299bed1c05
5.9.1f * Upgrade library ArduinoJson to 5.11.2 * Upgrade library IRRemoteEsp8266 to 2.2.1 + 2 commits but tweaked some protocols to keep code usage small * Upgrade library NeoPixelBus to 2.2.9 * Upgrade library OneWire to 2.3.3 + 6 commits * Formalize library PubSubClient to 2.6 + 9 commits and additional delay * Add optional ADS1115 driver as alternative for unsupported I2Cdevlib in esp8266-core 2.4.0-rc2 * Fix wrong response name for command HlwISet (#1214)
126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
/*-------------------------------------------------------------------------
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NeoPixel library helper functions for DotStars using SPI hardware (APA102).
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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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#include <SPI.h>
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class DotStarSpiMethod
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{
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public:
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DotStarSpiMethod(uint16_t pixelCount, size_t elementSize) :
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_sizeData(pixelCount * elementSize),
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_sizeSendBuffer(calcBufferSize(pixelCount * elementSize))
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{
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_sendBuffer = (uint8_t*)malloc(_sizeSendBuffer);
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memset(_sendBuffer, 0, _sizeSendBuffer);
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setEndFrameBytes();
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}
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~DotStarSpiMethod()
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{
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SPI.end();
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free(_sendBuffer);
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}
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bool IsReadyToUpdate() const
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{
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return true; // dot stars don't have a required delay
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}
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void Initialize()
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{
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SPI.begin();
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#if defined(ARDUINO_ARCH_ESP8266)
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SPI.setFrequency(20000000L);
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#elif defined(ARDUINO_ARCH_AVR)
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SPI.setClockDivider(SPI_CLOCK_DIV2); // 8 MHz (6 MHz on Pro Trinket 3V)
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#else
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SPI.setClockDivider((F_CPU + 4000000L) / 8000000L); // 8-ish MHz on Due
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#endif
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SPI.setBitOrder(MSBFIRST);
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SPI.setDataMode(SPI_MODE0);
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}
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void Update()
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{
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// due to API inconsistencies need to call different methods on SPI
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#if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
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SPI.writeBytes(_sendBuffer, _sizeSendBuffer);
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#else
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SPI.transfer(_sendBuffer, _sizeSendBuffer);
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#endif
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}
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uint8_t* getPixels() const
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{
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return _sendBuffer + _countStartFrame;
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};
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size_t getPixelsSize() const
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{
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return _sizeData;
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};
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private:
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const size_t _countStartFrame = 4;
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const size_t _sizeData; // size of actuall pixel data within _sendBuffer
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const size_t _sizeSendBuffer; // Size of '_sendBuffer' buffer below
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uint8_t* _sendBuffer; // Holds SPI send Buffer, including LED color values
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size_t calcBufferSize(size_t sizePixels) const
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{
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const size_t countEndFrameBytes = calcEndFrameSize(sizePixels);
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// start frame + data + end frame
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const size_t bufferSize = _countStartFrame + sizePixels + countEndFrameBytes;
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return bufferSize;
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}
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size_t calcEndFrameSize(size_t sizePixels) const
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{
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// end frame
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// one bit for every two pixels with no less than 1 byte
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return ((sizePixels / 4) + 15) / 16;
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}
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void setEndFrameBytes()
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{
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uint8_t* pEndFrame = _sendBuffer + _countStartFrame + _sizeData;
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uint8_t* pEndFrameStop = pEndFrame + calcEndFrameSize(_sizeData);
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while (pEndFrame != pEndFrameStop)
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{
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*pEndFrame++ = 0xff;
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}
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}
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};
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