367 lines
18 KiB
C
367 lines
18 KiB
C
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/*!
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* @file Adafruit_NeoPixel.h
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*
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* This is part of Adafruit's NeoPixel library for the Arduino platform,
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* allowing a broad range of microcontroller boards (most AVR boards,
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* many ARM devices, ESP8266 and ESP32, among others) to control Adafruit
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* NeoPixels, FLORA RGB Smart Pixels and compatible devices -- WS2811,
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* WS2812, WS2812B, SK6812, etc.
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*
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* Adafruit invests time and resources providing this open source code,
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* please support Adafruit and open-source hardware by purchasing products
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* from Adafruit!
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*
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* Written by Phil "Paint Your Dragon" Burgess for Adafruit Industries,
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* with contributions by PJRC, Michael Miller and other members of the
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* open source community.
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*
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* This file is part of the Adafruit_NeoPixel library.
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*
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* Adafruit_NeoPixel is free software: you can redistribute it and/or
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* modify 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 the
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* License, or (at your option) any later version.
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*
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* Adafruit_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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*
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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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*/
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#ifndef ADAFRUIT_NEOPIXEL_H
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#define ADAFRUIT_NEOPIXEL_H
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#ifdef ARDUINO
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#if (ARDUINO >= 100)
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#include <Arduino.h>
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#else
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#include <WProgram.h>
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#include <pins_arduino.h>
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#endif
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#endif
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#ifdef TARGET_LPC1768
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#include <Arduino.h>
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#endif
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// The order of primary colors in the NeoPixel data stream can vary among
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// device types, manufacturers and even different revisions of the same
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// item. The third parameter to the Adafruit_NeoPixel constructor encodes
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// the per-pixel byte offsets of the red, green and blue primaries (plus
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// white, if present) in the data stream -- the following #defines provide
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// an easier-to-use named version for each permutation. e.g. NEO_GRB
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// indicates a NeoPixel-compatible device expecting three bytes per pixel,
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// with the first byte transmitted containing the green value, second
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// containing red and third containing blue. The in-memory representation
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// of a chain of NeoPixels is the same as the data-stream order; no
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// re-ordering of bytes is required when issuing data to the chain.
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// Most of these values won't exist in real-world devices, but it's done
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// this way so we're ready for it (also, if using the WS2811 driver IC,
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// one might have their pixels set up in any weird permutation).
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// Bits 5,4 of this value are the offset (0-3) from the first byte of a
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// pixel to the location of the red color byte. Bits 3,2 are the green
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// offset and 1,0 are the blue offset. If it is an RGBW-type device
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// (supporting a white primary in addition to R,G,B), bits 7,6 are the
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// offset to the white byte...otherwise, bits 7,6 are set to the same value
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// 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)) ///< Transmit as R,G,B
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#define NEO_RBG ((0<<6) | (0<<4) | (2<<2) | (1)) ///< Transmit as R,B,G
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#define NEO_GRB ((1<<6) | (1<<4) | (0<<2) | (2)) ///< Transmit as G,R,B
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#define NEO_GBR ((2<<6) | (2<<4) | (0<<2) | (1)) ///< Transmit as G,B,R
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#define NEO_BRG ((1<<6) | (1<<4) | (2<<2) | (0)) ///< Transmit as B,R,G
