TextDisplay.cpp

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