sed1335text.cpp

00001 /*
00002  * mbed LCDWindow library
00003 * Copyright (c) 2010 Hendrik Lipka
00004 *
00005 * Permission is hereby granted, free of charge, to any person obtaining a copy
00006 * of this software and associated documentation files (the "Software"), to deal
00007 * in the Software without restriction, including without limitation the rights
00008 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00009 * copies of the Software, and to permit persons to whom the Software is
00010 * furnished to do so, subject to the following conditions:
00011 *
00012 * The above copyright notice and this permission notice shall be included in
00013 * all copies or substantial portions of the Software.
00014 *
00015 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00016 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00017 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00018 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00019 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00020 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00021 * THE SOFTWARE.
00022 */
00023 
00024 #include "sed1335text.h"
00025 
00026 #include "BusOut.h"
00027 #include "DigitalOut.h"
00028 #include "wait_api.h"
00029 
00030 #define FIRSTBANK_MEM 0
00031 #define SECONDBANK_MEM 0x1000
00032 #define THIRDBANK_MEM 0x800
00033 
00034 #define HIGH(x) ((x&0xff00)>>8)
00035 #define LOW(x) (x&0xff)
00036 
00037 void SED1335TextLCD::writeText(const unsigned int column, const unsigned int row, const char text[]) {
00038     int i=0;
00039     
00040     int pos=row*getColumns ()+column;
00041 
00042     if (!_guard->take())
00043         return;
00044     
00045     sendCmd(0x46); // set cursor addr
00046     sendData(LOW(pos)); 
00047     sendData(HIGH(pos));
00048     
00049     sendCmd(0x42);
00050     while (text[i]!=0) {
00051         sendData(text[i]);
00052         i++;
00053     }
00054     _guard->release();
00055 }
00056 
00057 void SED1335TextLCD::clearBank(int start, int size, int data) {
00058     sendCmd(0x46); // set cursor addr
00059     sendData(LOW(start)); // start of RAM
00060     sendData(HIGH(start));
00061     wait_ms(1);
00062     
00063     sendCmd(0x42); // write to memory
00064     for (int i=0;i<size;i++)
00065         sendData(data);    // send space
00066     wait_ms(1);
00067 }
00068 
00069 void SED1335TextLCD::clear() {
00070     _guard->take();
00071 
00072     clearBank(FIRSTBANK_MEM,getColumns ()*getRows (),0x20);    
00073     clearBank(SECONDBANK_MEM,getColumns ()*getRows ()*8,0);    
00074     clearBank(THIRDBANK_MEM,getColumns ()*getRows (),0);    
00075     
00076     _guard->release();
00077 }
00078 
00079 
00080 void SED1335TextLCD::character(int column, int row, int c){
00081     _guard->take();
00082     _guard->release();
00083 }
00084 
00085 SED1335TextLCD::SED1335TextLCD 
00086 (const unsigned int columns, const unsigned int rows, BusOut *data, const PinName read, const PinName write, const PinName cs, const PinName a0, const PinName reset)
00087         :TextLCDBase(columns, rows) {
00088     _data=data;
00089     _rd=new DigitalOut(read);
00090     _wr=new DigitalOut(write);
00091     _a0=new DigitalOut(a0);
00092     _cs=new DigitalOut(cs);
00093     _reset=new DigitalOut(reset);
00094     wait_ms(100);
00095 }
00096 
00097 void SED1335TextLCD::init() {
00098     initInternal();
00099     initInternal();
00100 }
00101 
00102 void SED1335TextLCD::initInternal() {
00103     _reset->write(0);
00104     wait_ms(2);
00105     _reset->write(1);
00106     wait_ms(10);
00107     
00108     sendCmd(0x40); // SYSTEM SET
00109     sendData(0x30); // p1 set cg rom
00110     sendData(0x87); // p2 
00111     sendData(0x7);  // p3 
00112     sendData(getColumns ()-1); // p4 
00113     sendData(getColumns ()+3); // p5 
00114     sendData(0xef); // p6 
00115     sendData(getColumns ()); // p7 
00116     sendData(0x0);  // p8 
00117     wait_ms(1);
00118 
00119     sendCmd(0x44); // SCROLL
00120     sendData(LOW(FIRSTBANK_MEM)); // first block
00121     sendData(HIGH(FIRSTBANK_MEM));
00122     sendData(getRows ()*8); // lines
00123     sendData(LOW(SECONDBANK_MEM)); // second block
00124     sendData(HIGH(SECONDBANK_MEM));
00125     sendData(getRows ()*8); // lines
00126     sendData(LOW(THIRDBANK_MEM)); // third block at 0x800
00127     sendData(HIGH(THIRDBANK_MEM));
00128     wait_ms(1);
00129     
00130     sendCmd(0x5a); // HDOT SCR
00131     sendData(0x0);
00132         
00133 
00134     sendCmd(0x5b); // OVLAY
00135     sendData(0x01); // 2 layers, text, x-or
00136     wait_ms(1);
00137 
00138     sendCmd(0x59); // DISP on
00139     sendData(0x54); // all layers on, cursor off
00140 //    sendData(0x56); // all layers on, cursor flashing
00141     wait_ms(1);
00142     
00143     clear();
00144     
00145     sendCmd(0x5d); // CSR FORM
00146     sendData(0x04); // 8 pixels wide
00147     sendData(0x86); // 2 pixel high, block cursor
00148     wait_ms(1);
00149     
00150     sendCmd(0x4c); // CSR DIR right
00151     wait_ms(1);
00152     
00153 }
00154 
00155 void SED1335TextLCD::sendCmd(const unsigned char cmd) {
00156     _rd->write(1);
00157     _wr->write(1);
00158     _a0->write(1);
00159     _cs->write(0);
00160     // address setup time is 0
00161     sendByte(cmd);
00162     wait_us(10);
00163 }
00164 
00165 void SED1335TextLCD::sendData(const unsigned char cmd) {
00166     _rd->write(1);
00167     _wr->write(1);
00168     _a0->write(0);
00169     _cs->write(0);
00170     // address setup time is 0
00171     sendByte(cmd);
00172     wait_us(10);
00173 }
00174 
00175 void SED1335TextLCD::sendByte(const unsigned char byte) {
00176     // display reads with rising flank of /wr
00177     // first, set data, then set /wr low (no timing needed)
00178     _data->write(byte);
00179     _wr->write(0);
00180     // wait for setup
00181     wait_us(1);
00182     // set /wr back to high
00183     _wr->write(1);
00184     // address / data hold time is 10 / 5 ns, so its handled by executing normal code :)
00185 }