LCDText.cpp

00001 #include "LCDText.h"
00002 
00003 void clearLCD() {
00004     char buff[33];
00005     memset(buff, ' ', 32);
00006     buff[32] = '\0';
00007     mylcd.printf(buff);
00008 }
00009 
00010 //clears LCD and prints the two strings centered on each line
00011 //max length of each string is 16
00012 void printLCD(const char* string1, const char* string2) {
00013     char buff[33];
00014     memset(buff, ' ', 32);
00015     buff[32] = '\0';
00016     //clear LCD
00017     clearLCD();
00018     
00019     //print to LCD
00020     if(string1) {
00021         memcpy(buff+(16-strlen(string1))/2, string1, strlen(string1));
00022     }
00023     if(string2) {
00024         memcpy(buff+16+(16-strlen(string2))/2, string2, strlen(string2));
00025     }
00026     mylcd.printf(buff);
00027 }
00028 
00029 //creates a menu with with a title, controlled by the up/down/select buttons
00030 //returns index of option selected
00031 int displayMenu(const char* menuTitle, const char** menuOptions, int numOptions) {
00032     int curSelection = 0;
00033     
00034     printLCD(menuTitle, menuOptions[curSelection]);
00035     if(!up || !down || !select || !back) wait(.3);
00036     while(1) {
00037         if(!up) {
00038             curSelection = (curSelection == numOptions-1) ? 0 : (curSelection + 1);
00039             printLCD(menuTitle, menuOptions[curSelection]);
00040             if(!up) wait(.2);
00041         }
00042         if(!down) {
00043             curSelection = (curSelection == 0) ? (numOptions - 1) : (curSelection - 1);
00044             printLCD(menuTitle, menuOptions[curSelection]);
00045             if(!down) wait(.2);
00046         }
00047         if(!select) {
00048             clearLCD();
00049             return curSelection;
00050         }
00051         if(!back) {
00052             clearLCD();
00053             return -1;
00054         }
00055     }
00056 }