Ned Konz / Mbed 2 deprecated Multi_WS2811_test

Test program for my Multi_WS2811 library that started out as a fork of heroic/WS2811. My library uses hardware DMA on the FRDM-KL25Z to drive up to 16 strings of WS2811 or WS2812 LEDs in parallel.

Dependencies:   Multi_WS2811 mbed MMA8451Q

Fork of WS2811 by Heroic Robotics

NOTE: I have accidentally pushed changes for another fork of this program that I used in the recent Georgetown Carnival Power Tool Races. When I get some time, I will restore the test program to its original glory.

You can see my power tool racer (Nevermore's Revenge) here

/media/uploads/bikeNomad/img_0482.jpg

This tests my FRDM-KL25Z multi-string WS2811/WS2812 library. It uses the accelerometer to change the rainbow phase on two strings of LEDs as well as the touch sense to change brightness.

A video of this program in operation is here.

Here is the library that I developed to run the LEDs:

Import libraryMulti_WS2811

Library allowing up to 16 strings of 60 WS2811 or WS2812 LEDs to be driven from a single FRDM-KL25Z board. Uses hardware DMA to do a full 800 KHz rate without much CPU burden.

Last commit 13 Jun 2015 by Ned Konz

audio.cpp

Committer:
Ned Konz
Date:
2016-06-10
Revision:
40:d5c8ce80b6c4

File content as of revision 40:d5c8ce80b6c4:

#include "mbed.h"
#include "audio.h"

namespace NKAudio
{

AnalogOut speaker(AUDIO_DAC_PIN);
Ticker sampleTicker;

// audio samples
// class static
int8_t const * volatile AudioPlayer::nextSample;

// class static
uint16_t volatile AudioPlayer::samplesRemaining;

// interrupt handler
// class static
void AudioPlayer::playAudioSample()
{
    static uint16_t dcBias = DC_BIAS;
    if (samplesRemaining)
    {
        int8_t val     = *nextSample++;
        uint16_t val16 = dcBias + (val * 256);
        speaker.write_u16(val16);
        samplesRemaining--;
    }
    else
    {
        sampleTicker.detach();
        speaker.write_u16(dcBias);
    }
}

bool AudioPlayer::playAudio(int8_t const *start, uint16_t nsamples, AudioCallback cb)
{
    if (!audioDone())
    {
        return false;
    }
    nextSample       = start;
    samplesRemaining = nsamples;
    sampleTicker.attach_us(&playAudioSample, SAMPLE_PERIOD_US);
    while (samplesRemaining)
    {
        if (cb != NULL)
        {
            cb();
        }
        wait_us(AUDIO_WAIT_DURATION_US);
    }
    return true;
}

} // namespace NKAudio