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
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
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.
Diff: audio.cpp
- Revision:
- 40:d5c8ce80b6c4
diff -r e735259e1d2e -r d5c8ce80b6c4 audio.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/audio.cpp Fri Jun 10 08:56:46 2016 -0700 @@ -0,0 +1,56 @@ +#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