Uwe: Created page with "Raspberry Pi offers hardware-based [https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#group_hardware_watchdog Watchdog functionality]. The watchdog is triggered when writing a first time to the `/dev/watchdog`. When the watchdog does not receive a heartbeat signal from the control application for 15 seconds, the watchdog will trigger a reboot of the system. When writing the character "V" to the watchdog file, the watchdog is deactivated. The c..."

2025-04-27T11:49:05Z

Created page with "Raspberry Pi offers hardware-based [https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#group_hardware_watchdog Watchdog functionality]. The watchdog is triggered when writing a first time to the <code>/dev/watchdog</code>. When the watchdog does not receive a heartbeat signal from the control application for 15 seconds, the watchdog will trigger a reboot of the system. When writing the character "V" to the watchdog file, the watchdog is deactivated. The c..."

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Raspberry Pi offers hardware-based [https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#group_hardware_watchdog Watchdog functionality].

The watchdog is triggered when writing a first time to the <code>/dev/watchdog</code>.
When the watchdog does not receive a heartbeat signal from the control application for 15 seconds, the watchdog will trigger a reboot of the system.
When writing the character "V" to the watchdog file, the watchdog is deactivated.

The control application allows the configuration of:
* activation of watchdog
* watchdog file name
* heartbeat string to be sent to device
* duration between heartbeat signals in milliseconds
* deactivation string to be sent to device (needs to be "V")

For testing purposes, one can stop the control application from sending a heartbeat signal to the watchdog, inducing a reset of the system: <code> aquarium_client watchdog stop </code>.

Communication with HW Watchdog - Revision history