0059_DebugHAT_Shutdown.md

DebugHAT Shutdown

Debug HAT Shutdown按钮

参考文档

• 0029_Linux_Kernel_Compile.md
• 0045_SoC_Device_Tree.md
• 0006_Device_Tree_Overlays.md
• 0013_dtoverlay.md
• 0058_DebugHAT_Poweroff.md
• Raspberry pi powerdown and powerup button

配置、查看

• /boot/config.txt

  [...省略]
  enable_uart=1
  dtoverlay=rpi-at24c02
  dtoverlay=gpio-poweroff,gpiopin=9,export=1
  dtoverlay=gpio-shutdown,gpio_pin=8
  dtdebug=1
  

• reboot
• /sys/kernel/debug/gpio

  gpiochip0: GPIOs 0-53, parent: platform/fe200000.gpio, pinctrl-bcm2835:
   gpio-8   (                    |shutdown            ) in  hi IRQ
   gpio-9   (                    |power_ctrl          ) out lo
   gpio-42  (                    |led0                ) out lo
  
  gpiochip2: GPIOs 100-101, brcmvirt-gpio, can sleep:
  
  gpiochip1: GPIOs 504-511, parent: platform/soc:firmware:gpio, raspberrypi-exp-gpio, can sleep:
   gpio-504 (BT_ON               )
   gpio-505 (WL_ON               )
   gpio-506 (PWR_LED_OFF         |led1                ) out lo
   gpio-507 (GLOBAL_RESET        )
   gpio-508 (VDD_SD_IO_SEL       |vdd-sd-io           ) out hi
   gpio-509 (CAM_GPIO            )
   gpio-510 (                    )
   gpio-511 (                    )
  

测试方法

按一下对应的按键，由高电平拉到低电平，系统会关机

gpio-shutdown-overlay.dts

• arm/boot/dts/overlays/gpio-shutdown-overlay.dts