KasperskyOS Community Edition 1.1

gpio_echo example

Example use of the GPIO driver.

This example makes it possible to verify the functionality of GPIO pins as well as the operation of GPIO interrupts. The "gpio0" port is used. The output pin (GPIO_PIN_OUT) should be connected to the input pin (GPIO_PIN_IN). The output pin (the pin number is defined in the GPIO_PIN_OUT macro) as well as the input pin (GPIO_PIN_IN) are configured. Use of the input pin is configured in the IN_MODE macro. The interrupt handler for the input pin is registered. The state of the output pin changes several times. If the example works correctly, then when the state of the output pin changes the interrupt handler will be called and will display the state of the input pin. What's more, the state of the output pin and the input pin must match.

If you build and run this example on QEMU, an error will occur. This is the expected behavior, because there is no GPIO driver for QEMU.

If you build and run this example on Raspberry Pi 4 B, an error will occur.

Example files

The code of the example and build scripts are available at the following path:

Building and running example

See Building and running examples section.