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CommandStation-EX/LCDDisplay.cpp

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/*
* © 2020, Chris Harlow. All rights reserved.
*
* This file is part of CommandStation-EX
*
* This 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.
*
* It 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 CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
// CAUTION: the device dependent parts of this class are created in the .ini using LCD_Implementation.h
#include "LCDDisplay.h"
void LCDDisplay::clear() {
clearNative();
for (byte row=0;row<MAX_LCD_ROWS; row++) rowBuffer[row][0]='\0';
topRow=-1; // loop2 will fill from row 0
}
void LCDDisplay::setRow(byte line) {
hotRow=line;
hotCol=0;
}
size_t LCDDisplay::write(uint8_t b) {
if (hotRow>=MAX_LCD_ROWS || hotCol>=MAX_LCD_COLS) return -1;
rowBuffer[hotRow][hotCol]=b;
hotCol++;
rowBuffer[hotRow][hotCol]=0;
return 1;
}
void LCDDisplay::loop() {
if (!lcdDisplay) return;
lcdDisplay->loop2(false);
}
LCDDisplay* LCDDisplay::loop2(bool force) {
if ((!force) && (millis() - lastScrollTime)< LCD_SCROLL_TIME) return NULL;
lastScrollTime=millis();
clearNative();
int rowFirst=nextFilledRow();
if (rowFirst<0)return NULL; // No filled rows
setRowNative(0);
writeNative(rowBuffer[rowFirst]);
for (int slot=1;slot<lcdRows;slot++) {
int rowNext=nextFilledRow();
if (rowNext==rowFirst){
// we have wrapped around and not filled the screen
topRow=-1; // start again at first row next time.
break;
}
setRowNative(slot);
writeNative(rowBuffer[rowNext]);
}
displayNative();
return NULL;
}
int LCDDisplay::nextFilledRow() {
for (int rx=1;rx<=MAX_LCD_ROWS;rx++) {
topRow++;
topRow %= MAX_LCD_ROWS;
if (rowBuffer[topRow][0]) return topRow;
}
return -1; // No slots filled
}