mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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109 lines
4.4 KiB
C++
109 lines
4.4 KiB
C++
/* Based on Arduino SSD1306Ascii Library, Copyright (C) 2015 by William Greiman
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* Modifications (C) 2021 Neil McKechnie
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This Library 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino SSD1306Ascii Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "SSD1306Ascii.h"
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#include "I2CManager.h"
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#include "FSH.h"
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// Maximum number of bytes we can send per transmission is 32.
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const uint8_t SSD1306AsciiWire::blankPixels[16] =
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{0x40, // First byte specifies data mode
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
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//==============================================================================
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// SSD1306AsciiWire Method Definitions
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//------------------------------------------------------------------------------
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void SSD1306AsciiWire::clear() {
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clear(0, displayWidth() - 1, 0, displayRows() - 1);
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}
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//------------------------------------------------------------------------------
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void SSD1306AsciiWire::clear(uint8_t columnStart, uint8_t columnEnd,
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uint8_t rowStart, uint8_t rowEnd) {
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const int maxBytes = sizeof(blankPixels); // max number of bytes sendable over Wire
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// Ensure only rows on display will be cleared.
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if (rowEnd >= displayRows()) rowEnd = displayRows() - 1;
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for (uint8_t r = rowStart; r <= rowEnd; r++) {
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setCursor(columnStart, r); // Position at start of row to be erased
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for (uint8_t c = columnStart; c <= columnEnd; c += maxBytes-1) {
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uint8_t len = min((uint8_t)(columnEnd-c+1), maxBytes-1) + 1;
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I2CManager.write(m_i2cAddr, blankPixels, len); // Write up to 15 blank columns
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}
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}
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}
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//------------------------------------------------------------------------------
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void SSD1306AsciiWire::begin(const DevType* dev, uint8_t i2cAddr) {
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m_i2cAddr = i2cAddr;
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m_col = 0;
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m_row = 0;
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#ifdef __AVR__
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const uint8_t* table = (const uint8_t*)pgm_read_word(&dev->initcmds);
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#else // __AVR__
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const uint8_t* table = dev->initcmds;
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#endif // __AVR
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uint8_t size = readFontByte(&dev->initSize);
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m_displayWidth = readFontByte(&dev->lcdWidth);
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m_displayHeight = readFontByte(&dev->lcdHeight);
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m_colOffset = readFontByte(&dev->colOffset);
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I2CManager.write_P(m_i2cAddr, table, size);
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}
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//------------------------------------------------------------------------------
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void SSD1306AsciiWire::setContrast(uint8_t value) {
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I2CManager.write(m_i2cAddr, 2,
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0x00, // Set to command mode
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SSD1306_SETCONTRAST, value);
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}
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//------------------------------------------------------------------------------
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void SSD1306AsciiWire::setCursor(uint8_t col, uint8_t row) {
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if (row < displayRows() && col < m_displayWidth) {
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m_row = row;
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m_col = col + m_colOffset;
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I2CManager.write(m_i2cAddr, 4,
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0x00, // Set to command mode
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SSD1306_SETLOWCOLUMN | (col & 0XF),
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SSD1306_SETHIGHCOLUMN | (col >> 4),
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SSD1306_SETSTARTPAGE | m_row);
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}
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}
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//------------------------------------------------------------------------------
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void SSD1306AsciiWire::setFont(const uint8_t* font) {
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m_font = font;
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m_fontFirstChar = readFontByte(m_font + FONT_FIRST_CHAR);
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m_fontCharCount = readFontByte(m_font + FONT_CHAR_COUNT);
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}
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//------------------------------------------------------------------------------
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size_t SSD1306AsciiWire::write(uint8_t ch) {
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const uint8_t* base = m_font + FONT_WIDTH_TABLE;
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if (ch < m_fontFirstChar || ch >= (m_fontFirstChar + m_fontCharCount))
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return 0;
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ch -= m_fontFirstChar;
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base += fontWidth * ch;
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uint8_t buffer[1+fontWidth+letterSpacing];
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buffer[0] = 0x40; // set SSD1306 controller to data mode
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uint8_t bufferPos = 1;
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// Copy character pixel columns
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for (uint8_t i = 0; i < fontWidth; i++)
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buffer[bufferPos++] = readFontByte(base++);
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// Add blank pixels between letters
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for (uint8_t i = 0; i < letterSpacing; i++)
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buffer[bufferPos++] = 0;
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// Write the data to I2C display
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I2CManager.write(m_i2cAddr, buffer, bufferPos);
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return 1;
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}
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