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

WS2811.cpp@13:1f65330abe92, 2013-07-23 (annotated)

Committer:
heroic
Date:
Tue Jul 23 22:32:14 2013 +0000
Revision:
13:1f65330abe92
Parent:
12:7ebd51549c04
Child:
14:c97261a9a282
Rework timing for constant execution time;  do direct bitband writes for improved speed;  change interrupt handling (turns out we can't have interrupts during an entire strip push, not just between bits).; ; Now works!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
heroic 10:62368b801d16 1 // 800 KHz WS2811 driver, kinda.
heroic 8:e3249c2b7607 2 //
heroic 8:e3249c2b7607 3 // Parameterized and modified to use soft SPI.
heroic 8:e3249c2b7607 4 // Jas Strong <jasmine@electronpusher.org>
heroic 8:e3249c2b7607 5 /*****************************************************************************/
heroic 8:e3249c2b7607 6
heroic 8:e3249c2b7607 7 #include "LedStrip.h"
heroic 8:e3249c2b7607 8 #include "WS2811.h"
heroic 8:e3249c2b7607 9
heroic 10:62368b801d16 10 extern int onewire_speed_multiplier; // speed setting for ws2811 et al.
heroic 10:62368b801d16 11
heroic 10:62368b801d16 12
heroic 8:e3249c2b7607 13 WS2811::WS2811(PinName dataPin, PinName clockPin, int n) :
heroic 8:e3249c2b7607 14 dat(dataPin),
heroic 8:e3249c2b7607 15 clk(clockPin) {
heroic 8:e3249c2b7607 16 // Allocate 3 bytes per pixel:
heroic 8:e3249c2b7607 17 numLEDs = n;
heroic 8:e3249c2b7607 18 if ((pixels = (uint8_t *)malloc(numLEDs * 3))) {
heroic 8:e3249c2b7607 19 memset(pixels, 0x00, numLEDs * 3); // Init to RGB 'off' state
heroic 8:e3249c2b7607 20 }
heroic 8:e3249c2b7607 21 // calibrate delay loops for NRZ
heroic 8:e3249c2b7607 22 int i;
heroic 8:e3249c2b7607 23 guardtime.start();
heroic 8:e3249c2b7607 24 for (i=0; i<1000; i++)
heroic 8:e3249c2b7607 25 /* do nothing */;
heroic 8:e3249c2b7607 26 i=guardtime.read_us();
heroic 8:e3249c2b7607 27 printf("ws2811: 1000 iters took %d usec.\n", i);
heroic 11:d127f93be182 28 bogocal = (1000 / (onewire_speed_multiplier * i * 4.2)); // iterations per bitcell (417 nsec)
heroic 8:e3249c2b7607 29 printf("ws2811: calibrating to %d bogojiffies.\n", bogocal);
heroic 13:1f65330abe92 30
heroic 13:1f65330abe92 31 data_mask = dat.get_mask();
heroic 13:1f65330abe92 32 clock_mask = clk.get_mask();
heroic 13:1f65330abe92 33 data_set = dat.get_set();
heroic 13:1f65330abe92 34 data_clr = dat.get_clr();
heroic 13:1f65330abe92 35 clock_set = clk.get_set();
heroic 13:1f65330abe92 36 clock_clr = clk.get_clr();
heroic 13:1f65330abe92 37
heroic 8:e3249c2b7607 38 }
heroic 8:e3249c2b7607 39
heroic 8:e3249c2b7607 40 /*
heroic 8:e3249c2b7607 41 * These chips use a one-wire protocol based on a sort of NRZ signalling- jas.
heroic 8:e3249c2b7607 42 */
heroic 8:e3249c2b7607 43
heroic 8:e3249c2b7607 44 void WS2811::write(uint8_t byte) {
heroic 13:1f65330abe92 45
heroic 8:e3249c2b7607 46 for (int i=0; i<8; i++) {
heroic 8:e3249c2b7607 47 if (byte & 0x80)
heroic 8:e3249c2b7607 48 writebit(1);
heroic 8:e3249c2b7607 49 else
heroic 8:e3249c2b7607 50 writebit(0);
heroic 8:e3249c2b7607 51 byte <<= 1;
heroic 8:e3249c2b7607 52 }
heroic 8:e3249c2b7607 53 }
heroic 8:e3249c2b7607 54
heroic 8:e3249c2b7607 55 inline void WS2811::celldelay(void) {
heroic 13:1f65330abe92 56 for (volatile int i = 0; i<bogocal; i++)
heroic 8:e3249c2b7607 57 /* do nothing */ ;
heroic 8:e3249c2b7607 58 }
heroic 8:e3249c2b7607 59
heroic 13:1f65330abe92 60 inline void WS2811::writebit(bool bit) {
heroic 8:e3249c2b7607 61 // first cell is always 1
heroic 13:1f65330abe92 62 (*data_set) = data_mask;
heroic 8:e3249c2b7607 63 celldelay();
heroic 8:e3249c2b7607 64 if (bit) {
heroic 13:1f65330abe92 65 (*clock_set) = data_mask; // dummy, we don't care but must take constant time
heroic 8:e3249c2b7607 66 celldelay();
heroic 8:e3249c2b7607 67 } else {
heroic 13:1f65330abe92 68 (*data_clr) = data_mask;
heroic 8:e3249c2b7607 69 celldelay();
heroic 8:e3249c2b7607 70 }
heroic 8:e3249c2b7607 71 // last cell is always 0
heroic 13:1f65330abe92 72 (*data_clr) = data_mask;
