0

Accessing the hardware PWM Peripheral on the Raspberry Pi in C++ #piday #raspberrypi @Raspberry_Pi

NewImage

Via Hertaville.

In this Blog entry I will demonstrate how to access the single hardware pulse width modulation (PWM) channel available on the Raspberry Pi. The BCM2835 SOC on the Raspberry Pi has two PWM peripherals; PWM1 & PWM2. Only the PWM1 peripheral can be mapped onto a GPIO pin (GPIO18) available on the RPi’s 26-pin header. It’s important to note that both the PWM1 & PWM2 peripherals are used by Raspbian to generate audio, so make sure that the RPI is not generating audio while accessing the PWM peripherals. Since Raspbian/ Linux already assigns the PWM peripherals for audio generation, there’s strictly no direct ‘proper’ way to access the PWM1 peripheral from userspace without accessing the hardware registers directly by ‘mmaping into /dev/mem’.

See the full tutorial here.


998Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!


Join 5,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython in 2018 – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — The first step in making: a PCB

Wearables — Try maximum twinkling

Electronics — Behold…the power of pseudocode.

Biohacking — All Day EEG Recording Tools

Python for Microcontrollers — PyCon US 2018 Rocked!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.