On 1/12/2014 1:19 PM, Thomas Studwell wrote: > The only oddity, which doesn't affect the motion but does affect > power consumption, is that the signals are not initialized to high > (AKA inactive state) on program startup. The signals do go high and > remain there after the first step, however. The motors are energized > at high level when the signal is left low.
You can fix this by editing the setup*.sh script in your configuration directory. At the end of the file is a list of GPIO pins (using the Linux Kernel numbering scheme) and their desired mode (typically out). The default initial value for output pins is low. If you replace the "out" in setup*.sh with "high" for the appropriate pins, the GPIO pin will be initialized to a high value which it will keep until LinuxCNC fully starts up and begins to twiddle the pins. If you need to figure out the proper kernel GPIO values to change, you may find the following spreadsheet useful: https://github.com/cdsteinkuehler/beaglebone-black-pinmux/blob/hal_pru_generic/pinmux.ods -- Charles Steinkuehler char...@steinkuehler.net
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