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#define NEO_BGR ((2<<6) | (2<<4) | (1<<2) | (0)) ///< Transmit as B,G,R
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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)) ///< Transmit as W,R,G,B
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#define NEO_WRBG ((0<<6) | (1<<4) | (3<<2) | (2)) ///< Transmit as W,R,B,G
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#define NEO_WGRB ((0<<6) | (2<<4) | (1<<2) | (3)) ///< Transmit as W,G,R,B
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#define NEO_WGBR ((0<<6) | (3<<4) | (1<<2) | (2)) ///< Transmit as W,G,B,R
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#define NEO_WBRG ((0<<6) | (2<<4) | (3<<2) | (1)) ///< Transmit as W,B,R,G
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#define NEO_WBGR ((0<<6) | (3<<4) | (2<<2) | (1)) ///< Transmit as W,B,G,R
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#define NEO_RWGB ((1<<6) | (0<<4) | (2<<2) | (3)) ///< Transmit as R,W,G,B
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#define NEO_RWBG ((1<<6) | (0<<4) | (3<<2) | (2)) ///< Transmit as R,W,B,G
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#define NEO_RGWB ((2<<6) | (0<<4) | (1<<2) | (3)) ///< Transmit as R,G,W,B
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#define NEO_RGBW ((3<<6) | (0<<4) | (1<<2) | (2)) ///< Transmit as R,G,B,W
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#define NEO_RBWG ((2<<6) | (0<<4) | (3<<2) | (1)) ///< Transmit as R,B,W,G
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#define NEO_RBGW ((3<<6) | (0<<4) | (2<<2) | (1)) ///< Transmit as R,B,G,W
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#define NEO_GWRB ((1<<6) | (2<<4) | (0<<2) | (3)) ///< Transmit as G,W,R,B
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#define NEO_GWBR ((1<<6) | (3<<4) | (0<<2) | (2)) ///< Transmit as G,W,B,R
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#define NEO_GRWB ((2<<6) | (1<<4) | (0<<2) | (3)) ///< Transmit as G,R,W,B
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#define NEO_GRBW ((3<<6) | (1<<4) | (0<<2) | (2)) ///< Transmit as G,R,B,W
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#define NEO_GBWR ((2<<6) | (3<<4) | (0<<2) | (1)) ///< Transmit as G,B,W,R
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#define NEO_GBRW ((3<<6) | (2<<4) | (0<<2) | (1)) ///< Transmit as G,B,R,W
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#define NEO_BWRG ((1<<6) | (2<<4) | (3<<2) | (0)) ///< Transmit as B,W,R,G
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#define NEO_BWGR ((1<<6) | (3<<4) | (2<<2) | (0)) ///< Transmit as B,W,G,R
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#define NEO_BRWG ((2<<6) | (1<<4) | (3<<2) | (0)) ///< Transmit as B,R,W,G
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#define NEO_BRGW ((3<<6) | (1<<4) | (2<<2) | (0)) ///< Transmit as B,R,G,W
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#define NEO_BGWR ((2<<6) | (3<<4) | (1<<2) | (0)) ///< Transmit as B,G,W,R
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#define NEO_BGRW ((3<<6) | (2<<4) | (1<<2) | (0)) ///< Transmit as B,G,R,W
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// Add NEO_KHZ400 to the color order value to indicate a 400 KHz device.
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// All but the earliest v1 NeoPixels expect an 800 KHz data stream, this is
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// the default if unspecified. Because flash space is very limited on ATtiny
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// devices (e.g. Trinket, Gemma), v1 NeoPixels aren't handled by default on
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// those chips, though it can be enabled by removing the ifndef/endif below,
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// but code will be bigger. Conversely, can disable the NEO_KHZ400 line on
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// other MCUs to remove v1 support and save a little space.
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#define NEO_KHZ800 0x0000 ///< 800 KHz data transmission
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#ifndef __AVR_ATtiny85__
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#define NEO_KHZ400 0x0100 ///< 400 KHz data transmission
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#endif
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// If 400 KHz support is enabled, the third parameter to the constructor
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// requires a 16-bit value (in order to select 400 vs 800 KHz speed).
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// If only 800 KHz is enabled (as is default on ATtiny), an 8-bit value
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// is sufficient to encode pixel color order, saving some space.
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#ifdef NEO_KHZ400
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typedef uint16_t neoPixelType; ///< 3rd arg to Adafruit_NeoPixel constructor
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#else
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typedef uint8_t neoPixelType; ///< 3rd arg to Adafruit_NeoPixel constructor
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#endif
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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 PROGMEM (flash mem) table containing 8-bit unsigned sine wave (0-255).
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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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static const uint8_t PROGMEM _NeoPixelSineTable[256] = {
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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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static const uint8_t PROGMEM _NeoPixelGammaTable[256] = {
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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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/*!
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@brief Class that stores state and functions for interacting with
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Adafruit NeoPixels and compatible devices.
