John Greene
/
MAX30101_Demo_Plot_Algorithm
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Dependencies: MAX30101 max32630fthr
Fork of
MAX30101_Demo_Plot
by 
John Greene
Diff: main.cpp
- Revision:
- 9:affd4e6372a0
- Parent:
- 8:a1538e8a3fd9
--- a/main.cpp Tue Sep 26 16:45:15 2017 +0000
+++ b/main.cpp Sun Oct 15 19:22:36 2017 +0000
@@ -35,6 +35,12 @@
#include "mbed.h"
#include "max32630fthr.h"
#include "MAX30101.h"
+#include "algorithm.h"
+
+//equals 3*number of LEDS used
+#define DIV_SAMPLE 6
+//sets the number of samples sent to the heart rate and SPO2 calculation
+#define CALC_SAMPLE 500
MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
@@ -75,32 +81,132 @@
uint16_t idx, readBytes;
int32_t opSample;
uint32_t sample;
- while(1) {
-
- if( rc == 0 ) {
+ uint32_t redData[500];//set array to max fifo size
+ uint32_t irData[500];//set array to max fifo size
+ int r=0; //counter for redData position
+ int ir=0; //counter for irData position
+ int c=0; //counter to print values
+ int i =0; //second counter
+ int32_t spo2 =0;
+ int8_t spo2Valid = 0;
+ int32_t heartRate = 0;
+ int8_t heartRateValid = 0;
+ int32_t numSamples = 0;
+ uint32_t fifoIR[MAX30101::MAX_FIFO_BYTES];
+ uint32_t fifoRED[MAX30101::MAX_FIFO_BYTES];
+
+
+ while(1)
+ {
+
+
+ if( rc == 0 )
+ {
// Check if op_sensor interrupt asserted
- if(op_sensorIntFlag) {
-
+ if(op_sensorIntFlag)
+ {
+ pc.printf("Entered op_sensorIntFlag check\r\n");
op_sensorIntFlag = 0; // Lower interrupt flag
rc = op_sensor.getInterruptStatus(ints); // Read interrupt status
// Check if FIFO almost full interrupt asserted
- if((rc == 0) && (ints.bits.a_full)) {
-
+ if((rc == 0) && (ints.bits.a_full))
+ {
+ pc.printf("about to read fifo\r\n");
// Read FIFO
- rc = op_sensor.readFIFO(MAX30101::OneLedChannel, fifoData, readBytes);
+ rc = op_sensor.readFIFO(MAX30101::TwoLedChannels, fifoData, readBytes);
- if(rc == 0) {
+ numSamples = readBytes/DIV_SAMPLE; //calcualtes number of smaples read
+
+ if(rc == 0)
+ {
// Convert read bytes into samples
- for(idx = 0; idx < readBytes; idx+=3) {
+ for(idx = 0, c=0, i=0; idx < readBytes; idx+=3)
+ {
+ //pc.printf("In sample adjustment \r\n");
sample = (fifoData[idx]<<16) | (fifoData[idx+1]<<8) | (fifoData[idx+2]);
opSample = sample << 14; // Sign extends sample
opSample = opSample >> 14;
- pc.printf("%i\r\n", opSample); // Print results
+ if(idx%2==0)
+ {
+ //pc.printf("end red allocation\r\n");
+ redData[r] = opSample;//saves to buff for calculations
+ fifoRED[i] = opSample;//saves to buff to print values just obtained
+ r++;
+ i++;
+
+ }
+ else
+ {
+ //pc.printf("end ir allocation\r\n");
+ irData[ir] = opSample; //saves to buff for calculations
+ fifoIR[c] = opSample;//saves to buff to print values just obtained
+ ir++;
+ c++;
+
+ }
+ pc.printf("Red count = %i\r\n IR count = %i\r\n",r,ir);
