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

WS2812.cpp

Committer:
bikeNomad
Date:
2013-12-05
Revision:
15:331e139672b5

File content as of revision 15:331e139672b5:

// 800 KHz WS2812 driver, kinda.
//
// Parameterized and modified to use soft SPI.
// Jas Strong <jasmine@electronpusher.org>
// Modified to use hard SPI by Ned Konz <ned@bike-nomad.com>
/*****************************************************************************/

#include "LedStrip.h"
#include "WS2812.h"

WS2812::WS2812(int n, PinName mosi, PinName sclk) :
    LedStrip(n),
    spi(mosi, NC, sclk)
{
#ifdef TARGET_KL25Z
    spi.format(8, 3);
#else
    spi.format(16, 3);
#endif
    spi.frequency(800e3 * 16);  // 12.8 MHz => 800KHz bit rate
}

/*
 *  These chips use a one-wire protocol based on a sort of NRZ signalling- jas.
 */

inline void WS2812::writebit(bool bit)
{
    if (bit) {
#ifdef TARGET_KL25Z
        spi.write(0xff);    // 8 high
        spi.write(0x00);    // 8 low
#else
        spi.write(0xff00);
#endif
    } else {
#ifdef TARGET_KL25Z
        spi.write(0xe0);    // 3 high, 5 low
        spi.write(0x00);    // +8 low
#else
        spi.write(0xe000);
#endif
    }
}

void WS2812::write(uint8_t byte)
{
    writebit(byte & 0x80);
    writebit(byte & 0x40);
    writebit(byte & 0x20);
    writebit(byte & 0x10);
    writebit(byte & 0x08);
    writebit(byte & 0x04);
    writebit(byte & 0x02);
    writebit(byte & 0x01);
}

void WS2812::begin(void)
{
    blank();
    show();
}

void WS2812::blank(void)
{
    memset(pixels, 0x00, numPixelBytes());
}

void WS2812::show(void)
{
    uint16_t i, nl3 = numPixelBytes(); // 3 bytes per LED
    while (guardtime.read_us() < 50)
        /* spin */;
    __disable_irq();
    for (i=0; i<nl3; i++ ) {
        write(pixels[i]);
    }
    __enable_irq();
    guardtime.reset();
}