GPIO access on UP4000

arnaudg
arnaudg New Member Posts: 1 ✭
in UP 4000 Linux

I'm trying to use the GPIOs for the UP4000 with Ubunto 20.04

I've installed the kernel 5.4.0 from PPA and the upboard-extras
I've created the GPIO, LED,... groups
But when I try to access the

cd /sys/class/gpio
root@up01:/sys/class/gpio# echo 432 > export
-bash: echo: write error: Invalid argument

If I use gpiodetect from pinctrl, I can well see the GPIO but I get errors doing accesses

arnaud@up01:/sys/class/gpio$ gpiodetect 
gpiochip0 [INT3452:00] (78 lines)
gpiochip1 [INT3452:01] (77 lines)
gpiochip2 [INT3452:02] (47 lines)
gpiochip3 [INT3452:03] (43 lines)
gpiochip4 [Raspberry Pi compatible UP GPIO] (28 lines)
gpiochip6 [ftdi-cbus] (4 lines)
arnaud@up01:/sys/class/gpio$ gpioget gpiochip4 0
gpioget: error reading GPIO values: Unknown error 517

The control of the LED is working well.
Is there some extra steps to do to get these working?

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