main.cpp

00001 #include "mbed.h"
00002 #include "FastAnalogIn.h"
00003 
00004 /*
00005 Simple program which uses a ticker object to record and analoge value and store it in a cicular buffer.
00006 The ticker delay sets the sampling rate. 
00007 
00008 The FastAnalogIn Library is used (http://mbed.org/users/Sissors/code/FastAnalogIn/) to rapidly sample 
00009 a single channel. 
00010 
00011 In the main loop a busy loop is used to send read the data from the cicular buffer and send down the serial line
00012 
00013 
00014 */
00015 
00016 //size of cicular buffer
00017 #define BuffSize 255
00018 
00019 using namespace mbed;
00020 
00021 FastAnalogIn Ain(PTC2);
00022 
00023 Serial pc(USBTX, USBRX);
00024 Timer t;
00025 Ticker tock;
00026 
00027 //set the delay used by the ticker
00028 float delay = 0.01;
00029 
00030 //some circular buffers
00031 
00032 float data[BuffSize];
00033 float time_[BuffSize];
00034 long i =0;
00035 int j=0;
00036 long k =0;
00037  
00038 void ana()
00039 {
00040    if(i<k+BuffSize)
00041     {j = i%BuffSize;
00042     //time_[j]=t.read();
00043     data[j]=Ain.read();
00044     time_[j]=t.read();
00045     i++;
00046     }
00047 }
00048 
00049 
00050 int main()
00051 {
00052     pc.baud(57600);
00053     t.start();
00054     tock.attach(&ana,delay); 
00055     while (true) {        
00056        if(k<i)
00057         {
00058         pc.printf("%f,%f\n",time_[k%BuffSize],data[k%BuffSize]);
00059         k++;
00060         }
00061         
00062   
00063     }
00064 }