Revision 0:3aa044e110b8, committed 2015-10-05

Comitter:

andresag

Date:

Mon Oct 05 12:59:40 2015 +0000

Commit message:

Initial version of a simple BLE temperature gateway that scans temperature broadcasts while simultaneously acting as a peripheral.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BLE_API.lib	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#d494ad3e87bd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TMP_nrf51/TMP_nrf51.cpp	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,31 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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 "TMP_nrf51.h"
+#include "nrf_soc.h" // for internal thermometer sensor
+
+/**
+ * @brief Get the temperature value.
+ *
+ * @return Die temperature in °C
+ */
+TMP_nrf51::TempSensorValue_t TMP_nrf51::get(void)
+{
+    int32_t p_temp;
+    sd_temp_get(&p_temp);
+
+    return ((TempSensorValue_t)p_temp * 0.25); /* 0.25 is temperature sensor resolution */
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TMP_nrf51/TMP_nrf51.h	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,37 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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.
+ */
+
+#ifndef TMP_NRF51_H
+#define TMP_NRF51_H
+
+#include "mbed.h"
+
+//!Library for the nrf51822 internal temperature sensor.
+
+class TMP_nrf51
+{
+public:
+    typedef float TempSensorValue_t;
+
+    /**
+    * @brief Get the temperature value.
+    *
+    * @return Die temperature in °C.
+    */
+    TempSensorValue_t get(void);
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TemperatureGatewayService.h	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,108 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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.
+ */
+
+#ifndef __BLE_TEMP_GATEWAY_SERVICE_H__
+#define __BLE_TEMP_GATEWAY_SERVICE_H__
+
+template <unsigned MAX_BEACONS>
+class TemperatureGatewayService {
+public:
+    /* UUIDs for service and characteristic. Note that the values are not meaningful,
+       but they are convenient for debugging. */
+    const static uint16_t TEMPERATURE_SERVICE_UUID              = 0xFEFF;
+    const static uint16_t TEMPERATURE_LIST_CHARACTERISTIC_UUID  = 0xFAFA;
+
+    TemperatureGatewayService(BLEDevice &_ble) : ble(_ble), tempList(), tempListChar(TEMPERATURE_LIST_CHARACTERISTIC_UUID, tempList.getPointer(), 0, MAX_BEACONS * TemperatureListRepresentation::OFFSET_PER_BEACON, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NONE)
+    {
+        GattCharacteristic *charTable[] = {&tempListChar};
+        GattService         temperatureService(TEMPERATURE_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+        ble.addService(temperatureService);
+    }
+
+    /* Return the characteristic UUID */
+    GattAttribute::Handle_t getValueHandle() const {
+        return tempListChar.getValueHandle();
+    }
+
+    void updateTemperature(uint8_t totalBeacons, uint32_t* beaconIds, float* temperatures) {
+        size_t payloadSize = tempList.updateBytes(totalBeacons, beaconIds, temperatures);
+        /* We want to send the exact number of bytes i.e. 8 * totalBeacons
+        since each beacon has 4 bytes Id and 4 bytes temperature */
+        ble.gattServer().write(tempListChar.getValueHandle(), tempList.getPointer(), payloadSize);
+    }
+
+private:
+    /* Private internal representation for the bytes sent over BLE to the client device */
+    struct TemperatureListRepresentation {
+        static const unsigned OFFSET_PER_BEACON = 2 * sizeof(uint32_t);
+        static const unsigned MIN_PAYLOAD_SIZE = 10;
+
+        TemperatureListRepresentation(void) : bytes() {
+        }
+
+        /* Transform the TemperatureTable into plain bytes */
+        size_t updateBytes(uint8_t totalBeacons, const uint32_t* beaconIds, const float* temperatures) {
+            size_t payloadSize = totalBeacons * OFFSET_PER_BEACON * sizeof(uint8_t);
+            if (payloadSize < MIN_PAYLOAD_SIZE) {
+                payloadSize = MIN_PAYLOAD_SIZE;
+            }
+
+            /* Copy each beacon key-value pair into the array */
+            for (uint32_t i = 0; i < totalBeacons; i++) {
+                    memcpy(&bytes[i * OFFSET_PER_BEACON], &beaconIds[i], sizeof(uint32_t));
+                    uint32_t temp_ieee11073 = quick_ieee11073_from_float(temperatures[i]);
+                    memcpy(&bytes[i * OFFSET_PER_BEACON + sizeof(uint32_t)], &temp_ieee11073 , sizeof(uint32_t));
+            }
+            return payloadSize;
+        }
+
+        uint8_t *getPointer(void) {
+            return bytes;
+        }
+
+        const uint8_t *getPointer(void) const {
+            return bytes;
+        }
+
+private:
+        /**
+         * @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;
+        }
+
+private:
+        /* This array contains the actual bytes to be sent over BLE. However, we send as much data
+           as we need to, not the whole array (unless we reached max capacity.
+           The data is organised as follows:
+                BeaconId0 - Temperature0 - BeaconId1 - Temperature1 -.....- BeaconIdN - TemperatureN
+           Note that each item is composed of 4 bytes. */
+        uint8_t bytes[MAX_BEACONS * OFFSET_PER_BEACON];
+    };
+
+private:
+    BLEDevice                                    &ble;
+    TemperatureListRepresentation                tempList;
+    GattCharacteristic                           tempListChar;
+};
+
+#endif /* #ifndef __BLE_TEMP_GATEWAY_SERVICE_H__ */