heroic 8:e3249c2b7607 73 celldelay();
heroic 8:e3249c2b7607 74 }
heroic 8:e3249c2b7607 75
heroic 8:e3249c2b7607 76 void WS2811::begin(void) {
heroic 8:e3249c2b7607 77 blank();
heroic 8:e3249c2b7607 78 show();
heroic 8:e3249c2b7607 79 }
heroic 8:e3249c2b7607 80
heroic 8:e3249c2b7607 81 uint16_t WS2811::numPixels(void) {
heroic 8:e3249c2b7607 82 return numLEDs;
heroic 8:e3249c2b7607 83 }
heroic 8:e3249c2b7607 84
heroic 8:e3249c2b7607 85 void WS2811::blank(void) {
heroic 8:e3249c2b7607 86 memset(pixels, 0x00, numLEDs * 3);
heroic 8:e3249c2b7607 87 }
heroic 8:e3249c2b7607 88
heroic 8:e3249c2b7607 89 void WS2811::show(void) {
heroic 8:e3249c2b7607 90 uint16_t i, nl3 = numLEDs * 3; // 3 bytes per LED
heroic 8:e3249c2b7607 91 while (guardtime.read_us() < 50)
heroic 8:e3249c2b7607 92 /* spin */;
heroic 13:1f65330abe92 93 __disable_irq();
heroic 8:e3249c2b7607 94 for (i=0; i<nl3; i++ ) {
heroic 8:e3249c2b7607 95 write(pixels[i]);
heroic 8:e3249c2b7607 96 }
heroic 13:1f65330abe92 97 __enable_irq();
heroic 8:e3249c2b7607 98 guardtime.reset();
heroic 8:e3249c2b7607 99 }
heroic 8:e3249c2b7607 100
heroic 8:e3249c2b7607 101
heroic 8:e3249c2b7607 102 uint32_t WS2811::total_luminance(void) {
heroic 8:e3249c2b7607 103 uint32_t running_total;
heroic 8:e3249c2b7607 104 running_total = 0;
heroic 8:e3249c2b7607 105 for (int i=0; i<numLEDs*3; i++)
heroic 8:e3249c2b7607 106 running_total += pixels[i];
heroic 8:e3249c2b7607 107 return running_total;
heroic 8:e3249c2b7607 108 }
heroic 8:e3249c2b7607 109
heroic 8:e3249c2b7607 110 // Convert R,G,B to combined 32-bit color
heroic 8:e3249c2b7607 111 uint32_t WS2811::Color(uint8_t r, uint8_t g, uint8_t b) {
heroic 8:e3249c2b7607 112 // Take the lowest 7 bits of each value and append them end to end
heroic 8:e3249c2b7607 113 // We have the top bit set high (its a 'parity-like' bit in the protocol
heroic 8:e3249c2b7607 114 // and must be set!)
heroic 8:e3249c2b7607 115 return ((uint32_t)g << 16) | ((uint32_t)r << 8) | (uint32_t)b;
heroic 8:e3249c2b7607 116 }
heroic 8:e3249c2b7607 117
heroic 8:e3249c2b7607 118 // store the rgb component in our array
heroic 8:e3249c2b7607 119 void WS2811::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b) {
heroic 8:e3249c2b7607 120 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
heroic 8:e3249c2b7607 121
heroic 8:e3249c2b7607 122 pixels[n*3 ] = g;
heroic 8:e3249c2b7607 123 pixels[n*3+1] = r;
heroic 8:e3249c2b7607 124 pixels[n*3+2] = b;
heroic 8:e3249c2b7607 125 }
heroic 8:e3249c2b7607 126
heroic 8:e3249c2b7607 127 void WS2811::setPixelR(uint16_t n, uint8_t r) {
heroic 8:e3249c2b7607 128 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
heroic 8:e3249c2b7607 129
heroic 8:e3249c2b7607 130 pixels[n*3+1] = r;
heroic 8:e3249c2b7607 131 }
heroic 8:e3249c2b7607 132
heroic 8:e3249c2b7607 133 void WS2811::setPixelG(uint16_t n, uint8_t g) {
heroic 8:e3249c2b7607 134 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
heroic 8:e3249c2b7607 135
heroic 8:e3249c2b7607 136 pixels[n*3] = g;
heroic 8:e3249c2b7607 137 }
heroic 8:e3249c2b7607 138
heroic 8:e3249c2b7607 139 void WS2811::setPixelB(uint16_t n, uint8_t b) {
heroic 8:e3249c2b7607 140 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
heroic 8:e3249c2b7607 141
heroic 8:e3249c2b7607 142 pixels[n*3+2] = b;
heroic 8:e3249c2b7607 143 }
heroic 8:e3249c2b7607 144
heroic 12:7ebd51549c04 145 void WS2811::setPackedPixels(uint8_t * buffer, uint32_t n) {
heroic 12:7ebd51549c04 146 if (n >= numLEDs) return;
heroic 12:7ebd51549c04 147 memcpy(pixels, buffer, (size_t) (n*3));
heroic 12:7ebd51549c04 148 }
heroic 12:7ebd51549c04 149
heroic 8:e3249c2b7607 150 void WS2811::setPixelColor(uint16_t n, uint32_t c) {
heroic 8:e3249c2b7607 151 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
heroic 8:e3249c2b7607 152
heroic 8:e3249c2b7607 153 pixels[n*3 ] = (c >> 16);
heroic 8:e3249c2b7607 154 pixels[n*3+1] = (c >> 8);
heroic 8:e3249c2b7607 155 pixels[n*3+2] = c;
heroic 8:e3249c2b7607 156 }