328 lines
14 KiB
C
328 lines
14 KiB
C
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/*--------------------------------------------------------------------
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This file is part of the tinyNeoPixel library, derived from
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Adafruit_NeoPixel.
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NeoPixel is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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NeoPixel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with NeoPixel. If not, see
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<http://www.gnu.org/licenses/>.
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--------------------------------------------------------------------*/
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// *INDENT-OFF* astyle hates this file
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// *PAD-OFF* and destroys the lookup tables!
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#ifndef TINYNEOPIXEL_H
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#define TINYNEOPIXEL_H
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#include <Arduino.h>
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#if (__AVR_ARCH__ < 100)
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#error "This version of the library only supports AVRxt parts (tinyAVR 0/1/2-series, megaAVR 0-series and the AVR DA/DB/DD parts. For tinyNeoPixel, for classic AVR, get from ATTinyCore package"
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#endif
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// The order of primary colors in the NeoPixel data stream can vary
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// among device types, manufacturers and even different revisions of
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// the same item. The third parameter to the Adafruit_NeoPixel
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// constructor encodes the per-pixel byte offsets of the red, green
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// and blue primaries (plus white, if present) in the data stream --
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// the following #defines provide an easier-to-use named version for
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// each permutation. e.g. NEO_GRB indicates a NeoPixel-compatible
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// device expecting three bytes per pixel, with the first byte
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// containing the green value, second containing red and third
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// containing blue. The in-memory representation of a chain of
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// NeoPixels is the same as the data-stream order; no re-ordering of
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// bytes is required when issuing data to the chain.
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// Bits 5,4 of this value are the offset (0-3) from the first byte of
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// a pixel to the location of the red color byte. Bits 3,2 are the
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// green offset and 1,0 are the blue offset. If it is an RGBW-type
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// device (supporting a white primary in addition to R,G,B), bits 7,6
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// are the offset to the white byte...otherwise, bits 7,6 are set to
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// the same value as 5,4 (red) to indicate an RGB (not RGBW) device.
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// i.e. binary representation:
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// 0bWWRRGGBB for RGBW devices
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// 0bRRRRGGBB for RGB
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// RGB NeoPixel permutations; white and red offsets are always same
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// Offset: W R G B
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#define NEO_RGB ((0 << 6) | (0 << 4) | (1 << 2) | (2))
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#define NEO_RBG ((0 << 6) | (0 << 4) | (2 << 2) | (1))
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#define NEO_GRB ((1 << 6) | (1 << 4) | (0 << 2) | (2))
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#define NEO_GBR ((2 << 6) | (2 << 4) | (0 << 2) | (1))
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#define NEO_BRG ((1 << 6) | (1 << 4) | (2 << 2) | (0))
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#define NEO_BGR ((2 << 6) | (2 << 4) | (1 << 2) | (0))
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// RGBW NeoPixel permutations; all 4 offsets are distinct
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// Offset: W R G B
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#define NEO_WRGB ((0 << 6) | (1 << 4) | (2 << 2) | (3))
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#define NEO_WRBG ((0 << 6) | (1 << 4) | (3 << 2) | (2))
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#define NEO_WGRB ((0 << 6) | (2 << 4) | (1 << 2) | (3))
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#define NEO_WGBR ((0 << 6) | (3 << 4) | (1 << 2) | (2))
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#define NEO_WBRG ((0 << 6) | (2 << 4) | (3 << 2) | (1))
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#define NEO_WBGR ((0 << 6) | (3 << 4) | (2 << 2) | (1))
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#define NEO_RWGB ((1 << 6) | (0 << 4) | (2 << 2) | (3))
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#define NEO_RWBG ((1 << 6) | (0 << 4) | (3 << 2) | (2))
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#define NEO_RGWB ((2 << 6) | (0 << 4) | (1 << 2) | (3))
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#define NEO_RGBW ((3 << 6) | (0 << 4) | (1 << 2) | (2))
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#define NEO_RBWG ((2 << 6) | (0 << 4) | (3 << 2) | (1))
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#define NEO_RBGW ((3 << 6) | (0 << 4) | (2 << 2) | (1))
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#define NEO_GWRB ((1 << 6) | (2 << 4) | (0 << 2) | (3))
