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LPC_MAX30102
the MAX30102 driver for LPC1768 board
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main.cpp
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00001 /** \file main.cpp ****************************************************** 00002 * 00003 * Project: MAXREFDES117# 00004 * Filename: main.cpp 00005 * Description: This module contains the Main application for the MAXREFDES117 example program. 00006 * 00007 * 00008 * -------------------------------------------------------------------- 00009 * 00010 * This code follows the following naming conventions: 00011 * 00012 * char ch_pmod_value 00013 * char (array) s_pmod_s_string[16] 00014 * float f_pmod_value 00015 * int32_t n_pmod_value 00016 * int32_t (array) an_pmod_value[16] 00017 * int16_t w_pmod_value 00018 * int16_t (array) aw_pmod_value[16] 00019 * uint16_t uw_pmod_value 00020 * uint16_t (array) auw_pmod_value[16] 00021 * uint8_t uch_pmod_value 00022 * uint8_t (array) auch_pmod_buffer[16] 00023 * uint32_t un_pmod_value 00024 * int32_t * pn_pmod_value 00025 * 00026 * ------------------------------------------------------------------------- */ 00027 /******************************************************************************* 00028 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. 00029 * 00030 * Permission is hereby granted, free of charge, to any person obtaining a 00031 * copy of this software and associated documentation files (the "Software"), 00032 * to deal in the Software without restriction, including without limitation 00033 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 00034 * and/or sell copies of the Software, and to permit persons to whom the 00035 * Software is furnished to do so, subject to the following conditions: 00036 * 00037 * The above copyright notice and this permission notice shall be included 00038 * in all copies or substantial portions of the Software. 00039 * 00040 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 00041 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00042 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 00043 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES 00044 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 00045 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 00046 * OTHER DEALINGS IN THE SOFTWARE. 00047 * 00048 * Except as contained in this notice, the name of Maxim Integrated 00049 * Products, Inc. shall not be used except as stated in the Maxim Integrated 00050 * Products, Inc. Branding Policy. 00051 * 00052 * The mere transfer of this software does not imply any licenses 00053 * of trade secrets, proprietary technology, copyrights, patents, 00054 * trademarks, maskwork rights, or any other form of intellectual 00055 * property whatsoever. Maxim Integrated Products, Inc. retains all 00056 * ownership rights. 00057 ******************************************************************************* 00058 */ 00059 /*!\mainpage Main Page 00060 * 00061 * \section intro_sec Introduction 00062 * 00063 * This is the code documentation for the MAXREFDES117# subsystem reference design. 00064 * 00065 * The Files page contains the File List page and the Globals page. 00066 * 00067 * The Globals page contains the Functions, Variables, and Macros sub-pages. 00068 * 00069 * \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram" 00070 * 00071 * \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart" 00072 * 00073 */ 00074 #include "mbed.h" 00075 #include "algorithm.h" 00076 #include "MAX30102.h" 00077 00078 #define MAX_BRIGHTNESS 255 00079 #define false 0 00080 #define true 1 00081 00082 uint32_t aun_ir_buffer[500]; //IR LED sensor data 00083 int32_t n_ir_buffer_length; //data length 00084 uint32_t aun_red_buffer[500]; //Red LED sensor data 00085 int32_t n_sp02; //SPO2 value 00086 int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid 00087 int32_t n_heart_rate; //heart rate value 00088 int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid 