Diff: spo2_main.cpp

Revision:

7:94fa5b72481d

Parent:

6:d4c401190320

--- a/spo2_main.cpp	Sun Sep 15 13:13:10 2019 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,144 +0,0 @@
-#include "mbed.h"
-#include "MAX14720.h"
-#include "MAX30102.h"
-#include "USBSerial.h"
-#include "System.h"
-#include "algorithm.h"
-
-/// define the HVOUT Boost Voltage default for the MAX14720 PMIC
-#define HVOUT_VOLTAGE 4500 // set to 4500 mV
-
-#define MAX14720_I2C_SLAVE_ADDR (0x54)
-
-#define MAX_BRIGHTNESS 255
-
-uint32_t aun_ir_buffer[500]; //IR LED sensor data
-int32_t n_ir_buffer_length;    //data length
-uint32_t aun_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
-/// Define with Maxim VID and a Maxim assigned PID, set to version 0x0001 and non-blocking
-
-USBSerial usbSerial(0x0b6a, 0x0122, 0x0001, false);
-
-/// I2C Master 2
-I2C i2c2(I2C2_SDA, I2C2_SCL); // used by MAX14720, MAX30101, LIS2DH
-/// SPI Master 0 with SPI0_SS for use with MAX30001
-
-MAX14720 max14720(&i2c2, MAX14720_I2C_SLAVE_ADDR);
-DigitalOut led(LED1); 
-DigitalIn INT(P4_0);
-int main(){
-//---------------------------------------------------
-  // hold results for returning functions
-    int result;
-    // initialize HVOUT on the MAX14720 PMIC
-    result = max14720.init();
-    if (result == MAX14720_ERROR){
-        printf("Error initializing MAX14720");
-    }
-    max14720.boostEn = MAX14720::BOOST_ENABLED;
-    max14720.boostSetVoltage(HVOUT_VOLTAGE);
-//--------------------------------------------------- 
-    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;
-    long unBlockedValue = 0;
-    
-    maxim_max30102_reset(); //resets the MAX30102
-    wait(1);
-    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((aun_red_buffer+i), (aun_ir_buffer+i));  //read from MAX30102 FIFO
-            
-        if(un_min>aun_red_buffer[i])
-            un_min=aun_red_buffer[i];    //update signal min
-        if(un_max<aun_red_buffer[i])
-            un_max=aun_red_buffer[i];    //update signal max
-        /*usbSerial.printf("red=");
-        usbSerial.printf("%i", aun_red_buffer[i]);
-        usbSerial.printf(", ir=");
-        usbSerial.printf("%i\n\r", aun_ir_buffer[i]);*/
-    }
-    un_prev_data=aun_red_buffer[i];
-    
-    
-    //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
-    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); 
-    
-    //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=200;i<500;i++)
-        {
-            aun_red_buffer[i-200]=aun_red_buffer[i];
-            aun_ir_buffer[i-200]=aun_ir_buffer[i];
-            
-            //update the signal min and max
-            if(un_min>aun_red_buffer[i])
-            un_min=aun_red_buffer[i];
-            if(un_max<aun_red_buffer[i])
-            un_max=aun_red_buffer[i];
-        }
-        
-        //take 100 sets of samples before calculating the heart rate.
-        for(i=300;i<500;i++)
-        {
-            un_prev_data=aun_red_buffer[i-1];
-            while(INT.read()==1);
-            maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));
-        
-            if(aun_red_buffer[i]>un_prev_data)
-            {
-                f_temp=aun_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-aun_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;
-            }
-            //send samples and calculation result to terminal program through UART
-            /*usbSerial.printf("red=");
-            usbSerial.printf("%i", aun_red_buffer[i]);
-            usbSerial.printf(", ir=");
-            usbSerial.printf("%i", aun_ir_buffer[i]);*/
-            usbSerial.printf("HR=%i\t", n_heart_rate); 
-            //usbSerial.printf("HRvalid=%i, ", ch_hr_valid);
-            usbSerial.printf("SpO2=%i\n\r", n_sp02);
-            //usbSerial.printf("SPO2Valid=%i\n\r", ch_spo2_valid);
-        }
-        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); 
-  } 
-}
\ No newline at end of file