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#define NEO_GWBR ((1 << 6) | (3 << 4) | (0 << 2) | (2))
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#define NEO_GRWB ((2 << 6) | (1 << 4) | (0 << 2) | (3))
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#define NEO_GRBW ((3 << 6) | (1 << 4) | (0 << 2) | (2))
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#define NEO_GBWR ((2 << 6) | (3 << 4) | (0 << 2) | (1))
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#define NEO_GBRW ((3 << 6) | (2 << 4) | (0 << 2) | (1))
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#define NEO_BWRG ((1 << 6) | (2 << 4) | (3 << 2) | (0))
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#define NEO_BWGR ((1 << 6) | (3 << 4) | (2 << 2) | (0))
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#define NEO_BRWG ((2 << 6) | (1 << 4) | (3 << 2) | (0))
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#define NEO_BRGW ((3 << 6) | (1 << 4) | (2 << 2) | (0))
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#define NEO_BGWR ((2 << 6) | (3 << 4) | (1 << 2) | (0))
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#define NEO_BGRW ((3 << 6) | (2 << 4) | (1 << 2) | (0))
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#define NEO_KHZ800 0x0000 ///< 800 KHz data transmission
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// 400 kHz neopixels are virtually absent from the market today
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// They are not supported.
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// These two tables are declared outside the Adafruit_NeoPixel class
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// because some boards may require oldschool compilers that don't
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// handle the C++11 constexpr keyword.
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/* A pre-calculated 8-bit sine look-up table stored in flash for use
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with the sine8() function. This is apparently of use in some animation
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algorithms. If __AVR_ARCH__==103, then all of the flash is memory
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mapped, and we can simply declare it const, access it like a
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normal variable, and it won't be copied to RAM.
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AVRxt devices with too much flash for all of it to be mapped
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which includes the AVR64Dx and AVR128Dx parts. DxCore defines a
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.section for the area of PROGMEM that is mapped by default, and
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a MAPPED_PROGMEM macro. A variable declared const MAPPED_PROGMEM can
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be accessed normally, but will be stored in the flash and not copied to RAM.
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Finally, if neither of those are an option - it gets declared with PROGMEM
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Copy & paste this snippet into a Python REPL to regenerate:
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import math
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for x in range(256):
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print("{:3},".format(int((math.sin(x/128.0*math.pi)+1.0)*127.5+0.5))),
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if x&15 == 15: print
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*/
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#if (__AVR_ARCH__==103)
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// All out flash is mapped - yay!
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static const uint8_t _NeoPixelSineTable[256] = {
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#elif defined(MAPPED_PROGMEM)
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// Some of it is - but we can put stuff there - yay!
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static const uint8_t MAPPED_PROGMEM _NeoPixelSineTable[256] = {
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#else
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// Back to progmem...
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static const uint8_t PROGMEM _NeoPixelSineTable[256] = {
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#endif
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128,131,134,137,140,143,146,149,152,155,158,162,165,167,170,173,
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176,179,182,185,188,190,193,196,198,201,203,206,208,211,213,215,
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218,220,222,224,226,228,230,232,234,235,237,238,240,241,243,244,
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245,246,248,249,250,250,251,252,253,253,254,254,254,255,255,255,
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255,255,255,255,254,254,254,253,253,252,251,250,250,249,248,246,
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245,244,243,241,240,238,237,235,234,232,230,228,226,224,222,220,
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218,215,213,211,208,206,203,201,198,196,193,190,188,185,182,179,
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176,173,170,167,165,162,158,155,152,149,146,143,140,137,134,131,
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128,124,121,118,115,112,109,106,103,100, 97, 93, 90, 88, 85, 82,
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79, 76, 73, 70, 67, 65, 62, 59, 57, 54, 52, 49, 47, 44, 42, 40,
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37, 35, 33, 31, 29, 27, 25, 23, 21, 20, 18, 17, 15, 14, 12, 11,
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10, 9, 7, 6, 5, 5, 4, 3, 2, 2, 1, 1, 1, 0, 0, 0,
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0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 9,
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10, 11, 12, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35,
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37, 40, 42, 44, 47, 49, 52, 54, 57, 59, 62, 65, 67, 70, 73, 76,
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79, 82, 85, 88, 90, 93, 97,100,103,106,109,112,115,118,121,124};
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/* Similar to above, but for an 8-bit gamma-correction table.
