116 lines
3.3 KiB
PHP
116 lines
3.3 KiB
PHP
<?php
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/*
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* Copyright (C) 2014, NoccyLabs
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>
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*/
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namespace NoccyLabs\Gpio\Device\Display;
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use NoccyLabs\Gpio\Device\Device;
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class Pcd8544Device extends Device
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{
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protected function configure()
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{
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$this
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->setName("pcd8544")
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->setDescription("Philips PCD8544 LCD Display Driver")
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->addPin("dc", "data/command")
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->addPin("sce", "chip select")
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->addPin("scl", "clock")
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->addPin("sda", "data")
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->addPin("res", "reset")
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->addPin("bl", "backlight")
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;
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}
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protected function startup()
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{
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}
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public function setBacklightState($state)
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{
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$this->bl->setValue((bool)$state);
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}
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public function initialize()
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{
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$this->lcdInit();
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}
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public function lcdSend($byte, $command=false)
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{
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// assume clk is hi
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// Enable display controller (active low).
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$this->sce->setValue(0);
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$this->dc->setValue((int)$command); // command or data
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$this->shiftOut($this->sda, $this->scl, $byte);
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// Disable display controller.
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$this->sce->setValue(1);
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/*
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if (!$command) {
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$this->cx++;
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if ($this->cx > (LCD_X_RES - 1)) {
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cx = 0; cy++;
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#ifdef PCD8544_FIX_YALIGN
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// Soft wrapping when FIX_YALIGN is defined
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lcd_cursor(cx,cy);
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#endif
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}
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}
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*/
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}
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public function lcdInit()
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{
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$this->sce->setDirection("out");
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$this->res->setDirection("out");
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$this->dc->setDirection("out");
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$this->scl->setDirection("out");
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$this->sda->setDirection("out");
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$this->res->setValue(1); // set RES
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$this->sce->setValue(0); // reset SCE
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$this->res->setValue(0); // pull RES low
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$this->res->setValue(0); // and back hick
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// Send sequence of command
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$this->lcdSend( 0x21, true ); // LCD Extended Commands.
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// lcd_send( 0xC8, true ); // Set LCD Vop (Contrast).
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$this->lcdSend( 0x80 | 0x70, true ); // Set LCD Vop (Contrast).
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$this->lcdSend( 0x06, true ); // Set Temp coefficent to 2.
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$this->lcdSend( 0x13, true ); // LCD bias mode 1:100.
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#ifdef PCD8544_FIX_YALIGN
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$this->lcdSend( 0x45, true ); // LCD blank - Shift LCD 5 up (row starts at 1)
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#endif
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$this->lcdSend( 0x20, true ); // LCD Standard Commands, Horizontal addressing mode.
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$this->lcdSend( 0x40, true ); // LCD blank
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$this->lcdSend( 0x08, true ); // LCD blank
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$this->lcdSend( 0x0C, true ); // LCD in inverse mode.
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//$this->lcdClear();
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}
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}
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