411 lines
8.2 KiB
C++
411 lines
8.2 KiB
C++
/*
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* Copyright (c) 2018, Lionel Adrien Sambuc
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Arduino.h>
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#include <MsTimer2.h>
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#include "FrameBuffer.h"
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/* All the code assumes dimensions are below 127, as signed chars are used to
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* store positions and indices. */
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#define MAX_X 4
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#define MAX_Y 4
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#define MAX_Z 4
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#define BRIGHTNESS_LEVELS 16
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#define BRIGHTNESS_MAX 256
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// Positions (x,y) to pin, same for all layers.
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static char position2pin[MAX_X][MAX_Y] = {
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{13, 12, 11, 10},
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{ 9, 8, 7, 6},
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{ 5, 4, 3, 2},
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{ 1, 0, A5, A4}
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};
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// z-coordinate position to pin.
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static char layer[MAX_Z] = { A0, A1, A2, A3 };
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static unsigned char font[][4][4] = {
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// a
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{
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{0,0,0,0},
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,1},
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},
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// b
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{
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{1,0,0,0},
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,0},
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},
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// c
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{
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{0,0,0,0},
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{1,1,1,0},
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{1,0,0,0},
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{1,1,1,0},
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},
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// d
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{
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{0,0,1,0},
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,0},
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},
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// e
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{
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{1,1,1,0},
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{1,1,1,0},
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{1,0,0,0},
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{1,1,1,0},
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},
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// f
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{
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{1,1,1,0},
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{1,0,0,0},
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{1,1,0,0},
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{1,0,0,0},
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},
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// g
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{
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{1,1,1,1},
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{1,0,0,0},
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{1,0,1,1},
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{1,1,1,1},
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},
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// h
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{
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{1,0,0,0},
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{1,0,0,0},
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{1,1,1,0},
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{1,0,1,0},
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},
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// i
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{
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{0,1,0,0},
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{0,0,0,0},
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{0,1,0,0},
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{0,1,0,0},
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},
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// j
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{
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{0,0,1,0},
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{0,0,1,0},
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{1,0,1,0},
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{1,1,1,0},
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},
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// k
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{
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{1,0,0,0},
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{1,0,1,0},
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{1,1,0,0},
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{1,0,1,0},
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},
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// l
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{
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{0,1,0,0},
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{0,1,0,0},
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{0,1,0,0},
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{0,1,1,0},
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},
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// M
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{
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{1,0,0,1},
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{1,1,1,1},
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{1,0,0,1},
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{1,0,0,1},
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},
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// n
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{
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{0,0,0,0},
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{1,0,1,1},
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{0,1,0,1},
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{0,1,0,1},
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},
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// o
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{
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{0,0,0,0},
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,0},
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},
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// p
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{
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,0},
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{1,0,0,0},
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},
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// q
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{
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,0},
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{0,0,1,0},
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},
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// r
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{
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{1,1,1,0},
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{1,0,1,0},
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{1,1,1,0},
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{1,0,0,1},
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},
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// s
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{
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{1,1,1,0},
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{0,1,0,0},
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{0,0,1,0},
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{1,1,1,0},
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},
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// T
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{
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{1,1,1,0},
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{0,1,0,0},
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{0,1,0,0},
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{0,1,0,0},
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},
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// u
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{
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{0,0,0,0},
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{1,0,1,0},
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{1,0,1,0},
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{1,1,1,0},
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},
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// v
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{
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{0,0,0,0},
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{1,0,1,0},
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{1,0,1,0},
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{0,1,0,0},
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},
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// Ww
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{
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{1,0,0,1},
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{1,0,0,1},
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{1,1,1,1},
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{1,0,0,1},
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},
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// x
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{
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{0,0,0,0},
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{1,0,1,0},
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{1,1,1,0},
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{1,0,1,0},
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},
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// y
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{
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{0,0,0,0},
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{1,0,1,0},
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{0,1,0,0},
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{0,1,0,0},
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},
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// z
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{
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{1,1,1,1},
