main.cpp

00001 /* Program Example 6.1: seven-segment display counter 
00002                                                               */
00003 #include "mbed.h" 
00004 
00005 BusOut Seg1(p5,p6,p7,p8,p9,p10,p11,p12); // A,B,C,D,E,F,G,DP
00006 char SegConvert(char SegValue);          // function prototype
00007 char A=0;                               // declare variables A and B
00008 char B;
00009 
00010 int main() {                            // main program
00011   while (1) {                           // infinite loop
00012     B=SegConvert(A);                    // Call function to return B
00013     Seg1=B;                             // Output B
00014     A++;                                // increment A
00015     if (A>0x09){                        // if A > 9 reset to zero
00016           A=0;
00017        }
00018     wait(0.5);                          // delay 500 milliseconds
00019   }
00020 }
00021 
00022 char SegConvert(char SegValue) {        // function 'SegConvert'
00023   char SegByte=0x00;
00024   switch (SegValue) {                   //DP G F E D C B A
00025     case 0 : SegByte = 0x3F;break;      // 0 0 1 1 1 1 1 1 binary
00026     case 1 : SegByte = 0x06;break;      // 0 0 0 0 0 1 1 0 binary
00027     case 2 : SegByte = 0x5B;break;      // 0 1 0 1 1 0 1 1 binary
00028     case 3 : SegByte = 0x4F;break;      // 0 1 0 0 1 1 1 1 binary
00029     case 4 : SegByte = 0x66;break;      // 0 1 1 0 0 1 1 0 binary
00030     case 5 : SegByte = 0x6D;break;      // 0 1 1 0 1 1 0 1 binary
00031     case 6 : SegByte = 0x7D;break;      // 0 1 1 1 1 1 0 1 binary
00032     case 7 : SegByte = 0x07;break;      // 0 0 0 0 0 1 1 1 binary
00033     case 8 : SegByte = 0x7F;break;      // 0 1 1 1 1 1 1 1 binary
00034     case 9 : SegByte = 0x6F;break;      // 0 1 1 0 1 1 1 1 binary
00035   }
00036     return SegByte;
00037 }
00038