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Forum Index : Microcontroller and PC projects : Fishies on Screen

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Plasmamac

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Joined: 31/01/2019
Location: Germany
Posts: 579
Posted: 09:04pm 05 Dec 2020
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Hi , i Build the cmm2 . I use 5.05.03.
ive got Bad vga. Ok Screen on Startup But much Fish/ glitches if i Display a bmp.
Ive got. much Moore glitches on the hd tv.
Can anyone help ?


Edited 2020-12-06 07:05 by Plasmamac
Plasma
 
TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6283
Posted: 09:14pm 05 Dec 2020
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Are you using the Waveshare module?

If you are, you will get a much better video if you replace the 8MHz crystal with an oscillator module.

https://www.thebackshed.com/forum/ViewTopic.php?TID=12506&PID=153775#153775

Jim
VK7JH
MMedit
 
Plasmamac

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Joined: 31/01/2019
Location: Germany
Posts: 579
Posted: 09:35pm 05 Dec 2020
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yup , i use the waveshare module. thx for the info
Plasma
 
LeoNicolas

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Joined: 07/10/2020
Location: Canada
Posts: 504
Posted: 01:31am 06 Dec 2020
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I had the same problem and the mod fixed my CMM2.
 
Plasmamac

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Joined: 31/01/2019
Location: Germany
Posts: 579
Posted: 02:14pm 08 Dec 2020
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Hmm , i wonder Why your Solution will work. I mean the waveshareboard has a Standard chrystal onboard.
Plasma
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283
Posted: 07:51pm 08 Dec 2020
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  Plasmamac said  Hmm , i wonder Why your Solution will work. I mean the waveshareboard has a Standard chrystal onboard.

With the standard crystal, the frequency suffers from instability, probably due to slight voltage fluctuations.
The recommended oscillator module does not suffer from this instability which is why it is so much better.

Jim
VK7JH
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