lcd2s.cpp

00001 /**
00002  * File:      lcd2s.cpp
00003  * 
00004  * Author:    Modtronix Engineering - www.modtronix.com
00005  * 
00006  * Description:
00007  * 
00008  * Software License Agreement:
00009  * This software has been written or modified by Modtronix Engineering. The code
00010  * may be modified and can be used free of charge for commercial and non commercial
00011  * applications. If this is modified software, any license conditions from original
00012  * software also apply. Any redistribution must include reference to 'Modtronix
00013  * Engineering' and web link(www.modtronix.com) in the file header. 
00014  * 
00015  * THIS SOFTWARE IS PROVIDED IN AN 'AS IS' CONDITION. NO WARRANTIES, WHETHER EXPRESS,
00016  * IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
00017  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE
00018  * COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
00019  * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
00020  */ 
00021 #include "mbed.h"
00022 #include "lcd2s.h"
00023 
00024 
00025 // DEFINES ////////////////////////////////////////////////////////////////////
00026 
00027 
00028 // GLOBAL VARIABLES ///////////////////////////////////////////////////////////
00029 #if (LCD2S_USE_MALLOC == 0)
00030 uint8_t buf[80];
00031 uint32_t dirtyRows[4];
00032 #endif
00033 
00034 // Function Prototypes ////////////////////////////////////////////////////////
00035 
00036 
00037 // DEBUG ////////////////////////////////////////////////////////////////////
00038 //IMPORTANT, when enabling debugging, it is very important to note the following:
00039 //- If (MX_DEBUG_IS_POINTER==1), ensure there is global Stream pointer defined somewhere in code to override "pMxDebug = NULL" below!
00040 //- If (MX_DEBUG_IS_POINTER==0), define a mxDebug() function somewhere in code to handel debug output
00041 #define DEBUG_ENABLE            1
00042 #if (DEBUG_ENABLE==1) && !defined(NDEBUG)
00043 //Alternative method in stead of using NULL below. This requires to create derived Stream class in each file we want to use debugging
00044 //    class modtronixDebugStream : public Stream {int _putc(int value) {return 0;}int _getc() {return 0;}};
00045 //    static modtronixDebugStream modtronixDebug;
00046 //    WEAK Stream* pMxDebug = &modtronixDebug;
00047     #if (MX_DEBUG_IS_POINTER==1)        //More efficient, but only works if pMxDebug is defined in code. Disabled by default!
00048         WEAK Stream* pMxDebug = NULL;
00049         #define MX_DEBUG  pMxDebug->printf
00050     #else
00051         WEAK void mxDebug(const char *format, ...) {}
00052         #define MX_DEBUG mxDebug
00053     #endif
00054 #else
00055     //GCC's CPP has extensions; it allows for macros with a variable number of arguments. We use this extension here to preprocess pmesg away.
00056     #define MX_DEBUG(format, args...) ((void)0)
00057 #endif
00058 
00059 
00060 
00061 LCD2S::LCD2S(uint8_t rows/* = 4*/, uint8_t columns/* = 20*/) {
00062     contrast = 200;
00063     brightness = 200;
00064     this->rows = rows;
00065     this->columns = columns;
00066     bufSize = rows * columns;
00067     cursor_row = cursor_col = 0;
00068 
00069     //MX_DEBUG("\r\nLCD2S()");
00070 
00071 #if (LCD2S_USE_MALLOC == 1)
00072     buf = new uint8_t[bufSize)];
00073     dirtyRows = new uint32_t(rows);
00074 #endif
00075 
00076     pBuf = buf;
00077     pDirtyRows = dirtyRows;
00078     memset(pBuf, ' ', sizeof(buf));
00079     memset(pDirtyRows, 0, 4 * rows);
00080 }
00081 
00082 void LCD2S::clearDisplay() {
00083     memset(pBuf, ' ', sizeof(buf));
00084     memset(pDirtyRows, 0xff, 4 * rows);
00085 }
00086 
00087 void LCD2S::setCursor(int8_t row, int8_t col) {
00088     cursor_row = row-1;
00089     if(cursor_row > rows)
00090         cursor_row = rows-1;
00091 
00092     cursor_col = col-1;
00093     if(cursor_col > columns)
00094         cursor_col = columns-1;
00095 };
00096