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/*-------------------------------------------------------------------------
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NeoPixel library helper functions for Esp8266.
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FIXED VERSION FROM https://github.com/Makuna/NeoPixelBus/pull/894
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This library will overlay/shadow the base version from NeoPixelBus
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Written by Michael C. Miller.
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Thanks to g3gg0.de for porting the initial DMA support which lead to this.
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Thanks to github/cnlohr for the original work on DMA support, which opend
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all our minds to a better way (located at https://github.com/cnlohr/esp8266ws2812i2s).
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I invest time and resources providing this open source code,
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please support me by donating (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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#ifdef ARDUINO_ARCH_ESP8266
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#include "internal/methods/NeoEsp8266DmaMethod.h"
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template<typename T_PATTERN> class NeoEsp8266Dma3StepEncodeFixed : public T_PATTERN
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{
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public:
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const static size_t DmaBitsPerPixelBit = 3; // 3 step cadence, matches encoding
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static size_t SpacingPixelSize(size_t sizePixel)
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{
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return sizePixel;
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}
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static void FillBuffers(uint8_t* i2sBuffer,
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const uint8_t* data,
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size_t sizeData,
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[[maybe_unused]] size_t sizePixel)
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{
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const uint8_t SrcBitMask = 0x80;
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const size_t BitsInSample = sizeof(uint32_t) * 8;
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uint32_t* pDma = reinterpret_cast<uint32_t*>(i2sBuffer);
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uint32_t dmaValue = 0;
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uint8_t destBitsLeft = BitsInSample;
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const uint8_t* pSrc = data;
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const uint8_t* pEnd = pSrc + sizeData;
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while (pSrc < pEnd)
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{
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uint8_t value = *(pSrc++);
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for (uint8_t bitSrc = 0; bitSrc < 8; bitSrc++)
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{
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const uint16_t Bit = ((value & SrcBitMask) ? T_PATTERN::OneBit3Step : T_PATTERN::ZeroBit3Step);
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if (destBitsLeft > 3)
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{
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destBitsLeft -= 3;
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dmaValue |= Bit << destBitsLeft;
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#if defined(NEO_DEBUG_DUMP_I2S_BUFFER)
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NeoUtil::PrintBin<uint32_t>(dmaValue);
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Serial.print(" < ");
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Serial.println(destBitsLeft);
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#endif
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}
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else if (destBitsLeft <= 3)
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{
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uint8_t bitSplit = (3 - destBitsLeft);
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dmaValue |= Bit >> bitSplit;
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#if defined(NEO_DEBUG_DUMP_I2S_BUFFER)
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NeoUtil::PrintBin<uint32_t>(dmaValue);
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Serial.print(" > ");
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Serial.println(bitSplit);
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#endif
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// next dma value, store and reset
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*(pDma++) = dmaValue;
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dmaValue = 0;
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destBitsLeft = BitsInSample - bitSplit;
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if (bitSplit)
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{
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dmaValue |= Bit << destBitsLeft;
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}
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#if defined(NEO_DEBUG_DUMP_I2S_BUFFER)
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NeoUtil::PrintBin<uint32_t>(dmaValue);
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Serial.print(" v ");
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Serial.println(bitSplit);
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#endif
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}
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// Next
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value <<= 1;
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}
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}
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// store the remaining bits
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if (destBitsLeft != BitsInSample) *pDma++ = dmaValue;
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}
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};
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// Abuse explict specialization to overlay the methods
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template<> class NeoEsp8266Dma3StepEncode<NeoEsp8266DmaNormalPattern> : public NeoEsp8266Dma3StepEncodeFixed<NeoEsp8266DmaNormalPattern> {};
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template<> class NeoEsp8266Dma3StepEncode<NeoEsp8266DmaInvertedPattern> : public NeoEsp8266Dma3StepEncodeFixed<NeoEsp8266DmaInvertedPattern> {};
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#endif
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Will Miles