forked from Makuna/NeoPixelBus
Michael Miller
b32f719e95
functional optional moved to common location topology signed warnings cleaned up
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/*-------------------------------------------------------------------------
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NeoPixel library helper functions
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Written by Michael C. Miller.
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I invest time and resources providing this open source code,
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please support me by dontating (see https://github.com/Makuna/NeoPixelBus)
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-------------------------------------------------------------------------
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This file is part of the Makuna/NeoPixelBus library.
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NeoPixelBus 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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NeoPixelBus 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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#pragma once
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// some platforms do not come with STL or properly defined one, specifically functional
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// if you see...
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// undefined reference to `std::__throw_bad_function_call()'
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// ...then you can either add the platform symbol to the list so NEOPIXEBUS_NO_STL gets defined or
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// go to boards.txt and enable c++ by adding (teensy31.build.flags.libs=-lstdc++) and set to "smallest code" option in Arduino
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//
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#if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR) || defined(STM32L432xx) || defined(STM32L476xx) || defined(ARDUINO_ARCH_SAM)
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#define NEOPIXEBUS_NO_STL 1
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#endif
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// some platforms do not define this standard progmem type for some reason
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//
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#ifndef PGM_VOID_P
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#define PGM_VOID_P const void *
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#endif
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#ifndef countof
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#define countof(array) (sizeof(array)/sizeof(array[0]))
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#endif
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class NeoUtil
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{
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private:
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static constexpr uint8_t Reverse8BitsLookup[16] = {
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0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
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0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
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public:
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inline static uint8_t Reverse8Bits(uint8_t n)
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{
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return (Reverse8BitsLookup[n & 0b1111] << 4) | Reverse8BitsLookup[n >> 4];
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}
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inline static size_t RoundUp(size_t numToRound, size_t multiple)
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{
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return ((numToRound + multiple - 1) / multiple) * multiple;
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}
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// alternatives that proved to be slower but left for more periodic testing
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/*
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// marginally slower than the table
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static uint8_t Reverse8Bits(uint8_t b)
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{
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b = (b & 0b11110000) >> 4 | (b & 0b00001111) << 4;
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b = (b & 0b11001100) >> 2 | (b & 0b00110011) << 2;
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b = (b & 0b10101010) >> 1 | (b & 0b01010101) << 1;
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return b;
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}
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*/
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/* WAY TO SLOW
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static uint8_t Reverse8Bits(uint8_t b)
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{
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return (b * 0x0202020202ULL & 0x010884422010ULL) % 1023;
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}
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*/
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}; |