Tetsuro Tatsuoka
/
BH1792GLC_Eval
Measuring plethysmogram with BH1792GLC (Rohm Semiconductor) and calculating pulse rate
PulseRate.h@0:18d735a66926, 2018-02-05 (annotated)
- Committer:
- t_tatsuoka
- Date:
- Mon Feb 05 20:22:14 2018 +0000
- Revision:
- 0:18d735a66926
- Child:
- 1:90f70c146a26
Ver. 1.0.0 ??
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
t_tatsuoka | 0:18d735a66926 | 1 | /** |
t_tatsuoka | 0:18d735a66926 | 2 | * @file PulseRate.h |
t_tatsuoka | 0:18d735a66926 | 3 | * @brief Header file for PulseRate.cpp |
t_tatsuoka | 0:18d735a66926 | 4 | * @date 2018.02.03 |
t_tatsuoka | 0:18d735a66926 | 5 | * @version 1.1.0 |
t_tatsuoka | 0:18d735a66926 | 6 | */ |
t_tatsuoka | 0:18d735a66926 | 7 | #ifndef _INC_PulseRate |
t_tatsuoka | 0:18d735a66926 | 8 | #define _INC_PulseRate |
t_tatsuoka | 0:18d735a66926 | 9 | |
t_tatsuoka | 0:18d735a66926 | 10 | // #define _OP_MODE_INT_AD /* When using internal ADC */ |
t_tatsuoka | 0:18d735a66926 | 11 | #define _OP_MODE_BH1792GLC /* When using BH1792GLC sensor */ |
t_tatsuoka | 0:18d735a66926 | 12 | |
t_tatsuoka | 0:18d735a66926 | 13 | #include "mbed.h" |
t_tatsuoka | 0:18d735a66926 | 14 | #ifdef _OP_MODE_BH1792GLC |
t_tatsuoka | 0:18d735a66926 | 15 | #include "Bh1792glcCtrl.h" |
t_tatsuoka | 0:18d735a66926 | 16 | #endif |
t_tatsuoka | 0:18d735a66926 | 17 | |
t_tatsuoka | 0:18d735a66926 | 18 | #define LED_ON (0) |
t_tatsuoka | 0:18d735a66926 | 19 | #define LED_OFF (1) |
t_tatsuoka | 0:18d735a66926 | 20 | |
t_tatsuoka | 0:18d735a66926 | 21 | #define BEEP_FREQ (1000.0) |
t_tatsuoka | 0:18d735a66926 | 22 | #define BEEP_LOUD (0.5) |
t_tatsuoka | 0:18d735a66926 | 23 | |
t_tatsuoka | 0:18d735a66926 | 24 | #define SAMPLING_RATE (0.01) /* A/D sampling rate (10ms) */ |
t_tatsuoka | 0:18d735a66926 | 25 | #define SPL_NUM (100) /* Range of sampling number (0 - 99) */ |
t_tatsuoka | 0:18d735a66926 | 26 | |
t_tatsuoka | 0:18d735a66926 | 27 | #define AD_OFFSET (21845) /* Offset value for VREF (about +1.1V) */ |
t_tatsuoka | 0:18d735a66926 | 28 | |
t_tatsuoka | 0:18d735a66926 | 29 | #define COEF_BH (0x3FCCB062) /* High pass filter b0, -b1 coefficient 0.1Hz/100Hz Q30 format */ |
t_tatsuoka | 0:18d735a66926 | 30 | /* Use (0x3F02946A) when 0.5Hz/100Hz Q30 format */ |
t_tatsuoka | 0:18d735a66926 | 31 | #define COEF_AH (0x3F9960C5) /* High pass filter -a1 coefficient 0.1Hz/200Hz Q30 format */ |
t_tatsuoka | 0:18d735a66926 | 32 | /* Use (0x3E0528D5) when 0.5Hz/100Hz Q30 format */ |
t_tatsuoka | 0:18d735a66926 | 33 | |
t_tatsuoka | 0:18d735a66926 | 34 | #define MV_LENGTH (5) /* Number of moving averaging for pulse detection */ |
t_tatsuoka | 0:18d735a66926 | 35 | #define TH_COEF (0.993) /* Coefficient for pulse threshold (exponential decline) */ |
t_tatsuoka | 0:18d735a66926 | 36 | #define PEAK_MIN (127) /* Ignore waveform as pulse under this value */ |
t_tatsuoka | 0:18d735a66926 | 37 | |
t_tatsuoka | 0:18d735a66926 | 38 | #define PR_LENGTH (5) /* Number of average for pulse rate */ |
t_tatsuoka | 0:18d735a66926 | 39 | #define PR_1MIN_SPL (6000) /* Number of sampling for 1 minute (60*100) */ |
t_tatsuoka | 0:18d735a66926 | 40 | #define PR_INT_MAX (300) /* 20 bpm (60*100/20) */ |
t_tatsuoka | 0:18d735a66926 | 41 | #define PR_INT_MIN (20) /* 300 bpm (60*100/300) */ |
t_tatsuoka | 0:18d735a66926 | 42 | |
t_tatsuoka | 0:18d735a66926 | 43 | /** Calculate pulse waveform and pulse rate |
t_tatsuoka | 0:18d735a66926 | 44 | */ |
t_tatsuoka | 0:18d735a66926 | 45 | class PulseRate |
t_tatsuoka | 0:18d735a66926 | 46 | { |
t_tatsuoka | 0:18d735a66926 | 47 | |
t_tatsuoka | 0:18d735a66926 | 48 | public: |
