Display.cpp

00001 #include "Display.h"
00002 extern int timer; //Stores timer mode
00003 extern int Time;  //time in 10mS
00004 
00005                   //A    B    C    d    E    F    g    H    I    J    K    L    M    N    O    P    q    r    S    t    U    V    W    X    y    Z
00006 int ImageTable[26]={0x77,0x1F,0x4E,0x3D,0x4F,0x47,0x7B,0x37,0x30,0x3C,0x37,0x0E,0x00,0x76,0x7E,0x67,0x73,0x46,0x5B,0x0F,0x3E,0x3E,0x00,0x37,0x3B,0x6D};
00007 
00008 DigitalOut CS           (D2);
00009 SPI Display( PTD2,PTD3,PTD1);
00010     
00011 void DisplayInit(void){
00012     CS =1;                     //Disable chip select
00013     Display.format(16,3);      //16-bit, mode 3
00014     Display.frequency(1000000);//1MHz clock speed
00015     SendData(0x01, ShutDown ); //Normal Operation
00016     SendData(0x0F, Intensity); //Brightness set to full
00017     SendData(0x04, ScanLimit); //Scanning digits 1-5
00018     DisplayBCD(1);             //BCD decoder active on all digits
00019 }
00020 
00021 void SendData(int data, int address){
00022     
00023     CS=0;               //Enable input
00024     data|=(address<<8); //Data format: XXXXAAAADDDDDDDD, X=dont care. A=address. D=data
00025     Display.write(data);//Send SPI data
00026     CS=1;               //Disable input
00027     
00028 }
00029 
00030 void DisplayClear(void){//Only use when not in BCD mode.
00031     
00032     SendData(0x00,1);   //Send nothing to all the digits.
00033     SendData(0x00,2);
00034     SendData(0x00,3);
00035     SendData(0x00,4);
00036     SendData(0x00,5);
00037     
00038 }
00039 
00040 void DisplayBCD(int state){//1 to turn on, 0 to turn off.
00041     if(state){
00042         SendData(0xFF, BCD_Mode); 
00043     }else{
00044         SendData(0x00, BCD_Mode); 
00045     }
00046 }
00047 
00048 void DisplayUpdate(void){
00049 
00050     if      (timer==Start){ //If timer is in start mode, increment the time
00051         Time++;
00052     }else if(timer==Reset){ //If timer is on reset mode, time = 0
00053         Time=0;
00054     }
00055     
00056     if(timer!=Disable){           //Display the time on the 7-segment display, if enabled.
00057         DisplayBCD(1);
00058         SendData(DPoint| (Time/6000)      , 5);
00059         SendData(       ((Time%6000)/1000), 4);
00060         SendData(DPoint|((Time%1000)/100) , 1);
00061         SendData(       ((Time%100 )/10)  , 2);
00062         SendData(       ((Time%10  )  )   , 3);
00063     }
00064 }
00065 
00066 void DisplayScroll(char data[40]){//Lower case only
00067     int ScreenText[50]; //Segment data for screen
00068     int n,length;
00069     
00070     for(n=0;n<50;n++){  //clear array
00071         ScreenText[n]=0;
00072     }
00073     
00074     n=0;
00075     while(n<40 && (data[n]!='\0')){                 //keep looping untill the end of the string, max 20
00076         if(data[n]>96 && data[n]<123){              //check for valid characters
00077             ScreenText[n+5]=ImageTable[data[n]-97]; //use a look-up table to convert ASCII to segment data
00078         }
00079         n++;    
00080     }
00081     
00082     timer=Disable;
00083     DisplayBCD(0);  //turn off decoders
00084     
00085     length=n;
00086     for(n=0;n<(length+6);n++){  //display data
00087         SendData(ScreenText[n  ], 5);
00088         SendData(ScreenText[n+1], 4);
00089         SendData(ScreenText[n+2], 1);
00090         SendData(ScreenText[n+3], 2);
00091         SendData(ScreenText[n+4], 3);
00092         wait(0.3);
00093     }  
00094 }
00095 
00096 void DisplayNumber(char n1,char n2,char n3,char n4,char n5){
00097     
00098     timer=Disable;
00099     DisplayBCD(1);  //turn off decoders
00100 
00101     SendData(n1, 5);
00102     SendData(n2, 4);
00103     SendData(n3, 1);
00104     SendData(n4, 2);
00105     SendData(n5, 3);
00106 }