An example BLE Health Thermometer using the mbed BLE API and Nordic NRF51822
Dependencies: BLE_API_Native_blog TMP102 mbed
main.cpp
- Committer:
- donalm
- Date:
- 2014-02-23
- Revision:
- 2:f11df1469db2
- Parent:
- 0:701da26ee5cb
File content as of revision 2:f11df1469db2:
/* mbed Microcontroller Library * Copyright (c) 2006-2014 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 "TMP102.h" #include "nRF51822n.h" nRF51822n nrf; /* BLE radio driver */ TMP102 healthThemometer(p22, p20, 0x90); /* The TMP102 connected to our board */ /* LEDs for indication: */ DigitalOut oneSecondLed(LED1); /* LED1 is toggled every second. */ DigitalOut advertisingStateLed(LED2); /* LED2 is on when we are advertising, otherwise off. */ /* Health Thermometer Service */ uint8_t thermTempPayload[5] = { 0, 0, 0, 0, 0 }; GattService thermService (GattService::UUID_HEALTH_THERMOMETER_SERVICE); GattCharacteristic thermTemp (GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, 5, 5, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE); /* Battery Level Service */ uint8_t batt = 100; /* 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); /* Advertising data and parameters */ GapAdvertisingData advData; GapAdvertisingData scanResponse; GapAdvertisingParams advParams ( GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED ); uint16_t uuid16_list[] = {GattService::UUID_HEALTH_THERMOMETER_SERVICE, GattService::UUID_BATTERY_SERVICE}; uint32_t quick_ieee11073_from_float(float temperature); void updateServiceValues(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) {} virtual void onConnected(void) { advertisingStateLed = 0; } /* When a client device disconnects we need to start advertising again. */ virtual void onDisconnected(void) { nrf.getGap().startAdvertising(advParams); advertisingStateLed = 1; } }; /**************************************************************************/ /*! @brief Program entry point */ /**************************************************************************/ int main(void) { /* Setup blinky led */ oneSecondLed=1; /* Setup an event handler for GAP events i.e. Client/Server connection events. */ nrf.getGap().setEventHandler(new GapEventHandler()); /* Initialise the nRF51822 */ 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::GENERIC_THERMOMETER); nrf.getGap().setAdvertisingData(advData, scanResponse); /* Health Thermometer Service */ thermService.addCharacteristic(thermTemp); nrf.getGattServer().addService(thermService); /* Add the Battery Level service */ battService.addCharacteristic(battLevel); nrf.getGattServer().addService(battService); /* Start advertising (make sure you've added all your data first) */ nrf.getGap().startAdvertising(advParams); advertisingStateLed = 1; for (;;) { /* Now that we're live, update the battery level & temperature characteristics */ updateServiceValues(); wait(1); } } /**************************************************************************/ /*! @brief Ticker callback to switch advertisingStateLed state */ /**************************************************************************/ void updateServiceValues(void) { /* Toggle the one second LEDs */ oneSecondLed = !oneSecondLed; /* Update battery level */ nrf.getGattServer().updateValue(battLevel.handle, (uint8_t*)&batt, sizeof(batt)); /* Decrement the battery level. */ batt <=50 ? batt=100 : batt--;; /* Update the temperature. Note that we need to convert to an ieee11073 format float. */ float temperature = healthThemometer.read(); uint32_t temp_ieee11073 = quick_ieee11073_from_float(temperature); memcpy(thermTempPayload+1, &temp_ieee11073, 4); nrf.getGattServer().updateValue(thermTemp.handle, thermTempPayload, sizeof(thermTempPayload)); } /** * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type. * @param temperature The temperature as a float. * @return The temperature in 11073-20601 FLOAT-Type format. */ uint32_t quick_ieee11073_from_float(float temperature) { uint8_t exponent = 0xFF; //exponent is -1 uint32_t mantissa = (uint32_t)(temperature*10); return ( ((uint32_t)exponent) << 24) | mantissa; }