DetectFreqAboveTH.h

00001 #pragma once
00002 
00003 /** Detected Iteration Above Threshold in Unit Time.
00004  *  Check if Frequency (iteration count in Unit time) above Threshold.
00005  *
00006  *  CATION. max interval is 0xfff0: 65,520ms.
00007  *          max iter threshold is 0xffff.
00008  *              (threfore, using 131KB with span[0xffff].)
00009  */
00010 /** Sample code
00011 #include "mbed.h"
00012 #include "DetectFreqAboveTH.h"
00013 
00014 DigitalOut led1(LED1);
00015 DigitalOut led4(LED4);
00016 
00017 DetectFreqAboveTH chkErrIter(5000, 100);
00018 
00019 int main()
00020 {
00021    while(1) {
00022        led1= !led1;
00023        if(chkErrIter.chkAbove()) {
00024            led4= !led4;
00025            wait_ms(5100);
00026        }
00027        wait_ms(20);
00028    }
00029 }
00030 */
00031 
00032 #include "mbed.h"
00033 #include "myTimer.h"
00034 
00035 class DetectFreqAboveTH
00036 {
00037 public:
00038     DetectFreqAboveTH(int time_ms, int iter);
00039     ~DetectFreqAboveTH();
00040 
00041     bool chkAbove();
00042 
00043 private:
00044     unsigned short id, iterThreshold, *span;   // circular buffer
00045     unsigned int unitTime;
00046 // 16bit: 0xFFFF
00047 
00048     myTimer timer;
00049 };