June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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LEDs
LEDs are often controlled though a GPIO pin, but there is another kernel subsystem that offers more specialized control specific to the purpose. The leds kernel subsystem adds the ability to set brightness, should the LED have that ability, and it can handle LEDs connected in other ways than a simple GPIO pin. It can be configured to trigger the LED on an event such as block device access or just a heartbeat to show that the device is working. You will have to configure your kernel with the option, CONFIG_LEDS_CLASS, and with the LED trigger actions that are appropriate to you. There is more information on Documentation/leds/, and the drivers are in drivers/leds/.
As with GPIOs, LEDs are controlled through an interface in sysfs in the ...
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