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*/
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class Adafruit_NeoPixel {
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public:
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// Constructor: number of LEDs, pin number, LED type
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Adafruit_NeoPixel(uint16_t n, uint16_t pin=6,
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neoPixelType type=NEO_GRB + NEO_KHZ800);
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Adafruit_NeoPixel(void);
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~Adafruit_NeoPixel();
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void begin(void);
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void show(void);
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void setPin(uint16_t p);
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void setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b);
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void setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b,
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uint8_t w);
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void setPixelColor(uint16_t n, uint32_t c);
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void fill(uint32_t c=0, uint16_t first=0, uint16_t count=0);
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void setBrightness(uint8_t);
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void clear(void);
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void updateLength(uint16_t n);
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void updateType(neoPixelType t);
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/*!
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@brief Check whether a call to show() will start sending data
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immediately or will 'block' for a required interval. NeoPixels
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require a short quiet time (about 300 microseconds) after the
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last bit is received before the data 'latches' and new data can
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start being received. Usually one's sketch is implicitly using
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this time to generate a new frame of animation...but if it
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finishes very quickly, this function could be used to see if
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there's some idle time available for some low-priority
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concurrent task.
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@return 1 or true if show() will start sending immediately, 0 or false
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if show() would block (meaning some idle time is available).
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*/
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bool canShow(void) {
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if (endTime > micros()) {
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endTime = micros();
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}
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return (micros() - endTime) >= 300L;
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}
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/*!
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@brief Get a pointer directly to the NeoPixel data buffer in RAM.
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Pixel data is stored in a device-native format (a la the NEO_*
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constants) and is not translated here. Applications that access
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this buffer will need to be aware of the specific data format
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and handle colors appropriately.
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@return Pointer to NeoPixel buffer (uint8_t* array).
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@note This is for high-performance applications where calling
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setPixelColor() on every single pixel would be too slow (e.g.
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POV or light-painting projects). There is no bounds checking
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on the array, creating tremendous potential for mayhem if one
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writes past the ends of the buffer. Great power, great
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responsibility and all that.
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*/
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uint8_t *getPixels(void) const { return pixels; };
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uint8_t getBrightness(void) const;
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/*!
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@brief Retrieve the pin number used for NeoPixel data output.
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@return Arduino pin number (-1 if not set).
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*/
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int16_t getPin(void) const { return pin; };
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/*!
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@brief Return the number of pixels in an Adafruit_NeoPixel strip object.
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@return Pixel count (0 if not set).
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*/
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uint16_t numPixels(void) const { return numLEDs; }
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uint32_t getPixelColor(uint16_t n) const;
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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
|
||
|
|
still does the expected contiguous thing.
|
||
|
|
@return Sine result, 0 to 255, or -128 to +127 if type-converted to
|
||
|
|
a signed int8_t, but you'll most likely want unsigned as this
|
||
|
|
output is often used for pixel brightness in animation effects.
|
||
|
|
*/
|
||
|
|
static uint8_t sine8(uint8_t x) {
|
||
|
|
return pgm_read_byte(&_NeoPixelSineTable[x]); // 0-255 in, 0-255 out
|
||
|
|
}
|
||
|
|
/*!
|
||
|
|
@brief An 8-bit gamma-correction function for basic pixel brightness
|
||
|
|
adjustment. Makes color transitions appear more perceptially
|
||
|
|
correct.
|
||
|
|
@param x Input brightness, 0 (minimum or off/black) to 255 (maximum).
|
||
|
|
@return Gamma-adjusted brightness, can then be passed to one of the
|
||
|
|
setPixelColor() functions. This uses a fixed gamma correction
|
||
|
|
exponent of 2.6, which seems reasonably okay for average
|
||
|
|
NeoPixels in average tasks. If you need finer control you'll
|
||
|
|
need to provide your own gamma-correction function instead.
|
||
|
|
*/
|
||
|
|
static uint8_t gamma8(uint8_t x) {
|
||
|
|
return pgm_read_byte(&_NeoPixelGammaTable[x]); // 0-255 in, 0-255 out
|
||
|
|
}
|
||
|
|
/*!
|
||
|
|
@brief Convert separate red, green and blue values into a single
|
||
|
|
"packed" 32-bit RGB color.
