main.cpp

00001 #include "mbed.h"
00002 
00003 //Pin connected to Data in (DS) of 74HC595
00004 DigitalOut dataPin(dp9);
00005 //Pin connected to latch pin (ST_CP) of 74HC595
00006 DigitalOut latchPin(dp10);
00007 //Pin connected to clock pin (SH_CP) of 74HC595
00008 DigitalOut clockPin(dp11);
00009 
00010 uint8_t Tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
00011 
00012 void shiftOut(DigitalOut data, DigitalOut clk, int sdata) {
00013     for (int i = 7; i >= 0; i--) {
00014         clk = 0;
00015         if(sdata & (1 << i)){
00016             data = 1;
00017         } else {
00018             data = 0;
00019         }
00020         clk = 1;
00021         data = 0;
00022     }
00023 }
00024 
00025 void leddisp(long n){
00026     char disp[9];
00027     
00028     sprintf(disp, "%08d¥n", n);
00029     
00030     for (int c = 8; c >= 0 ;c--){
00031         // write to the shift register with the correct bit set high:
00032         latchPin = 0;
00033         // shift the bits out:
00034         shiftOut(dataPin, clockPin, Tab[disp[c] - 48]);
00035         // turn on the output so the LEDs can light up:
00036         latchPin = 1;
00037     }
00038 }
00039 
00040 int main() {
00041     long number = 0;
00042     while(1) {
00043         leddisp(number++);
00044         if (number > 99999999) {
00045             number = 0;
00046         }
00047         wait(0.1);
00048     }
00049 }