SdHandler.h

00001 #ifndef __SD_HANDLER_H__
00002 #define __SD_HANDLER_H__
00003 
00004 #include "SDFileSystem.h"
00005 #include "AbstractHandler.h"
00006 
00007 class CircBuff;
00008 
00009 /*!
00010  * \brief The SdHandler class writes messages to file and handles SD card status
00011  * 
00012  * A data CSV file is written with timestamps and the result from the GroveDht22.
00013  * A system log, not yet fully implemented, tracks system events for debugging purposes.
00014  */
00015 class SdHandler : public AbstractHandler
00016 {
00017 public:
00018     SdHandler(MyTimers * _timer);
00019     ~SdHandler();
00020 
00021     void run();
00022 
00023     void setRequest(int request, void *data = 0);
00024 
00025     bool sdOk();
00026 
00027     enum request_t  {
00028         sdreq_SdNone,       ///< to init
00029         sdreq_LogData,      ///< Send struct containing a result and timestamp. This turns it into a line in a csv file
00030         sdreq_LogSystem     ///< write raw string to system logging file (errors, events, etc)
00031     };
00032 
00033 private:
00034     SDFileSystem * m_sdfs;
00035     FILE * m_data;
00036     FILE * m_syslog;
00037 
00038     enum mode_t{
00039         sd_Start,                   ///< Set up the state machine
00040         sd_CheckSysLogBuffer,       ///< See if any data should be written to the log file
00041         sd_CheckDataLogBuffer,      ///< See if any data should be written to the data file
00042 
00043         sd_WaitError                ///< Error. wait for a while
00044     };
00045     mode_t mode;
00046 
00047     request_t  m_lastRequest;
00048     
00049     // helpers
00050     void csvStart(time_t time);
00051     void csvData(const char * s, int len);
00052     void csvEnd();
00053     void logEvent(const char * s);
00054     
00055     CircBuff *m_dataLogBuff;        ///< Data waiting to be written to the data CSV file
00056     CircBuff *m_sysLogBuff;         ///< Data waiting to be written to the system log file (not yet implemented)
00057 };
00058 
00059 #endif // __SD_HANDLER_H__