Diff: main.cpp

Revision:

0:1865c1b765f4

Child:

2:97bfd761b6c3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Dec 06 08:46:12 2014 +0000
@@ -0,0 +1,189 @@
+/* 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 "BLEDevice.h"
+#include "ble_hrs.h"
+#include "ble_hts.h"
+
+#include "nrf_soc.h" // for internal Thermo sensoer
+
+// nRF51822n   nrf;                               /* BLE radio driver */
+BLEDevice  ble;
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+uint8_t cnt;
+
+#define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console;
+                               * it will have an impact on code-size and power consumption. */
+
+#if NEED_CONSOLE_OUTPUT
+Serial  pc(USBTX, USBRX);
+#define DEBUG(...) { pc.printf(__VA_ARGS__); }
+#else
+#define DEBUG(...) /* nothing */
+#endif /* #if NEED_CONSOLE_OUTPUT */
+
+const static char  DEVICE_NAME[] = "BLEnano-HTM";
+
+/* Health Thermometer Service */ 
+/* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.health_thermometer.xml */
+/* HTM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
+uint8_t             thermTempPayload[5] = { 0, 0, 0, 0, 0 };
+
+GattCharacteristic  tempChar (GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR,
+                                thermTempPayload, sizeof(thermTempPayload), sizeof(thermTempPayload),
+                                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE);
+GattCharacteristic *htmChars[] = {&tempChar, };
+GattService        htmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, htmChars, 
+                                sizeof(htmChars) / sizeof(GattCharacteristic *));
+/* Battery Level Service */
+uint8_t            batt = 98;     /* Battery level */
+uint8_t            read_batt = 0; /* Variable to hold battery level reads */
+static uint8_t bpm2[1] = {batt};
+GattCharacteristic battLevel   ( GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, bpm2, sizeof(bpm2), sizeof(bpm2),
+                                 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY |
+                                 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
+GattCharacteristic *battChars[] = {&battLevel, };
+GattService        battService(GattService::UUID_BATTERY_SERVICE, battChars, sizeof(battChars) / sizeof(GattCharacteristic *));
+
+static const uint16_t uuid16_list[] = {GattService::UUID_HEALTH_THERMOMETER_SERVICE, GattService::UUID_BATTERY_SERVICE, GattService::UUID_HEALTH_THERMOMETER_SERVICE + 0x1000 };
+
+static volatile bool triggerSensorPolling = false; /* set to high periodically to indicate to the main thread that
+                                                    * polling is necessary. */
+static Gap::ConnectionParams_t connectionParams;
+
+uint32_t quick_ieee11073_from_float(float temperature);
+
+void Update_Values();
+
+void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)    // Mod
+{
+    DEBUG("Disconnected handle %u!\n\r", handle);
+    DEBUG("Restarting the advertising process\n\r");
+    led2 = 0;
+    ble.startAdvertising();
+
+}
+
+void onConnectionCallback(Gap::Handle_t handle,Gap::addr_type_t peerAddrType, const Gap::address_t peerAddr, const Gap::ConnectionParams_t *params)   //Mod
+{
+    DEBUG("connected. Got handle %u\r\n", handle);
+
+    connectionParams.slaveLatency = 1;
+    led2 = 1;
+    if (ble.updateConnectionParams(handle, &connectionParams) != BLE_ERROR_NONE) {
+        DEBUG("failed to update connection paramter\r\n");
+    }
+    
+}
+
+/**
+ * Triggered periodically by the 'ticker' interrupt.
+ */
+void periodicCallback(void)
+{
+
+    led1 = !led1;
+    triggerSensorPolling = true;
+        
+    // triggerSensorPolling = true; /* Note that the periodicCallback() executes in
+    //                              * interrupt context, so it is safer to do
+    //                              * heavy-weight sensor polling from the main
+    //                              * thread.*/
+}
+
+int main(void)
+{
+    led1 = 1;
+    led2 = 1;
+    wait(3);
+
+    led1 = 0;
+    led2 = 0;
+    Ticker ticker;
+    ticker.attach(periodicCallback, 1.0 );
+    DEBUG("Initialising the nRF51822\n\r");
+    ble.init();
+    ble.onDisconnection(disconnectionCallback);
+    ble.onConnection(onConnectionCallback);
+
+    ble.getPreferredConnectionParams(&connectionParams);
+
+    /* setup advertising */
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t*)uuid16_list, sizeof(uuid16_list));
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_THERMOMETER);
+
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+
+    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
+    ble.startAdvertising();
+
+    ble.addService(htmService);
+    ble.addService(battService);
+
+    while (true) {
+        if (triggerSensorPolling) {
+            triggerSensorPolling = false;
+
+            Update_Values();
+            
+        } else {
+            ble.waitForEvent();
+        }
+    }
+}
+
+void Update_Values()
+{
+    /* Update the temperature. Note that we need to convert to an ieee11073 format float. */
+
+    int32_t p_temp;
+    sd_temp_get(&p_temp);
+    float temperature = float(p_temp)/4.;
+    temperature -= 16.;
+           
+    DEBUG("temp:%f\n\r", temperature);
+    uint32_t temp_ieee11073 = quick_ieee11073_from_float(temperature);
+    memcpy(thermTempPayload+1, &temp_ieee11073, 4);
+
+    /* Battery Service Update */
+    /* Update battery level */
+    //ble.getGattServer().updateValue(battLevel.handle, (uint8_t*)&batt, sizeof(batt));
+    /* Decrement the battery level. */
+    batt <=50 ? batt=100 : batt--;;
+    bpm2[0] = batt;
+
+    if (ble.getGapState().connected ) {
+        ble.updateCharacteristicValue(tempChar.getValueAttribute().getHandle(), thermTempPayload, sizeof(thermTempPayload));
+        ble.updateCharacteristicValue(battLevel.getValueAttribute().getHandle(), (uint8_t *)&batt, sizeof(batt));
+    }
+}
+
+/**
+ * @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 = 0xFE; //exponent is -2
+    uint32_t mantissa = (uint32_t)(temperature*100);
+    
+    return ( ((uint32_t)exponent) << 24) | mantissa;
+}