luo xiaoming
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RD117_MBED
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Maxim Integrated
Diff: main.cpp
- Revision:
- 0:346a7fa07998
- Child:
- 3:7c0fb55eb3ff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Apr 20 21:46:06 2016 +0000
@@ -0,0 +1,224 @@
+/** \file main.cpp ******************************************************
+*
+* Project: MAXREFDES117#
+* Filename: main.cpp
+* Description: This module contains the Main application for the MAXREFDES117 example program.
+*
+* Revision History:
+*\n 1-18-2016 Rev 01.00 GL Initial release.
+*\n
+*
+* --------------------------------------------------------------------
+*
+* This code follows the following naming conventions:
+*
+*\n char ch_pmod_value
+*\n char (array) s_pmod_s_string[16]
+*\n float f_pmod_value
+*\n int32_t n_pmod_value
+*\n int32_t (array) an_pmod_value[16]
+*\n int16_t w_pmod_value
+*\n int16_t (array) aw_pmod_value[16]
+*\n uint16_t uw_pmod_value
+*\n uint16_t (array) auw_pmod_value[16]
+*\n uint8_t uch_pmod_value
+*\n uint8_t (array) auch_pmod_buffer[16]
+*\n uint32_t un_pmod_value
+*\n int32_t * pn_pmod_value
+*
+* ------------------------------------------------------------------------- */
+/*******************************************************************************
+* Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a
+* copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,
+* and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+* OTHER DEALINGS IN THE SOFTWARE.
+*
+* Except as contained in this notice, the name of Maxim Integrated
+* Products, Inc. shall not be used except as stated in the Maxim Integrated
+* Products, Inc. Branding Policy.
+*
+* The mere transfer of this software does not imply any licenses
+* of trade secrets, proprietary technology, copyrights, patents,
+* trademarks, maskwork rights, or any other form of intellectual
+* property whatsoever. Maxim Integrated Products, Inc. retains all
+* ownership rights.
+*******************************************************************************
+*/
+/*!\mainpage Main Page
+*
+* \section intro_sec Introduction
+*
+* This is the code documentation for the MAXREFDES117# subsystem reference design.
+* \n
+* \n The Files page contains the File List page and the Globals page.
+* \n
+* \n The Globals page contains the Functions, Variables, and Macros sub-pages.
+*
+* \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram"
+* \n
+* \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart"
+*
+*/
+#include "mbed.h"
+#include "main.h"
+#include "algorithm.h"
+#include "MAX30102.h"
+
+#define MAX_BRIGHTNESS 255
+
+uint32_t un_ir_buffer[500]; //IR LED sensor data
+int32_t n_ir_buffer_length; //data length
+uint32_t un_red_buffer[500]; //Red LED sensor data
+int32_t n_sp02; //SPO2 value
+int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid
+int32_t n_heart_rate; //heart rate value
+int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid
+uint8_t uch_dummy;
+
+Serial pc(USBTX, USBRX); //initializes the serial port
+#ifdef TARGET_KL25Z
+PwmOut led(PTB18); //initializes the pwm output that connects to the on board LED
+DigitalIn INT(PTD1); //pin PTD1 connects to the interrupt output pin of the MAX30102
+#endif
+#ifdef TARGET_K64F
+DigitalIn INT(PTD1); //pin PTD1 connects to the interrupt output pin of the MAX30102
+#endif
+#ifdef TARGET_MAX32600MBED
+PwmOut led(LED_RED); //initializes the pwm output that connects to the on board LED
