Revision 0:d01bde90471b, committed 2014-09-02

Comitter:

rgrover1

Date:

Tue Sep 02 10:34:01 2014 +0000

Child:

1:2deb859ed1a3

Commit message:

Initial attempt at a working heatlh-thermometer

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BLE_API.lib	Tue Sep 02 10:34:01 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#189ff241dae1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DHT.lib	Tue Sep 02 10:34:01 2014 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/sam_grove/code/DHT/#df22ddf10d75

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HealthThermometerService.h	Tue Sep 02 10:34:01 2014 +0000
@@ -0,0 +1,116 @@
+/* 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.
+ */
+
+#ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__
+#define __BLE_HEALTH_THERMOMETER_SERVICE_H__
+
+#include "BLEDevice.h"
+
+/* Heart Rate Service */
+/* Service:  https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml */
+/* Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
+/* Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml */
+class HealthThermometerService {
+public:
+    enum {
+        LOCATION_ARMPIT = 1,
+        LOCATION_BODY,
+        LOCATION_EAR,
+        LOCATION_FINGER,
+        LOCATION_GI_TRACT,
+        LOCATION_MOUTH,
+        LOCATION_RECTUM,
+        LOCATION_TOE,
+        LOCATION_EAR_DRUM,
+    };
+
+public:
+
+    /**
+     * @param[in] _ble         reference to the BLE device
+     * @param[in] initialTemp  initial value in celsius
+     * @param[in] _location
+     */
+    HealthThermometerService(BLEDevice &_ble, float initialTemp, uint8_t _location) :
+        ble(_ble),
+        valueBytes(initialTemp),
+        tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, valueBytes.getPointer(),
+                        sizeof(TemperatureValueBytes), sizeof(TemperatureValueBytes),
+                        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
+        tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, (uint8_t *)&_location, sizeof(_location), sizeof(_location),
+                     GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) {
+
+        GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, };
+        GattService         hrmService(GattService::UUID_HEART_RATE_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
+
+        ble.addService(hrmService);
+    }
+
+    void updateTemperature(float temperature) {
+        if (ble.getGapState().connected) {
+            valueBytes.updateTemperature(temperature);
+            ble.updateCharacteristicValue(tempMeasurement.getHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes));
+        }
+    }
+
+private:
+    /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
+    struct TemperatureValueBytes {
+        static const unsigned OFFSET_OF_FLAGS    = 0;
+        static const unsigned OFFSET_OF_VALUE    = OFFSET_OF_FLAGS + sizeof(uint8_t);
+        static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float);
+
+        static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0;
+        static const unsigned TIMESTAMP_FLAG_POS         = 1;
+        static const unsigned TEMPERATURE_TYPE_FLAG_POS  = 2;
+
+        static const uint8_t TEMPERATURE_UNITS_CELSIUS    = 0;
+        static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1;
+
+        TemperatureValueBytes(float initialTemperature) : bytes() {
+            /* assumption: temperature values are expressed in Celsius */
+            bytes[OFFSET_OF_FLAGS] =  (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) |
+                                      (false << TIMESTAMP_FLAG_POS) |
+                                      (false << TEMPERATURE_TYPE_FLAG_POS);
+            updateTemperature(initialTemperature);
+        }
+
+        void updateTemperature(float temp) {
+            memcpy(&bytes[OFFSET_OF_VALUE], &temp, sizeof(float));
+        }
+
+        uint8_t *getPointer(void) {
+            return bytes;
+        }
+
+        const uint8_t *getPointer(void) const {
+            return bytes;
+        }
+
+    private:
+        /* First byte = 8-bit flags, Second field is a float holding the temperature value. */
+        /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
+        uint8_t bytes[SIZEOF_VALUE_BYTES];
+    };
+
+private:
+    BLEDevice             &ble;
+    TemperatureValueBytes  valueBytes;
+    GattCharacteristic     tempMeasurement;
+    GattCharacteristic     tempLocation;
+};
+
+#endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Sep 02 10:34:01 2014 +0000
@@ -0,0 +1,96 @@
+/* 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 "HealthThermometerService.h"
+#include "DHT.h"
+
+BLEDevice  ble;
+DigitalOut led1(LED1);
+DHT        sensor(D10, DHT11);
+
+#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[]        = "Therm";
+static const uint16_t uuid16_list[]        = {GattService::UUID_HEALTH_THERMOMETER_SERVICE};
+static volatile bool  triggerSensorPolling = false;
+
+void disconnectionCallback(Gap::Handle_t handle)
+{
+    DEBUG("Disconnected handle %u!\n\r", handle);
+    DEBUG("Restarting the advertising process\n\r");
+    ble.startAdvertising();
+}
+
+void periodicCallback(void)
+{
+    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
+
+    /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
+     * heavy-weight sensor polling from the main thread. */
+    triggerSensorPolling = true;
+}
+
+int main(void)
+{
+    led1 = 1;
+    Ticker ticker;
+    ticker.attach(periodicCallback, 1);
+
+    DEBUG("Initialising the nRF51822\n\r");
+    ble.init();
+    ble.onDisconnection(disconnectionCallback);
+
+    /* 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::THERMOMETER_EAR);
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.setAdvertisingInterval(1600); /* 1000ms; in multiples of 0.625ms. */
+    ble.startAdvertising();
+
+    float initialTemperature = 39.6;
+    HealthThermometerService thermometerService(ble, initialTemperature, HealthThermometerService::LOCATION_EAR);
+
+    int error = 0;
+    float c = 0.0f;
+
+    while (true) {
+        if (triggerSensorPolling) {
+            triggerSensorPolling = false;
+
+            /* Do blocking calls or whatever is necessary for sensor polling. */
+            /* In our case, we simply update the dummy HRM measurement. */
+            error = sensor.readData();
+            if (!error) {
+                c = sensor.ReadTemperature(CELCIUS);
+                thermometerService.updateTemperature(c);
+            }
+        } else {
+            ble.waitForEvent();
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Sep 02 10:34:01 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/9327015d4013
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822.lib	Tue Sep 02 10:34:01 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#1e5c300cec7f