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add examples
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/*******************************************************************************
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HRM.h - Definition header
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*******************************************************************************/
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#ifndef HRM_H
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#define HRM_H
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#include <stdint.h>
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//------------------------------------------------------
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#define HR_SAMPLE_RATE 25// Hz
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#define HR_INTEG_MIN HR_INTEG_40
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#define HR_INTEG_BASE HR_INTEG_250
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#define HR_INTEG_MAX HR_INTEG_250
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#define HR_TH_HIGH 63000
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#define HR_TH_LOW 30000
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//------------------------------------------------------
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// HRM I2C address & register sub-addresses
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#define HR_SLAVE_ADDRESS 0x82
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#define HR_FILTER_1 0<<5
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#define HR_FILTER_2 1<<5
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#define HR_FILTER_4 2<<5
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#define HR_FILTER_8 3<<5
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#define HR_FILTER_16 4<<5
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#define HR_FILTER_32 5<<5
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#define HR_FILTER_64 6<<5
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#define HR_FILTER_128 7<<5
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#define HR_MODE_HR 1<<4
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#define HR_MODE_HRS 9<<4
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#define HR_GAIN_MID 1
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#define HR_GAIN_LOW 3
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#define HR_INTEG_20 5
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#define HR_INTEG_25 6
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#define HR_INTEG_30 7
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#define HR_INTEG_40 8
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#define HR_INTEG_55 9
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#define HR_INTEG_70 10
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#define HR_INTEG_90 11
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#define HR_INTEG_110 12
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#define HR_INTEG_150 13
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#define HR_INTEG_200 14
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#define HR_INTEG_250 15
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#define HR_INTEG_350 16
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#define HR_INTEG_450 17
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#define HR_INTEG_550 18
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#define HR_OSR_64 0<<2
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#define HR_OSR_256 1<<2
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#define HR_OSR_1024 2<<2
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#define HR_OSR_2048 3<<2
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#define HR_RESETN_RESET 0<<2
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#define HR_RESETN_RUN 1<<2
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#define HR_PDRIVE_70MA 0<<4
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#define HR_PDRIVE_35MA 1<<4
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#define HR_PDRIVE_200MA 2<<4
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#define HR_PDRIVE_100MA 3<<4
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#define HR_INT_FRAME 1<<2
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#define HR_INT_DISABLED 2<<2
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#define HR_IR_DISABLE 0<<7
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#define HR_IR_ENABLE 1<<7
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//------------------------------------------------------
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// Declarations
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void init_hrm(void);
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uint16_t read_hrm(void);
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#endif /* HRM_H */
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/*
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* heart_interface.h
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*
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* Created on: 2014/4/29
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* Author: 01004
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*/
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#ifndef HEART_INTERFACE_H_
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#define HEART_INTERFACE_H_
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#define MIN_HEART_RATE 48
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#define MAX_HEART_RATE 180
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extern int g_heartrate;
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typedef void (*hr_callback)(int);
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/*
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* If there is no g-sensor, fill x, y, z in 0.
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*/
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void add_PPG_XYZ(int ppg, short xx, short yy, short zz);
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/*
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* A callback to handle heartrate events.
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*/
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void register_callback(hr_callback callback);
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/*
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* Ex: report_period = 25.
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* it means report a heart rate every 25 samples.
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*/
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void start(int report_period);
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void reset(void);
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void stop(void);
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#endif /* HEART_INTERFACE_H_ */
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Example Description
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this example is use to measure heart rate of human
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Requirement Components:
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extend board
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work with arduino extended board, which has heart rate sensor
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during the measurement, user has to lie his pulp on the sensor and do not rock the sensor
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the test code will return back the heart rate
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Build code
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1. Please be sure to copy inc\heart_interface.h, inc\HRM_2197.h
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2. Include hr_library.a in IAR project. Add hr_library.a into folder "lib" in IAR project.
