HI v8dave I have the same problem with the SPI bus. I have also rebuilt the operating system to activate spidev1. I enable chmod 777 permissions from boot to read and write. in my android application I am using the FriendlyArm library (libfriendlyarm-things.so). I can open and close the bus, but I c...

Hi v8dave
thank you for your support.

the i2c3 port is working now

I had a mistake on the android java code. with the number assigned to the i2c port.

with the previous post it is more than enough to activate the i2c3 port.

best regards

Hi v8dave I Added for permissions after the ‘on boot’ section in the following files: o Files: • device/rockchip/common/recovery/etc/init.rc • device/rockchip/rk3399/init.rk3399.rc • system/core/rootdir/init.rc o Lines: #Coffee-Electronics chown system system /dev/i2c-2 chmod 777 /dev/i2c-2 #Coffee-...

HI everyone I am working on the Nano PC - T4 with android 8 and Android 10 . How can I activate the i2c3 form the source code?. I implemented the following lines on the file /path/Android/kernel/arch/arm64/boot/dts/rockchip/ rk3399-nanopi4-common.dtsi &i2c3 { status = "okay"; }; but on...