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TemperatureTable.h	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,76 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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.
+ */
+
+#ifndef __BLE_TEMPERATURE_TABLE_H__
+#define __BLE_TEMPERATURE_TABLE_H__
+
+template <typename BeaconIDType, typename TemperatureType, unsigned MAX_SIZE>
+class TemperatureTable {
+public:
+    TemperatureTable(void) : totalBeacons(0), hasUpdatedData(true), tempValues(), beaconIds() {
+        /* empty */
+    }
+
+    /* Add temperature to the table IF AND ONLY IF the data is not already there */
+    void addBeacon(BeaconIDType beaconId, TemperatureType temperature) {
+        for (unsigned i = 0; i < totalBeacons; i++) {
+            if (beaconId == beaconIds[i]) {
+                if (tempValues[i] != temperature) { /* Update old temperature value */
+                    tempValues[i]  = temperature;
+                    hasUpdatedData = true;
+                }
+                return;
+            }
+        }
+
+        /* The beacon doesn't exist in the table; add an entry if there is space. */
+        if (totalBeacons < MAX_SIZE) {
+            beaconIds[totalBeacons]  = beaconId;
+            tempValues[totalBeacons] = temperature;
+            totalBeacons++;
+            hasUpdatedData = true;
+        }
+    }
+
+    
+    TemperatureType *getTemperatures(void) {
+        return tempValues;
+    }
+
+    size_t getTotalBeacons(void) const {
+        return totalBeacons;
+    }
+
+    BeaconIDType *getBeaconIds(void) {
+        return beaconIds;
+    }
+
+    bool hasUpdate(void) const {
+        return hasUpdatedData;
+    }
+
+    void resetHasUpdate(void) {
+        hasUpdatedData = false;
+    }
+
+private:
+    size_t          totalBeacons;
+    bool            hasUpdatedData;
+    TemperatureType tempValues[MAX_SIZE];
+    BeaconIDType    beaconIds[MAX_SIZE];
+};
+
+#endif /* #ifndef __BLE_TEMPERATURE_TABLE_H__ */

