zephyr

History

Kumar Gala db167c606d dts: Rename LED._GPIO_* -> DT_ALIAS_LED._GPIOS_* We use the following commands to rename any LED._GPIO_{CONTROLLER,PIN,FLAGS} to DT_ALIAS_LED._GPIOS_{CONTROLLER,PIN,FLAGS} git grep -l LED._GPIO_CONTROLLER \| xargs sed -i 's/LED\(.\)_GPIO_CONTROLLER/DT_ALIAS_LED\1_GPIOS_CONTROLLER/g' git grep -l LED._GPIO_PIN \| xargs sed -i 's/LED\(.\)_GPIO_PIN/DT_ALIAS_LED\1_GPIOS_PIN/g' git grep -l LED._GPIO_FLAGS \| xargs sed -i 's/LED\(.\)_GPIO_FLAGS/DT_ALIAS_LED\1_GPIOS_FLAGS/g' Signed-off-by: Kumar Gala <kumar.gala@linaro.org>		2019-07-02 08:26:37 -04:00
..
src	dts: Rename LED._GPIO_* -> DT_ALIAS_LED._GPIOS_*	2019-07-02 08:26:37 -04:00
CMakeLists.txt	license: cleanup: add SPDX Apache-2.0 license identifier	2019-04-07 08:45:22 -04:00
README.rst	doc: use :zephyr_file: where appropriate	2019-03-09 09:50:27 -05:00
prj.conf	samples: basic: disco_led without gpio driver	2019-03-26 09:00:44 -05:00
sample.yaml	dts: Rename LED._GPIO_* -> DT_ALIAS_LED._GPIOS_*	2019-07-02 08:26:37 -04:00

README.rst

.. _disco-sample:

Disco demo
##########

Overview
********

A simple 'disco' demo. The demo assumes that 2 LEDs are connected to
GPIO outputs of the MCU/board.


Wiring
******

This sample should work on board with multiple built-in LEDs without any
changes, otherwise, the code may need some changes before running on various
board: set PORT, LED0 and LED1 according to the board's GPIO configuration.

Building and Running
*********************

After startup, the program looks up a predefined GPIO device defined by 'PORT',
and configures pins 'LED0' and 'LED1' in output mode.  During each iteration of
the main loop, the state of GPIO lines will be changed so that one of the lines
is in high state, while the other is in low, thus switching the LEDs on and off
in an alternating pattern.

This project does not output to the serial console, but instead causes two LEDs
connected to the GPIO device to blink in an alternating pattern.

The sample can be found here: :zephyr_file:`samples/basic/disco`.