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{0,0,1,0},
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{0,1,0,0},
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{1,1,1,1},
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}
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};
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#define FRAMEBUFFER_POINTERS 1 /* Either 1 (Enabled) or 0 (disabled) */
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#if FRAMEBUFFER_POINTERS
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struct Frame frames[2];
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struct FrameBuffer {
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unsigned char intensity = 0;
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Frame *front = &frames[0];
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Frame *back = &frames[1];
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} FrameBuffer;
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#else
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struct FrameBuffer {
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unsigned char visible = 0;
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unsigned char intensity = 0;
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Frame frames[2];
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} FrameBuffer;
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#endif
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extern char position2pin[MAX_X][MAX_Y];
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extern char layer[MAX_Z];
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void FrameBufferSwitch(void) {
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#if FRAMEBUFFER_POINTERS
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Frame * t = FrameBuffer.back;
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FrameBuffer.back = FrameBuffer.front;
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FrameBuffer.front = t;
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#else
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FrameBuffer.visible = (FrameBuffer.visible + 1) & 0x1;
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#endif
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}
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Frame *FrameBufferGetFront(void) {
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#if FRAMEBUFFER_POINTERS
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return FrameBuffer.front;
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#else
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return &FrameBuffer.frames[FrameBuffer.visible];
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#endif
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}
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Frame *FrameBufferGetBack(void) {
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#if FRAMEBUFFER_POINTERS
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return FrameBuffer.back;
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#else
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return &FrameBuffer.frames[(FrameBuffer.visible + 1) & 0x1];
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#endif
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}
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void FrameBufferWrite(char x, char y, char z, unsigned char val) {
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FrameBufferGetBack()->data[x][y][z] = val;
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}
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static void letter(char l, char brightness) {
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memset(FrameBufferGetBack(), 0, FRAME_SIZE());
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for (char x = 0; x < MAX_X; x++) {
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for (char y = 0; y < MAX_Y; y++) {
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FrameBufferGetBack()->data[3][y][3-x] =
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font[l - 'a'][x][y] * brightness;
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}
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}
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FrameBufferSwitch();
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delay(200);
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}
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void printAllSymbols() {
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for(char c = 0; c < sizeof(font)/sizeof(font[0]); c++) {
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letter(c+'a', 127);
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delay(500);
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}
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}
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void FrameBufferWriteStr(char * str, const short delayPerLetter,
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const unsigned char brightness) {
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unsigned char *c = str;
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while(*c != 0) {
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if (*c == ' ') {
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memset(FrameBufferGetBack(), 0, FRAME_SIZE());
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FrameBufferSwitch();
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} else {
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letter(*c, brightness);
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}
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delay(delayPerLetter);
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// Make sure there is a white space between font
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memset(FrameBufferGetBack(), 0, FRAME_SIZE());
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FrameBufferSwitch();
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delay(delayPerLetter/4);
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c++;
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}
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}
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void FrameBufferRefresh(void) {
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Frame *f = FrameBufferGetFront();
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#if BRIGHTNESS_INCREMENT
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FrameBuffer.intensity =
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(FrameBuffer.intensity + BRIGHTNESS_INCREMENT) % BRIGHTNESS_MAX;
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#else
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FrameBuffer.intensity = 128;
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#endif
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#if DEBUG_FB_REFRESH
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static int timeStartRefresh = micros();
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static int timeLastRefresh = 0;
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#endif
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for (char z = 0; z < MAX_Z; z++) {
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// 1. Set up the layer leds to be turned on / off
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for (char x = 0; x < MAX_X; x++) {
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for (char y = 0; y < MAX_Y; y++) {
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if (f->data[x][y][z] > FrameBuffer.intensity) {
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digitalWrite(position2pin[x][y], HIGH);
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} else {
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digitalWrite(position2pin[x][y], LOW);
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}
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}
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}
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// 2. Turn the power on on the layer
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digitalWrite(layer[z], LOW);
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// Let it display
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#if BRIGHTNESS_LEVELS
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delayMicroseconds(FRAME_PERIOD / (MAX_Z * BRIGHTNESS_LEVELS));
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#else
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delayMicroseconds(FRAME_PERIOD / MAX_Z);
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#endif
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// 3. Turn the power off on the layer
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digitalWrite(layer[z], HIGH);
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}
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#if DEBUG_FB_REFRESH
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Serial.print("Time Since last refresh: ");
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Serial.println((timeStartRefresh - timeLastRefresh), DEC);
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timeLastRefresh = micros();
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Serial.print("Period Refresh Time: ");
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Serial.println((timeLastRefresh - timeStartRefresh), DEC);
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#endif
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}
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void FrameBufferInit(void) {
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// Setting rows to ouput
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for (char x = 0; x < MAX_X; x++) {
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for (char y = 0; y < MAX_Y; y++) {
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pinMode(position2pin[x][y], OUTPUT);
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digitalWrite(position2pin[x][y], LOW);
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}
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}
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// Setting layers to output
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for (char z = 0; z < MAX_Z; z++) {
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pinMode(layer[z], OUTPUT);
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digitalWrite(layer[z], HIGH);
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}
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// Initialize FrameBuffers
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memset(FrameBufferGetFront(), 0, FRAME_SIZE());
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memset(FrameBufferGetBack(), 0, FRAME_SIZE());
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#if BRIGHTNESS_LEVELS
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MsTimer2::set(FRAME_PERIOD / (1000 * BRIGHTNESS_LEVELS),
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FrameBufferRefresh);
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#else
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MsTimer2::set(FRAME_PERIOD / (1000), FrameBufferRefresh);
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#endif
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MsTimer2::start();
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}
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