main.cpp

00001 #include "mbed.h"
00002 #include "TMP102.h"
00003 #include "BLEDevice.h"
00004 #include "ble_hts.h"
00005 
00006 #define NEED_CONSOLE_OUTPUT 1 /* Set this if you need debug messages on the console;
00007                                * it will have an impact on code-size and power consumption. */
00008 
00009 #if NEED_CONSOLE_OUTPUT
00010 Serial  pc(USBTX, USBRX);
00011 #define DEBUG(...) { pc.printf(__VA_ARGS__); }
00012 #else
00013 #define DEBUG(...) /* nothing */
00014 #endif /* #if NEED_CONSOLE_OUTPUT */
00015 
00016 const static char  DEVICE_NAME[] = "HRM1017_HTM";
00017 
00018 BLEDevice  ble;
00019 TMP102      healthThemometer(p22, p20, 0x90);  /* The TMP102 connected to our board */
00020 
00021 /* LEDs for indication: */
00022 DigitalOut  oneSecondLed(LED1);        /* LED1 is toggled every second. */
00023 DigitalOut  advertisingStateLed(LED2); /* LED2 is on when we are advertising, otherwise off. */
00024 
00025 
00026 /* Health Thermometer Service */ 
00027 uint8_t             thermTempPayload[5] = { 0, 0, 0, 0, 0 };
00028 
00029 GattCharacteristic  tempChar (GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR,
00030                                 thermTempPayload, 5, 5,
00031                                 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE);
00032 /* Battery Level Service */
00033 uint8_t            batt = 100;     /* Battery level */
00034 uint8_t            read_batt = 0;  /* Variable to hold battery level reads */
00035 GattCharacteristic battLevel ( GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, 
00036                                  (uint8_t *)batt, 1, 1,
00037                                  GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
00038 GattCharacteristic *htmChars[] = {&tempChar, };
00039 GattCharacteristic *battChars[] = {&battLevel, };
00040 GattService        htmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, htmChars, 
00041                                 sizeof(htmChars) / sizeof(GattCharacteristic *));
00042 GattService        battService(GattService::UUID_BATTERY_SERVICE, battChars,
00043                                 sizeof(battChars) / sizeof(GattCharacteristic *));
00044 
00045 uint16_t             uuid16_list[] = {GattService::UUID_HEALTH_THERMOMETER_SERVICE,
00046                                       GattService::UUID_BATTERY_SERVICE};
00047 
00048 uint32_t quick_ieee11073_from_float(float temperature);
00049 void updateServiceValues(void);
00050 
00051 static Gap::ConnectionParams_t connectionParams;
00052 
00053 void disconnectionCallback(Gap::Handle_t handle)
00054 {
00055     advertisingStateLed = 1;
00056     
00057     DEBUG("Disconnected handle %u!\n\r", handle);
00058     DEBUG("Restarting the advertising process\n\r");
00059     ble.startAdvertising();
00060 }
00061 
00062 void onConnectionCallback(Gap::Handle_t handle)
00063 {
00064     advertisingStateLed = 0;
00065 
00066     DEBUG("connected. Got handle %u\r\n", handle);
00067 
00068     connectionParams.slaveLatency = 1;
00069     if (ble.updateConnectionParams(handle, &connectionParams) != BLE_ERROR_NONE) {
00070         DEBUG("failed to update connection paramter\r\n");
00071     }
00072 }
00073 
00074 /**************************************************************************/
00075 /*!
00076     @brief  Program entry point
00077 */
00078 /**************************************************************************/
00079 int main(void)
00080 {
00081     
00082     /* Setup blinky led */
00083     oneSecondLed = 1;
00084     
00085     DEBUG("Initialising the nRF51822\n\r");
00086     ble.init();
00087     ble.onDisconnection(disconnectionCallback);
00088     ble.onConnection(onConnectionCallback);
00089 
00090     ble.getPreferredConnectionParams(&connectionParams);
00091 
00092     /* setup advertising */
00093     ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
00094     ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t*)uuid16_list, sizeof(uuid16_list));
00095     ble.accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_THERMOMETER);
00096     ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
00097     ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
00098     ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
00099     ble.startAdvertising();
00100     advertisingStateLed = 1;
00101 
00102     ble.addService(htmService);
00103     ble.addService(battService);
00104 
00105     for (;;)
00106     {
00107         /* Now that we're live, update the battery level & temperature characteristics */
00108         updateServiceValues();
00109         wait(1);
00110         ble.waitForEvent();
00111     }
00112 }
00113 
00114 /**************************************************************************/
00115 /*!
00116     @brief  Ticker callback to switch advertisingStateLed state
00117 */
00118 /**************************************************************************/
00119 void updateServiceValues(void)
00120 {
00121       /* Toggle the one second LEDs */
00122       oneSecondLed = !oneSecondLed;
00123       
00124       /* Decrement the battery level. */
00125       batt <=50 ? batt=100 : batt--;
00126       
00127       /* Update the temperature. Note that we need to convert to an ieee11073 format float. */
00128       float temperature = healthThemometer.read();
00129       DEBUG("temp:%f\n", temperature);
00130       uint32_t temp_ieee11073 = quick_ieee11073_from_float(temperature);
00131       memcpy(thermTempPayload+1, &temp_ieee11073, 4);
00132       ble.updateCharacteristicValue(tempChar.getHandle(), thermTempPayload, sizeof(thermTempPayload));
00133       ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
00134 }
00135 
00136 /**
00137  * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type.
00138  * @param temperature The temperature as a float.
00139  * @return The temperature in 11073-20601 FLOAT-Type format.
00140  */
00141 uint32_t quick_ieee11073_from_float(float temperature)
00142 {
00143     uint8_t  exponent = 0xFF; //exponent is -1
00144     uint32_t mantissa = (uint32_t)(temperature*10);
00145     
00146     return ( ((uint32_t)exponent) << 24) | mantissa;
00147 }
00148