John Greene / Mbed OS MAX30101_Demo_Plot

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Dependencies:   MAX30101 max32630fthr

Fork of MAX30101_Demo_Plot by Central Applications - Mbed Code repo

Diff: main.cpp

Revision:
7:6075af57668e
Parent:
6:238d2eec53de
Child:
8:a1538e8a3fd9
--- a/main.cpp	Tue Aug 29 20:32:39 2017 +0000
+++ b/main.cpp	Tue Sep 05 14:11:26 2017 +0000
@@ -69,7 +69,7 @@
     
     uint8_t fifoData[MAX30101::MAX_FIFO_BYTES];
     uint16_t idx, readBytes;
-    int16_t opSample;
+    int32_t opSample;
     uint32_t sample;
     while(1) {
 
@@ -92,7 +92,8 @@
                         // Convert read bytes into samples
                         for(idx = 0; idx < readBytes; idx+=3) {
                             sample = (fifoData[idx]<<16) | (fifoData[idx+1]<<8) | (fifoData[idx+2]);
-                            opSample = sample >> 8;            // Sign extends sample to 16-bit opSample
+                            opSample = sample << 14;           // Sign extends sample 
+                            opSample = opSample >> 14;
                             pc.printf("%i\r\n", opSample);     // Print results
                         }
                         
@@ -152,8 +153,8 @@
     if(rc == 0)
     {
         spo2Config.all = 0;
-        spo2Config.bits.spo2_sr = MAX30101::SR_400_Hz;      // SpO2 SR = 400Hz
-        spo2Config.bits.led_pw = 1;                         // 16-bit ADC resolution
+        spo2Config.bits.spo2_sr = MAX30101::SR_3200_Hz;     // SpO2 SR = 1600Hz
+        spo2Config.bits.led_pw = MAX30101::PW_3;            // 18-bit ADC resolution
         rc = op_sensor.setSpO2Configuration(spo2Config);
     }