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 2:af5af64e114d, committed 2012-09-16
- Comitter:
- heroic
- Date:
- Sun Sep 16 13:09:54 2012 +0000
- Parent:
- 1:6ebd3ac910b6
- Child:
- 3:a415f73507c9
- Commit message:
- Add extra functions and parameterize; support software SPI.
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 |
--- a/LPD8806.cpp Fri Dec 16 10:26:35 2011 +0000 +++ b/LPD8806.cpp Sun Sep 16 13:09:54 2012 +0000 @@ -5,33 +5,40 @@ // and their strips: http://www.adafruit.com/products/306 // Released under the MIT License: http://mbed.org/license/mit // -// standard connected to 1st hardware SPI -// LPD8806 <> MBED -// DATA -> P5 -// CLOCK -> p7 +// Parameterized and modified to use soft SPI. +// Jas Strong <jasmine@electronpusher.org> /*****************************************************************************/ #include "LPD8806.h" -//Define SPI pins -//Connected to first SPI module -SPI spi(p5, p6, p7); // mosi, miso, sclk -//SPI spi(p11, p12, p13); // mosi, miso, sclk - -LPD8806::LPD8806(uint16_t n) { +LPD8806::LPD8806(PinName dataPin, PinName clockPin, int n) : + dat(dataPin), + clk(clockPin) { // Allocate 3 bytes per pixel: + numLEDs = n; if (NULL != (pixels = (uint8_t *)malloc(numLEDs * 3))) { memset(pixels, 0x80, numLEDs * 3); // Init to RGB 'off' state - numLEDs = n; } } -void LPD8806::begin(void) { +/* + * Soft SPI clock-out implementation (CPOL = 0, CPHA = 0). + * Certainly not the fastest in the world but it'll do. + * Gets about 3.6 MHz; could get several times as much + * using the bitbands directly - jas. + */ + +void LPD8806::write(uint8_t byte) { + for (int i=0; i<8; i++) { + clk = 0; + dat = (byte & 0x80); + clk = 1; + byte <<= 1; + } + clk = 0; +} - // 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); +void LPD8806::begin(void) { // Issue initial latch to 'wake up' strip (latch length varies w/numLEDs) writezeros(3 * ((numLEDs + 63) / 64)); @@ -42,7 +49,11 @@ } void LPD8806::writezeros(uint16_t n) { - while (n--) spi.write(0x00); + while (n--) write(0x00); +} + +void LPD8806::blank(void) { + memset(pixels, 0x80, numLEDs * 3); } // This is how data is pushed to the strip. Unfortunately, the company @@ -53,15 +64,11 @@ uint16_t i, nl3 = numLEDs * 3; // 3 bytes per LED for (i=0; i<nl3; i++ ) { - spi.write(pixels[i]); + 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 @@ -81,6 +88,31 @@ pixels[n*3+2] = b | 0x80; } +void LPD8806::setPixelGB(uint16_t n, uint8_t g, uint8_t b) { + if (n >= numLEDs) return; // '>=' because arrays are 0-indexed + + pixels[n*3 ] = g | 0x80; + pixels[n*3+2] = b | 0x80; +} + +void LPD8806::setPixelR(uint16_t n, uint8_t r) { + if (n >= numLEDs) return; // '>=' because arrays are 0-indexed + + pixels[n*3+1] = r | 0x80; +} + +void LPD8806::setPixelG(uint16_t n, uint8_t g) { + if (n >= numLEDs) return; // '>=' because arrays are 0-indexed + + pixels[n*3] = g | 0x80; +} + +void LPD8806::setPixelB(uint16_t n, uint8_t b) { + if (n >= numLEDs) return; // '>=' because arrays are 0-indexed + + pixels[n*3+2] = b | 0x80; +} + void LPD8806::setPixelColor(uint16_t n, uint32_t c) { if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
--- a/LPD8806.h Fri Dec 16 10:26:35 2011 +0000 +++ b/LPD8806.h Sun Sep 16 13:09:54 2012 +0000 @@ -19,11 +19,17 @@ public: - LPD8806(uint16_t n); + LPD8806(PinName dataPin, PinName clockPin, int n); void begin(void), show(void), + blank(void), setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b), + setPixelGB(uint16_t n, uint8_t g, uint8_t b), + setPixelB(uint16_t n, uint8_t b), + setPixelG(uint16_t n, uint8_t g), + setPixelR(uint16_t n, uint8_t r), + setPixelColor(uint16_t n, uint32_t c); uint16_t numPixels(void); @@ -31,7 +37,9 @@ Color(uint8_t, uint8_t, uint8_t); private: - + DigitalOut dat; + DigitalOut clk; + void write(uint8_t byte); uint8_t *pixels; // Holds LED color values uint16_t