I'm using the TinyG with the LitePLacer pick and place machine. Originally, when homing, the z-axis moved in the wrong direction (regular commands to the z-axis motor resulted in motion in the correct direction). At this point, all other aspects of the TinyG board worked as expected.
I used the TinyG updater to update to the 440.20 firmware, which seems to have caused more issues. A signal for motion in the positive x direction results in movement in the negative x direction (and vice versa). A signal for motion in the positive y direction results in motion in the negative y direction and motion in the positive z direction (and vice versa). A signal for motion in the z direction results in corresponding rotation of the a-axis. A signal for motion of the a-axis sends power to the y and a-axis motors, but causes no motion.
The wiring has not been changed since before the problem arose, so it's most definitely something weird with the software... (unless I somehow fried part of the board). If anyone has any advice or experience to share pertaining to this sort of issue, it would be greatly appreciated.
Here is a link to my TinyG's configuration settings (from the $$ command)
Link