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.
Revision 0:12e734116fea, committed 2011-12-16
- Comitter:
- ehbmbed2
- Date:
- Fri Dec 16 03:16:50 2011 +0000
- Child:
- 1:6ebd3ac910b6
- Commit message:
- first revision, works, needs to be tested on long strands
Changed in this revision
LPD8806.cpp | Show annotated file Show diff for this revision Revisions of this file |
LPD8806.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LPD8806.cpp Fri Dec 16 03:16:50 2011 +0000 @@ -0,0 +1,85 @@ +// Mbed library to control LPD8806-based RGB LED Strips +// (c) 2011 Jelmer Tiete +// This library is ported from the Arduino implementation of Adafruit Industries +// found at: http://github.com/adafruit/LPD8806 +// and their strips: http://www.adafruit.com/products/306 +// Released under the MIT License: http://mbed.org/license/mit + +/*****************************************************************************/ + +#include "LPD8806.h" + +//Define SPI pins +SPI spi(p5, p6, p7); // mosi, miso, sclk +//SPI spi(p11, p12, p13); // mosi, miso, sclk + +LPD8806::LPD8806(uint16_t n) { + // Allocate 3 bytes per pixel: + if (NULL != (pixels = (uint8_t *)malloc(numLEDs * 3))) { + memset(pixels, 0x80, numLEDs * 3); // Init to RGB 'off' state + numLEDs = n; + } +} + +void LPD8806::begin(void) { + + // Setup the spi for 8 bit data, low steady state clock, + // first edge capture, with a 2MHz clock rate + spi.format(8,0); + spi.frequency(2000000); + + // Issue initial latch to 'wake up' strip (latch length varies w/numLEDs) + writezeros(3 * ((numLEDs + 63) / 64)); +} + +uint16_t LPD8806::numPixels(void) { + return numLEDs; +} + +void LPD8806::writezeros(uint16_t n) { + while (n--) spi.write(0x00); +} + +// This is how data is pushed to the strip. Unfortunately, the company +// that makes the chip didnt release the protocol document or you need +// to sign an NDA or something stupid like that, but we reverse engineered +// this from a strip controller and it seems to work very nicely! +void LPD8806::show(void) { + uint16_t i, nl3 = numLEDs * 3; // 3 bytes per LED + + for (i=0; i<nl3; i++ ) { + spi.write(pixels[i]); + } + + // Write latch at end of data; latch length varies with number of LEDs + writezeros(3 * ((numLEDs + 63) / 64)); + + // We need to have a delay here, a few ms seems to do the job + // shorter may be OK as well - need to experiment :( +// wait_ms(3); +} + +// Convert R,G,B to combined 32-bit color +uint32_t LPD8806::Color(uint8_t r, uint8_t g, uint8_t b) { + // Take the lowest 7 bits of each value and append them end to end + // We have the top bit set high (its a 'parity-like' bit in the protocol + // and must be set!) + return 0x808080 | ((uint32_t)g << 16) | ((uint32_t)r << 8) | (uint32_t)b; +} + +// store the rgb component in our array +void LPD8806::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b) { + if (n >= numLEDs) return; // '>=' because arrays are 0-indexed + + pixels[n*3 ] = g | 0x80; + pixels[n*3+1] = r | 0x80; + pixels[n*3+2] = b | 0x80; +} + +void LPD8806::setPixelColor(uint16_t n, uint32_t c) { + if (n >= numLEDs) return; // '>=' because arrays are 0-indexed + + pixels[n*3 ] = (c >> 16) | 0x80; + pixels[n*3+1] = (c >> 8) | 0x80; + pixels[n*3+2] = c | 0x80; +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LPD8806.h Fri Dec 16 03:16:50 2011 +0000 @@ -0,0 +1,39 @@ +// Mbed library to control LPD8806-based RGB LED Strips +// (c) 2011 Jelmer Tiete +// This library is ported from the Arduino implementation of Adafruit Industries +// found at: http://github.com/adafruit/LPD8806 +// and their strips: http://www.adafruit.com/products/306 +// Released under the MIT License: http://mbed.org/license/mit + +/*****************************************************************************/ + +#include "mbed.h" +#ifndef MBED_LPD8806_H +#define MBED_LPD8806_H + +class LPD8806 { + + public: + + LPD8806(uint16_t n); + void + begin(void), + show(void), + setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b), + setPixelColor(uint16_t n, uint32_t c); + uint16_t + numPixels(void); + uint32_t + Color(uint8_t, uint8_t, uint8_t); + + private: + + uint8_t + *pixels; // Holds LED color values + uint16_t + numLEDs; // Number of RGB LEDs in strand + + void + writezeros(uint16_t n); +}; +#endif \ No newline at end of file