IRM2121.cpp

00001 /* mbed Ping Library respected Library !!
00002  *
00003  * make interruptin_mod by bousiya03
00004  * 
00005  */
00006 
00007 
00008 #include "IRM2121.h"
00009 #include "interruptin_mod.h"
00010 #include "mbed.h"
00011 
00012 IRM2121::IRM2121(PinName IRM_PIN)
00013         : _event(IRM_PIN), _timer()
00014 {          
00015 
00016 
00017 } 
00018         
00019 void IRM2121::_Start(void)
00020 {
00021     if(_Valid && _Busy ){
00022         
00023         _timer.start();
00024         _Time  = _timer.read_us();
00025         _Valid = false;  
00026         _Busy  = true; 
00027         _event.fall_disable(this,&IRM2121::_Start);
00028         _event.rise(this,&IRM2121::_Stop);  
00029     }
00030 }
00031 
00032 void IRM2121::_Stop(void)
00033 {
00034     if(!_Valid && _Busy){ 
00035         _Valid = true;  // When it stops, update the time
00036         _Busy  = false;
00037         _Time  = _timer.read_us()-_Time;
00038         _event.rise_disable(this,&IRM2121::_Stop);
00039     }
00040 }
00041 
00042 void IRM2121::Set(void)
00043 {
00044     _timer.reset();
00045     _Valid = true;
00046     _Busy = true;
00047     _event.fall(this,&IRM2121::_Start );
00048     
00049        
00050      
00051 }
00052 
00053 unsigned long IRM2121::Read(void)
00054 // 0 means not valid.
00055 {
00056     if(_Valid && !_Busy){ 
00057         _event.fall_disable(this,&IRM2121::_Start);
00058         _event.rise_disable(this,&IRM2121::_Stop);
00059         return _Time;
00060     }    
00061     
00062     _event.fall_disable(this,&IRM2121::_Start);
00063     _event.rise_disable(this,&IRM2121::_Stop);
00064     
00065     return 0;
00066 }
00067 
00068 
00069 void IRM2121::ReturnVB(bool *valid, bool *busy){
00070     //use after read_function. this is flag checker. 
00071     *valid = _Valid;
00072     *busy  = _Busy;
00073        
00074 }