Skip to content

Latest commit

 

History

History
43 lines (30 loc) · 1.25 KB

README.md

File metadata and controls

43 lines (30 loc) · 1.25 KB
Raw

GPIO heartbeat

This module provides a continuous heartbeat signal on a GPIO pin. It can be used as optical signal that the Kernel is alive, by connecting an LED to the GPIO pin.

Whenever the module is loaded, the GPIO pin periodically toggles on/off simulating a heartbeat like pluse signal.

Educational example - use leds-gpio module in production

This module is a simple educational example of a minimal Kernel module with GPIO platform device and and Kernel thread. The Linux Kernel has the same functionality available in the gpio-led module with the heartbeat trigger.

Compile

This module is developed as an out of tree module and can be compiled with an existing Kernel source tree or the corresponding headers.

make

This builds the module for the currently booted (uname -r) Kernel. To install run make install.

Device tree support

The module can be used as a platform driver with automated early loading using a device tree entry like the following.

    gpio-heartbeat {
        compatible = "gpio-heartbeat";
        status = "okay";
    };

License

This module uses the same license as the Linux Kernel. See COPYING for details.