imported>Fstuess |
imported>Fstuess |
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| </nowiki>}} | | </nowiki>}} |
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| ==== Gpio and 1-wire ==== | | ==== Gpio ==== |
| Add gpio group and change permission for all users in new gpio group. | | Add gpio group and change permission for all users in new gpio group. |
| Additionally, an example of putting in a device tree snippet. 1-wire without pullup in this case.
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| Now all users in gpio group have access to /dev/gpiomem and to gpio pins via sysfs. | | Now all users in gpio group have access to /dev/gpiomem and to gpio pins via sysfs. |
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| }; | | }; |
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| # insert device tree snippet for 1-wire
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| hardware.deviceTree = {
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| enable = true;
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| overlays = [
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| {
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| name = "w1-gpio-overlay";
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| dtsText = ''
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| /dts-v1/;
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| /plugin/;
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|
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| / {
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| compatible = "brcm,bcm2711";
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|
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| fragment@0 {
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| target-path = "/";
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| __overlay__ {
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|
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| w1: onewire@0 {
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| compatible = "w1-gpio";
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| pinctrl-names = "default";
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| pinctrl-0 = <&w1_pins>;
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| gpios = <&gpio 4 0>;
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| rpi,parasitic-power = <0>;
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| status = "okay";
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| };
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| };
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| };
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|
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| fragment@1 {
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| target = <&gpio>;
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| __overlay__ {
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| w1_pins: w1_pins {
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| brcm,pins = <4>;
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| brcm,function = <0>; // in (initially)
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| brcm,pull = <0>; // off
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| };
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| };
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| };
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|
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| __overrides__ {
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| gpiopin = <&w1>,"4",
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| <&w1_pins>,"brcm,pins:0";
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| pullup = <&w1>,"rpi,parasitic-power:0";
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| };
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| };
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|
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| '';
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| }
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| ];
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| };
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| </nowiki>}} | | </nowiki>}} |
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