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