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Copy & paste this snippet into a Python REPL to regenerate:
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import math
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gamma=2.6
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for x in range(256):
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print("{:3},".format(int(math.pow((x)/255.0,gamma)*255.0+0.5))),
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if x&15 == 15: print
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*/
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#if (__AVR_ARCH__==103)
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// All our flash is mapped - yay!
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static const uint8_t _NeoPixelGammaTable[256] = {
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#elif defined(MAPPED_PROGMEM)
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// Some of it is - but we can put stuff there - yay!
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static const uint8_t MAPPED_PROGMEM _NeoPixelGammaTable[256] = {
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#else
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// Back to progmem...
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static const uint8_t PROGMEM _NeoPixelGammaTable[256] = {
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#endif
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3,
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3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7,
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7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12,
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13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20,
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20, 21, 21, 22, 22, 23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29,
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30, 31, 31, 32, 33, 34, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42,
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42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
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58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 73, 75,
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76, 77, 78, 80, 81, 82, 84, 85, 86, 88, 89, 90, 92, 93, 94, 96,
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97, 99,100,102,103,105,106,108,109,111,112,114,115,117,119,120,
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122,124,125,127,129,130,132,134,136,137,139,141,143,145,146,148,
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150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,
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182,184,186,188,191,193,195,197,199,202,204,206,209,211,213,215,
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218,220,223,225,227,230,232,235,237,240,242,245,247,250,252,255};
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typedef uint8_t neoPixelType;
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class tinyNeoPixel {
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public:
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// Constructor: number of LEDs, pin number, LED type
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tinyNeoPixel(uint16_t n, uint8_t p, neoPixelType t, uint8_t *pxl);
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~tinyNeoPixel();
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void
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show(void),
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setPin(uint8_t p),
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setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b),
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setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w),
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setPixelColor(uint16_t n, uint32_t c),
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fill(uint32_t c=0, uint16_t first=0, uint16_t count=0),
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setBrightness(uint8_t b),
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clear();
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uint8_t
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*getPixels(void) const,
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getBrightness(void) const;
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uint16_t
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numPixels(void) const;
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uint32_t
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getPixelColor(uint16_t n) const;
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uint8_t getPin(void) { return pin; }
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void begin(void) {return;}
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/*!
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@brief An 8-bit integer sine wave function, not directly compatible
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with standard trigonometric units like radians or degrees.
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@param x Input angle, 0-255; 256 would loop back to zero, completing
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the circle (equivalent to 360 degrees or 2 pi radians).
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One can therefore use an unsigned 8-bit variable and simply
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add or subtract, allowing it to overflow/underflow and it
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still does the expected contiguous thing.
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@return Sine result, 0 to 255, or -128 to +127 if type-converted to
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a signed int8_t, but you'll most likely want unsigned as this
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output is often used for pixel brightness in animation effects.
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*/
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static uint8_t sine8(uint8_t x) { // 0-255 in, 0-255 out
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#if (__AVR_ARCH__==103 || defined(MAPPED_PROGMEM))
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return _NeoPixelSineTable[x];
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#else // We had to put it in PROGMEM, and that's how we get it out
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return pgm_read_byte(&_NeoPixelSineTable[x]); // 0-255 in, 0-255 out
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#endif
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}
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/*!
