Diff: main.cpp

Revision:

55:3a7d497a3e03

Parent:

53:06a74fd722b8

Child:

56:83623419d5e4

--- a/main.cpp	Tue Dec 09 08:54:37 2014 +0000
+++ b/main.cpp	Mon Feb 09 04:50:03 2015 +0000
@@ -17,7 +17,6 @@
 #include "mbed.h"
 #include "BLEDevice.h"
 #include "HeartRateService.h"
-#include "BatteryService.h"
 #include "DeviceInformationService.h"
 
 /* Enable the following if you need to throttle the connection interval. This has
@@ -29,9 +28,8 @@
 BLEDevice  ble;
 DigitalOut led1(LED1);
 
-const static char     DEVICE_NAME[]        = "Nordic_HRM";
+const static char     DEVICE_NAME[]        = "HRM1";
 static const uint16_t uuid16_list[]        = {GattService::UUID_HEART_RATE_SERVICE,
-                                              GattService::UUID_BATTERY_SERVICE,
                                               GattService::UUID_DEVICE_INFORMATION_SERVICE};
 static volatile bool  triggerSensorPolling = false;
 
@@ -40,28 +38,6 @@
     ble.startAdvertising(); // restart advertising
 }
 
-void onConnectionCallback(Gap::Handle_t handle, Gap::addr_type_t peerAddrType, const Gap::address_t peerAddr, const Gap::ConnectionParams_t *params)
-{
-    #if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL
-    /* Updating connection parameters can be attempted only after a connection has been
-     * established. Please note that the ble-Central is still the final arbiter for
-     * the effective parameters; the peripheral can only hope that the request is
-     * honored. Please also be mindful of the constraints that might be enforced by
-     * the BLE stack on the underlying controller.*/
-    #define MIN_CONN_INTERVAL 250  /**< Minimum connection interval (250 ms) */
-    #define MAX_CONN_INTERVAL 350  /**< Maximum connection interval (350 ms). */
-    #define CONN_SUP_TIMEOUT  6000 /**< Connection supervisory timeout (6 seconds). */
-    #define SLAVE_LATENCY     4
-
-        Gap::ConnectionParams_t gap_conn_params;
-        gap_conn_params.minConnectionInterval        = Gap::MSEC_TO_GAP_DURATION_UNITS(MIN_CONN_INTERVAL);
-        gap_conn_params.maxConnectionInterval        = Gap::MSEC_TO_GAP_DURATION_UNITS(MAX_CONN_INTERVAL);
-        gap_conn_params.connectionSupervisionTimeout = Gap::MSEC_TO_GAP_DURATION_UNITS(CONN_SUP_TIMEOUT);
-        gap_conn_params.slaveLatency                 = SLAVE_LATENCY;
-        ble.updateConnectionParams(handle, &gap_conn_params);
-    #endif /* #if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL */
-}
-
 void periodicCallback(void)
 {
     led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
@@ -75,20 +51,16 @@
 {
     led1 = 1;
     Ticker ticker;
-    ticker.attach(periodicCallback, 1);
+    ticker.attach(periodicCallback, 1); // blink LED every second
 
     ble.init();
     ble.onDisconnection(disconnectionCallback);
-#if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL
-    ble.onConnection(onConnectionCallback);
-#endif /* #if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL */
 
     /* Setup primary service. */
-    uint8_t hrmCounter = 100;
+    uint8_t hrmCounter = 100; // init HRM to 100bps
     HeartRateService hrService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);
 
-    /* Setup auxiliary services. */
-    BatteryService           battery(ble);
+    /* Setup auxiliary service. */
     DeviceInformationService deviceInfo(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1");
 
     /* Setup advertising. */
@@ -100,20 +72,25 @@
     ble.setAdvertisingInterval(Gap::MSEC_TO_ADVERTISEMENT_DURATION_UNITS(1000));
     ble.startAdvertising();
 
-    while (true) {
+    // infinite loop
+    while (1) {
+        // check for trigger from periodicCallback()
         if (triggerSensorPolling && ble.getGapState().connected) {
             triggerSensorPolling = false;
 
-            /* Do blocking calls or whatever is necessary for sensor polling. */
-            /* In our case, we simply update the dummy HRM measurement. */
+            // Do blocking calls or whatever is necessary for sensor polling.
+            // In our case, we simply update the HRM measurement. 
             hrmCounter++;
+            
+            //  100 <= HRM bps <=175
             if (hrmCounter == 175) {
                 hrmCounter = 100;
             }
-
+            
+            // update bps
             hrService.updateHeartRate(hrmCounter);
         } else {
-            ble.waitForEvent();
+            ble.waitForEvent(); // low power wait for event
         }
     }
 }