dispBoB.cpp

00001 //NXP PCA9635 library
00002 //mbed Team     -   28th June 2011
00003 //Daniel Worrall
00004 
00005 #include "mbed.h"
00006 #include "PCA9635.h"
00007 #include "dispBoB.h"
00008 
00009 
00010     static const char loc[] = {0x02, 0x02, 0x04, 0x04, 0x10, 0x10, 0x12, 0x12}; 
00011     static const short dispL[] = {
00012     0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00013     0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00014     0x0000, 0x1008, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0002, 0xC006, 0x600C, 0x0000, 0x0000, 0x0000, 0x0001, 0x1000, 0x0000,
00015     0xE00E, 0x2008, 0xC00D, 0x600D, 0x200B, 0x6007, 0xE007, 0x200E, 0xE00F, 0x600F, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00016     
00017     0x0000, 0xE00D, 0xE003, 0xC001, 0xE009, 0xC007, 0x8007, 0x600F, 0xA003, 0x8000, 0x6008, 0xA007, 0xC002, 0xA005, 0xA001, 0xE001,
00018     0x800F, 0x200F, 0x8001, 0x6007, 0xC003, 0xE000, 0xE000, 0xE004, 0xA00B, 0x600B, 0xC00D, 0xC006, 0x0000, 0x600C, 0x0000, 0x4000,
00019     0x1000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00020     0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0xC006, 0x0000, 0x600C, 0x0000, 0x0000
00021     };
00022     static const short dispR[] = {
00023     0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00024     0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00025     0x0000, 0x0180, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0020, 0x0C60, 0x06C0, 0x0000, 0x0000, 0x0000, 0x0010, 0x0100, 0x0000,
00026     0x0EE0, 0x0280, 0x0CD0, 0x06D0, 0x02B0, 0x0670, 0x0E70, 0x02E0, 0x0EF0, 0x06F0, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00027     
00028     0x0000, 0x0ED0, 0x0E30, 0x0C10, 0x0E90, 0x0C70, 0x0870, 0x06F0, 0x0A30, 0x0800, 0x0680, 0x0A70, 0x0C20, 0x0A50, 0x0A10, 0x0E10,
00029     0x08F0, 0x02F0, 0x0810, 0x0670, 0x0C30, 0x0E00, 0x0E00, 0x0E40, 0x0AB0, 0x06B0, 0x0CD0, 0x0C60, 0x0000, 0x06C0, 0x0000, 0x0400,
00030     0x0100, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
00031     0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0C60, 0x0000, 0x06C0, 0x0000, 0x0000
00032     };
00033     short element[8];
00034     short ppair[4];
00035     string nullArray = "      ";
00036 
00037 dispBoB::dispBoB(PinName sda, PinName scl, PinName en): _pca(sda, scl), _en(en) {
00038     init();
00039 }
00040 void dispBoB::init(void){                           //initiate - call this whenever the system needs to be reset
00041     _en = 0;
00042     _pca.init(loc[0]);
00043     _pca.init(loc[2]);
00044     _pca.init(loc[4]);
00045     _pca.init(loc[6]);
00046 }
00047 
00048 void dispBoB::cls(void){                            //clear screen and screen buffers
00049     for(int j = 0; j < 8; j++){
00050         locate(j);
00051         element[j] = 0x0000;
00052         _pca.bus(0x0000);
00053     }
00054     locate(0);
00055 }
00056 
00057 void dispBoB::locate(char pos){
00058     _pca.setAddress(loc[pos]);
00059     _cursor = pos;
00060 }
00061 
00062 int dispBoB::_putc(int c){
00063     if(_cursor>6){
00064         _cursor++;
00065         return -1;                                  //skip if exceeds display size allow extra '.' in 6th >> to place in 5th
00066     }
00067     
00068     if(c=='.'){                                     //choose not to print a '.' outside the display bounds
00069         if(_cursor>6){
00070             _cursor++;
00071             return -1;
00072         }
00073         if((_cursor==0)&&((element[_cursor]&0x1000)==0x1000)) element[_cursor] = 0x0000;  
00074         if(_cursor!=0) _cursor--; 
00075         if(((element[_cursor]&0x1000)==0x1000)||((element[_cursor]&0x0100)==0x0100)){
00076             _cursor++;
00077             element[_cursor]=0x0000;  
00078         }
00079     } else {                                        
00080         if(_cursor>5){                              //for non '.' chars at end of line, flag up overflow and don't print 
00081             _cursor++;
00082             return -1;
00083         }  
00084         element[_cursor]=0x0000;                    //reset an element before pasting a char other than '.'
00085     }
00086    
00087     if(_cursor & 1){                                //look up char >> element conversion and paste to display
00088         element[_cursor] |= dispR[toupper(c)];
00089     } else {
00090         element[_cursor] |= dispL[toupper(c)];
00091     }
00092     
00093     int i = _cursor/2;
00094     ppair[i] = element[(2*i)] + element[(2*i)+1];   //combine left and right elements into a form readable by the PCA9635
00095 
00096     _pca.setAddress(loc[_cursor]);                  //set location to paste to   
00097     bus(ppair[i]);                                  //sned data tp PCA9635
00098     
00099     locate(_cursor+1);                              //allow cursor to be in element[6], decision of what to do
00100                                                     //is made at the start of the putc() algo. depending on char.
00101     return c;
00102 }
00103 
00104 int dispBoB::_getc(){
00105     return -1;
00106 }
00107 
00108 void dispBoB::scroll(string str, float speed){
00109     char buffer[12];                                //instantiate a 12 element buffer array
00110     str.insert(0, nullArray);                       //paste 6 zeros at either end of string 
00111     str.insert(str.length(), nullArray);
00112     
00113     for(int k = 0; k < str.length(); k++){          
00114         str.copy(buffer, 12, k);                    //mask a 12 element buffer starting at k
00115         locate(0);                                  //locate to position 0
00116         printf("%s", buffer);                       //print buffer to display
00117         if((element[0]&0x1000)==0x1000){            //if position zero has two characters i.e. char + '.'
00118             if(element[0]!=0x1000)k++;              //then treat as one
00119             else;
00120         }                                  
00121         wait(speed);                                //hold frame for duration of speed x milliseconds
00122     }
00123 }
00124 
00125 //supply PCA9635 functionality to dispBoB class
00126 void dispBoB::bus(short leds){
00127     _pca.bus(leds);
00128 }
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