An example BLE Health Thermometer using the mbed BLE API and Nordic NRF51822
Dependencies: BLE_API_Native_blog TMP102 mbed
main.cpp@2:f11df1469db2, 2014-02-23 (annotated)
- Committer:
- donalm
- Date:
- Sun Feb 23 14:39:55 2014 +0000
- Revision:
- 2:f11df1469db2
- Parent:
- 0:701da26ee5cb
Some tidy up while writing the blog.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
donalm | 0:701da26ee5cb | 1 | /* mbed Microcontroller Library |
donalm | 0:701da26ee5cb | 2 | * Copyright (c) 2006-2014 ARM Limited |
donalm | 0:701da26ee5cb | 3 | * |
donalm | 0:701da26ee5cb | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
donalm | 0:701da26ee5cb | 5 | * you may not use this file except in compliance with the License. |
donalm | 0:701da26ee5cb | 6 | * You may obtain a copy of the License at |
donalm | 0:701da26ee5cb | 7 | * |
donalm | 0:701da26ee5cb | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
donalm | 0:701da26ee5cb | 9 | * |
donalm | 0:701da26ee5cb | 10 | * Unless required by applicable law or agreed to in writing, software |
donalm | 0:701da26ee5cb | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
donalm | 0:701da26ee5cb | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
donalm | 0:701da26ee5cb | 13 | * See the License for the specific language governing permissions and |
donalm | 0:701da26ee5cb | 14 | * limitations under the License. |
donalm | 0:701da26ee5cb | 15 | */ |
donalm | 0:701da26ee5cb | 16 | |
donalm | 0:701da26ee5cb | 17 | #include "mbed.h" |
donalm | 0:701da26ee5cb | 18 | #include "TMP102.h" |
donalm | 0:701da26ee5cb | 19 | #include "nRF51822n.h" |
donalm | 0:701da26ee5cb | 20 | |
donalm | 0:701da26ee5cb | 21 | nRF51822n nrf; /* BLE radio driver */ |
donalm | 0:701da26ee5cb | 22 | TMP102 healthThemometer(p22, p20, 0x90); /* The TMP102 connected to our board */ |
donalm | 0:701da26ee5cb | 23 | |
donalm | 2:f11df1469db2 | 24 | /* LEDs for indication: */ |
donalm | 2:f11df1469db2 | 25 | DigitalOut oneSecondLed(LED1); /* LED1 is toggled every second. */ |
donalm | 2:f11df1469db2 | 26 | DigitalOut advertisingStateLed(LED2); /* LED2 is on when we are advertising, otherwise off. */ |
donalm | 0:701da26ee5cb | 27 | |
donalm | 0:701da26ee5cb | 28 | |
donalm | 0:701da26ee5cb | 29 | /* Health Thermometer Service */ |
donalm | 0:701da26ee5cb | 30 | uint8_t thermTempPayload[5] = { 0, 0, 0, 0, 0 }; |
donalm | 0:701da26ee5cb | 31 | GattService thermService (GattService::UUID_HEALTH_THERMOMETER_SERVICE); |
donalm | 0:701da26ee5cb | 32 | GattCharacteristic thermTemp (GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, |
donalm | 0:701da26ee5cb | 33 | 5, 5, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE); |
donalm | 0:701da26ee5cb | 34 | |
donalm | 0:701da26ee5cb | 35 | /* Battery Level Service */ |
donalm | 0:701da26ee5cb | 36 | uint8_t batt = 100; /* Battery level */ |
donalm | 0:701da26ee5cb | 37 | uint8_t read_batt = 0; /* Variable to hold battery level reads */ |
donalm | 0:701da26ee5cb | 38 | GattService battService ( GattService::UUID_BATTERY_SERVICE ); |
donalm | 0:701da26ee5cb | 39 | GattCharacteristic battLevel ( GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, 1, 1, |
donalm | 0:701da26ee5cb | 40 | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY | |
donalm | 0:701da26ee5cb | 41 | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ); |
donalm | 0:701da26ee5cb | 42 | |
donalm | 0:701da26ee5cb | 43 | |
donalm | 0:701da26ee5cb | 44 | /* Advertising data and parameters */ |
donalm | 0:701da26ee5cb | 45 | GapAdvertisingData advData; |
donalm | 0:701da26ee5cb | 46 | GapAdvertisingData scanResponse; |
