Diff: Display.cpp

Revision:

4:424dd7f7b12c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Display.cpp	Mon May 06 08:00:51 2013 +0000
@@ -0,0 +1,196 @@
+#include "Display.h"
+
+
+/* Create a Display interface (default : 16X2 screen)
+* 
+* @param pinGreenLED    greenLED broche
+* @param pinRedLED      redLED broche
+* @param pinOrangeLED   orangeLED broche
+* @param pinLCDrs       LCD Instruction/data control line
+* @param pinLCDe        LCD Enable line (clock)
+* @param pinLCDd0-d3    LCD Data lines     
+*/
+Display::Display(PinName pinGreenLED, PinName pinRedLED, PinName pinOrangeLED, PinName pinLCDrs, PinName pinLCDe,
+        PinName pinLCDd0, PinName pinLCDd1, PinName pinLCDd2, PinName pinLCDd3) : _greenLED(pinGreenLED), _redLED(pinRedLED), 
+        _orangeLED(pinOrangeLED), _lcd(pinLCDrs, pinLCDe, pinLCDd0, pinLCDd1, pinLCDd2, pinLCDd3)
+{
+    this->clear();
+}
+
+/* Create a Display interface
+* 
+* @param pinGreenLED    greenLED broche
+* @param pinRedLED      redLED broche
+* @param pinOrangeLED   orangeLED broche
+* @param pinLCDrs       LCD Instruction/data control line
+* @param pinLCDe        LCD Enable line (clock)
+* @param pinLCDd0-d3    LCD Data lines
+* @param typeScreen     LCD Sets the panel size/addressing mode (default = LCD16x2)
+*/
+Display::Display(PinName pinGreenLED, PinName pinRedLED, PinName pinOrangeLED, PinName pinLCDrs, PinName pinLCDe,
+        PinName pinLCDd0, PinName pinLCDd1, PinName pinLCDd2, PinName pinLCDd3, TextLCD::LCDType typeScreen) : 
+            _greenLED(pinGreenLED), _redLED(pinRedLED), _orangeLED(pinOrangeLED), 
+            _lcd(pinLCDrs, pinLCDe, pinLCDd0, pinLCDd1, pinLCDd2, pinLCDd3, typeScreen)
+{
+    this->clear();
+}
+
+/* Destructor
+*/
+Display::~Display()
+{
+}
+
+/* print message on LCD screen and change status of green, red and orange LED
+* all line except the last line, have to finish by '\n'. Warning : '\n' count like a character
+* don't end message by '\n'
+*
+* @param message            message will be display on screen
+* @param statusGreenLED     new status of greenLED (on, off, flash)
+* @param statusRedLED       new status of redLED (on, off, flash)
+* @param statusOrangeLED    new status of orangeLED (on, off, flash)
+*/
+void Display::printMessage(string message, choiceStatusLED statusGreenLED, choiceStatusLED statusRedLED, choiceStatusLED statusOrangeLED) {
+    // clear LCD screen and shutdown 3 LED
+    this->clear();
+    
+    // change green LED status to statusGreenLED
+    this->changeStatusLED(Display::green, statusGreenLED);
+    // ...
+    this->changeStatusLED(Display::red, statusRedLED);
+    this->changeStatusLED(Display::orange, statusOrangeLED);
+    
+    if (this->checkMessage(message))    
+        // print message on LCD screen
+        this->_lcd.printf("%s\n", message.c_str());
+    else
+        this->_lcd.printf("this message can't show rigthly");
+}
+
+
+/* put off 3 LED and clear LCD screen
+*/
+void Display::clear(void) {
+    this->shutdownLED();
+    this->cls();
+}
+
+
+
+/* change led status to statusLED
+* use by printMessage()
+*
+* @param led        the led (green, red, orange)
+* @param statusLED  new status (on, off, flash)
+*/
+void Display::changeStatusLED(choiceLED led, choiceStatusLED statusLED) {
+    Led *ptr_led;
+    
+    // select LED 
+    switch (led) {
+    case green : ptr_led = &_greenLED;
+                break;
+    case red : ptr_led = &_redLED;
+                break;
+    default : ptr_led = &_orangeLED;
+                break;
+    }
+    
+    // change this status
+    switch (statusLED) {
+    case on : ptr_led->on();
+                break;
+    case flash : ptr_led->flash();
+                break;
+    default : ptr_led->off();
+                break;
+    }
+}
+
+/* put off 3 LED
+* use by clear()
+*/
+void Display::shutdownLED(void) {
+    _greenLED.off(); _redLED.off(); _orangeLED.off();
+}
+
+/* clear LCD screen
+* use by clear()
+*/
+void Display::cls(void) {
+    _lcd.cls();
+}
+
+/* check if this message can be display correctly on LCD screen 
+* use by printMessage()
+*
+* @param message    the message to be verified
+* @return 
+*        true if message is ok
+*        flase else
+*/
+bool Display::checkMessage(string message) {
+    // check message length (don't exceed screen capacity)
+    unsigned int screenSize = _lcd.columns() * _lcd.rows();
+    if (message.length() > screenSize)
+        return false;
+    
+    // check number of '\n'
+    // TextLCD is circular, so if we are on last line, a '\n' we come back on first line
+    int nbCRLF = this->calculNbCRLF(message);
+    if (nbCRLF >= _lcd.rows())
+        return false;
+    
+    // check all line length (don't exceed column capacity)
+    std::vector<std::string> allLine = this->subAllLine(message);
+    int lineLength;
+    for (unsigned int i = 0; i < allLine.size(); i++) {
+        lineLength = allLine[i].length();
+        if (lineLength > _lcd.columns())
+            return false;
+    }
+    
+    
+    return true;
+}
+
+/* calcul number of '\n'
+* use by checkMessage()
+*
+* @param message    the message to be analyse
+* @return number of '\n'
+*/ 
+int Display::calculNbCRLF(string message) {
+    unsigned int index = 0, nbCRLF = 0;
+    
+    while ((index = message.find('\n', index)) != std::string::npos) {      // npos is a static member constant of string,
+        nbCRLF++;                                                           // defined with a value of -1
+        index++;
+    }
+    
+    return nbCRLF;
+}
+
+/* return vector of all line message
+* use by checkMessage()
+*
+* @param message    the message to be cut
+* @return   a vector which contains a line of the message by entry
+*/
+vector<string> Display::subAllLine(string message) {
+    std::vector<std::string> allLine;
+    unsigned int index = 0, indexNext = 0; 
+    
+    // get next '\n' from last position
+    while ((indexNext = message.find('\n', index)) != std::string::npos) {
+        // sub new line (with '\n')
+        allLine.push_back(message.substr(index, indexNext-index+1));
+        // go to next line
+        index = indexNext + 1;
+    }
+    
+    // get last line
+    allLine.push_back(message.substr(index));
+        
+    return allLine;
+}
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