diff --git a/Adafruit_NeoPixel.cpp b/Adafruit_NeoPixel.cpp index ba1b3def..8490d0f4 100644 --- a/Adafruit_NeoPixel.cpp +++ b/Adafruit_NeoPixel.cpp @@ -2177,22 +2177,56 @@ void Adafruit_NeoPixel::clear() { memset(pixels, 0, numBytes); } -// This bizarre construct isn't Arduino code in the conventional sense. -// It exploits features of GCC's preprocessor to generate a PROGMEM -// table (in flash memory) holding an 8-bit unsigned sine wave (0-255). -static const int _SBASE_ = __COUNTER__ + 1; // Index of 1st __COUNTER__ below -#define _S1_ (uint8_t)((sin((__COUNTER__-_SBASE_)/128.0*M_PI)+1.0)*127.5+0.5), -#define _S2_ _S1_ _S1_ _S1_ _S1_ _S1_ _S1_ _S1_ _S1_ // Expands to 8 items -#define _S3_ _S2_ _S2_ _S2_ _S2_ _S2_ _S2_ _S2_ _S2_ // Expands to 64 items -static const uint8_t PROGMEM _sineTable[] = { _S3_ _S3_ _S3_ _S3_ }; // 256 - -// Similar to above, but for an 8-bit gamma-correction table. -#define _GAMMA_ 2.6 -static const int _GBASE_ = __COUNTER__ + 1; // Index of 1st __COUNTER__ below -#define _G1_ (uint8_t)(pow((__COUNTER__-_GBASE_)/255.0,_GAMMA_)*255.0+0.5), -#define _G2_ _G1_ _G1_ _G1_ _G1_ _G1_ _G1_ _G1_ _G1_ // Expands to 8 items -#define _G3_ _G2_ _G2_ _G2_ _G2_ _G2_ _G2_ _G2_ _G2_ // Expands to 64 items -static const uint8_t PROGMEM _gammaTable[] = { _G3_ _G3_ _G3_ _G3_ }; // 256 +/* A PROGMEM (flash mem) table containing 8-bit unsigned sine wave (0-255). + Copy & paste this snippet into a Python REPL to regenerate: +import math +for x in range(256): + print("{:3},".format(int((math.sin(x/128.0*math.pi)+1.0)*127.5+0.5))), + if x&15 == 15: print +*/ +static const uint8_t PROGMEM _sineTable[256] = { + 128,131,134,137,140,143,146,149,152,155,158,162,165,167,170,173, + 176,179,182,185,188,190,193,196,198,201,203,206,208,211,213,215, + 218,220,222,224,226,228,230,232,234,235,237,238,240,241,243,244, + 245,246,248,249,250,250,251,252,253,253,254,254,254,255,255,255, + 255,255,255,255,254,254,254,253,253,252,251,250,250,249,248,246, + 245,244,243,241,240,238,237,235,234,232,230,228,226,224,222,220, + 218,215,213,211,208,206,203,201,198,196,193,190,188,185,182,179, + 176,173,170,167,165,162,158,155,152,149,146,143,140,137,134,131, + 128,124,121,118,115,112,109,106,103,100, 97, 93, 90, 88, 85, 82, + 79, 76, 73, 70, 67, 65, 62, 59, 57, 54, 52, 49, 47, 44, 42, 40, + 37, 35, 33, 31, 29, 27, 25, 23, 21, 20, 18, 17, 15, 14, 12, 11, + 10, 9, 7, 6, 5, 5, 4, 3, 2, 2, 1, 1, 1, 0, 0, 0, + 0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 9, + 10, 11, 12, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35, + 37, 40, 42, 44, 47, 49, 52, 54, 57, 59, 62, 65, 67, 70, 73, 76, + 79, 82, 85, 88, 90, 93, 97,100,103,106,109,112,115,118,121,124}; + +/* Similar to above, but for an 8-bit gamma-correction table. + Copy & paste this snippet into a Python REPL to regenerate: +import math +gamma=2.6 +for x in range(256): + print("{:3},".format(int(math.pow((x)/255.0,gamma)*255.0+0.5))), + if x&15 == 15: print +*/ +static const uint8_t PROGMEM _gammaTable[256] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, + 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7, + 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, + 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, + 20, 21, 21, 22, 22, 23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29, + 30, 31, 31, 32, 33, 34, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42, + 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, + 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 73, 75, + 76, 77, 78, 80, 81, 82, 84, 85, 86, 88, 89, 90, 92, 93, 94, 96, + 97, 99,100,102,103,105,106,108,109,111,112,114,115,117,119,120, + 122,124,125,127,129,130,132,134,136,137,139,141,143,145,146,148, + 150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180, + 182,184,186,188,191,193,195,197,199,202,204,206,209,211,213,215, + 218,220,223,225,227,230,232,235,237,240,242,245,247,250,252,255}; uint8_t Adafruit_NeoPixel::sine8(uint8_t x) const { return pgm_read_byte(&_sineTable[x]); // 0-255 in, 0-255 out diff --git a/library.properties b/library.properties index 0c7362d4..c09be615 100644 --- a/library.properties +++ b/library.properties @@ -1,5 +1,5 @@ name=Adafruit NeoPixel -version=1.1.5 +version=1.1.6 author=Adafruit maintainer=Adafruit sentence=Arduino library for controlling single-wire-based LED pixels and strip.