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165
RTL00_SDKV35a/example_sources/i2c_epl2197_heartrate/src/main.c
Normal file
165
RTL00_SDKV35a/example_sources/i2c_epl2197_heartrate/src/main.c
Normal file
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/*******************************************************************************
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* HRM.c - Eminent Heart Rate Module (HRM) routines via I2C
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*******************************************************************************/
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#include "HRM_2197.h"
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#include <stdio.h>
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#include <time.h>
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//#include <windows.h>
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#include "heart_interface.h"
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#include "device.h"
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#include "PinNames.h"
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#include "basic_types.h"
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#include "diag.h"
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#include "osdep_api.h"
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#include "i2c_api.h"
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#include "pinmap.h"
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//#include "rtl_lib.h"
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#include "gpio_api.h" // mbed
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#include "main.h"
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#define MBED_I2C_SLAVE_ADDR0 0x41
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#define HR_MODE 0x001b
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#define LED_ENABLE 0x3081
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#define FRAME_ENABLE 0x4804
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#define CHIP_RESET 0x4000
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#define CHIP_RUN 0x4004
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#define DATA_LOCK 0x4005
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#define DATA_UNLOCK 0x4004
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#define I2C_DATA_MAX_LENGTH 20
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#define CLOCK_SET 0x3800
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#define MBED_I2C_MTR_SDA PB_3
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#define MBED_I2C_MTR_SCL PB_2
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#define MBED_I2C_INTB PA_5
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#define MBED_I2C_BUS_CLK 100000 //hz
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uint8_t i2cdata_write[I2C_DATA_MAX_LENGTH];
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uint8_t i2cdata_read[I2C_DATA_MAX_LENGTH];
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uint16_t cmd;
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i2c_t i2cmaster;
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uint8_t integ_time = HR_INTEG_MIN;
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int integ_time_array[] = { 4, 6, 8, 10, 15, 20, 25, 30, 40, 55, 70, 90, 110, 150, 200, 250, 350, 450, 550 };
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//Step1. define the callback to handle event of heart rate update
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/*******************************************************************************
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* report heart rate every 1 second
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*******************************************************************************/
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void on_heartrate_update(int heartrate) {
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printf("heart rate %d\n", heartrate);
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//fflush(stdout);
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}
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char i2cdatasrc[3] = {0x68, 0x90, 0x98};
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static void ePL_WriteCommand(uint16_t cmd)
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{
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i2cdata_write[0] = (uint8_t)(cmd >>8);
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i2cdata_write[1] = (uint8_t)(cmd&0xFF);
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i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdata_write[0], 2, 1);
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}
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uint16_t read_hrm(void) {
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uint32_t raw, normalized_raw;
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int integ_time_changed = 0;
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ePL_WriteCommand(DATA_LOCK);
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i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdatasrc[1], 1, 1);
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i2c_read(&i2cmaster, MBED_I2C_SLAVE_ADDR0, (char*)&i2cdata_read[1], 2, 1);
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i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdatasrc[2], 1, 1);
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i2c_read(&i2cmaster, MBED_I2C_SLAVE_ADDR0, (char*)&i2cdata_read[2], 2, 1);
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raw = i2cdata_read[1];
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raw |= (uint16_t) i2cdata_read[2] << 8;
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normalized_raw = raw >> 4;
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normalized_raw = normalized_raw * integ_time_array[HR_INTEG_BASE];
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normalized_raw = normalized_raw / integ_time_array[integ_time];
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if (raw > HR_TH_HIGH && integ_time > HR_INTEG_MIN) {
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integ_time -= 1;
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integ_time_changed = 1;
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} else if (raw < HR_TH_LOW && integ_time < HR_INTEG_MAX) {
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integ_time += 1;
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integ_time_changed = 1;
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}
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if (integ_time_changed == 1) {
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ePL_WriteCommand(((0x01<<3)<<8) | ( HR_FILTER_4 | integ_time));
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ePL_WriteCommand(((0x08<<3)<<8) | ( HR_RESETN_RESET));
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}
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ePL_WriteCommand(((0x08<<3)<<8) | ( HR_RESETN_RUN));
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return normalized_raw;
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}
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/*******************************************************************************
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* main function to read data, input to library,
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* and calculate heart rate
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*******************************************************************************/
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void main(void) {
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int i, length;
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int *data;
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int should_stop = 0;
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uint16_t result;
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data = (int*) calloc(3000, sizeof(int));
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//load_ppg_signal(data, &length); //Load Test Data From File
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i2c_init(&i2cmaster, MBED_I2C_MTR_SDA ,MBED_I2C_MTR_SCL);
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i2c_frequency(&i2cmaster,MBED_I2C_BUS_CLK);
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//Step2. delegate the event of heart rate update
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register_callback(on_heartrate_update);
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//Step3. Set the data length of heart rate calculation= 2^9 = 512
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ePL_WriteCommand(((0x00<<3)<<8) | ( HR_MODE_HRS | HR_OSR_1024 | HR_GAIN_MID));
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ePL_WriteCommand(((0x01<<3)<<8) | ( HR_FILTER_4 | integ_time));
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ePL_WriteCommand(((0x09<<3)<<8) | ( HR_PDRIVE_70MA));
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ePL_WriteCommand(((0x06<<3)<<8) | ( HR_IR_ENABLE | HR_INT_FRAME));
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ePL_WriteCommand(((0x08<<3)<<8) | ( HR_RESETN_RESET));
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while(1) {
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//Step4. Add ppg data continuously, and the Lib will return the Heart Rate 1 time/sec
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result = read_hrm();
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if(result>100)
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add_PPG_XYZ(result, 0, 0, 0);
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Mdelay(40); //Simulate the ppg input time interval = 40ms
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if(should_stop)
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break;
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}
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//Step5. Stop
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stop();
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free(data);
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}
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/*******************************************************************************
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* initialize ic parameters
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*******************************************************************************/
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/*******************************************************************************
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* read rawdata
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*******************************************************************************/
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