|
||
|
|
@param r Red brightness, 0 to 255.
|
||
|
|
@param g Green brightness, 0 to 255.
|
||
|
|
@param b Blue brightness, 0 to 255.
|
||
|
|
@return 32-bit packed RGB value, which can then be assigned to a
|
||
|
|
variable for later use or passed to the setPixelColor()
|
||
|
|
function. Packed RGB format is predictable, regardless of
|
||
|
|
LED strand color order.
|
||
|
|
*/
|
||
|
|
static uint32_t Color(uint8_t r, uint8_t g, uint8_t b) {
|
||
|
|
return ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
|
||
|
|
}
|
||
|
|
/*!
|
||
|
|
@brief Convert separate red, green, blue and white values into a
|
||
|
|
single "packed" 32-bit WRGB color.
|
||
|
|
@param r Red brightness, 0 to 255.
|
||
|
|
@param g Green brightness, 0 to 255.
|
||
|
|
@param b Blue brightness, 0 to 255.
|
||
|
|
@param w White brightness, 0 to 255.
|
||
|
|
@return 32-bit packed WRGB value, which can then be assigned to a
|
||
|
|
variable for later use or passed to the setPixelColor()
|
||
|
|
function. Packed WRGB format is predictable, regardless of
|
||
|
|
LED strand color order.
|
||
|
|
*/
|
||
|
|
static uint32_t Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
|
||
|
|
return ((uint32_t)w << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
|
||
|
|
}
|
||
|
|
static uint32_t ColorHSV(uint16_t hue, uint8_t sat=255, uint8_t val=255);
|
||
|
|
/*!
|
||
|
|
@brief A gamma-correction function for 32-bit packed RGB or WRGB
|
||
|
|
colors. Makes color transitions appear more perceptially
|
||
|
|
correct.
|
||
|
|
@param x 32-bit packed RGB or WRGB color.
|
||
|
|
@return Gamma-adjusted packed color, can then be passed in one of the
|
||
|
|
setPixelColor() functions. Like gamma8(), this uses a fixed
|
||
|
|
gamma correction exponent of 2.6, which seems reasonably okay
|
||
|
|
for average NeoPixels in average tasks. If you need finer
|
||
|
|
control you'll need to provide your own gamma-correction
|
||
|
|
function instead.
|
||
|
|
*/
|
||
|
|
static uint32_t gamma32(uint32_t x);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
|
||
|
|
#ifdef NEO_KHZ400 // If 400 KHz NeoPixel support enabled...
|
||
|
|
bool is800KHz; ///< true if 800 KHz pixels
|
||
|
|
#endif
|
||
|
|
bool begun; ///< true if begin() previously called
|
||
|
|
uint16_t numLEDs; ///< Number of RGB LEDs in strip
|
||
|
|
uint16_t numBytes; ///< Size of 'pixels' buffer below
|
||
|
|
int16_t pin; ///< Output pin number (-1 if not yet set)
|
||
|
|
uint8_t brightness; ///< Strip brightness 0-255 (stored as +1)
|
||
|
|
uint8_t *pixels; ///< Holds LED color values (3 or 4 bytes each)
|
||
|
|
uint8_t rOffset; ///< Red index within each 3- or 4-byte pixel
|
||
|
|
uint8_t gOffset; ///< Index of green byte
|
||
|
|
uint8_t bOffset; ///< Index of blue byte
|
||
|
|
uint8_t wOffset; ///< Index of white (==rOffset if no white)
|
||
|
|
uint32_t endTime; ///< Latch timing reference
|
||
|
|
#ifdef __AVR__
|
||
|
|
volatile uint8_t *port; ///< Output PORT register
|
||
|
|
uint8_t pinMask; ///< Output PORT bitmask
|
||
|
|
#endif
|
||
|
|
#if defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_ARDUINO_CORE_STM32)
|
||
|
|
GPIO_TypeDef *gpioPort; ///< Output GPIO PORT
|
||
|
|
uint32_t gpioPin; ///< Output GPIO PIN
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // ADAFRUIT_NEOPIXEL_H
|