README.md
system
This document describes some basics for developers.
The gobot package name is a little bit misleading, because also contains
/dev/i2c-*usage with syscall for i2c interface and the file system mock for unit testing.
Change available features on TinkerOS (Tinkerboard)
Open the file /boot/config.txt and add lines/remove comment sign. Then save the file, close and reboot.
For PWM on TinkerOS (Tinkerboard)
intf:pwm2=on intf:pwm3=on
For i2c on TinkerOS (Tinkerboard)
intf:i2c1=on intf:i2c4=on
Device tree overlays can also be provided, e.g. "overlay=i2c-100kbit-tinker-overlay".
Create a dts-file "i2c1-100kbit-tinker-overlay.dts" with this content:
// Definitions for i2c1 with 100 kbit
/dts-v1/;
/plugin/;
/ {
compatible = "rockchip,rk3288-evb-rk808-linux", "rockchip,rk3288";
fragment@0 {
target = <&i2c1>;
__overlay__ {
status = "okay";
clock-frequency = <100000>;
};
};
};
Compile the tree overlay:
dtc -@ -I dts -O dtb -o i2c1-100kbit-tinker-overlay.dtbo i2c1-100kbit-tinker-overlay.dts
Copy the file to "/boot/overlays/i2c-100kbit-tinker-overlay.dtbo"
Package "device-tree-compiler" needs to be installed for "dtc" command.
Change available features on raspi
Start "raspi-config" and go to the menu "interface options". After change something save and reboot the device.
Change available features on armbian
Install the armbian-config utility (howto is shown after each login) and start it.
For i2c on armbian
Open the related menu entry and activate/deactivate the needed features.
For PWM on armbian
Go to the device tree menu - this opens the device tree for editing.
Looking for the pwm entries. There are some marked with "disabled". Change the entry to "okay" for your needed pwm.
Example for Tinkerboard:
ff680020 => pwm2, pin33 ff680030 => pwm3, pin32