edge_pressure.h

00001 #ifndef _EDGE_PRESSURE_H_
00002 #define _EDGE_PRESSURE_H_
00003 #include "mbed.h"
00004 #include "edge_sensor.h"
00005 #include "PSE530.h"
00006 
00007 /**
00008  * edge_pressure edge_sensor for measuring gas presssure
00009  */
00010 
00011 class edge_pressure : public edge_sensor {
00012 public:
00013 /**
00014  * constructor 
00015  * @param *pse PSE530 pressure sensor object
00016  */
00017     edge_pressure(PSE530 *pse, DigitalOut *en) ;
00018 
00019 /**
00020  * destructor
00021  */
00022     ~edge_pressure(void) ;
00023     
00024 /**
00025  * reset and clear internal values
00026  */
00027     virtual void    reset(void) ;
00028 
00029 /**
00030  * prepare for sampling (not used)
00031  */
00032     virtual void    prepare(void) ;
00033     
00034 /**
00035  * sample the value
00036  * @returns 0: success non-0: failure
00037  */
00038     virtual int    sample(void) ;
00039 
00040 /**
00041  * deliver the sampled value to afero cloud
00042  */
00043     virtual int     deliver(void) ;
00044     
00045 /**
00046  * show the value in the display (TFT)
00047  */
00048     virtual void    show(void) ;
00049 //    virtual void    send_config(void) ; /* send config data to cloud */
00050 //    virtual void    recv_config(void) ; /* receive config data from cloud */
00051 
00052 /**
00053  * get_value sample sensor value and calcurate it to the metric value
00054  * @returns measured value in kgf/cm2
00055  */
00056     float get_value(void) ;
00057 
00058 /**
00059  * Set threshold mode
00060  * @param mode int 0: absolute value 1: relative value in percent
00061  */
00062     void  set_thr_mode(int mode)    { _thr_mode = mode ; }
00063 
00064 /**
00065  * Get threshold mode
00066  * @returns the mode 0: absolute value 1: relative value in percent
00067  */
00068     int   get_thr_mode(void)        { return _thr_mode ; }
00069     
00070 /**
00071  * Set higher threshold
00072  * @param thr_high int16_t the higher threshold
00073  */
00074     void  set_thr_high(int16_t thr_high) ;
00075     
00076 /**
00077  * Get higher threshold, the value is calcurated with expected value
00078  * @param expected float the expected pressure value for current temperature
00079  */
00080     float get_thr_high(float expected) ;
00081     
00082 /**
00083  * Set lower threshold
00084  * @param thr_low int16_t the lower threshold
00085  */
00086     void  set_thr_low(int16_t thr_low) ;
00087     
00088 /**
00089  * Get lower threshold, the value is calcurated with expected value
00090  * @param expected float the expected pressure value for current temperature
00091  */
00092     float get_thr_low(float expected)  ;
00093     
00094 private:
00095     PSE530  *_pse ;
00096     DigitalOut *_en ;
00097     float   _value ;
00098     float   _thr_high ;
00099     float   _thr_low ;
00100     int     _thr_mode ;
00101     float   _expected ;
00102     float   _higher ;
00103     float   _lower ;
00104 } ;
00105 
00106 float temp2expected(float temp) ;
00107 extern float *current_temp ;
00108 
00109 #endif /* _EDGE_PRESSURE_H_ */