting it together.

Mike.
It's all too hard.
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 335
Posted: 10:57am 01 Jul 2020
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When replacing the crystal oscillator with a canned one improves the performance, there is a possibility that the oscillator area on the board is noisy because digital traces run through the area (in different layers). If one of these digital traces is toggling (i.e. to create VGA video..??) this can phase modulate the crystal oscillator.

Phase modulation of the crystal oscillator may cause instability in the PLL's inside the H7.

This can only be solved by improving the board layout. If the Waveshare board is the culprit (we have no control over it's layout), there is no alternative then placing a canned oscillator.

Volhout
Edited 2020-07-01 20:58 by Volhout
If nothing goes right ... turn left
 
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