MHVLib
20111011
An efficiency oriented runtime library for AVR microcontrollers
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00001 /* Copyright (c) 2011, Make, Hack, Void Inc 00002 * All rights reserved. 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions are met: 00006 * * Redistributions of source code must retain the above copyright 00007 * notice, this list of conditions and the following disclaimer. 00008 * * Redistributions in binary form must reproduce the above copyright 00009 * notice, this list of conditions and the following disclaimer in the 00010 * documentation and/or other materials provided with the distribution. 00011 * * Neither the name of the Make, Hack, Void nor the 00012 * names of its contributors may be used to endorse or promote products 00013 * derived from this software without specific prior written permission. 00014 * 00015 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 00016 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00017 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00018 * DISCLAIMED. IN NO EVENT SHALL MAKE, HACK, VOID BE LIABLE FOR ANY 00019 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00020 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00021 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00022 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00023 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00024 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00025 */ 00026 00027 #include "MHV_PWMMatrix.h" 00028 #include <string.h> 00029 #include <math.h> 00030 00031 #define pixel(pixelCol, pixelRow) _frameBuffer[pixelRow * _colCount + pixelCol] 00032 00045 MHV_PWMMatrix::MHV_PWMMatrix(uint16_t rowCount, uint16_t colCount, uint8_t *frameBuffer, 00046 MHV_RingBuffer *txBuffers, 00047 void (*rowOn)(uint16_t row), 00048 void (*rowOff)(uint16_t row), 00049 void (*colOn)(uint16_t column), 00050 void (*colOff)(uint16_t column), 00051 MHV_PWMMATRIX_MODE mode) : 00052 MHV_Display_Monochrome_Buffered (rowCount, colCount, frameBuffer, txBuffers) { 00053 uint8_t i; 00054 00055 _currentRow = 0; 00056 _currentCol = 0; 00057 _currentLevel = 0; 00058 00059 if (MHV_PWMMATRIX_MODE_AUTO == mode) { 00060 _mode = (rowCount <= colCount) ? MHV_PWMMATRIX_MODE_ROWS : MHV_PWMMATRIX_MODE_COLS; 00061 } else { 00062 _mode = mode; 00063 } 00064 00065 _rowOn = rowOn; 00066 _rowOff = rowOff; 00067 _colOn = colOn; 00068 _colOff = colOff; 00069 00070 for (i = 0; i < _rowCount; i++) { 00071 _rowOff(i); 00072 } 00073 for (i = 0; i < _colCount; i++) { 00074 _colOff(i); 00075 } 00076 } 00077 00081 inline void MHV_PWMMatrix::tickRow(void) { 00082 uint16_t i; 00083 00084 if (0 == _currentLevel) { 00085 // Turn on the current row 00086 _rowOn(_currentRow); 00087 for (i = 0; i < _colCount; i++) { 00088 if (pixel(i, _currentRow) > 0) { 00089 _colOn(i); 00090 } 00091 } 00092 } else { 00093 // Turn off pixels that get switched off on this pass 00094 for (i = 0; i < _colCount; i++) { 00095 if (pixel(i, _currentRow) <= _currentLevel) { 00096 _colOff(i); 00097 } 00098 } 00099 } 00100 00101 if (255 == ++_currentLevel) { 00102 // Turn off the current row & advance 00103 _rowOff(_currentRow); 00104 00105 _currentLevel = 0; 00106 if (++_currentRow == _rowCount) { 00107 _currentRow = 0; 00108 } 00109 } 00110 } 00111 00115 inline void MHV_PWMMatrix::tickCol(void) { 00116 uint16_t i; 00117 00118 if (0 == _currentLevel) { 00119 // Turn on the current column 00120 _colOn(_currentCol); 00121 for (i = 0; i < _rowCount; i++) { 00122 if (pixel(_currentCol, i) > 0) { 00123 _rowOn(i); 00124 } 00125 } 00126 } else { 00127 // Turn off pixels that get switched off on this pass 00128 for (i = 0; i < _rowCount; i++) { 00129 if (pixel(_currentCol, i) <= _currentLevel) { 00130 _rowOff(i); 00131 } 00132 } 00133 } 00134 00135 if (255 == ++_currentLevel) { 00136 // Turn off the current column & advance 00137 _colOff(_currentCol); 00138 00139 _currentLevel = 0; 00140 if (++_currentCol == _colCount) { 00141 _currentCol = 0; 00142 } 00143 } 00144 } 00145 00149 inline void MHV_PWMMatrix::tickPixel(void) { 00150 if (0 == _currentLevel) { 00151 // Turn on the pixel at the current row & column 00152 _colOn(_currentCol); 00153 _rowOn(_currentRow); 00154 } else if (pixel(_currentRow, _currentCol) <= _currentLevel) { 00155 // Turn off the pixel 00156 _colOff(_currentCol); 00157 _rowOff(_currentRow); 00158 } 00159 00160 if (255 == ++_currentLevel) { 00161 // Advance the column 00162 if (++_currentCol == _colCount) { 00163 _currentCol = 0; 00164 00165 // Advance the row 00166 if (++_currentRow == _rowCount) { 00167 _currentRow = 0; 00168 } 00169 } 00170 } 00171 } 00172 00173 00174 /* Process a timer tick 00175 */ 00176 void MHV_PWMMatrix::tick(void) { 00177 switch (_mode) { 00178 case MHV_PWMMATRIX_MODE_ROWS: 00179 tickRow(); 00180 break; 00181 case MHV_PWMMATRIX_MODE_COLS: 00182 tickCol(); 00183 break; 00184 case MHV_PWMMATRIX_MODE_INDIVIDUAL: 00185 tickPixel(); 00186 break; 00187 default: 00188 break; 00189 } 00190 }