main.cpp

00001 #include "mbed.h"
00002 #include "TextLCD.h"
00003 
00004 TextLCD mylcd(p24, p26, p27, p28, p29, p30); // rs, e, d4-d7
00005 
00006 volatile int n;
00007 int Raw_data[52];
00008 
00009 DigitalOut REQUEST(p20);
00010 DigitalIn DATA(p9);
00011 InterruptIn CLOCK(p17);
00012 
00013 void trigger() {                    //interrupt  when CLOCK falled 
00014     Raw_data[n] = DATA.read();
00015     n++;
00016 }
00017 
00018 
00019 int main() {
00020     int Y;              
00021     int Measured_Data[6];
00022     int Decimal_point;
00023     double temp_data , Indicate;
00024 
00025  while(1){
00026     wait(0.03);
00027     n=0;
00028 
00029     REQUEST.write(1);
00030     CLOCK.fall(&trigger);
00031 
00032     while(1){
00033         if(n>52) break;         //number of data 
00034     }
00035 
00036     CLOCK.fall(NULL);
00037     REQUEST.write(0);
00038 
00039     Y=20;
00040     for(int i=0;i<=5;i++){          //Raw_data[20]-[43] is Measured_Data
00041         Measured_Data[i] =  Raw_data[Y+3]*pow(2.0,3) + Raw_data[Y+2]*pow(2.0,2) + Raw_data[Y+1]*pow(2.0,1) + Raw_data[Y];
00042         Y=Y+4;
00043     }
00044 
00045     Decimal_point =  Raw_data[Y+3]*pow(2.0,3)+ Raw_data[Y+2]*pow(2.0,2) +Raw_data[Y+1]*pow(2.0,1)+ Raw_data[Y];     ///Raw_data[44]-[47] is Decimal_point
00046    
00047     temp_data  = Measured_Data[0]*100000 + Measured_Data[1]*10000 + Measured_Data[2]*1000 + Measured_Data[3]*100 + Measured_Data[4]*10 + Measured_Data[5];
00048  
00049     if (Raw_data[19]==1)                //19 is Sign. 0 is '+'  ,  1 is '-'
00050         temp_data  = -1* temp_data;
00051 
00052     Indicate = temp_data /pow(10.0,Decimal_point);
00053 
00054     mylcd.cls();
00055     mylcd.printf("%7.2f", Indicate);
00056    
00057     if(Raw_data[48]==0)
00058         mylcd.printf("mm");
00059     else
00060         mylcd.printf("inch");
00061  }
00062 }