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CommandStation-EX/SSD1306/SSD1306Ascii.cpp
2021-02-19 12:43:24 +00:00

121 lines
4.2 KiB
C++

/* Based on Arduino SSD1306Ascii Library, Copyright (C) 2015 by William Greiman
* Modifications (C) 2021 Neil McKechnie
*
* This Library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Arduino SSD1306Ascii Library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include "SSD1306Ascii.h"
//------------------------------------------------------------------------------
void SSD1306Ascii::clear() {
clear(0, displayWidth() - 1, 0 , displayRows() - 1);
}
//------------------------------------------------------------------------------
void SSD1306Ascii::clear(uint8_t c0, uint8_t c1, uint8_t r0, uint8_t r1) {
// Ensure only rows on display will be cleared.
if (r1 >= displayRows()) r1 = displayRows() - 1;
for (uint8_t r = r0; r <= r1; r++) {
setCursor(c0, r);
for (uint8_t c = c0; c <= c1; c++)
ssd1306WriteRamBuf(0);
}
setCursor(c0, r0);
}
//------------------------------------------------------------------------------
void SSD1306Ascii::init(const DevType* dev) {
m_col = 0;
m_row = 0;
#ifdef __AVR__
const uint8_t* table = (const uint8_t*)pgm_read_word(&dev->initcmds);
#else // __AVR__
const uint8_t* table = dev->initcmds;
#endif // __AVR
uint8_t size = readFontByte(&dev->initSize);
m_displayWidth = readFontByte(&dev->lcdWidth);
m_displayHeight = readFontByte(&dev->lcdHeight);
m_colOffset = readFontByte(&dev->colOffset);
for (uint8_t i = 0; i < size; i++) {
ssd1306WriteCmd(readFontByte(table + i));
}
clear();
}
//------------------------------------------------------------------------------
void SSD1306Ascii::setCol(uint8_t col) {
if (col < m_displayWidth) {
m_col = col;
col += m_colOffset;
ssd1306WriteCmd(SSD1306_SETLOWCOLUMN | (col & 0XF));
ssd1306WriteCmd(SSD1306_SETHIGHCOLUMN | (col >> 4));
}
}
//------------------------------------------------------------------------------
void SSD1306Ascii::setContrast(uint8_t value) {
ssd1306WriteCmd(SSD1306_SETCONTRAST);
ssd1306WriteCmd(value);
}
//------------------------------------------------------------------------------
void SSD1306Ascii::setCursor(uint8_t col, uint8_t row) {
setCol(col);
setRow(row);
}
//------------------------------------------------------------------------------
void SSD1306Ascii::setFont(const uint8_t* font) {
m_font = font;
}
//------------------------------------------------------------------------------
void SSD1306Ascii::setRow(uint8_t row) {
if (row < displayRows()) {
m_row = row;
ssd1306WriteCmd(SSD1306_SETSTARTPAGE | m_row);
}
}
//------------------------------------------------------------------------------
void SSD1306Ascii::ssd1306WriteRam(uint8_t c) {
if (m_col < m_displayWidth) {
writeDisplay(c, SSD1306_MODE_RAM);
m_col++;
}
}
//------------------------------------------------------------------------------
void SSD1306Ascii::ssd1306WriteRamBuf(uint8_t c) {
if (m_col < m_displayWidth) {
writeDisplay(c, SSD1306_MODE_RAM_BUF);
m_col++;
}
}
//------------------------------------------------------------------------------
size_t SSD1306Ascii::write(uint8_t ch) {
if (!m_font) {
return 0;
}
const uint8_t* base = m_font + FONT_WIDTH_TABLE;
const uint8_t letterSpacing = 1;
uint8_t fontFirstChar = readFontByte(m_font + FONT_FIRST_CHAR);
uint8_t fontCharCount = readFontByte(m_font + FONT_CHAR_COUNT);
uint8_t fontWidth = readFontByte(m_font + FONT_WIDTH);
if (ch < fontFirstChar || ch >= (fontFirstChar + fontCharCount)) return 0;
ch -= fontFirstChar;
base += fontWidth * ch;
for (uint8_t c = 0; c < fontWidth; c++) {
uint8_t b = readFontByte(base + c);
ssd1306WriteRamBuf(b);
}
for (uint8_t i = 0; i < letterSpacing; i++) {
ssd1306WriteRamBuf(0);
}
flushDisplay();
return 1;
}