NeoPixel.md

NeoPixel Driver

The NeoPixel driver can be used to control a single line of NeoPixels attached to a given GPIO pin.

To use it in your own programs, add the neopixel to your target list of library dependencies.

The following demonstrate a typical usage:

Add the following include:

#include "devices/neopixel/NeoPixel.h"

First, instantiate a NeoPixel device:

// pioDevice must be pio0 or pio1. stateMachine is the
// state machine index (0 to 3)
NeoPixel np(pin, numLEDs, pioDevice, stateMachine);

To change the display, push the colors to the np object and then send the data to the pixel chain. For example, for 3 pixels, to have the first one red, the second green and the last one blue, use:

np.clear(); // First clear previous data
np.push_back({128,0,0}); // Half brightness red
np.push_back({0,128,0}); // Green
np.push_back({0,0,128}); // Blue
co_await np.show(); // Asynchronously send the data to the pixel chain

Note: The library currently assume you have RGB pixels and they expect a 800kHz signal.