mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
/*
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* © 2021, Chris Harlow, Neil McKechnie. All rights reserved.
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*
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* This file is part of CommandStation-EX
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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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// CAUTION: the device dependent parts of this class are created in the .ini using LCD_Implementation.h
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#include "LCDDisplay.h"
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void LCDDisplay::clear() {
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clearNative();
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for (byte row=0;row<MAX_LCD_ROWS; row++) rowBuffer[row][0]='\0';
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topRow=-1; // loop2 will fill from row 0
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}
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void LCDDisplay::setRow(byte line) {
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hotRow=line;
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hotCol=0;
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}
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size_t LCDDisplay::write(uint8_t b) {
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if (hotRow>=MAX_LCD_ROWS || hotCol>=MAX_LCD_COLS) return -1;
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rowBuffer[hotRow][hotCol]=b;
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hotCol++;
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rowBuffer[hotRow][hotCol]=0;
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return 1;
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}
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void LCDDisplay::loop() {
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if (!lcdDisplay) return;
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lcdDisplay->loop2(false);
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}
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LCDDisplay *LCDDisplay::loop2(bool force)
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{
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static int rowFirst = -1;
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static int rowNext = 0;
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static int charIndex = 0;
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static char buffer[MAX_LCD_COLS+1];
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static char *bptr = 0;
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static bool done = false;
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unsigned long currentMillis = millis();
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if ((!force) && (currentMillis - lastScrollTime) < LCD_SCROLL_TIME)
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return NULL;
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do {
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if (bptr == 0) {
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// Find a line of data to write to the screen.
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if (!done) {
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if (rowFirst < 0) rowFirst = rowNext;
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// Skip blank rows
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while (rowBuffer[rowNext][0] == 0) {
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rowNext = (rowNext + 1) % MAX_LCD_ROWS;
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if (rowNext == rowFirst) {
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done = true; // All lines done
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break;
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}
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}
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}
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if (!done) {
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// Non-blank line found, so copy it.
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for (int i=0; i<MAX_LCD_COLS+1; i++)
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buffer[i] = rowBuffer[rowNext][i];
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} else
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buffer[0] = '\0'; // Empty line
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setRowNative(slot); // Set position for display
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charIndex = 0;
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bptr = &buffer[0];
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} else {
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// Write next character, or a space to erase current position.
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char ch = *bptr;
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if (ch) {
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writeNative(ch);
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bptr++;
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} else
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writeNative(' ');
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if (++charIndex >= MAX_LCD_COLS) {
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// Screen slot completed, move to next one
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slot++;
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bptr = 0;
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if (!done) {
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rowNext = (rowNext + 1) % MAX_LCD_ROWS;
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if (rowNext == rowFirst) done = true;
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}
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}
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if (slot >= lcdRows) {
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// Last slot finished, reset ready for next update.
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slot = 0;
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done = false;
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rowFirst = -1;
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lastScrollTime = currentMillis;
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return NULL;
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}
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}
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} while (force);
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return NULL;
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}
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