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You're reading from  Linux Device Drivers Development

Product typeBook
Published inOct 2017
Reading LevelIntermediate
PublisherPackt
ISBN-139781785280009
Edition1st Edition
Languages
C
Tools
Ubuntu Server
Concepts
System Administration
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Author (1)
John Madieu
John Madieu
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John Madieu

John Madieu is an embedded Linux and kernel engineer living in Paris, France. His main activities consist of developing device drivers and Board Support Packages (BSPs) for companies in domains such as IoT, automation, transport, healthcare, energy, and the military. John is the founder and chief consultant at LABCSMART, a company that provides training and services for embedded Linux and Linux kernel engineering. He is an open source and embedded systems enthusiast, convinced that it is only by sharing knowledge that we can learn more. He is passionate about boxing, which he practiced for 6 years professionally, and continues to channel this passion through training sessions that he provides voluntarily.
Read more about John Madieu

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Triggered buffer support

In many data analysis applications, it is useful to be able to capture data based on some external signal (trigger). These triggers might be:

  • A data ready signal
  • An IRQ line connected to some external system (GPIO or something else)
  • On-processor periodic interrupt
  • User space reading/writing a specific file in sysfs

IIO device drivers are completely unrelated to triggers. A trigger may initialize data capture on one or many devices. These triggers are used to fill buffers, exposed to the user space as character devices.

You can develop your own trigger driver, but that is beyond the scope of this book. We will try to focus on existing ones only. These are:

  • iio-trig-interrupt: This provides support for using any IRQ as IIO triggers. In old kernel versions, it used to be iio-trig-gpio. The kernel option to enable this trigger mode is CONFIG_IIO_INTERRUPT_TRIGGER...
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Linux Device Drivers Development
Published in: Oct 2017Publisher: PacktISBN-13: 9781785280009
© 2017 Packt Publishing Limited All Rights Reserved

Author (1)

author image
John Madieu

John Madieu is an embedded Linux and kernel engineer living in Paris, France. His main activities consist of developing device drivers and Board Support Packages (BSPs) for companies in domains such as IoT, automation, transport, healthcare, energy, and the military. John is the founder and chief consultant at LABCSMART, a company that provides training and services for embedded Linux and Linux kernel engineering. He is an open source and embedded systems enthusiast, convinced that it is only by sharing knowledge that we can learn more. He is passionate about boxing, which he practiced for 6 years professionally, and continues to channel this passion through training sessions that he provides voluntarily.
Read more about John Madieu

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