GasUseCounter.h

00001 #ifndef __GASUSECOUNTER__H
00002 #define __GASUSECOUNTER__H
00003 #include "mbed.h"
00004 #include "PulsePin.h"
00005 #include "SDFileSystem.h"
00006 #include "Logger.h"
00007 
00008 const int MAX_GAS_COUNT_STR_LEN = 50;
00009 const int MAX_PULSES_BEFORE_STORE_NV = 1; // Store at each pulse
00010 
00011 class GasUseCounter
00012 {
00013     public:
00014         // Constructor
00015         GasUseCounter(const char* gasUseFilename1, const char* gasUseFilename2, DigitalIn& gasPulsePin, Logger &logger, Mutex &sdCardMutex) :
00016                 _gasPulsePin(gasPulsePin), _logger(logger), _sdCardMutex(sdCardMutex)
00017         {
00018             _gasUseFilename1 = gasUseFilename1;
00019             _gasUseFilename2 = gasUseFilename2;
00020             _lastWrittenGasCount = 0;
00021             _pulseDetector = new PulsePin(_gasPulsePin, false, 200);
00022         }
00023         
00024         // Init (get count from NV)
00025         void Init();
00026         
00027         // Callback from web server to handle getting current gas count
00028         char* getGasUseCallback(char* cmdStr, char* argStr);
00029 
00030         // Service function to detect pulses
00031         bool Service();
00032         
00033         // Read/Write current gas count
00034         void GetGasCountFromSD();
00035         void WriteGasCountToSD();
00036         
00037         // Get Count
00038         int GetCount()
00039         {
00040             return _pulseDetector->GetPulseCount();
00041         }
00042         
00043         // Set Count
00044         void SetCount(int gasUseCount)
00045         {
00046             _pulseDetector->SetPulseCount(gasUseCount);
00047             WriteGasCountToSD();
00048         }
00049         
00050         // Get inter-pulse time
00051         int GetPulseRateMs()
00052         {
00053             return _pulseDetector->GetPulseRateMs();
00054         }
00055         
00056     private:
00057         // Gas use filename for non-volatile
00058         const char* _gasUseFilename1;
00059         const char* _gasUseFilename2;
00060         int _curGasCount;
00061         int _lastWrittenGasCount;
00062         char _gasCountStr [MAX_GAS_COUNT_STR_LEN];
00063         DigitalIn& _gasPulsePin;
00064         PulsePin* _pulseDetector;
00065         Logger &_logger;
00066         Mutex &_sdCardMutex;
00067 };
00068 
00069 
00070 
00071 
00072 #endif