LCD.cpp

00001 /*
00002  *  Marc Le Labourier
00003  *  16/02/2016
00004  */
00005  
00006  #include "LCD.h"
00007  
00008 LCD::LCD() : _host(D11, D13, D12, D7, D10)
00009 {
00010     _line = 0;
00011     _pos = 0;
00012     _it = _buffer.begin();
00013 }
00014 
00015 LCD::~LCD()
00016 {
00017     _buffer.clear();
00018 }
00019 
00020 C12832&     LCD::Host()
00021 {
00022     return _host;
00023 }
00024 
00025 /* Clear process:
00026  * The screen buffer is full...
00027  * We need to extract one line and to redisplay the content from the start of the buffer.
00028  * If we do not wait during the process, the screen will not be readable.
00029  * The wait_ms is responsible of the 'scrolling effect'.
00030  */
00031 void                LCD::clear()
00032 {
00033     wait_ms(1000);
00034     if (_buffer.size() > SCREEN_SIZE)
00035         _buffer.pop_front();
00036     _host.cls();
00037 }
00038 
00039 /* Push a string to be rendered on the LCD screen:
00040  * Long string are split in many other and added to the buffer.
00041  */
00042 void                LCD::print(const std::string& s)
00043 {
00044     if (s.size() > SCREEN_CHAR)
00045     {
00046         for (size_t i = 0; i < s.size(); i += SCREEN_CHAR)
00047         {
00048             std::string tmp = s.substr(i, SCREEN_CHAR);
00049             _buffer.push_back(tmp);
00050         }
00051     }
00052     else
00053         _buffer.push_back(s);
00054     printAll();
00055 }
00056 
00057 /* Update the screen process
00058  * Update the screen with the new input from the print() method.
00059  * All the magic is done here.
00060  */
00061 void                LCD::printAll()
00062 {
00063     if (_it == _buffer.end())
00064     {
00065         _it = _buffer.begin();
00066         for (int i = 0; i < _line; ++i)
00067             ++_it;
00068     }
00069     for (; _it != _buffer.end(); ++_it)
00070     {
00071         if (_line > SCREEN_SIZE)
00072         {
00073             _line = 0;
00074             _pos = 0;
00075             clear();
00076             _it = _buffer.begin();
00077         }
00078         std::string s = *_it;
00079         printOne(s, _pos);
00080         _pos += SCREEN_PADDING;
00081         ++_line;
00082     }
00083 }
00084 
00085 /* Render a string on the screen */
00086 void                LCD::printOne(const std::string& s, int index)
00087 {
00088     _host.locate(0, index);
00089     _host.printf("%s", s.c_str());
00090 }