zephyr

History

Anas Nashif 5060ca6a30 cmake: increase minimal required version to 3.13.1 Move to latest cmake version with many bug fixes and enhancements. Signed-off-by: Anas Nashif <anas.nashif@intel.com> Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>		2019-01-03 11:51:29 -05:00
..
src	samples: Add 'U' to unsigned variable assignments	2018-12-04 22:51:56 -05:00
CMakeLists.txt	cmake: increase minimal required version to 3.13.1	2019-01-03 11:51:29 -05:00
README.rst	doc: samples: Update samples to point to active boards	2018-12-12 23:06:16 +01:00
prj.conf	…
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	…
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