donalm | 0:701da26ee5cb | 47 | GapAdvertisingParams advParams ( GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED ); |
donalm | 2:f11df1469db2 | 48 | |
donalm | 0:701da26ee5cb | 49 | uint16_t uuid16_list[] = {GattService::UUID_HEALTH_THERMOMETER_SERVICE, |
donalm | 0:701da26ee5cb | 50 | GattService::UUID_BATTERY_SERVICE}; |
donalm | 0:701da26ee5cb | 51 | |
donalm | 0:701da26ee5cb | 52 | uint32_t quick_ieee11073_from_float(float temperature); |
donalm | 0:701da26ee5cb | 53 | void updateServiceValues(void); |
donalm | 0:701da26ee5cb | 54 | |
donalm | 0:701da26ee5cb | 55 | /**************************************************************************/ |
donalm | 0:701da26ee5cb | 56 | /*! |
donalm | 0:701da26ee5cb | 57 | @brief This custom class can be used to override any GapEvents |
donalm | 0:701da26ee5cb | 58 | that you are interested in handling on an application level. |
donalm | 0:701da26ee5cb | 59 | */ |
donalm | 0:701da26ee5cb | 60 | /**************************************************************************/ |
donalm | 0:701da26ee5cb | 61 | class GapEventHandler : public GapEvents |
donalm | 0:701da26ee5cb | 62 | { |
donalm | 2:f11df1469db2 | 63 | //virtual void onTimeout(void) {} |
donalm | 2:f11df1469db2 | 64 | |
donalm | 0:701da26ee5cb | 65 | virtual void onConnected(void) |
donalm | 0:701da26ee5cb | 66 | { |
donalm | 2:f11df1469db2 | 67 | advertisingStateLed = 0; |
donalm | 0:701da26ee5cb | 68 | } |
donalm | 0:701da26ee5cb | 69 | |
donalm | 2:f11df1469db2 | 70 | /* When a client device disconnects we need to start advertising again. */ |
donalm | 0:701da26ee5cb | 71 | virtual void onDisconnected(void) |
donalm | 0:701da26ee5cb | 72 | { |
donalm | 0:701da26ee5cb | 73 | nrf.getGap().startAdvertising(advParams); |
donalm | 2:f11df1469db2 | 74 | advertisingStateLed = 1; |
donalm | 0:701da26ee5cb | 75 | } |
donalm | 0:701da26ee5cb | 76 | }; |
donalm | 0:701da26ee5cb | 77 | |
donalm | 0:701da26ee5cb | 78 | /**************************************************************************/ |
donalm | 0:701da26ee5cb | 79 | /*! |
donalm | 0:701da26ee5cb | 80 | @brief Program entry point |
donalm | 0:701da26ee5cb | 81 | */ |
donalm | 0:701da26ee5cb | 82 | /**************************************************************************/ |
donalm | 0:701da26ee5cb | 83 | int main(void) |
donalm | 0:701da26ee5cb | 84 | { |
donalm | 2:f11df1469db2 | 85 | |
donalm | 2:f11df1469db2 | 86 | /* Setup blinky led */ |
donalm | 2:f11df1469db2 | 87 | oneSecondLed=1; |
donalm | 0:701da26ee5cb | 88 | |
donalm | 2:f11df1469db2 | 89 | /* Setup an event handler for GAP events i.e. Client/Server connection events. */ |
donalm | 0:701da26ee5cb | 90 | nrf.getGap().setEventHandler(new GapEventHandler()); |
donalm | 2:f11df1469db2 | 91 | |
donalm | 0:701da26ee5cb | 92 | /* Initialise the nRF51822 */ |
donalm | 0:701da26ee5cb | 93 | nrf.init(); |
donalm | 0:701da26ee5cb | 94 | |
donalm | 0:701da26ee5cb | 95 | /* Make sure we get a clean start */ |
donalm | 0:701da26ee5cb | 96 | nrf.reset(); |
donalm | 0:701da26ee5cb | 97 | |
donalm | 0:701da26ee5cb | 98 | /* Add BLE-Only flag and complete service list to the advertising data */ |
donalm | 0:701da26ee5cb | 99 | advData.addFlags(GapAdvertisingData::BREDR_NOT_SUPPORTED); |
donalm | 0:701da26ee5cb | 100 | advData.addData(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, |
donalm | 0:701da26ee5cb | 101 | (uint8_t*)uuid16_list, sizeof(uuid16_list)); |
donalm | 0:701da26ee5cb | 102 | advData.addAppearance(GapAdvertisingData::GENERIC_THERMOMETER); |
donalm | 0:701da26ee5cb | 103 | nrf.getGap().setAdvertisingData(advData, scanResponse); |
