Android8.1 GPIO different between SOM-rk3399 and nanopc-t4
Posted: Mon Oct 14, 2019 10:51 am
Hi,
I've developed my own baseboard for the som-rk3399 and prototyped software with the nanopc-t4 while the hardware was being designed/built/debugged.
While the schematic for the SOM lists all the same GPIO pins as the t4, none of the GPIO pins in the GPIO demo on the t4 are visible on the SOM, and vice versa,
Unfortunately I cannot use the GPIOs exposed on the SOM with A8.1, because of an SPI device that's mux'd with one of the available GPIOs, so I can't simply remap the GPIO pins. (and making a hardware mod on a 240pin connector is tricky too!)
Is there an easy way to change this? I haven't found anything obvious in the Android8.1 build tree, so if someone can point me in the right direction there, that would be greatly appreciated.
Best,
Maya
I've developed my own baseboard for the som-rk3399 and prototyped software with the nanopc-t4 while the hardware was being designed/built/debugged.
While the schematic for the SOM lists all the same GPIO pins as the t4, none of the GPIO pins in the GPIO demo on the t4 are visible on the SOM, and vice versa,
Unfortunately I cannot use the GPIOs exposed on the SOM with A8.1, because of an SPI device that's mux'd with one of the available GPIOs, so I can't simply remap the GPIO pins. (and making a hardware mod on a 240pin connector is tricky too!)
Is there an easy way to change this? I haven't found anything obvious in the Android8.1 build tree, so if someone can point me in the right direction there, that would be greatly appreciated.
Best,
Maya