00089 uint8_t uch_dummy; 00090 00091 Serial pc(USBTX, USBRX); //initializes the serial port 00092 DigitalIn INT(p8); //pin P8 connects to the interrupt output pin of the MAX30102 00093 PwmOut led(LED1); //initializes the pwm output that connects to the on board LED 00094 00095 // the setup routine runs once when you press reset: 00096 int main() { 00097 uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats 00098 int i; 00099 int32_t n_brightness; 00100 float f_temp; 00101 00102 maxim_max30102_reset(); //resets the MAX30102 00103 // initialize serial communication at 115200 bits per second: 00104 pc.baud(115200); 00105 pc.format(8,SerialBase::None,1); 00106 wait(1); 00107 00108 //read and clear status register 00109 maxim_max30102_read_reg(0,&uch_dummy); 00110 00111 //wait until the user presses a key 00112 while(pc.readable()==0) 00113 { 00114 pc.printf("\x1B[2J"); //clear terminal program screen 00115 pc.printf("Press any key to start conversion\n\r"); 00116 wait(1); 00117 } 00118 uch_dummy=getchar(); 00119 00120 maxim_max30102_init(); //initializes the MAX30102 00121 00122 00123 n_brightness=0; 00124 un_min=0x3FFFF; 00125 un_max=0; 00126 00127 n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps 00128 00129 //read the first 500 samples, and determine the signal range 00130 for(i=0;i<n_ir_buffer_length;i++) 00131 { 00132 while(INT.read()==1); //wait until the interrupt pin asserts 00133 00134 maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); //read from MAX30102 FIFO 00135 00136 if(un_min>aun_red_buffer[i]) 00137 un_min=aun_red_buffer[i]; //update signal min 00138 if(un_max<aun_red_buffer[i]) 00139 un_max=aun_red_buffer[i]; //update signal max 00140 pc.printf("red="); 00141 pc.printf("%i", aun_red_buffer[i]); 00142 pc.printf(", ir="); 00143 pc.printf("%i\n\r", aun_ir_buffer[i]); 00144 } 00145 un_prev_data=aun_red_buffer[i]; 00146 00147 00148 //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples) 00149 maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid); 00150 00151 //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second 00152 while(1) 00153 { 00154 i=0; 00155 un_min=0x3FFFF;//??? 00156 un_max=0; 00157 00158 //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top 00159 for(i=100;i<500;i++) 00160 { 00161 aun_red_buffer[i-100]=aun_red_buffer[i]; 00162 aun_ir_buffer[i-100]=aun_ir_buffer[i]; 00163 00164 //update the signal min and max 00165 if(un_min>aun_red_buffer[i]) 00166 un_min=aun_red_buffer[i]; 00167 if(un_max<aun_red_buffer[i]) 00168 un_max=aun_red_buffer[i]; 00169 } 00170 00171 //take 100 sets of samples before calculating the heart rate. 00172 for(i=400;i<500;i++) 00173 { 00174 un_prev_data=aun_red_buffer[i-1]; 00175 while(INT.read()==1); 00176 maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); 00177 00178 if(aun_red_buffer[i]>un_prev_data)//just to determine the brightness of LED according to the deviation of adjacent two AD data 00179 { 00180 f_temp=aun_red_buffer[i]-un_prev_data; 00181 f_temp/=(un_max-un_min); 00182 f_temp*=MAX_BRIGHTNESS; 00183 n_brightness-=(int)f_temp; 00184 if(n_brightness<0) 00185 n_brightness=0; 00186 } 00187 else 00188 { 00189 f_temp=un_prev_data-aun_red_buffer[i]; 00190 f_temp/=(un_max-un_min); 00191 f_temp*=MAX_BRIGHTNESS; 00192 n_brightness+=(int)f_temp; 00193 if(n_brightness>MAX_BRIGHTNESS) 00194 n_brightness=MAX_BRIGHTNESS; 00195 } 00196 00197 led.write(1-(float)n_brightness/256);//pwm control led brightness 00198 00199 //send samples and calculation result to terminal program through UART 00200 pc.printf("red="); 00201 pc.printf("%i", aun_red_buffer[i]); 00202 pc.printf(", ir="); 00203 pc.printf("%i", aun_ir_buffer[i]); 00204 pc.printf(", HR=%i, ", n_heart_rate); 00205 pc.printf("HRvalid=%i, ", ch_hr_valid); 00206 pc.printf("SpO2=%i, ", n_sp02); 00207 pc.printf("SPO2Valid=%i\n\r", ch_spo2_valid); 00208 } 00209 maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid); 00210 } 00211 } 00212
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