donalm | 0:701da26ee5cb | 104 | |
donalm | 0:701da26ee5cb | 105 | /* Health Thermometer Service */ |
donalm | 0:701da26ee5cb | 106 | thermService.addCharacteristic(thermTemp); |
donalm | 0:701da26ee5cb | 107 | nrf.getGattServer().addService(thermService); |
donalm | 0:701da26ee5cb | 108 | |
donalm | 0:701da26ee5cb | 109 | /* Add the Battery Level service */ |
donalm | 0:701da26ee5cb | 110 | battService.addCharacteristic(battLevel); |
donalm | 0:701da26ee5cb | 111 | nrf.getGattServer().addService(battService); |
donalm | 0:701da26ee5cb | 112 | |
donalm | 0:701da26ee5cb | 113 | /* Start advertising (make sure you've added all your data first) */ |
donalm | 0:701da26ee5cb | 114 | nrf.getGap().startAdvertising(advParams); |
donalm | 2:f11df1469db2 | 115 | advertisingStateLed = 1; |
donalm | 0:701da26ee5cb | 116 | |
donalm | 0:701da26ee5cb | 117 | for (;;) |
donalm | 0:701da26ee5cb | 118 | { |
donalm | 2:f11df1469db2 | 119 | /* Now that we're live, update the battery level & temperature characteristics */ |
donalm | 2:f11df1469db2 | 120 | updateServiceValues(); |
donalm | 0:701da26ee5cb | 121 | wait(1); |
donalm | 0:701da26ee5cb | 122 | } |
donalm | 0:701da26ee5cb | 123 | } |
donalm | 0:701da26ee5cb | 124 | |
donalm | 0:701da26ee5cb | 125 | /**************************************************************************/ |
donalm | 0:701da26ee5cb | 126 | /*! |
donalm | 2:f11df1469db2 | 127 | @brief Ticker callback to switch advertisingStateLed state |
donalm | 0:701da26ee5cb | 128 | */ |
donalm | 0:701da26ee5cb | 129 | /**************************************************************************/ |
donalm | 0:701da26ee5cb | 130 | void updateServiceValues(void) |
donalm | 0:701da26ee5cb | 131 | { |
donalm | 2:f11df1469db2 | 132 | /* Toggle the one second LEDs */ |
donalm | 2:f11df1469db2 | 133 | oneSecondLed = !oneSecondLed; |
donalm | 0:701da26ee5cb | 134 | |
donalm | 0:701da26ee5cb | 135 | /* Update battery level */ |
donalm | 0:701da26ee5cb | 136 | nrf.getGattServer().updateValue(battLevel.handle, (uint8_t*)&batt, sizeof(batt)); |
donalm | 2:f11df1469db2 | 137 | /* Decrement the battery level. */ |
donalm | 2:f11df1469db2 | 138 | batt <=50 ? batt=100 : batt--;; |
donalm | 0:701da26ee5cb | 139 | |
donalm | 2:f11df1469db2 | 140 | /* Update the temperature. Note that we need to convert to an ieee11073 format float. */ |
donalm | 0:701da26ee5cb | 141 | float temperature = healthThemometer.read(); |
donalm | 0:701da26ee5cb | 142 | uint32_t temp_ieee11073 = quick_ieee11073_from_float(temperature); |
donalm | 0:701da26ee5cb | 143 | memcpy(thermTempPayload+1, &temp_ieee11073, 4); |
donalm | 0:701da26ee5cb | 144 | nrf.getGattServer().updateValue(thermTemp.handle, thermTempPayload, sizeof(thermTempPayload)); |
donalm | 0:701da26ee5cb | 145 | } |
donalm | 0:701da26ee5cb | 146 | |
donalm | 0:701da26ee5cb | 147 | /** |
donalm | 0:701da26ee5cb | 148 | * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type. |
donalm | 0:701da26ee5cb | 149 | * @param temperature The temperature as a float. |
donalm | 0:701da26ee5cb | 150 | * @return The temperature in 11073-20601 FLOAT-Type format. |
donalm | 0:701da26ee5cb | 151 | */ |
donalm | 0:701da26ee5cb | 152 | uint32_t quick_ieee11073_from_float(float temperature) |
donalm | 0:701da26ee5cb | 153 | { |
donalm | 0:701da26ee5cb | 154 | uint8_t exponent = 0xFF; //exponent is -1 |
donalm | 0:701da26ee5cb | 155 | uint32_t mantissa = (uint32_t)(temperature*10); |
donalm | 0:701da26ee5cb | 156 | |
donalm | 0:701da26ee5cb | 157 | return ( ((uint32_t)exponent) << 24) | mantissa; |
donalm | 2:f11df1469db2 | 158 | } |
donalm | 2:f11df1469db2 | 159 |