Diff: PulseRate.h

Revision:

0:18d735a66926

Child:

1:90f70c146a26

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PulseRate.h	Mon Feb 05 20:22:14 2018 +0000
@@ -0,0 +1,103 @@
+/**
+ *  @file       PulseRate.h
+ *  @brief      Header file for PulseRate.cpp
+ *  @date       2018.02.03
+ *  @version    1.1.0
+ */
+#ifndef _INC_PulseRate
+#define _INC_PulseRate
+
+// #define _OP_MODE_INT_AD         /* When using internal ADC */
+#define _OP_MODE_BH1792GLC      /* When using BH1792GLC sensor */
+
+#include "mbed.h"
+#ifdef _OP_MODE_BH1792GLC
+#include "Bh1792glcCtrl.h"
+#endif
+
+#define LED_ON  (0)
+#define LED_OFF (1)
+
+#define BEEP_FREQ (1000.0)
+#define BEEP_LOUD (0.5)
+
+#define SAMPLING_RATE (0.01)    /* A/D sampling rate (10ms) */
+#define SPL_NUM (100)           /* Range of sampling number (0 - 99) */
+
+#define AD_OFFSET (21845)       /* Offset value for VREF (about +1.1V) */
+
+#define COEF_BH (0x3FCCB062)    /* High pass filter b0, -b1 coefficient 0.1Hz/100Hz Q30 format */
+/* Use (0x3F02946A) when 0.5Hz/100Hz Q30 format */
+#define COEF_AH (0x3F9960C5)    /* High pass filter -a1     coefficient 0.1Hz/200Hz Q30 format */
+/* Use (0x3E0528D5) when 0.5Hz/100Hz Q30 format */
+
+#define MV_LENGTH (5)           /* Number of moving averaging for pulse detection */
+#define TH_COEF (0.993)         /* Coefficient for pulse threshold (exponential decline) */
+#define PEAK_MIN (127)          /* Ignore waveform as pulse under this value */
+
+#define PR_LENGTH (5)           /* Number of average for pulse rate */
+#define PR_1MIN_SPL (6000)      /* Number of sampling for 1 minute (60*100) */
+#define PR_INT_MAX (300)        /* 20 bpm (60*100/20) */
+#define PR_INT_MIN (20)         /* 300 bpm (60*100/300) */
+
+/** Calculate pulse waveform and pulse rate
+ */
+class PulseRate
+{
+
+public:
+#ifdef _OP_MODE_INT_AD
+    PulseRate(PinName sensor, PinName sync_led, PinName beep);
+#elif defined _OP_MODE_BH1792GLC
+    PulseRate(PinName bh_sda, PinName bh_scl, PinName bh_int, PinName sync_led, PinName beep);
+#endif
+    void start_sampling();
+    bool get_wave(uint32_t &num, int32_t &wave_val);
+    bool get_pr_val(uint32_t &pr);
+
+private:
+    Ticker      _sampling;          /* Interval timer for data sampling */
+
+#ifdef _OP_MODE_INT_AD
+    AnalogIn    _sensor;            /* A/D converter */
+#elif defined _OP_MODE_BH1792GLC
+    Bh1792glcCtrl  _bh;             /* BH1792GLC Control */
+#endif
+    DigitalOut  _sync_led;          /* Synchronous LED */
+    PwmOut      _beep;              /* Piezo sounder */
+
+    /* Pulse waveform */
+    int32_t     _val;               /* Pulse waveform value */
+    int32_t     _prev_val;          /* Previous value */
+    int32_t     _reg_hpf;           /* High pass filter memory value */
+    bool        _wave_flag;         /* Pulse waveform set flag */
+
+    uint32_t    _sampling_num;      /* Sampling number */
+
+    /* Moving averaging */
+    int32_t     _mv_buf[MV_LENGTH]; /* Circular buffer */
+    int32_t     _mv_idx;            /* Buffer index */
+
+    /* Threshold for detecting pulse */
+    int32_t     _detect_val;        /* Detection value */
+    int32_t     _prev_dt_val;       /* Previous data */
+
+    int32_t     _threshold_val;     /* Threshold value */
+    int32_t     _prev_th_val;       /* Previous data */
+
+    /* Pulse rate */
+    int32_t     _pr_counter;        /* Counter for pulse rate */
+    int32_t     _pr_buf[PR_LENGTH]; /* Circular buffer */
+    int32_t     _pr_idx;            /* Buffer index */
+
+    int32_t     _pr;                /* Pulse rate value */
+    bool        _pr_flag;           /* Pulse rate set flag */
+
+    /* Member functions */
+    void init();
+    void interval_timer();
+    int32_t hpf(int32_t val);
+    bool detect_peak(int32_t val);
+    void calc_pr();
+};
+#endif    /* INC_PulseRate */