t_tatsuoka | 0:18d735a66926 | 49 | #ifdef _OP_MODE_INT_AD |
t_tatsuoka | 0:18d735a66926 | 50 | PulseRate(PinName sensor, PinName sync_led, PinName beep); |
t_tatsuoka | 0:18d735a66926 | 51 | #elif defined _OP_MODE_BH1792GLC |
t_tatsuoka | 0:18d735a66926 | 52 | PulseRate(PinName bh_sda, PinName bh_scl, PinName bh_int, PinName sync_led, PinName beep); |
t_tatsuoka | 0:18d735a66926 | 53 | #endif |
t_tatsuoka | 0:18d735a66926 | 54 | void start_sampling(); |
t_tatsuoka | 0:18d735a66926 | 55 | bool get_wave(uint32_t &num, int32_t &wave_val); |
t_tatsuoka | 0:18d735a66926 | 56 | bool get_pr_val(uint32_t &pr); |
t_tatsuoka | 0:18d735a66926 | 57 | |
t_tatsuoka | 0:18d735a66926 | 58 | private: |
t_tatsuoka | 0:18d735a66926 | 59 | Ticker _sampling; /* Interval timer for data sampling */ |
t_tatsuoka | 0:18d735a66926 | 60 | |
t_tatsuoka | 0:18d735a66926 | 61 | #ifdef _OP_MODE_INT_AD |
t_tatsuoka | 0:18d735a66926 | 62 | AnalogIn _sensor; /* A/D converter */ |
t_tatsuoka | 0:18d735a66926 | 63 | #elif defined _OP_MODE_BH1792GLC |
t_tatsuoka | 0:18d735a66926 | 64 | Bh1792glcCtrl _bh; /* BH1792GLC Control */ |
t_tatsuoka | 0:18d735a66926 | 65 | #endif |
t_tatsuoka | 0:18d735a66926 | 66 | DigitalOut _sync_led; /* Synchronous LED */ |
t_tatsuoka | 0:18d735a66926 | 67 | PwmOut _beep; /* Piezo sounder */ |
t_tatsuoka | 0:18d735a66926 | 68 | |
t_tatsuoka | 0:18d735a66926 | 69 | /* Pulse waveform */ |
t_tatsuoka | 0:18d735a66926 | 70 | int32_t _val; /* Pulse waveform value */ |
t_tatsuoka | 0:18d735a66926 | 71 | int32_t _prev_val; /* Previous value */ |
t_tatsuoka | 0:18d735a66926 | 72 | int32_t _reg_hpf; /* High pass filter memory value */ |
t_tatsuoka | 0:18d735a66926 | 73 | bool _wave_flag; /* Pulse waveform set flag */ |
t_tatsuoka | 0:18d735a66926 | 74 | |
t_tatsuoka | 0:18d735a66926 | 75 | uint32_t _sampling_num; /* Sampling number */ |
t_tatsuoka | 0:18d735a66926 | 76 | |
t_tatsuoka | 0:18d735a66926 | 77 | /* Moving averaging */ |
t_tatsuoka | 0:18d735a66926 | 78 | int32_t _mv_buf[MV_LENGTH]; /* Circular buffer */ |
t_tatsuoka | 0:18d735a66926 | 79 | int32_t _mv_idx; /* Buffer index */ |
t_tatsuoka | 0:18d735a66926 | 80 | |
t_tatsuoka | 0:18d735a66926 | 81 | /* Threshold for detecting pulse */ |
t_tatsuoka | 0:18d735a66926 | 82 | int32_t _detect_val; /* Detection value */ |
t_tatsuoka | 0:18d735a66926 | 83 | int32_t _prev_dt_val; /* Previous data */ |
t_tatsuoka | 0:18d735a66926 | 84 | |
t_tatsuoka | 0:18d735a66926 | 85 | int32_t _threshold_val; /* Threshold value */ |
t_tatsuoka | 0:18d735a66926 | 86 | int32_t _prev_th_val; /* Previous data */ |
t_tatsuoka | 0:18d735a66926 | 87 | |
t_tatsuoka | 0:18d735a66926 | 88 | /* Pulse rate */ |
t_tatsuoka | 0:18d735a66926 | 89 | int32_t _pr_counter; /* Counter for pulse rate */ |
t_tatsuoka | 0:18d735a66926 | 90 | int32_t _pr_buf[PR_LENGTH]; /* Circular buffer */ |
t_tatsuoka | 0:18d735a66926 | 91 | int32_t _pr_idx; /* Buffer index */ |
t_tatsuoka | 0:18d735a66926 | 92 | |
t_tatsuoka | 0:18d735a66926 | 93 | int32_t _pr; /* Pulse rate value */ |
t_tatsuoka | 0:18d735a66926 | 94 | bool _pr_flag; /* Pulse rate set flag */ |
t_tatsuoka | 0:18d735a66926 | 95 | |
t_tatsuoka | 0:18d735a66926 | 96 | /* Member functions */ |
t_tatsuoka | 0:18d735a66926 | 97 | void init(); |
t_tatsuoka | 0:18d735a66926 | 98 | void interval_timer(); |
t_tatsuoka | 0:18d735a66926 | 99 | int32_t hpf(int32_t val); |
t_tatsuoka | 0:18d735a66926 | 100 | bool detect_peak(int32_t val); |
t_tatsuoka | 0:18d735a66926 | 101 | void calc_pr(); |
t_tatsuoka | 0:18d735a66926 | 102 | }; |
t_tatsuoka | 0:18d735a66926 | 103 | #endif /* INC_PulseRate */ |