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,130 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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 "ble/BLE.h"
+#include "ble/services/BatteryService.h"
+#include "ble/services/DeviceInformationService.h"
+
+#include "toolchain.h"
+#include "TMP_nrf51/TMP_nrf51.h"
+#include "TemperatureGatewayService.h"
+#include "TemperatureTable.h"
+
+#define MAX_BEACONS 10
+
+BLE  ble;
+DigitalOut led1(LED1);
+
+TemperatureGatewayService<MAX_BEACONS>* tempGatewayServicePtr;
+TemperatureTable<uint32_t, float, MAX_BEACONS> temperatureTable;
+
+/* Setup device name and new service information */
+const static char     DEVICE_NAME[]        = "TGW1";
+static const uint16_t uuid16_list[]        = {GattService::UUID_HEALTH_THERMOMETER_SERVICE,
+                                              GattService::UUID_DEVICE_INFORMATION_SERVICE};
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
+{
+    ble.gap().startAdvertising(); // restart advertising
+}
+
+void periodicCallback(void)
+{
+    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
+}
+
+void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
+
+    struct AdvertisingData_t {
+        uint8_t                        length; /* doesn't include itself */
+        GapAdvertisingData::DataType_t dataType;
+        uint8_t                        data[0];
+    } PACKED;
+
+    struct ApplicationData_t {
+        uint16_t applicationSpecificId;             /* An ID used to identify temperature value
+                                                       in the manufacture specific AD data field */
+        TMP_nrf51::TempSensorValue_t tmpSensorValue; /* User defined application data */
+    } PACKED;
+
+    /* This ID is not very meaningful, but makes it easy to find the device for debugging */
+    static const uint16_t APP_SPECIFIC_ID_TEST = 0xFEFE;
+
+    /* Search for the manufacturer specific data with matching application-ID */
+    AdvertisingData_t *pAdvData;
+    for (size_t index = 0; index < params->advertisingDataLen; index += (pAdvData->length + 1)) {
+        pAdvData = (AdvertisingData_t *)&params->advertisingData[index];
+
+        if (pAdvData->dataType != GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA) {
+            continue;
+        }
+
+        const ApplicationData_t *pAppData = (const ApplicationData_t *)pAdvData->data;
+        if (pAppData->applicationSpecificId == APP_SPECIFIC_ID_TEST) {
+            uint32_t beaconId = (params->peerAddr[3] << 24) | (params->peerAddr[2] << 16) | (params->peerAddr[1] << 8)  | (params->peerAddr[0]);
+            TMP_nrf51::TempSensorValue_t temperature = (TMP_nrf51::TempSensorValue_t)pAppData->tmpSensorValue;
+
+            /* If new data was added to the table, then update the payload */
+            temperatureTable.addBeacon(beaconId, temperature);
+            if (temperatureTable.hasUpdate()) {
+                tempGatewayServicePtr->updateTemperature(temperatureTable.getTotalBeacons(), temperatureTable.getBeaconIds(), temperatureTable.getTemperatures());
+                temperatureTable.resetHasUpdate();
+            }
+            break;
+        }
+    }
+}
+
+void configureScanTemperature(void)
+{
+    ble.gap().setScanParams(500 /* scan interval */, 200 /* scan window */);
+    ble.gap().startScan(advertisementCallback);
+}
+
+int main(void)
+{
+    /* Blink LED every second to tell whether the app is running */
+    led1 = 1;
+    Ticker ticker;
+    ticker.attach(periodicCallback, 1);
+
+    ble.init();
+
+    configureScanTemperature();
+
+    ble.gap().onDisconnection(disconnectionCallback);
+
+    /* Setup primary service. */
+    TemperatureGatewayService<MAX_BEACONS> temperatureGatewayService(ble);
+    tempGatewayServicePtr = &temperatureGatewayService;
+
+    /* Setup auxiliary service. */
+    DeviceInformationService deviceInfo(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1");
+
+    /* Setup advertising. */
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.gap().setAdvertisingInterval(1000); /* 1000ms */
+    ble.gap().startAdvertising();
+
+    /* infinite loop */
+    while (1) {
+        ble.waitForEvent(); // low power wait for event
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/4f6c30876dfa
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822.lib	Mon Oct 05 12:59:40 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#088f5738bf18