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RIOT/tests/pkg_ucglib/README.md

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# Ucglib Package Test
## About
This is a test application for the Ucglib package. This package is a graphical color display library, including display drivers.
## Usage
This test application will initialize the Ucglib to output on one of the following:
* output to dummy screen.
* output to SDL virtual screen.
* output to SPI graphics screen.
Note: you may have to run `make clean` between different output modes.
### Output to dummy
To output to this virtual screen, supply `TEST_OUTPUT=1` to the `make` command.
It logs internal calls to screen and is used for testing the package internals only.
### Output to SDL
To output to this virtual screen, supply `TEST_OUTPUT=2` to the `make` command.
This is a native-only option and requires SDL2 (32-bits) to be installed.
### Output to SPI
To output to screen, supply `TEST_OUTPUT=3` to the `make` command.
* `TEST_SPI` — The SPI device.
* `TEST_PIN_CS` — If applicable, the CS pin.
* `TEST_PIN_CD` — If applicable, the Command/Data pin.
* `TEST_PIN_RESET` — If applicable, the reset pin.
* `TEST_DISPLAY` — The used display driver (see https://github.com/olikraus/ucglib/wiki/displays). Make sure you select a SPI compatible display.
* `TEST_DISPLAY_EXT` — The applicable display extension (additional commands).
## Expected result
The output of this test depends on the output mode and used hardware. If it works, the application cycles through three screens with the text: 'This is RIOT-OS'.