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Dependencies:   Multi_WS2811 mbed MMA8451Q

Fork of WS2811 by Heroic Robotics

LedStrip.cpp@29:a76075c853ee, 2014-01-03 (annotated)

Committer:
bikeNomad
Date:
Fri Jan 03 19:17:24 2014 +0000
Revision:
29:a76075c853ee
Parent:
17:b4e9d8f4baa9 
fixed bit timing to eliminate flickering.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bikeNomad 17:b4e9d8f4baa9 1 #include "LedStrip.h"
bikeNomad 17:b4e9d8f4baa9 2
bikeNomad 17:b4e9d8f4baa9 3 LedStrip::LedStrip(int n)
bikeNomad 17:b4e9d8f4baa9 4 {
bikeNomad 17:b4e9d8f4baa9 5 // Allocate 3 bytes per pixel:
bikeNomad 17:b4e9d8f4baa9 6 numLEDs = n;
bikeNomad 17:b4e9d8f4baa9 7 pixels = (uint8_t *)malloc(numPixelBytes());
bikeNomad 17:b4e9d8f4baa9 8 if (pixels) {
bikeNomad 17:b4e9d8f4baa9 9 memset(pixels, 0x00, numPixelBytes()); // Init to RGB 'off' state
bikeNomad 17:b4e9d8f4baa9 10 }
bikeNomad 17:b4e9d8f4baa9 11 }
bikeNomad 17:b4e9d8f4baa9 12
bikeNomad 17:b4e9d8f4baa9 13 LedStrip::~LedStrip()
bikeNomad 17:b4e9d8f4baa9 14 {
bikeNomad 17:b4e9d8f4baa9 15 free(pixels);
bikeNomad 17:b4e9d8f4baa9 16 }
bikeNomad 17:b4e9d8f4baa9 17
bikeNomad 17:b4e9d8f4baa9 18 uint32_t LedStrip::total_luminance(void)
bikeNomad 17:b4e9d8f4baa9 19 {
bikeNomad 17:b4e9d8f4baa9 20 uint32_t running_total;
bikeNomad 17:b4e9d8f4baa9 21 running_total = 0;
bikeNomad 17:b4e9d8f4baa9 22 for (int i=0; i< numPixelBytes(); i++)
bikeNomad 17:b4e9d8f4baa9 23 running_total += pixels[i];
bikeNomad 17:b4e9d8f4baa9 24 return running_total;
bikeNomad 17:b4e9d8f4baa9 25 }
bikeNomad 17:b4e9d8f4baa9 26
bikeNomad 17:b4e9d8f4baa9 27 // Convert R,G,B to combined 32-bit color
bikeNomad 17:b4e9d8f4baa9 28 uint32_t LedStrip::Color(uint8_t r, uint8_t g, uint8_t b)
bikeNomad 17:b4e9d8f4baa9 29 {
bikeNomad 17:b4e9d8f4baa9 30 // Take the lowest 7 bits of each value and append them end to end
bikeNomad 17:b4e9d8f4baa9 31 // We have the top bit set high (its a 'parity-like' bit in the protocol
bikeNomad 17:b4e9d8f4baa9 32 // and must be set!)
bikeNomad 17:b4e9d8f4baa9 33 return ((uint32_t)g << 16) | ((uint32_t)r << 8) | (uint32_t)b;
bikeNomad 17:b4e9d8f4baa9 34 }
bikeNomad 17:b4e9d8f4baa9 35
bikeNomad 17:b4e9d8f4baa9 36 // store the rgb component in our array
bikeNomad 17:b4e9d8f4baa9 37 void LedStrip::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b)
bikeNomad 17:b4e9d8f4baa9 38 {
bikeNomad 17:b4e9d8f4baa9 39 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
bikeNomad 17:b4e9d8f4baa9 40
bikeNomad 17:b4e9d8f4baa9 41 pixels[n*3 ] = g;
bikeNomad 17:b4e9d8f4baa9 42 pixels[n*3+1] = r;
bikeNomad 17:b4e9d8f4baa9 43 pixels[n*3+2] = b;
bikeNomad 17:b4e9d8f4baa9 44 }
bikeNomad 17:b4e9d8f4baa9 45
bikeNomad 17:b4e9d8f4baa9 46 void LedStrip::setPixelR(uint16_t n, uint8_t r)
bikeNomad 17:b4e9d8f4baa9 47 {
bikeNomad 17:b4e9d8f4baa9 48 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
bikeNomad 17:b4e9d8f4baa9 49
bikeNomad 17:b4e9d8f4baa9 50 pixels[n*3+1] = r;
bikeNomad 17:b4e9d8f4baa9 51 }
bikeNomad 17:b4e9d8f4baa9 52
bikeNomad 17:b4e9d8f4baa9 53 void LedStrip::setPixelG(uint16_t n, uint8_t g)
bikeNomad 17:b4e9d8f4baa9 54 {
bikeNomad 17:b4e9d8f4baa9 55 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
bikeNomad 17:b4e9d8f4baa9 56
bikeNomad 17:b4e9d8f4baa9 57 pixels[n*3] = g;
bikeNomad 17:b4e9d8f4baa9 58 }
bikeNomad 17:b4e9d8f4baa9 59
bikeNomad 17:b4e9d8f4baa9 60 void LedStrip::setPixelB(uint16_t n, uint8_t b)
bikeNomad 17:b4e9d8f4baa9 61 {
bikeNomad 17:b4e9d8f4baa9 62 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
bikeNomad 17:b4e9d8f4baa9 63
bikeNomad 17:b4e9d8f4baa9 64 pixels[n*3+2] = b;
bikeNomad 17:b4e9d8f4baa9 65 }
bikeNomad 17:b4e9d8f4baa9 66
bikeNomad 17:b4e9d8f4baa9 67 void LedStrip::setPackedPixels(uint8_t * buffer, uint32_t n)
bikeNomad 17:b4e9d8f4baa9 68 {
bikeNomad 17:b4e9d8f4baa9 69 if (n >= numLEDs) return;
bikeNomad 17:b4e9d8f4baa9 70 memcpy(pixels, buffer, (size_t) (n*3));
bikeNomad 17:b4e9d8f4baa9 71 }
bikeNomad 17:b4e9d8f4baa9 72
bikeNomad 17:b4e9d8f4baa9 73 void LedStrip::setPixelColor(uint16_t n, uint32_t c)
bikeNomad 17:b4e9d8f4baa9 74 {
bikeNomad 17:b4e9d8f4baa9 75 if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
bikeNomad 17:b4e9d8f4baa9 76
bikeNomad 17:b4e9d8f4baa9 77 pixels[n*3 ] = (c >> 16);
bikeNomad 17:b4e9d8f4baa9 78 pixels[n*3+1] = (c >> 8);
bikeNomad 17:b4e9d8f4baa9 79 pixels[n*3+2] = c;
bikeNomad 17:b4e9d8f4baa9 80 }