As per
https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
Got this running fine on a RPi. However, can't get this working at all on the XU4.
Have enabled
system.power.switch=PIN56PUSH
in recalbox.conf
I'm using a shifter shield as per here:
http://www.hardkernel.com/main/products/prdt_info.php?g_code=G143556253995
My understanding is that if I bridge the following pin with GND this will cause a power on/off:
WiringPi# = 9
Name = SCL1
GPIO# = 210
I've measured the resting voltage between these two and it reads either 3.3V or 5V as per the shifter shield setting. However, if I bridge it at either voltage, nothing happens!
Any ideas? Has the XU4 image had wiring pi and/or compatible scripts installed?