Mesa 7i92 set all pins to predefined state at exit

  • Shu
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09 Jul 2016 01:57 #77202 by Shu
Is it possible to set outputs to low/high/high impedance when LinuxCNC is not running and keep them in that state until LinuxCNC takes over?

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09 Jul 2016 02:28 #77203 by PCW
The initial state (and state when the watchdog bites) is all high
(Pulled up inputs)

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09 Jul 2016 02:29 - 09 Jul 2016 02:30 #77204 by Shu
Right, can that be changed to all low/all high impedance/chosen pins low? Without using external resistors..
Last edit: 09 Jul 2016 02:30 by Shu.

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09 Jul 2016 02:32 - 09 Jul 2016 18:25 #77205 by PCW
No, its always high at powerup/watchdog bite

I should add that it is possible to have a FPGA configuration that pre-defines pins as outputs
but these still will not be driven during the FPGA configuration loading time so its better to
either use the intended active low mode of the 7I92 outputs or (better) to implement a charge pump
Last edit: 09 Jul 2016 18:25 by PCW.
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