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README.md

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sample
Illustrates how to write a GPIO controller driver that works in conjunction with the GPIO framework extension (GpioClx).
cpp
windows
windows-wdk

GPIO Sample Drivers

The GPIO samples contain annotated code to illustrate how to write a GPIO controller driver that works in conjunction with the GPIO framework extension (GpioClx) to handle GPIO I/O control requests, and a peripheral driver that runs in kernel mode and uses GPIO resources.

The GPIO sample set contains the following samples:

Minifilter Sample description
SimGpio The files in this sample contain the source code for a GPIO controller driver that communicates with GpioClx through the GpioClx device driver interface (DDI). The GPIO controller driver is written for a hypothetical memory-mapped GPIO controller (simgpio). The code is meant to be purely instructional. An ASL file illustrates how to specify a GPIO interrupt and I/O descriptor in the ACPI firmware.
SimGpio_I2C The files in this sample contain the source code for a GPIO controller driver that communicates with GpioClx through the GpioClx DDI. In contrast to the SimGpio sample, the GPIO controller in this sample is not memory-mapped. The GPIO controller driver is written for a hypothetical GPIO controller that resides on an I2C bus (simgpio_i2c). The code is meant to be purely instructional. An ASL file illustrates how to specify a GPIO interrupt and I/O descriptor in the ACPI firmware.
SimDevice\kmdf The purpose of this sample is to show how a driver opens a device and performs I/O operations on a GPIO controller in kernel mode. Additionally, this sample demonstrates how the driver connects to a GPIO interrupt resource. The ASL file illustrates how to specify a GPIO interrupt and I/O descriptor in the ACPI firmware.
SimDevice\umdf The purpose of this sample is to show how a driver opens a device and performs I/O operations on a GPIO controller in user mode. Additionally, this sample demonstrates how the driver connects to a GPIO interrupt resource. The ASL file illustrates how to specify a GPIO interrupt and I/O descriptor in the ACPI firmware.
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