LedStrip.cpp

00001 #include "LedStrip.h"
00002 
00003 LedStrip::LedStrip(int n)
00004 {
00005    // Allocate 3 bytes per pixel:
00006     numLEDs = n;
00007     pixels = (uint8_t *)malloc(numPixelBytes());
00008     if (pixels) {
00009         memset(pixels, 0x00, numPixelBytes()); // Init to RGB 'off' state
00010     }
00011 }
00012 
00013 LedStrip::~LedStrip()
00014 {
00015     free(pixels);
00016 }
00017  
00018 uint32_t LedStrip::total_luminance(void)
00019 {
00020     uint32_t running_total;
00021     running_total = 0;
00022     for (int i=0; i< numPixelBytes(); i++)
00023         running_total += pixels[i];
00024     return running_total;
00025 }
00026 
00027 // Convert R,G,B to combined 32-bit color
00028 uint32_t LedStrip::Color(uint8_t r, uint8_t g, uint8_t b)
00029 {
00030     // Take the lowest 7 bits of each value and append them end to end
00031     // We have the top bit set high (its a 'parity-like' bit in the protocol
00032     // and must be set!)
00033     return ((uint32_t)g << 16) | ((uint32_t)r << 8) | (uint32_t)b;
00034 }
00035 
00036 // store the rgb component in our array
00037 void LedStrip::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b)
00038 {
00039     if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
00040 
00041     pixels[n*3  ] = g;
00042     pixels[n*3+1] = r;
00043     pixels[n*3+2] = b;
00044 }
00045 
00046 void LedStrip::setPixelR(uint16_t n, uint8_t r)
00047 {
00048     if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
00049 
00050     pixels[n*3+1] = r;
00051 }
00052 
00053 void LedStrip::setPixelG(uint16_t n, uint8_t g)
00054 {
00055     if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
00056 
00057     pixels[n*3] = g;
00058 }
00059 
00060 void LedStrip::setPixelB(uint16_t n, uint8_t b)
00061 {
00062     if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
00063 
00064     pixels[n*3+2] = b;
00065 }
00066 
00067 void LedStrip::setPackedPixels(uint8_t * buffer, uint32_t n)
00068 {
00069     if (n >= numLEDs) return;
00070     memcpy(pixels, buffer, (size_t) (n*3));
00071 }
00072 
00073 void LedStrip::setPixelColor(uint16_t n, uint32_t c)
00074 {
00075     if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
00076 
00077     pixels[n*3  ] = (c >> 16);
00078     pixels[n*3+1] = (c >>  8);
00079     pixels[n*3+2] =  c;
00080 }