Raspberry Piの GPIOでシャットダウン機能をスクリプト不要で有効にする、電源切断判別の LEDも！

Raspberry Pi 3の GPIOに LEDとスイッチを接続して Lチカする方法

$ uname -a
Linux raspberrypi 6.1.21-v7+ #1642 SMP Mon Apr  3 17:20:52 BST 2023 armv7l GNU/Linux

$ cat /proc/device-tree/model
Raspberry Pi 3 Model B Rev 1.2

　ラズパイ本体は Raspberry Pi 3Bで動作確認しました。

// LED 0="ON" 1="OFF"
#define GPIO_LED 22
// BUTTON 0="PUSH" 1="OPEN"
#define GPIO_BTN 27

[all]
dtoverlay=gpio-shutdown,gpio_pin=27,active_low=1,gpio_pull=up,debounce=3000

$ dtoverlay -h gpio-shutdown
Name:   gpio-shutdown

Info:   Initiates a shutdown when GPIO pin changes. The given GPIO pin
        is configured as an input key that generates KEY_POWER events.

        This event is handled by systemd-logind by initiating a
        shutdown. Systemd versions older than 225 need an udev rule
        enable listening to the input device:

                ACTION!="REMOVE", SUBSYSTEM=="input", KERNEL=="event*", \
                        SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", \
                        ATTRS{keys}=="116", TAG+="power-switch"

        Alternatively this event can be handled also on systems without
        systemd, just by traditional SysV init daemon. KEY_POWER event
        (keycode 116) needs to be mapped to KeyboardSignal on console
        and then kb::kbrequest inittab action which is triggered by
        KeyboardSignal from console can be configured to issue system
        shutdown. Steps for this configuration are:

            Add following lines to the /etc/console-setup/remap.inc file:

                # Key Power as special keypress
                keycode 116 = KeyboardSignal

            Then add following lines to /etc/inittab file:

                # Action on special keypress (Key Power)
                kb::kbrequest:/sbin/shutdown -t1 -a -h -P now

            And finally reload configuration by calling following commands:

                # dpkg-reconfigure console-setup
                # service console-setup reload
                # init q

        This overlay only handles shutdown. After shutdown, the system
        can be powered up again by driving GPIO3 low. The default
        configuration uses GPIO3 with a pullup, so if you connect a
        button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
        you get a shutdown and power-up button. Please note that
        Raspberry Pi 1 Model B rev 1 uses GPIO1 instead of GPIO3.

Usage:  dtoverlay=gpio-shutdown,<param>=<val>

Params: gpio_pin                GPIO pin to trigger on (default 3)
                                For Raspberry Pi 1 Model B rev 1 set this
                                explicitly to value 1, e.g.:

                                    dtoverlay=gpio-shutdown,gpio_pin=1

        active_low              When this is 1 (active low), a falling
                                edge generates a key down event and a
                                rising edge generates a key up event.
                                When this is 0 (active high), this is
                                reversed. The default is 1 (active low).

        gpio_pull               Desired pull-up/down state (off, down, up)
                                Default is "up".

                                Note that the default pin (GPIO3) has an
                                external pullup. Same applies for GPIO1
                                on Raspberry Pi 1 Model B rev 1.

        debounce                Specify the debounce interval in milliseconds
                                (default 100)

        This overlay only handles shutdown. After shutdown, the system
        can be powered up again by driving GPIO3 low. The default
        configuration uses GPIO3 with a pullup, so if you connect a
        button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
        you get a shutdown and power-up button.

        gpio_pull               Desired pull-up/down state (off, down, up)
                                Default is "up".

                                Note that the default pin (GPIO3) has an
                                external pullup. Same applies for GPIO1
                                on Raspberry Pi 1 Model B rev 1.

dtoverlay=gpio-shutdown

dtoverlay=gpio-shutdown,debounce=2000

ラズパイの中の人：6by9 Raspberry Pi Engineer & Forum Moderator
Pull ups for GPIOs 2&3 on the Pi4 are definitely 1k8 - I've just checked the full schematics for it. 1% 63mW M1005 if you really care.

Same is true for GPIOs 44&45 for I2C to the camera and display connectors.

Pi4 の GPIO 2&3 のプルアップは間違いなく 1k8 です - 完全な回路図を確認したところです。 本当に気になるなら1% 63mW M1005。

カメラおよびディスプレイ コネクタへの I2C 用の GPIO 44&45 にも同じことが当てはまります。

# ハートビート（死活確認）
sudo bash -c "echo dtparam=act_led_trigger=heartbeat >> /boot/config.txt"

Raspberry Pi 3をシャットダウンした時に電源が切れたかを簡単に確認する方法

Name:   gpio-poweroff
Info:   Drives a GPIO high or low on reboot

[all]
dtoverlay=gpio-shutdown,debounce=2000
dtoverlay=gpio-poweroff,gpiopin=22,active_low=1

[all]
dtoverlay=gpio-shutdown,debounce=2000
dtoverlay=gpio-poweroff,gpiopin=22,active_low=0

[all]
dtoverlay=gpio-shutdown,gpio_pin=27,active_low=1,gpio_pull=up,debounce=3000
dtoverlay=gpio-poweroff,gpiopin=22,active_low=1

[all]
# dtoverlay=gpio-shutdown,gpio_pin=27,active_low=1,gpio_pull=up,debounce=3000
dtoverlay=gpio-poweroff,gpiopin=22,active_low=0

[all]
dtoverlay=gpio-shutdown,debounce=2000
# dtoverlay=gpio-poweroff,gpiopin=22,active_low=1

[all]
# dtoverlay=gpio-shutdown,gpio_pin=27,active_low=1,gpio_pull=up,debounce=2000
dtoverlay=gpio-key,gpio=27,active_low=1,gpio_pull=up,lavel=POW,keycode=116

Name:   gpio-key
Info:   This is a generic overlay for activating GPIO keypresses using
        the gpio-keys library and this dtoverlay. Multiple keys can be
        set up using multiple calls to the overlay for configuring
        additional buttons or joysticks. You can see available keycodes
        at https://github.com/torvalds/linux/blob/v4.12/include/uapi/
        linux/input-event-codes.h#L64
Load:   dtoverlay=gpio-key,<param>=<val>
Params: gpio                    GPIO pin to trigger on (default 3)
        active_low              When this is 1 (active low), a falling
                                edge generates a key down event and a
                                rising edge generates a key up event.
                                When this is 0 (active high), this is
                                reversed. The default is 1 (active low)
        gpio_pull               Desired pull-up/down state (off, down, up)
                                Default is "up". Note that the default pin
                                (GPIO3) has an external pullup
        label                   Set a label for the key
        keycode                 Set the key code for the button

Name:   spi-gpio35-39
Info:   Move SPI function block to GPIO 35 to 39
Load:   dtoverlay=spi-gpio35-39
Params: <None>

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