Example use of the GPIO driver.
This example lets you verify the functionality of GPIO output pins. The "gpio0" port is used. The initial state of all GPIO pins should correspond to a logical zero (no voltage on the pin). All pins other than those indicated in the exceptionPinArr array are configured for output. Each pin, starting with GPIO0 (accounting for those indicated in the exceptionPinArr array), will be sequentially changed to a logical one (voltage on the pin) and then to a logical zero. The delay between the changes of pin state is determined by the DELAY_S macro (the time is indicated in seconds). The pins are turned on/off from GPIO0 to GPIO27 and then back against to GPIO0.
exceptionPinArr is an array of GPIO pin numbers that need to be excluded from the example. This may be necessary if some pins are already being used for other functions, e.g. if pins are being used for a UART connection during debugging.
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:
/opt/KasperskyOS-Community-Edition-<version>/examples/gpio_output
Building and running example
See Building and running examples section.
Page top