TextDisplay.cpp

00001 /* mbed TextDisplay Display Library Base Class
00002  * Copyright (c) 2007-2009 sford
00003  * Released under the MIT License: http://mbed.org/license/mit
00004  */
00005 
00006 #include "TextDisplay.h"
00007 
00008 //#define DEBUG "Text"
00009 // ...
00010 // INFO("Stuff to show %d", var); // new-line is automatically appended
00011 //
00012 #if (defined(DEBUG) && !defined(TARGET_LPC11U24))
00013 #define INFO(x, ...) std::printf("[INF %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00014 #define WARN(x, ...) std::printf("[WRN %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00015 #define ERR(x, ...)  std::printf("[ERR %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00016 #else
00017 #define INFO(x, ...)
00018 #define WARN(x, ...)
00019 #define ERR(x, ...)
00020 #endif
00021 
00022 TextDisplay::TextDisplay(const char *name) : Stream(name)
00023 {
00024     _row = 0;
00025     _column = 0;
00026     if (name == NULL) {
00027         _path = NULL;
00028     } else {
00029         int len = strlen(name) + 2;
00030         _path = new char[len];
00031         snprintf(_path, len, "/%s", name);
00032     }
00033 }
00034 
00035 //TextDisplay::~TextDisplay()
00036 //{
00037 //    delete [] _path;
00038 //}
00039 
00040 int TextDisplay::_putc(int value)
00041 {
00042     INFO("_putc(%d)", value);
00043     if(value == '\n') {
00044         _column = 0;
00045         _row++;
00046         if(_row >= rows()) {
00047             _row = 0;
00048         }
00049     } else {
00050         character(_column, _row, value);
00051         _column++;
00052         if(_column >= columns()) {
00053             _column = 0;
00054             _row++;
00055             if(_row >= rows()) {
00056                 _row = 0;
00057             }
00058         }
00059     }
00060     return value;
00061 }
00062 
00063 // crude cls implementation, should generally be overwritten in derived class
00064 RetCode_t TextDisplay::cls(uint16_t layers)
00065 {
00066     INFO("cls()");
00067     locate(0, 0);
00068     for(int i=0; i<columns()*rows(); i++) {
00069         putc(' ');
00070     }
00071     return noerror;
00072 }
00073 
00074 RetCode_t TextDisplay::locate(textloc_t column, textloc_t row)
00075 {
00076     INFO("locate(%d,%d)", column, row);
00077     _column = column;
00078     _row = row;
00079     return noerror;
00080 }
00081 
00082 int TextDisplay::_getc()
00083 {
00084     return -1;
00085 }
00086 
00087 RetCode_t TextDisplay::foreground(uint16_t color)
00088 {
00089     //INFO("foreground(%4X)", color);
00090     _foreground = color;
00091     return noerror;
00092 }
00093 
00094 RetCode_t TextDisplay::background(uint16_t color)
00095 {
00096     //INFO("background(%4X)", color);
00097     _background = color;
00098     return noerror;
00099 }
00100 
00101 bool TextDisplay::claim(FILE *stream)
00102 {
00103     if ( _path == NULL) {
00104         fprintf(stderr, "claim requires a name to be given in the instantiator of the TextDisplay instance!\r\n");
00105         return false;
00106     }
00107     if (freopen(_path, "w", stream) == NULL) {
00108         return false;       // Failed, should not happen
00109     }
00110     // make sure we use line buffering
00111     setvbuf(stdout, NULL, _IOLBF, columns());
00112     return true;
00113 }
00114