heart rate monitor

Dependencies:   BLE_API GroveEarbudSensor mbed nRF51822

Fork of BLE_HeartRate by Bluetooth Low Energy

Revision:
0:87a7fc231fae
Child:
3:24e2b056d229
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Mar 31 10:28:28 2014 +0000
@@ -0,0 +1,214 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mbed.h"
+#include "nRF51822n.h"
+
+nRF51822n   nrf;                /* BLE radio driver */
+
+DigitalOut  led1(LED1);
+DigitalOut  led2(LED2);
+Ticker      flipper;
+Serial      pc(USBTX,USBRX);
+
+/* Battery Level Service */
+uint8_t            batt = 72;     /* Battery level */
+uint8_t            read_batt = 0; /* Variable to hold battery level reads */
+GattService        battService ( GattService::UUID_BATTERY_SERVICE );
+GattCharacteristic battLevel   ( GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, 1, 1,
+                                 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY |
+                                 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
+
+/* Heart Rate Service */
+/* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
+/* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
+/* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
+GattService        hrmService    ( GattService::UUID_HEART_RATE_SERVICE );
+GattCharacteristic hrmRate       ( GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, 2, 3, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY );
+GattCharacteristic hrmLocation   ( GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, 1, 1, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ );
+
+/* Device Information service */
+uint8_t            deviceName[4] = { 'm', 'b', 'e', 'd' };
+GattService        deviceInformationService ( GattService::UUID_DEVICE_INFORMATION_SERVICE );
+GattCharacteristic deviceManufacturer ( GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
+                                        sizeof(deviceName), sizeof(deviceName),
+                                        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
+
+/* Advertising data and parameters */
+GapAdvertisingData   advData;
+GapAdvertisingData   scanResponse;
+GapAdvertisingParams advParams ( GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED );
+uint16_t             uuid16_list[] = { GattService::UUID_BATTERY_SERVICE, 
+                                       GattService::UUID_DEVICE_INFORMATION_SERVICE,
+                                       GattService::UUID_HEART_RATE_SERVICE };
+
+void tickerCallback(void);
+
+/**************************************************************************/
+/*!
+    @brief  This custom class can be used to override any GapEvents
+            that you are interested in handling on an application level.
+*/
+/**************************************************************************/
+class GapEventHandler : public GapEvents
+{
+    virtual void onTimeout(void) 
+    {
+        pc.printf("Advertising Timeout!\n\r");
+        // Restart the advertising process with a much slower interval,
+        // only start advertising again after a button press, etc.
+    }    
+
+    virtual void onConnected(void)
+    {
+        pc.printf("Connected!\n\r");
+    }
+
+    virtual void onDisconnected(void)
+    {
+        pc.printf("Disconnected!\n\r");
+        pc.printf("Restarting the advertising process\n\r");
+        nrf.getGap().startAdvertising(advParams);
+    }
+};
+
+/**************************************************************************/
+/*!
+    @brief  This custom class can be used to override any GattServerEvents
+            that you are interested in handling on an application level.
+*/
+/**************************************************************************/
+class GattServerEventHandler : public GattServerEvents
+{
+    //virtual void onDataSent(uint16_t charHandle) {}
+    //virtual void onDataWritten(uint16_t charHandle) {}
+    
+    virtual void onUpdatesEnabled(uint16_t charHandle)
+    {
+      if (charHandle == hrmRate.handle)
+      {
+        pc.printf("Heart rate notify enabled\n\r");
+      }
+    }
+
+    virtual void onUpdatesDisabled(uint16_t charHandle)
+    {
+      if (charHandle == hrmRate.handle)
+      {
+        pc.printf("Heart rate notify disabled\n\r");
+      }
+    }
+
+    //virtual void onConfirmationReceived(uint16_t charHandle) {}
+};
+
+/**************************************************************************/
+/*!
+    @brief  Program entry point
+*/
+/**************************************************************************/
+int main(void)
+{
+    *(uint32_t *)0x40000504 = 0xC007FFDF;
+    *(uint32_t *)0x40006C18 = 0x00008000;
+    
+    /* Setup blinky: led1 is toggled in main, led2 is toggled via Ticker */
+    led1=1;
+    led2=1;
+    flipper.attach(&tickerCallback, 1.0);
+
+    /* Setup the local GAP/GATT event handlers */
+    nrf.getGap().setEventHandler(new GapEventHandler());
+    nrf.getGattServer().setEventHandler(new GattServerEventHandler());
+
+    /* Initialise the nRF51822 */
+    pc.printf("Initialising the nRF51822\n\r");
+    nrf.init();
+
+    /* Make sure we get a clean start */
+    nrf.reset();
+
+    /* Add BLE-Only flag and complete service list to the advertising data */
+    advData.addFlags(GapAdvertisingData::BREDR_NOT_SUPPORTED);
+    advData.addData(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, 
+                   (uint8_t*)uuid16_list, sizeof(uuid16_list));
+    advData.addAppearance(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
+    nrf.getGap().setAdvertisingData(advData, scanResponse);
+
+    /* Add the Battery Level service */
+    battService.addCharacteristic(battLevel);
+    nrf.getGattServer().addService(battService);
+
+    /* Add the Device Information service */
+    deviceInformationService.addCharacteristic(deviceManufacturer);
+    nrf.getGattServer().addService(deviceInformationService);
+    
+    /* Add the Heart Rate service */
+    hrmService.addCharacteristic(hrmRate);
+    hrmService.addCharacteristic(hrmLocation);
+    nrf.getGattServer().addService(hrmService);
+    
+    /* Start advertising (make sure you've added all your data first) */
+    nrf.getGap().startAdvertising(advParams);
+    
+    /* Wait until we are connected to a central device before updating anything */
+    pc.printf("Waiting for a connection ...");
+    while(!nrf.getGap().state.connected)
+    {
+    }
+    pc.printf("Connected!\n\r");
+    
+    /* Now that we're live, update the battery level characteristic, and */
+    /* change the device manufacturer characteristic to 'mbed' */
+    nrf.getGattServer().updateValue(battLevel.handle, (uint8_t*)&batt, sizeof(batt));
+    nrf.getGattServer().updateValue(deviceManufacturer.handle, deviceName, sizeof(deviceName));
+
+    /* Set the heart rate monitor location (one time only) */
+    /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
+    uint8_t location = 0x03; /* Finger */
+    uint8_t hrmCounter = 100;
+    nrf.getGattServer().updateValue(hrmLocation.handle, (uint8_t*)&location, sizeof(location));
+
+    /* Do blinky on LED1 while we're waiting for BLE events */
+    for (;;)
+    {
+      led1 = !led1;
+      wait(1);
+      
+      /* Update battery level */
+      batt++;
+      if (batt > 100) batt = 72;
+      nrf.getGattServer().updateValue(battLevel.handle, (uint8_t*)&batt, sizeof(batt));
+
+      /* Update the HRM measurement */
+      /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
+      /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
+      hrmCounter++;
+      if (hrmCounter == 175) hrmCounter = 100;
+      uint8_t bpm[2] = { 0x00, hrmCounter };
+      nrf.getGattServer().updateValue(hrmRate.handle, bpm, sizeof(bpm));
+    }
+}
+
+/**************************************************************************/
+/*!
+    @brief  Ticker callback to switch led2 state
+*/
+/**************************************************************************/
+void tickerCallback(void)
+{
+    led2 = !led2;
+}