7. Application Demo: Building a Ranging Sensor Kernel Module
The chapter demonstrates the creation of a kernel module for a ranging sensor, specifically leveraging an ultrasonic sensor for distance measurement. Emphasizing the interaction with hardware GPIO pins, it guides through writing, compiling, and interfacing user-space applications with the sensor data through device files, showcasing practical kernel module development in Linux.
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Sections
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What we have learnt
- Kernel modules can interact with hardware devices directly.
- The kernel module for the ultrasonic sensor can read and process distance measurements.
- User-space applications can access kernel-level functionalities via device files.
Key Concepts
- -- Kernel Module
- A piece of code that can be loaded into the Linux kernel to extend its functionality, especially with hardware devices.
- -- GPIO
- General Purpose Input/Output; it is a pin on an integrated circuit or device that can be configured as an input or output.
- -- Distance Measurement
- The process of calculating the distance based on the time taken for sound waves to return after being emitted.
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