mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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256 lines
8.3 KiB
C++
256 lines
8.3 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 way of driving a ST7735 TFT display through SCREEN(disp,line,"text").
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* If the line 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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* TFTDisplay::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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*/
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#ifndef IO_TFTDISPLAY_H
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#define IO_TFTDDISPLAY_H
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#include "IODevice.h"
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#include "DisplayInterface.h"
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#include "version.h"
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template <class T>
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class TFTDisplay : public IODevice, public DisplayInterface {
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private:
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uint8_t _displayNo = 0;
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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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T *_displayDriver;
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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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DisplayInterface *_nextDisplay = NULL;
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uint8_t _selectedDisplayNo = 0;
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public:
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// Static function to handle "TFTDisplay::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 TFTDisplay(0, i2cAddress, width, height);
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}
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static void create(uint8_t displayNo, I2CAddress i2cAddress, int width = 128, int height=64) {
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/* if (checkNoOverlap(i2cAddress)) */ new TFTDisplay(displayNo, i2cAddress, width, height);
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}
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protected:
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// Constructor
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TFTDisplay(uint8_t displayNo, I2CAddress i2cAddress, int width, int height) {
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_displayDriver = new T(i2cAddress, width, height);
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_displayNo = displayNo;
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_I2CAddress = i2cAddress;
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_width = width;
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_height = height;
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_numCols = (_width+5) / 6; // character block 6 x 8, round up
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_numRows = _height / 8; // Round down
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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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// Fill buffer with spaces
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memset(_buffer, ' ', _numCols*_numRows);
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_displayDriver->clearNative();
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// Is this the main display?
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if (_displayNo == 0) {
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// Set first two lines on screen
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this->setRow(0, 0);
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print(F("DCC-EX v"));
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print(F(VERSION));
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setRow(0, 1);
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print(F("Lic GPLv3"));
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}
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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 displayHandler methods.
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// Make a note of the existing display reference, to that we can
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// pass on anything we're not interested in.
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_nextDisplay = DisplayInterface::displayHandler;
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DisplayInterface::displayHandler = this;
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addDevice(this);
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}
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void screenUpdate() {
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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 (!_displayDriver->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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_displayDriver->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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_displayDriver->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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// IODevice Class Member Overrides
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/////////////////////////////////////////////////
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// Device-specific initialisation
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void _begin() override {
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// Initialise device
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if (_displayDriver->begin()) {
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DIAG(F("TFTDisplay installed on address %s as screen %d"),
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_I2CAddress.toString(), _displayNo);
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// Force all rows to be redrawn
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for (uint8_t row=0; row<_numRows; row++)
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_rowGeneration[row]++;
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// Start with top line (looks better)
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_rowNoToScreen = _numRows;
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_charPosToScreen = _numCols;
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}
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}
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void _loop(unsigned long) override {
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screenUpdate();
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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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public:
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void loop() override {
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screenUpdate();
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if (_nextDisplay)
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_nextDisplay->loop(); // continue to next display
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return;
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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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// The displayNo referenced here is remembered and any following
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// calls to write() will be directed to that display.
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void setRow(uint8_t displayNo, byte line) override {
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_selectedDisplayNo = displayNo;
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if (displayNo == _displayNo) {
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if (line == 255) {
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// LCD(255,"xxx") or SCREEN(displayNo,255, "xxx") -
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// scroll the contents of the buffer and put the new line
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// 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, by which time
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// the line should have been written to the buffer.
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_rowGeneration[_rowNo]++;
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}
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if (_nextDisplay)
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_nextDisplay->setRow(displayNo, line); // Pass to next display
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}
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// Write one character to the screen referenced in the last setRow() call.
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size_t write(uint8_t c) override {
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if (_selectedDisplayNo == _displayNo) {
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// Write character to buffer (if there's space)
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if (_colNo < _numCols) {
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_buffer[_rowNo*_numCols+_colNo++] = c;
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}
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}
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if (_nextDisplay)
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_nextDisplay->write(c);
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return 1;
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}
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// Write blanks to all of the screen (blocks until complete)
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void clear (uint8_t displayNo) override {
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if (displayNo == _displayNo) {
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// Clear buffer
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for (_rowNo = 0; _rowNo < _numRows; _rowNo++) {
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setRow(displayNo, _rowNo);
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}
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_rowNo = 0;
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}
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if (_nextDisplay)
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_nextDisplay->clear(displayNo); // Pass to next display
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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("TFTDisplay %d Configured addr %s"), _displayNo, _I2CAddress.toString());
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}
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};
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#endif // IO_TFTDDISPLAY_H
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