mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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204 lines
6.7 KiB
C++
204 lines
6.7 KiB
C++
/*
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* © 2023, Neil McKechnie. All rights reserved.
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*
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* This file is part of DCC++EX API
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*
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* This 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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* It 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 CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* This driver provides a more immediate interface into the OLED display
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* than the one installed through the config.h file. When an LCD(...) call
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* is made, the text is output immediately to the specified display line,
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* without waiting for the next 2.5 second refresh. However, if the line
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* specified is off the screen then the text in the bottom line will be
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* overwritten. There is however a special case that if line 255 is specified,
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* the existing text will scroll up and the new line added to the bottom
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* line of the screen.
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*
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* To install, use the following command in myHal.cpp:
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* OLEDDisplay::create(address, width, height);
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*
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* where address is the I2C address (0x3c or 0x3d),
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* width is the width in pixels of the display, and
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* height is the height in pixels of the display.
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*
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* Valid width and height are 128x32 (SSD1306 controller),
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* 128x64 (SSD1306) and 132x64 (SH1106). The driver uses
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* a 5x7 character set in a 6x8 pixel cell.
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*/
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#ifndef IO_OLEDDISPLAY_H
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#define IO_OLEDDISPLAY_H
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#include "IODevice.h"
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#include "DisplayInterface.h"
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#include "SSD1306Ascii.h"
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#include "version.h"
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class OLEDDisplay : public IODevice, DisplayInterface {
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private:
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// Here we define the device-specific variables.
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uint8_t _height; // in pixels
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uint8_t _width; // in pixels
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SSD1306AsciiWire *oled;
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uint8_t _rowNo = 0; // Row number being written by caller
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uint8_t _colNo = 0; // Position in line being written by caller
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uint8_t _numRows;
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uint8_t _numCols;
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char *_buffer = NULL;
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uint8_t *_rowGeneration = NULL;
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uint8_t *_lastRowGeneration = NULL;
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uint8_t _rowNoToScreen = 0;
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uint8_t _charPosToScreen = 0;
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public:
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// Static function to handle "OLEDDisplay::create(...)" calls.
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static void create(I2CAddress i2cAddress, int width = 128, int height=64) {
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/* if (checkNoOverlap(i2cAddress)) */ new OLEDDisplay(i2cAddress, width, height);
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}
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protected:
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// Constructor
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OLEDDisplay(I2CAddress i2cAddress, int width, int height) {
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_I2CAddress = i2cAddress;
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_width = width;
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_height = height;
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_numCols = _width / 6; // character block 6 x 8
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_numRows = _height / 8;
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_charPosToScreen = _numCols;
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// Allocate arrays
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_buffer = (char *)calloc(_numRows*_numCols, sizeof(char));
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_rowGeneration = (uint8_t *)calloc(_numRows, sizeof(uint8_t));
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_lastRowGeneration = (uint8_t *)calloc(_numRows, sizeof(uint8_t));
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addDevice(this);
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}
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// Device-specific initialisation
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void _begin() override {
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// Create OLED driver
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oled = new SSD1306AsciiWire();
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// Initialise device
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if (oled->begin(_I2CAddress, _width, _height)) {
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// Store pointer to this object into CS display hook, so that we
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// will intercept any subsequent calls to lcdDisplay methods.
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DisplayInterface::lcdDisplay = this;
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DIAG(F("OLEDDisplay installed on address x%x"), (int)_I2CAddress);
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// First clear the entire screen
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oled->clearNative();
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// Set first two lines on screen
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LCD(0,F("DCC++ EX v%S"),F(VERSION));
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LCD(1,F("Lic GPLv3"));
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}
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}
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void _loop(unsigned long) override {
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// Loop through the buffer and if a row has changed
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// (rowGeneration[row] is changed) then start writing the
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// characters from the buffer, one character per entry,
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// to the screen until that row has been refreshed.
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// First check if the OLED driver is still busy from a previous
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// call. If so, don't to anything until the next entry.
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if (!oled->isBusy()) {
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// Check if we've just done the end of a row or just started
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if (_charPosToScreen >= _numCols) {
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// Move to next line
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if (++_rowNoToScreen >= _numRows)
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_rowNoToScreen = 0; // Wrap to first row
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if (_rowGeneration[_rowNoToScreen] != _lastRowGeneration[_rowNoToScreen]) {
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// Row content has changed, so start outputting it
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_lastRowGeneration[_rowNoToScreen] = _rowGeneration[_rowNoToScreen];
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oled->setRowNative(_rowNoToScreen);
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_charPosToScreen = 0; // Prepare to output first character on next entry
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} else {
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// Row not changed, don't bother writing it.
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}
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} else {
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// output character at current position
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oled->writeNative(_buffer[_rowNoToScreen*_numCols+_charPosToScreen++]);
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}
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}
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return;
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}
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/////////////////////////////////////////////////
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// DisplayInterface functions
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//
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/////////////////////////////////////////////////
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DisplayInterface* loop2(bool force) override {
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(void)force; // suppress compiler warning
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return NULL;
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}
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// Position on nominated line number (0 to number of lines -1)
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// Clear the line in the buffer ready for updating
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void setRow(byte line) override {
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if (line == 255) {
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// LCD(255, "xxx") - scroll the contents of the buffer
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// and put the new line at the bottom of the screen
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for (int row=1; row<_numRows; row++) {
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strncpy(&_buffer[(row-1)*_numCols], &_buffer[row*_numCols], _numCols);
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_rowGeneration[row-1]++;
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}
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line = _numRows-1;
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} else if (line >= _numRows)
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line = _numRows - 1; // Overwrite bottom line.
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_rowNo = line;
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// Fill line with blanks
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for (_colNo = 0; _colNo < _numCols; _colNo++)
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_buffer[_rowNo*_numCols+_colNo] = ' ';
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_colNo = 0;
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// Mark that the buffer has been touched. It will be
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// sent to the screen on the next loop entry.
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_rowGeneration[_rowNo]++;
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}
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// Write blanks to all of the screen (blocks until complete)
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void clear () override {
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// Clear buffer
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for (_rowNo = 0; _rowNo < _numRows; _rowNo++) {
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setRow(_rowNo);
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}
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_rowNo = 0;
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}
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// Write one character
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size_t write(uint8_t c) override {
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// Write character to buffer (if space)
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if (_colNo < _numCols)
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_buffer[_rowNo*_numCols+_colNo++] = c;
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return 1;
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}
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// Display information about the device.
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void _display() {
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DIAG(F("OLEDDisplay Configured addr x%x"), (int)_I2CAddress);
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}
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};
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#endif // IO_OLEDDISPLAY_H
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