+ //pc.printf("idx = %i and readbytes = %i\r\n", idx,readBytes);
+
}
+ if(r>=200 & ir>=200)//checks to make sure there are 200 samples in data buffers
+ {
+ pc.printf("In Calculation Function\r\n");
+ //calculate heart rate and spo2
+ maxim_heart_rate_and_oxygen_saturation( irData, CALC_SAMPLE,
+ redData, &spo2, &spo2Valid, &heartRate, &heartRateValid);
+
+ for(c=100;c<200;c++)//dump first hundred samples after calculations
+ {
+ redData[c-100]=redData[c];
+ irData[c-100]=irData[c];
+
+ }
+ r=50;
+ ir=50;
+
+
+ }
+
+
+
+ pc.printf("Read Samples %i\r\n",numSamples);
+ //prints the Red LED data
+ pc.printf("RED LED DATA\r\n");
+ for(c=0; c<numSamples; c++)
+ {
+ pc.printf("%i\r\n",fifoRED[c]);
+ }
+
+ //prints the IR LED data
+ pc.printf("IR LED DATA\r\n");
+ for(c=0; c<numSamples; c++)
+ {
+ pc.printf("%i\r\n",fifoIR[c]);
+ }
+
+ if(spo2Valid==1)
+ {
+ pc.printf("SPO2 = %i\r\n",spo2);
+ spo2Valid=0;
+ }
+ else
+ {
+ pc.printf("SPO2 calculation waiting for enough samples\r\n");
+ }
+ if(heartRateValid==1)
+ {
+ pc.printf("Heart Rate = %i\r\n",heartRate);
+ heartRateValid=0;
+ }else
+ {
+ pc.printf("Heart rate calculation waiting for enough samples\r\n");
+ }
+
+
}
}
}
@@ -138,8 +244,8 @@
if(rc == 0)
{
ints.all = 0;
- ints.bits.die_temp = 1; // Enable FIFO almost full interrupt
- ints.bits.a_full = 1; // Enable internal die temp. interrupt
+ ints.bits.die_temp = 1; // Enable internal die temp. interrupt
+ ints.bits.a_full = 1; // Enable FIFO almost full interrupt
rc = op_sensor.enableInterrupts(ints);
}
@@ -148,7 +254,7 @@
if(rc == 0)
{
fifoConfig.all = 0;
- fifoConfig.bits.fifo_a_full = 15; // Max level of 15 samples
+ fifoConfig.bits.fifo_a_full = 15; // Max level of 15 samples
fifoConfig.bits.sample_average = MAX30101::AveragedSamples_8; // Average 8 samples
rc = op_sensor.setFIFOConfiguration(fifoConfig);
}
@@ -156,24 +262,29 @@
MAX30101::SpO2Configuration_u spo2Config;
if(rc == 0)
{
- spo2Config.all = 0;
- spo2Config.bits.spo2_sr = MAX30101::SR_3200_Hz; // SpO2 SR = 1600Hz
+ spo2Config.all = 0; // sets smallest LSB size
+ spo2Config.bits.spo2_sr = MAX30101::SR_3200_Hz; // SpO2 SR = 3200Hz
spo2Config.bits.led_pw = MAX30101::PW_3; // 18-bit ADC resolution
rc = op_sensor.setSpO2Configuration(spo2Config);
}
- //Set LED1 drive current
+ //Set LED drive currents
if(rc == 0)
{
// Heart Rate only, 1 LED channel, Pulse amp. = 0x1F
rc = op_sensor.setLEDPulseAmplitude(MAX30101::LED1_PA, 0x1F);
+ //To include SPO2, 2 LED channel, Pulse amp. 0x1F
+ if(rc==0)
+ {
+ rc = op_sensor.setLEDPulseAmplitude(MAX30101::LED2_PA, 0x1F);
+ }
}
//Set operating mode
modeConfig.all = 0;
if(rc == 0)
{
- modeConfig.bits.mode = MAX30101::HeartRateMode; // Heart-rate only
+ modeConfig.bits.mode = MAX30101::SpO2Mode; // Sets SPO2 Mode
rc = op_sensor.setModeConfiguration(modeConfig);
}