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Errors
Before going further, I really want to find where these errors come from.
Here are my observations :
- They seem to affect almost always the first byte. Moreover, this byte doesn't get a random value, but almost everytime BD or BF.
- The most affected frame seems to be the second one after a track change...
- Most errors consist in '1's read instead of '0's : We get BD (10111101) or BF (10111111) while we should get 3D (00111101)
Possible causes :
- Ambiant noise.
- Level problem.
- Software problem.
I really don't think it comes from software. Not only because I'm better in software than hardware, but mostly because it works most of the time, and errors are so localised.
The fact that many errors come after a track change can be due to the spikes generated by motors inside the changer, or to the motors drawing so much current that voltage drops temporarily and levels are pulled down...
Anyway, when I have time, I'll try the changes advised by Ale and will take some mesures again to check levels and threshold
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