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@brief An 8-bit gamma-correction function for basic pixel brightness
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adjustment. Makes color transitions appear more perceptially
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correct.
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@param x Input brightness, 0 (minimum or off/black) to 255 (maximum).
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@return Gamma-adjusted brightness, can then be passed to one of the
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setPixelColor() functions. This uses a fixed gamma correction
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exponent of 2.6, which seems reasonably okay for average
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NeoPixels in average tasks. If you need finer control you'll
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need to provide your own gamma-correction function instead.
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*/
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static uint8_t gamma8(uint8_t x) {
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#if (__AVR_ARCH__==103 || defined(MAPPED_PROGMEM))
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return _NeoPixelGammaTable[x];
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#else
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return pgm_read_byte(&_NeoPixelGammaTable[x]);
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#endif
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}
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/*!
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@brief Convert separate red, green and blue values into a single
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"packed" 32-bit RGB color.
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@param r Red brightness, 0 to 255.
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@param g Green brightness, 0 to 255.
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@param b Blue brightness, 0 to 255.
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@return 32-bit packed RGB value, which can then be assigned to a
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variable for later use or passed to the setPixelColor()
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function. Packed RGB format is predictable, regardless of
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LED strand color order.
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*/
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static uint32_t Color(uint8_t r, uint8_t g, uint8_t b) {
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return ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
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}
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/*!
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@brief Convert separate red, green, blue and white values into a
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single "packed" 32-bit WRGB color.
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@param r Red brightness, 0 to 255.
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@param g Green brightness, 0 to 255.
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@param b Blue brightness, 0 to 255.
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@param w White brightness, 0 to 255.
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@return 32-bit packed WRGB value, which can then be assigned to a
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variable for later use or passed to the setPixelColor()
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function. Packed WRGB format is predictable, regardless of
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LED strand color order.
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*/
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static uint32_t Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
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return ((uint32_t)w << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
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}
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static uint32_t ColorHSV(uint16_t hue, uint8_t sat=255, uint8_t val=255);
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/*!
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@brief A gamma-correction function for 32-bit packed RGB or WRGB
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colors. Makes color transitions appear more perceptially
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correct.
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@param x 32-bit packed RGB or WRGB color.
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@return Gamma-adjusted packed color, can then be passed in one of the
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setPixelColor() functions. Like gamma8(), this uses a fixed
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gamma correction exponent of 2.6, which seems reasonably okay
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for average NeoPixels in average tasks. If you need finer
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control you'll need to provide your own gamma-correction
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function instead.
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*/
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static uint32_t gamma32(uint32_t x);
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#if (!defined(DISABLEMILLIS) && !defined(MILLIS_USE_TIMERRTC) && !defined(MILLIS_USE_TIMERRTC_XTAL) && !defined(MILLIS_USE_TIMERRTC_XOSC))
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inline bool canShow(void) { return (micros() - endTime) >= 50L; }
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#else
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inline bool canShow(void) {return 1;} //we don't have micros here;
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#endif
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private:
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uint16_t
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numLEDs, // Number of RGB LEDs in strip
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numBytes; // Size of 'pixels' buffer below (3 or 4 bytes/pixel)
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int8_t
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pin; // Output pin number (-1 if not yet set)
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uint8_t
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brightness,
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*pixels, // Holds LED color values (3 or 4 bytes each)
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rOffset, // Index of red byte within each 3- or 4-byte pixel
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gOffset, // Index of green byte
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bOffset, // Index of blue byte
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wOffset; // Index of white byte (same as rOffset if no white)
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uint32_t
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endTime; // Latch timing reference
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volatile uint8_t
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*port; // Output PORT register
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uint8_t
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pinMask; // Output PORT bitmask
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};
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#endif // TINYNEOPIXEL_H
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