John Greene
/
MAX30101_HR_SPO2
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Dependencies: MAX30101 max32630fthr
Fork of
MAX30101_Demo_Plot_Algorithm
by 
John Greene
Revision 10:fcfa9adc99a9, committed 2017-11-20
- Comitter:
- johnGreeneMaxim
- Date:
- Mon Nov 20 16:36:55 2017 +0000
- Parent:
- 9:affd4e6372a0
- Commit message:
- SPO2 and HR calculations
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| max32630fthr.lib | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Sun Oct 15 19:22:36 2017 +0000
+++ b/main.cpp Mon Nov 20 16:36:55 2017 +0000
@@ -37,10 +37,7 @@
#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);
@@ -54,6 +51,11 @@
op_sensorIntFlag = 1;
}
+//declare large variables outside of main
+uint32_t redData[500];//set array to max fifo size
+uint32_t irData[500];//set array to max fifo size
+
+
int main()
{
Serial pc(USBTX, USBRX); // Use USB debug probe for serial link
@@ -81,132 +83,83 @@
uint16_t idx, readBytes;
int32_t opSample;
uint32_t sample;
- 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];
-
+
+ pc.printf("Starting Program...Please wait a few seconds while data is being collected.\r\n");
while(1)
- {
-
-
+ {
if( rc == 0 )
{
// Check if op_sensor interrupt asserted
if(op_sensorIntFlag)
{
- pc.printf("Entered op_sensorIntFlag check\r\n");
+ //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))
{
- pc.printf("about to read fifo\r\n");
// Read FIFO
rc = op_sensor.readFIFO(MAX30101::TwoLedChannels, fifoData, readBytes);
-
- numSamples = readBytes/DIV_SAMPLE; //calcualtes number of smaples read
-
+
if(rc == 0)
{
// Convert read bytes into samples
- for(idx = 0, c=0, i=0; idx < readBytes; idx+=3)
+ for(idx = 0, c=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;
+ opSample = sample;
+ opSample&=0x03FFFF; //Mask MSB [23:18]
+
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
+ if(r>=450 & ir>=450)//checks to make sure there are 450
+ //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,
+ maxim_heart_rate_and_oxygen_saturation( irData, ir,
redData, &spo2, &spo2Valid, &heartRate, &heartRateValid);
+ pc.printf("SPO2 = %i\r\n",spo2);
+ //heart rate is typically twice what it should be, thus divide by 2
+ pc.printf("Heart Rate = %i\r\n",heartRate/2);
- for(c=100;c<200;c++)//dump first hundred samples after calculations
+ for(c=100;c<450;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");
- }
-
-
+ r=350;
+ ir=350;
+ }
}
}
}
@@ -254,8 +207,8 @@
if(rc == 0)
{
fifoConfig.all = 0;
- fifoConfig.bits.fifo_a_full = 15; // Max level of 15 samples
- fifoConfig.bits.sample_average = MAX30101::AveragedSamples_8; // Average 8 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);
}
--- a/max32630fthr.lib Sun Oct 15 19:22:36 2017 +0000 +++ b/max32630fthr.lib Mon Nov 20 16:36:55 2017 +0000 @@ -1,1 +1,1 @@ -http://developer.mbed.org/teams/MaximIntegrated/code/max32630fthr/#02d6b69121e5 +http://developer.mbed.org/teams/MaximIntegrated/code/max32630fthr/#9eb360063579