zephyr

History

Carles Cufi b51b7becf4 doc: samples: Update samples to point to active boards Since the Arduino 101 and the Quark SE C1000 are not actively developed boards, default to other boards that are maintained and used. Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>		2018-12-12 23:06:16 +01:00
..
src	samples: Add 'U' to unsigned variable assignments	2018-12-04 22:51:56 -05:00
CMakeLists.txt	samples, tests: Use semi-accurate project names	2018-10-27 21:31:25 -04:00
README.rst	doc: samples: Update samples to point to active boards	2018-12-12 23:06:16 +01:00
prj.conf	driver: pwm: use new logger	2018-10-08 17:49:12 -04:00
prj_nrf52832_mdk.conf	samples: blink_led: make it work for nrf52832-mdk	2018-10-17 12:51:22 -05:00
prj_nrf52840_mdk.conf	samples: blink_led: make it work for nrf52840-mdk	2018-10-17 12:51:22 -05:00
prj_nrf52840_pca10056.conf	driver: pwm: use new logger	2018-10-08 17:49:12 -04:00
sample.yaml	samples: blink_led: make it work for nrf52832-mdk	2018-10-17 12:51:22 -05:00

README.rst

.. _blink-led-sample:

PWM: Blink LED
##############

Overview
********

This is a sample app which blinks a LED using PWM.

The LED will start at a blinking frequency of 1 Hz. Every 4 seconds,
the blinking frequency will double. When the blinking frequency
reaches 64 Hz, the blinking frequency will be halved every 4 seconds
until the blinking frequency reaches 1 Hz. This completes a whole
blinking cycle. This faster-then-slower LED blinking cycle repeats forever.

Wiring
******

Nucleo_F401RE, Nucleo_L476RG, STM32F4_DISCOVERY, Nucleo_F302R8
==============================================================
Connect PWM2(PA0) to LED

Nucleo_F103RB
=============
Connect PWM1(PA8) to LED

Hexiwear K64
============
No special board setup is necessary because there is an on-board RGB LED
connected to the K64 PWM.

nrf52840_pca10056
=================
No special board setup is necessary because there is an on-board LED connected.

Arduino 101 and Quark D2000 CRB
===============================
You will need to connect the LED to ground and PWM0 via the shield.
You may need a current limiting resistor. See your LED datasheet.

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

This sample can be built for multiple boards, in this example we will build it
for the arduino_101 board:

.. zephyr-app-commands::
   :zephyr-app: samples/basic/blink_led
   :board: nrf52840_pca10056
   :goals: build flash
   :compact:

After flashing the image to the board, the user LED on the board should start to
blinking as discussed in overview