PMS.h

00001 #ifndef PMS_H
00002 #define PMS_H
00003 
00004 #include "mbed.h"
00005 #define DUST_BUFFER 64
00006 class PMS
00007 {
00008 public:
00009   static const uint16_t SINGLE_RESPONSE_TIME = 1000;
00010   static const uint16_t TOTAL_RESPONSE_TIME = 1000 * 10;
00011   static const uint16_t STEADY_RESPONSE_TIME = 1000 * 30;
00012 
00013   static const uint16_t BAUD_RATE = 9600;
00014 
00015   struct DATA {
00016     // Standard Particles, CF=1
00017     uint16_t PM_SP_UG_1_0;
00018     uint16_t PM_SP_UG_2_5;
00019     uint16_t PM_SP_UG_10_0;
00020 
00021     // Atmospheric environment
00022     uint16_t PM_AE_UG_1_0;
00023     uint16_t PM_AE_UG_2_5;
00024     uint16_t PM_AE_UG_10_0;
00025   };
00026 
00027   PMS(RawSerial&);
00028   PMS(PinName tx, PinName rx);
00029   ~PMS() { 
00030     delete _stream;
00031     delete _data; 
00032   }
00033   void begin(DATA&);
00034   void activeMode();
00035   void passiveMode();
00036   void requestRead();
00037   bool available();
00038 private:
00039   enum STATUS { STATUS_WAITING, STATUS_OK };
00040   enum MODE { MODE_ACTIVE, MODE_PASSIVE };
00041 
00042   uint8_t _payload[12];
00043   RawSerial* _stream;
00044   Timer _tmr;
00045   DATA* _data;
00046   volatile STATUS _status;
00047   MODE _mode = MODE_PASSIVE;
00048   volatile char buf[DUST_BUFFER];
00049   uint8_t _index = 0;
00050   uint16_t _frameLen;
00051   uint16_t _checksum;
00052   uint16_t _calculatedChecksum;
00053 
00054   uint16_t makeWord(uint8_t high, uint8_t low);
00055 
00056   void RxInterrupt();
00057   void Caculate();
00058 };
00059 
00060 #endif