From 5b75b82797933acd77a68dd3f369b04a0ce10cea Mon Sep 17 00:00:00 2001
From: Pavel Machek <pavel@ucw.cz>
Date: Tue, 7 Jan 2025 11:44:39 +0100
Subject: [PATCH] spacer: better docs, compute statistics per-system

---
 apps/spacer/README.md     | 14 +++++++++++-
 apps/spacer/spacer.app.js | 48 +++++++++++++++++++++++++++++++++++----
 2 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/apps/spacer/README.md b/apps/spacer/README.md
index 5a8725a96..00d9de4a3 100644
--- a/apps/spacer/README.md
+++ b/apps/spacer/README.md
@@ -4,5 +4,17 @@ Compare GPS with Baido and Glonass
 
 This turns GNSS receiver into mode with all three systems enabled, and
 displays debug info from all of them. Click into top left corner to
-switch navigation systems.
+switch navigation systems. Clicks in bottom half of screen switch info
+pages.
+
+GNSS acquisition has few phases, and this software is assuming you are
+not doing a cold start. GNSS fix needs 4 or 5 satellites with
+reasonable signal strength, and then holding the same place for 40 or
+so seconds.
+
+nil -- no satellites visible
+
+S1..S4 -- not enough satellites being decoded (5 needed)
+
+XXdB -- have enough satellites, but signal is not strong enough
 
diff --git a/apps/spacer/spacer.app.js b/apps/spacer/spacer.app.js
index 1b31afb64..7d4699a7b 100644
--- a/apps/spacer/spacer.app.js
+++ b/apps/spacer/spacer.app.js
@@ -217,10 +217,37 @@ let skys = {
   },
 };
 
+function deepCopy(obj) {
+  if (obj === null || typeof obj !== "object") {
+    return obj; // Return primitive values as-is
+  }
+
+  if (Array.isArray(obj)) {
+    return obj.map(deepCopy); // Handle arrays recursively
+  }
+
+  const copy = {};
+  for (const key in obj) {
+    if (obj.hasOwnProperty(key)) {
+      copy[key] = deepCopy(obj[key]); // Recursively copy properties
+    }
+  }
+  return copy;
+}
+
 let sky = {
   this_usable: 0,
   debug: 0,
   all: skys,  /* Sattelites from all systems */
+  split: 1,
+
+  init: function () {
+    if (this.split) {
+      this.s_gp = deepCopy(skys);
+      this.s_gl = deepCopy(skys);
+      this.s_bd = deepCopy(skys);
+    }
+  },
 
   drawGrid: function() {
     g.setColor(0,0,0);
@@ -272,8 +299,12 @@ let sky = {
   tof: function(v, n) { let i = (1*v); return i.toFixed(n); },
   tof0: function(v) { return this.tof(v, 0); },
   tof1: function(v) { return this.tof(v, 1); },
-  fmtSys: function(sys) {
-    return sys.sent + "." + sys.d23 + "D "+ this.tof(sys.pdop) + " " + this.tof0(sys.vdop) + "\n";
+  fmtSys: function(sys, sats) {
+    let r = sys.sent + " ";
+    // r+= sys.d23 + "D ";
+    if (sats)
+      r +=  sats.sats_used + "/" + sats.snum;
+    return r + "\n";
   },
   drawRace: function() {
     let m = this.old_msg;
@@ -281,9 +312,9 @@ let sky = {
         "q" + m.quality + " S" + m.in_view + " h" + this.tof0(m.hdop) + "m\n" +
         /*        "v" + this.tof0(m.vdop) + "m " + "p" + this.tof0(m.pdop) + "m\n" +  */
         this.all.summary() + "\n" +
-        "gp"+ this.fmtSys(m.gp) +
-        "bd" + this.fmtSys(m.bd)  +
-        "gl" + this.fmtSys(m.gl);
+        "gp"+ this.fmtSys(m.gp, this.s_gp) +
+        "bd" + this.fmtSys(m.bd, this.s_bd)  +
+        "gl" + this.fmtSys(m.gl, this.s_gl);
     if (this.msg.finished != 1)
       msg += "!";
     g.reset().clear().setFont("Vector", 30)
@@ -371,6 +402,8 @@ let sky = {
       if (this.debug > 0)
         print("Have gps sentences", s[1], "/", s[2]);
       this.all.parseSats(s);
+      if (this.split)      
+        this.s_gp.parseSats(s);
       this.msg.gp.sent = ""+s[2];
       return;
     }
@@ -378,6 +411,8 @@ let sky = {
       if (this.debug > 0)
         print("Have baidu sentences", s[1], "/", s[2]);
       this.all.parseSats(s);
+      if (this.split)      
+        this.s_bd.parseSats(s);
       this.msg.bd.sent = ""+s[2];
       return;
     }
@@ -385,6 +420,8 @@ let sky = {
       if (this.debug > 0)
         print("Have glonass sentences", s[1], "/", s[2]);
       this.all.parseSats(s);
+      if (this.split)
+        this.s_gl.parseSats(s);
       this.msg.gl.sent = ""+s[2];
       return;
     }
@@ -442,4 +479,5 @@ ui.init();
 ui.topLeft = () => sky.selectSpace();
 Bangle.on("drag", (b) => ui.touchHandler(b));
 sky.onMessageEnd = onMessage;
+sky.init();
 start();