Native ANT+ Part 2 - antlog.bin dignostics

A patch to create an 'antlog.bin' in the current working
directory when working with ANT+ devices. This is to enable
users to test the ANT+ support and share the received messages
to diagnose issues related to parsing messages and displaying
telemetry.

This 'antlog.bin' will ultimately become a native ant file format
and have an associated extension (.ant) and a ridefile reader.
For now it just writes a stream of fixed length messages (12 bytes)
of all received messages.

src/ANT.cpp

@@ -123,6 +123,9 @@ void ANT::run()
 
     if (openPort() == 0) {
 
+        antlog.setFileName("antlog.bin");
+        antlog.open(QIODevice::WriteOnly | QIODevice::Truncate);
+
         isPortOpen = true;
         sendMessage(ANTMessage::resetSystem());
         sendMessage(ANTMessage::setNetworkKey(1, key));
@@ -242,6 +245,9 @@ ANT::stop()
     pvars.lock();
     Status = 0; // Terminate it!
     pvars.unlock();
+
+    // close debug file
+    antlog.close();
     return 0;
 }
 
@@ -516,6 +522,11 @@ ANT::processMessage(void) {
 //qDebug()<<"processing ant message"<<rxMessage[ANT_OFFSET_ID];
     ANTMessage(this, rxMessage); // for debug!
 
+    QDataStream out(&antlog);
+    for (int i=0; i<ANT_MAX_MESSAGE_SIZE; i++)
+        out<<rxMessage[i];
+    
+
     switch (rxMessage[ANT_OFFSET_ID]) {
         case ANT_ACK_DATA:
         case ANT_BROADCAST_DATA:

src/ANT.h

@@ -36,6 +36,7 @@
 #include <QStringList>
 #include <QTime>
 #include <QProgressDialog>
+#include <QFile>
 
 //
 // Time
@@ -329,6 +330,8 @@ private:
     int bytes;
     int checksum;
 
+    // antlog.bin ant message stream
+    QFile antlog;
 };
 
 #endif

src/ANTChannel.cpp

@@ -278,6 +278,7 @@ qDebug()<<"who are you? sent";
         //
         // We got some telemetry on this channel
         //
+qDebug()<<"broadcast datapage="<<antMessage.data_page;
         if (lastMessage.type != 0) {
 
            switch (channel_type) {
@@ -355,7 +356,7 @@ qDebug()<<"got new offset!"<<srm_offset;
                         float power = 3.14159 * nm_torque * cadence / 30;
 
                         // ignore the occassional spikes XXX is this a boundary error on event count ?
-                        if (power > 0 && power < 2501 && cadence >0 && cadence < 256) {
+                        if (power >= 0 && power < 2501 && cadence >=0 && cadence < 256) {
                             parent->setWatts(power);
                             parent->setCadence(cadence);
                         }

src/ANTMessage.cpp

@@ -339,6 +339,8 @@ qDebug()<<"request message";
             // HEARTRATE (high bit is used to indicate data changed)
             //           (every 65th message is a background data message)
             //           (get page # with mask 0x7F)
+            //   ** Note older devices (e.g. GARMIN) do not support
+            //   ** multiple data pages (listed below)
             //   0x00 - Heartrate data
             //   0x01 - Background data page (cumulative data)
             //   0x02 - manufacturer ID and Serial Number
@@ -377,7 +379,12 @@ qDebug()<<"broadcast data, channel="<<message[3]<<"type="<<message[4]<<"calid?"<
             // we need to handle ant sport messages here
             switch(parent->antChannel[message[3]]->channel_type) {
 
-            // Heartrate is fairly simple
+            // Heartrate is fairly simple. Although
+            // many older heart rate devices do not support
+            // multiple data pages, and provide random values
+            // for the data page itself. (E.g. 1st Gen GARMIN)
+            // since we do not care hugely about operating time
+            // and serial numbers etc, we don't even try
             case ANTChannel::CHANNEL_TYPE_HR:
                 channel = message[3];
                 measurementTime = message[8] + (message[9]<<8);