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Thanks for sharing. I did investigate reading the device tree when working on the RP1 driver but took the easy path so as to focus on the DesignWare SPI side of things. Looks like I'll need to rework the board detection. At least the Mesa code will be a great starting point.

I have a small AC rotary but it does not have a nutating joint just a plain old 90° setup.

Hi All,
I plan to upgrade my MH400 e with Linuxcnc. I bought a 6i25 + 7i77 and now I´m starting to configure the Cards In/ -outputs for my Mill. I have a fresh install of Linuxcnc (2.9.4) and run into the problem that whenever I try to configure the PWM Signals of the 7i77 the tap just isn´t there. I had a bit of success when i tried the PnCConf Wizard on the Live distribution, but there I couldn´t configure the encoders on the 7i77. I tried older Versions of Linuxcnc but that also didn´t help. I hope someone can point out my mistake, that I am obviously making because it seems to be working for so many others . 

Thanks for your help,
Simon

Is the 7I77 jumpered for differential inputs?

It may be a noise issue. One way to check if it's a common mode noise issue
(noise that exceeds the common mode range of the RS-422 receivers)
is to enable encoder error reporting:

setp hm2_5i25.0.encoder.00.quad-error-enable true

Once this has been done, inputs that violate the quadrature sequence
(often noise will do this) will set the quadrature error flag:

hm2_5i25.0.encoder.00.quad-error



 

aikiaviator wrote:

What is the process to move the X, Y and Z axis back to mid point, when the machine says cant because limits activated?
 

I think you have this a bit wrong. Home switches need to remain triggered until the end of travel. That way, Linuxcnc know which way for initial homing movement. Take the case  of the X axis, Say the home switch is 40mm from end of travel on the left and it stays triggered to the end of travel. If the home switch is triggered when homing starts, Linuxcnc knows it must travel to the right to find the home switch edge. HOME_OFFSET sets the final position. If this is a shared home/limit switch you need to move to the right so the switch is no longer triggered otherwise it will trigger a limit switch error once homing finishes.

If you have seperate home and limit switches, the final position can be in that 40mm where the home switch is held triggered.

do you have a machine that uses this?