add sensor service notify callback

Author: hathach

libraries/BLEAdafruitService/src/services/BLEAdafruitQuaternion.cpp

@@ -95,7 +95,7 @@ void BLEAdafruitQuaternion::setCalibration(Adafruit_Sensor_Calibration* calib)
   _calib = calib;
 }
 
-void BLEAdafruitQuaternion::_notify_cb(uint16_t conn_hdl, uint16_t value)
+void BLEAdafruitQuaternion::_notify_handler(uint16_t conn_hdl, uint16_t value)
 {
   // Start/Stop filter timer
   if (value & BLE_GATT_HVX_NOTIFICATION)
@@ -107,7 +107,7 @@ void BLEAdafruitQuaternion::_notify_cb(uint16_t conn_hdl, uint16_t value)
   }
 
   // Call SuperClass function
-  BLEAdafruitSensor::_notify_cb(conn_hdl, value);
+  BLEAdafruitSensor::_notify_handler(conn_hdl, value);
 }
 
 void BLEAdafruitQuaternion::_update_timer(int32_t ms)

libraries/BLEAdafruitService/src/services/BLEAdafruitQuaternion.h

@@ -43,7 +43,7 @@ class BLEAdafruitQuaternion : public BLEAdafruitSensor
   protected:
     void _update_timer(int32_t ms);
     void _measure_handler(void);
-    void _notify_cb(uint16_t conn_hdl, uint16_t value);
+    void _notify_handler(uint16_t conn_hdl, uint16_t value);
 
     void _fitler_update(void);
 

libraries/BLEAdafruitService/src/services/BLEAdafruitSensor.cpp

@@ -31,8 +31,9 @@
 BLEAdafruitSensor::BLEAdafruitSensor(BLEUuid service_uuid, BLEUuid data_uuid)
   : BLEService(service_uuid), _measurement(data_uuid), _period(UUID128_CHR_ADAFRUIT_MEASUREMENT_PERIOD)
 {
-  _measure_cb = NULL;
   _sensor = NULL;
+  _measure_cb = NULL;
+  _notify_cb = NULL;
 }
 
 err_t BLEAdafruitSensor::_begin(int32_t ms)
@@ -76,10 +77,15 @@ void BLEAdafruitSensor::setPeriod(int32_t period_ms)
   _update_timer(period_ms);
 }
 
+void BLEAdafruitSensor::setNotifyCallback(notify_callback_t fp)
+{
+  _notify_cb = fp;
+}
+
 //--------------------------------------------------------------------+
 // Internal API
 //--------------------------------------------------------------------+
-void BLEAdafruitSensor::_notify_cb(uint16_t conn_hdl, uint16_t value)
+void BLEAdafruitSensor::_notify_handler(uint16_t conn_hdl, uint16_t value)
 {
   // notify enabled
   if (value & BLE_GATT_HVX_NOTIFICATION)
@@ -90,6 +96,9 @@ void BLEAdafruitSensor::_notify_cb(uint16_t conn_hdl, uint16_t value)
     _timer.stop();
   }
 
+  // invoke callback if any
+  if (_notify_cb) _notify_cb(conn_hdl, value);
+
   // send initial notification if period = 0
   //  if ( 0 == svc._period.read32() )
   //  {
@@ -178,6 +187,6 @@ void BLEAdafruitSensor::sensor_data_cccd_cb(uint16_t conn_hdl, BLECharacteristic
 {
   BLEAdafruitSensor* svc = (BLEAdafruitSensor*) &chr->parentService();
 
-  svc->_notify_cb(conn_hdl, value);
+  svc->_notify_handler(conn_hdl, value);
 }
 

libraries/BLEAdafruitService/src/services/BLEAdafruitSensor.h

@@ -31,6 +31,8 @@ class BLEAdafruitSensor : public BLEService
 {
   public:
     static const int32_t DEFAULT_PERIOD = 1000;
+
+    typedef void (*notify_callback_t)(uint16_t conn_hdl, bool enabled);
     typedef uint16_t (*measure_callback_t )(uint8_t* buf, uint16_t bufsize);
 
     BLEAdafruitSensor(BLEUuid service_uuid, BLEUuid data_uuid);
@@ -39,6 +41,7 @@ class BLEAdafruitSensor : public BLEService
     virtual err_t begin(Adafruit_Sensor* sensor, int32_t ms = DEFAULT_PERIOD);
 
     void setPeriod(int32_t period_ms);
+    void setNotifyCallback(notify_callback_t fp);
 
   protected:
     BLECharacteristic _period;
@@ -47,13 +50,15 @@ class BLEAdafruitSensor : public BLEService
     Adafruit_Sensor*  _sensor;
 
     measure_callback_t _measure_cb;
+    notify_callback_t  _notify_cb;
+
     SoftwareTimer _timer;
 
     err_t _begin(int32_t ms);
 
     virtual void _update_timer(int32_t ms);
     virtual void _measure_handler(void);
-    virtual void _notify_cb(uint16_t conn_hdl, uint16_t value);
+    virtual void _notify_handler(uint16_t conn_hdl, uint16_t value);
 
     static void sensor_timer_cb(TimerHandle_t xTimer);
     static void sensor_period_write_cb(uint16_t conn_hdl, BLECharacteristic* chr, uint8_t* data, uint16_t len);

variants/clue_nrf52840/variant.h

@@ -43,6 +43,7 @@ extern "C"
 // LEDs
 #define PIN_LED1             (17)
 #define PIN_NEOPIXEL         (18)
+#define PIN_LED2             (43)      // dual white LEDs
 
 #define LED_BUILTIN          PIN_LED1