hrmmar: bthrm compatibility

- Disable when bthrm is active
- Enable fft elim as default

apps/hrmmar/ChangeLog

@@ -0,0 +1,3 @@
+0.01: New App
+0.02: Disable when bthrm is active
+      Enable fft elim as default

apps/hrmmar/README.md

@@ -7,5 +7,5 @@ Measurements from the build in PPG-Sensor (Photoplethysmograph) is sensitive to
 * **MA removal**
 
 Select the algorithm to Remove Motion artifacts:
-  - None: (default) No Motion Artifact removal.
-  - fft elim: (*experimental*) Remove Motion Artifacts by cutting out the frequencies from the HRM frequency spectrum that are noisy in acceleration spectrum. Under motion this can report a heart rate that is closer to the real one but will fail if motion frequency and heart rate overlap.
+  - None: No Motion Artifact removal.
+  - fft elim: (default, *experimental*) Remove Motion Artifacts by cutting out the frequencies from the HRM frequency spectrum that are noisy in acceleration spectrum. Under motion this can report a heart rate that is closer to the real one but will fail if motion frequency and heart rate overlap.

apps/hrmmar/boot.js

@@ -5,8 +5,12 @@
     bpm_corrected = bpm;
   };
 
+  const isInternal = (hrm) => {
+    return !hrm.src || hrm.src === "int";
+  };
+
   Bangle.on('HRM', (hrm) => {
-    if (bpm_corrected > 0) {
+    if (isInternal(hrm) && bpm_corrected > 0) {
       // replace bpm data in event
       hrm.bpm_orig = hrm.bpm;
       hrm.confidence_orig = hrm.confidence;
@@ -17,16 +21,16 @@
 
   let run = () => {
     const settings = Object.assign({
-        mAremoval: 0
+        mAremoval: 1
     }, require("Storage").readJSON("hrmmar.json", true) || {});
 
     // select motion artifact removal algorithm
     switch(settings.mAremoval) {
       case 1:
-        require("hrmfftelim").run(settings, updateHrm);
+        require("hrmfftelim").run(settings, updateHrm, isInternal);
       break;
     }
-  }
+  };
 
   // override setHRMPower so we can run our code on HRM enable
   const oldSetHRMPower = Bangle.setHRMPower;

apps/hrmmar/fftelim.js

@@ -1,4 +1,4 @@
-exports.run = (settings, updateHrm) => {
+exports.run = (settings, updateHrm, isInternal) => {
   const SAMPLE_RATE = 12.5;
   const NUM_POINTS = 256; // fft size
   const ACC_PEAKS = 2; // remove this number of ACC peaks
@@ -147,7 +147,7 @@ exports.run = (settings, updateHrm) => {
   });
 
   Bangle.on('accel', (acc) => {
-    if (hrmdata !== undefined) {
+    if (hrmdata !== undefined && isInternal(hrmdata)) {
       hrmvalues[idx] = hrmdata.filt;
       accvalues[idx] = acc.x*1000 + acc.y*1000 + acc.z*1000;
       idx++;

apps/hrmmar/metadata.json

@@ -3,7 +3,7 @@
   "name": "HRM Motion Artifacts removal",
   "shortName":"HRM MA removal",
   "icon": "app.png",
-  "version":"0.01",
+  "version":"0.02",
   "description": "Removes Motion Artifacts in Bangle.js's heart rate sensor data.",
   "type": "bootloader",
   "tags": "health",

apps/hrmmar/settings.js

@@ -2,7 +2,7 @@
   var FILE = "hrmmar.json";
   // Load settings
   var settings = Object.assign({
-   mAremoval: 0,
+   mAremoval: 1,
   }, require('Storage').readJSON(FILE, true) || {});
 
   function writeSettings() {