+DigitalIn INT(P2_0); //pin P20 connects to the interrupt output pin of the MAX30102
+#endif
+
+// the setup routine runs once when you press reset:
+int main() {
+ uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats
+ int i;
+ int32_t n_brightness;
+ float f_temp;
+
+ maxim_max30102_reset(); //resets the MAX30102
+ // initialize serial communication at 115200 bits per second:
+ pc.baud(115200);
+ pc.format(8,SerialBase::None,1);
+ wait(1);
+
+ //read and clear status register
+ maxim_max30102_read_reg(0,&uch_dummy);
+
+ //wait until the user presses a key
+ while(pc.readable()==0)
+ {
+ pc.printf("%c[2J",27); //clear terminal program screen
+ pc.printf("Press any key to start conversion\n\r");
+ wait(1);
+ }
+ uch_dummy=getchar();
+
+ maxim_max30102_init(); //initializes the MAX30102
+
+
+ n_brightness=0;
+ un_min=0x3FFFF;
+ un_max=0;
+
+ n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
+
+ //read the first 500 samples, and determine the signal range
+ for(i=0;i<n_ir_buffer_length;i++)
+ {
+ while(INT.read()==1); //wait until the interrupt pin asserts
+
+ maxim_max30102_read_fifo((un_red_buffer+i), (un_ir_buffer+i)); //read from MAX30102 FIFO
+
+ if(un_min>un_red_buffer[i])
+ un_min=un_red_buffer[i]; //update signal min
+ if(un_max<un_red_buffer[i])
+ un_max=un_red_buffer[i]; //update signal max
+ pc.printf("red=");
+ pc.printf("%i", un_red_buffer[i]);
+ pc.printf(", ir=");
+ pc.printf("%i\n\r", un_ir_buffer[i]);
+ }
+ un_prev_data=un_red_buffer[i];
+
+
+ //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
+ maxim_heart_rate_and_oxygen_saturation(un_ir_buffer, n_ir_buffer_length, un_red_buffer , &n_sp02, &ch_spo2_valid , &n_heart_rate , &ch_hr_valid);
+
+ //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second
+ while(1)
+ {
+ i=0;
+ un_min=0x3FFFF;
+ un_max=0;
+
+ //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
+ for(i=100;i<500;i++)
+ {
+ un_red_buffer[i-100]=un_red_buffer[i];
+ un_ir_buffer[i-100]=un_ir_buffer[i];
+
+ //update the signal min and max
+ if(un_min>un_red_buffer[i])
+ un_min=un_red_buffer[i];
+ if(un_max<un_red_buffer[i])
+ un_max=un_red_buffer[i];
+ }
+
+ //take 100 sets of samples before calculating the heart rate.
+ for(i=400;i<500;i++)
+ {
+ un_prev_data=un_red_buffer[i-1];
+ while(INT.read()==1);
+ maxim_max30102_read_fifo((un_red_buffer+i), (un_ir_buffer+i));
+
+ if(un_red_buffer[i]>un_prev_data)
+ {
+ f_temp=un_red_buffer[i]-un_prev_data;
+ f_temp/=(un_max-un_min);
+ f_temp*=MAX_BRIGHTNESS;
+ n_brightness-=(int)f_temp;
+ if(n_brightness<0)
+ n_brightness=0;
+ }
+ else
+ {
+ f_temp=un_prev_data-un_red_buffer[i];
+ f_temp/=(un_max-un_min);
+ f_temp*=MAX_BRIGHTNESS;
+ n_brightness+=(int)f_temp;
+ if(n_brightness>MAX_BRIGHTNESS)
+ n_brightness=MAX_BRIGHTNESS;
+ }
+#if defined(TARGET_KL25Z) || defined(TARGET_MAX32600MBED)
+ led.write(1-(float)n_brightness/256);
+#endif
+ //send samples and calculation result to terminal program through UART
+ pc.printf("red=");
+ pc.printf("%i",un_red_buffer[i]);
+ pc.printf(", ir=");
+ pc.printf("%i", un_ir_buffer[i]);
+ pc.printf(", HR=%i, ",n_heart_rate);
+ pc.printf("HRvalid=%i, ",ch_hr_valid);
+ pc.printf("SpO2=%i, ",n_sp02);
+ pc.printf("SPO2Valid=%i\n\r",ch_spo2_valid);
+ }
+ maxim_heart_rate_and_oxygen_saturation(un_ir_buffer, n_ir_buffer_length, un_red_buffer , &n_sp02, &ch_spo2_valid , &n_heart_rate , &ch_hr_valid);
+
+ }
+}
+
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