IMD.h

00001 // copied idea from http://developer.mbed.org/forum/mbed/topic/466/?page=1#comment-2457
00002 
00003 #ifndef _FILE_IMD_H
00004 #define _FILE_IMD_H  
00005 
00006 #include "mbed.h"
00007 
00008 enum IMDstatus  {
00009     OFF         = 1<<0,
00010     NORMAL      = 1<<1,
00011     UNDERVOLT   = 1<<2,
00012     SPEEDSTART  = 1<<3,
00013     ERROR       = 1<<4,
00014     GROUNDERR   = 1<<5,
00015     INVALID     = 1<<6,  
00016 };
00017 
00018 class IMD{
00019 public:
00020     IMD(PinName _pin);
00021     
00022     char status();
00023     // Gets the insulation resistance reading
00024     // Returns 0 to 50,000,000 in normal/UV modes
00025     // Returns 0 or 50,000,000 in speed start (good/bad only)
00026     // Nan for invalid measurement (out of permissible range)
00027     // Nan for not avail. in this mode
00028     float resistance();
00029     
00030     // Interrupt function for the edge type detected
00031     void edgeIRQ();
00032     // Used to zero (reset) the data on timeout
00033     void zeroIRQ();
00034     
00035 private:
00036     float frequency();
00037     float duty();
00038     
00039     volatile uint32_t startTime;
00040     volatile uint32_t widthTicks;
00041     volatile uint32_t periodTicks;
00042     volatile bool first;
00043     
00044     LPC_TIM_TypeDef *timerBase;    // Base address of the active timer module
00045     int pin;                       // Capture pin#, 0 or 1
00046     int timer;
00047 };
00048 
00049 #endif