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CM-900 Series is the embedded board with STM32F103C8 based on 32Bit ARM Cortext-M3 and its circuit diagram and the entire sources are open to public. At this very moment, CM-900 is developed and the prototype models are out in the market, and we plan to introduce newer version with bigger capacity in the future. If you think you can technically contribute to the devel… +more
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Hi everyone I am leader of CM9 circle, developed prototype CM-900 h/w board(CM-900 is one of the CM9 serise) and integrated …+more
Created 2013-04-23 Members 187 Ranking 1 포인트 44,234
Interested Area > Robot H/W Design
USA
Can I post to this forum?
Writer : jwatte DATE : November 29, 2014 | Hit : 3,408
I don't seem able to actually post to this forum.

jwatte

Comment 3

jwatte 14-11-29 06:53 Comment
OK, I guess that worked. But, my longer problem description, with code and pictures, doesn't work :-(


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jwatte 14-11-29 06:54 Comment
There is an intermittent problem with reading data back from MX-64T servos in my robot (using OpenCM9.04 as controller.)


Here is a screen shot of Saleae Logic, with the green channel (5) seeing a pulse whenever I detect a timeout, and the black channel (0) showing when I send data:

https://www.amazon.com/clouddrive/share/XbbVbj8NKVrU8b6Ih6-8RSK0zUlTJwphqXCqoFETMuw

The logic probe is taken at the end of one of the five servo strands, so any signal quality issues would presumably show up in the plot. I see none.

My guess is that the servos sometime take an interrupt in their motor controller loop just as a command is coming in, and they miss some part of the packet, and thus don't respond. But why would this happen twice in a row? It's as if the servos sometimes drop off the bus for over 10 milliseconds!

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jwatte 14-11-29 06:57 Comment
Here's more close-up of a particular event:


https://www.amazon.com/clouddrive/share/U93hlksfeMs2G4zwpfY66IG-whhp_1QVwEjMkjm50f0



https://www.amazon.com/clouddrive/share/uA3ljkEUCUSWHJgMtzEn1ag1F5v8rgPf4JgKl472F6o




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