Adding more examples

Author: Stephen Schiffli

examples/connect.js

@@ -1,7 +1,7 @@
 /**
  * Created by sschiffli on 4/21/16.
  */
-var MetaWear = require('metawear');
+var MetaWear = require('../index')//require('metawear');
 
 // If you know the MAC address, you can uncomment this line
 //MetaWear.discoverByAddress('cb:7d:c5:b0:20:8f', function(device) {

examples/led.js

@@ -1,7 +1,7 @@
 /**
  * Created by sschiffli on 8/15/17.
  */
-var MetaWear = require('metawear');
+var MetaWear = require('../index')//require('metawear');
 
 // If you know the MAC address, you can uncomment this line
 //MetaWear.discoverByAddress('cb:7d:c5:b0:20:8f', function(device) {

examples/logging.js

@@ -0,0 +1,85 @@
+var MetaWear = require('../index')//require('metawear');
+// Store the log event for later download.  If your program needs to terminate
+// before performing the log download, you will need to use mbl_mw_metawearboard_serialize
+// to store the device state and that pass that state as the second argument to
+// connectAndSetUp when you are ready to download.  Use mbl_mw_logger_lookup_id
+// to retrieve this accelLogger object
+var accelLogger = null;
+
+// If you know the MAC address, you can uncomment this line
+//MetaWear.discoverByAddress('f3:97:6b:cc:71:97', function (device) {
+MetaWear.discover(function (device) {
+  console.log('discovered ' + device.address);
+  device.connectAndSetUp(function (error) {
+    if (error) {
+      console.log(error);
+      process.exit(1);
+    }
+    console.log('connected ' + device.address);
+    // Start logging
+    startLogging(device, function (error) {
+      if (error) {
+        console.log(error);
+        process.exit(1);
+      }
+      // Stop logging after 10 seconds
+      setTimeout(function () {
+        downloadLog(device, function (error) {
+          device.once('disconnect', function (reason) {
+            process.exit(0);
+          });
+          MetaWear.mbl_mw_debug_reset(device.board);
+        });
+      }, 10000);
+    });
+  });
+});
+
+function downloadLog(device, callback) {
+  // Shutdown accel
+  MetaWear.mbl_mw_acc_stop(device.board);
+  MetaWear.mbl_mw_acc_disable_acceleration_sampling(device.board);
+  // Shutdown log
+  MetaWear.mbl_mw_logging_stop(device.board);
+  // Setup handerl for accel data points
+  MetaWear.mbl_mw_logger_subscribe(accelLogger, MetaWear.FnVoid_DataP.toPointer(function onSignal(dataPtr) {
+    var data = dataPtr.deref();
+    var pt = data.parseValue();
+    console.log(data.epoch + ' ' + pt.x + ',' + pt.y + ',' + pt.z);
+  }));
+  // Setup the handlers for events during the download
+  var downloadHandler = new MetaWear.LogDownloadHandler();
+  downloadHandler.received_progress_update = MetaWear.FnVoid_UInt_UInt.toPointer(function onSignal(entriesLeft, totalEntries) {
+    console.log('received_progress_update entriesLeft:' + entriesLeft + ' totalEntries:' + totalEntries);
+    if (entriesLeft === 0) {
+      // Remove all log entries if told to stop logging
+      MetaWear.mbl_mw_metawearboard_tear_down(device.board);
+      callback(null);
+    }
+  });
+  downloadHandler.received_unknown_entry = MetaWear.FnVoid_UByte_Long_UByteP_UByte.toPointer(function onSignal(id, epoch, data, length) {
+    console.log('received_unknown_entry');
+  });
+  downloadHandler.received_unhandled_entry = MetaWear.FnVoid_DataP.toPointer(function onSignal(dataPtr) {
+    var data = dataPtr.deref();
+    var dataPoint = data.parseValue();
+    console.log('received_unhandled_entry: ' + dataPoint);
+  });
+  // Actually start the log download, this will cause all the handlers we setup to be invoked
+  MetaWear.mbl_mw_logging_download(device.board, 20, downloadHandler.ref());
+}
+
+function startLogging(device, callback) {
+  MetaWear.mbl_mw_acc_set_odr(device.board, 50.0);
+  MetaWear.mbl_mw_acc_set_range(device.board, 16.0);
+  MetaWear.mbl_mw_acc_write_acceleration_config(device.board);
+
+  MetaWear.mbl_mw_acc_enable_acceleration_sampling(device.board);
+  MetaWear.mbl_mw_acc_start(device.board);
+  // See if we already created a logger
+  var accSignal = MetaWear.mbl_mw_acc_get_acceleration_data_signal(device.board);
+  MetaWear.mbl_mw_datasignal_log(accSignal, MetaWear.FnVoid_DataLoggerP.toPointer(function (logger) {
+    accelLogger = logger;
+    callback(logger.address() ? null : new Error('failed to start logging accel'));
+  }));
+}

examples/multi_device.js

@@ -1,4 +1,5 @@
-var MetaWear = require('metawear');
+var MetaWear = require('../index')//require('metawear');
+var fs = require('fs');
 
 var addresses = [
   'f3:97:6b:cc:71:97',