mirror of
https://github.com/zephyrproject-rtos/zephyr
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4cc91fdd00
convert sample and test yaml filters that utilize a DT_ define to instead use a dt_ function. The intent is to remove the Kconfig generated DT defines and just make directy queries into the device tree. Signed-off-by: Kumar Gala <kumar.gala@linaro.org> |
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.. _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 Nucleo_L496ZG ============= No special board setup is necessary because there are three on-board LEDs (red, green, blue) connected to the Nucleo's PWM. 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. Building and Running ******************** This sample can be built for multiple boards, in this example we will build it for the nrf52840_pca10056 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