85 lines
2.1 KiB
Markdown
85 lines
2.1 KiB
Markdown
# system
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This document describes some basics for developers.
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> The gobot package name is a little bit misleading, because also contains `/dev/i2c-*` usage with syscall for i2c
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> interface and the file system mock for unit testing.
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## Change available features on TinkerOS (Tinkerboard)
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Open the file /boot/config.txt and add lines/remove comment sign. Then save the file, close and reboot.
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### For PWM on TinkerOS (Tinkerboard)
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intf:pwm2=on
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intf:pwm3=on
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### For i2c on TinkerOS (Tinkerboard)
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intf:i2c1=on
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intf:i2c4=on
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Device tree overlays can also be provided, e.g. "overlay=i2c-100kbit-tinker-overlay".
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Create a dts-file "i2c1-100kbit-tinker-overlay.dts" with this content:
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```c
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// Definitions for i2c1 with 100 kbit
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "rockchip,rk3288-evb-rk808-linux", "rockchip,rk3288";
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fragment@0 {
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target = <&i2c1>;
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__overlay__ {
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status = "okay";
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clock-frequency = <100000>;
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};
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};
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};
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```
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Compile the tree overlay:
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```sh
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dtc -@ -I dts -O dtb -o i2c1-100kbit-tinker-overlay.dtbo i2c1-100kbit-tinker-overlay.dts
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```
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Copy the file to "/boot/overlays/i2c-100kbit-tinker-overlay.dtbo"
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> Package "device-tree-compiler" needs to be installed for "dtc" command.
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## Change available features on raspi
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Start "raspi-config" and go to the menu "interface options". After change something save and reboot the device.
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## Change available features on armbian
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Install the armbian-config utility (howto is shown after each login) and start it.
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### For i2c on armbian
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Open the related menu entry and activate/deactivate the needed features.
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### For PWM on armbian
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Go to the device tree menu - this opens the device tree for editing.
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Looking for the pwm entries. There are some marked with "disabled". Change the entry to "okay" for your needed pwm.
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Example for Tinkerboard:
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ff680020 => pwm2, pin33
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ff680030 => pwm3, pin32
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## Next steps for developers
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* test [gpio](GPIO.md)
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* test [pwm](PWM.md)
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* background information for [i2c](I2C.md) in gobot
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## Links
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* <https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc8x/bsp_r_create-dt-overlays>
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