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Single-turn absolute encoder return to zero

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14 Dec 2021 13:52 #229056 by wang
Single-turn absolute encoder return to zero was created by wang
I have found such a description for the zero return work of a single-turn absolute encoder.
 
I followed the instructions to configure
HOME_ABSOLUTE_ENCODER = 1

However, when returning to zero, it only takes effect for the first time, that is, clicking HOME once can return to the zero position, but after moving to another position, clicking the HOME axis again has no response, it will not return to the zero position and no alarm is generated.

This is my configuration, please ignore the first four lines of HOME_ABSOLUTE_ENCODER, I have tried to comment them, the effect is the same
 
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15 Dec 2021 19:35 #229156 by andypugh
Replied by andypugh on topic Single-turn absolute encoder return to zero
Unfortunately a single-turn absolute encoder is not what LinuxCNC means by "absolute".
It is _possible_ to simulate an absolute encoder using the position.txt file (though it will need to be re-homed if that file is corrupted or not written on exit)

This behaviour is actuallybuilt-in to the Mesa resolver driver (I mainly added it for my own convenience)

Which encoder interface are you using?

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