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RIOT/tests/periph/gpio_arduino/README.md

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# Arduino peripheral GPIO Test
This test is designed for testing the Arduino to RIOT pin mapping
on boards with Arduino support. It is much like tests/periph/gpio
but for Arduino pin numbers.
In this test, pins are specified by integer pin numbers.
It uses a single integer to indicate the arduino digital pin.
At this point the Analog pins are not supported.
## Commands
`init_out <pin>`
init as output (push-pull mode)
`init_in <pin>`
init as input w/o pull resistor
`init_in_pu <pin>`
init as input with pull-up
`read <pin>`
read pin status
`set <pin>`
set pin to HIGH
`clear <pin>`
set pin to LOW
`toggle <pin>`
toggle pin
## Example
Blink the Arduino UNO led once.
```
2018-08-06 09:00:32,673 - INFO # main(): This is RIOT! (Version: 2018.10-devel-338-g2c8a2-z400-periph_gpio_arduino)
2018-08-06 09:00:32,722 - INFO # Arduino GPIO peripheral driver test. ? for help
> ?
2018-08-06 09:00:38,347 - INFO # help
2018-08-06 09:00:38,383 - INFO # Command Description
2018-08-06 09:00:38,424 - INFO # ---------------------------------------
2018-08-06 09:00:38,478 - INFO # init_out init as output (push-pull mode)
2018-08-06 09:00:38,535 - INFO # init_in init as input w/o pull resistor
2018-08-06 09:00:38,584 - INFO # init_in_pu init as input with pull-up
2018-08-06 09:00:38,621 - INFO # read read pin status
2018-08-06 09:00:38,662 - INFO # set set pin to HIGH
2018-08-06 09:00:38,699 - INFO # clear set pin to LOW
2018-08-06 09:00:38,732 - INFO # toggle toggle pin
> init_out 13
2018-08-06 09:00:45,363 - INFO # init_out 13
> toggle 13
2018-08-06 09:00:50,897 - INFO # toggle 13
> toggle 13
2018-08-06 09:00:53,568 - INFO # toggle 13
> /exit
```