50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// NeoPixel ring driver.
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//
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// Copyright 2015 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#pragma once
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#include <stdint.h>
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/// NeoPixel ring driver.
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///
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/// Implemented as a bit-banged loop.
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///
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class NeoPixel {
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public:
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NeoPixel() { clear(); }
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void init();
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void clear();
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void append(uint8_t b);
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void write();
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private:
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static const int MaxLEDs = 16;
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static const int BitsPerColour = 8;
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static const int ColoursPerLED = 3;
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static const int Tail = 2;
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static const uint8_t Reload = F_CPU / 800000;
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static const uint8_t Low = Reload * 2 / 3;
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static const uint8_t High = Reload - Low;
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static const uint8_t Stop = 0xFF;
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uint8_t* p_;
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uint8_t bits_[MaxLEDs * ColoursPerLED * BitsPerColour + Tail];
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};
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