Diff: main.cpp

Revision:

0:ace2e8d3ce79

Child:

2:ffc5216bd2cc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 29 14:42:22 2013 +0000
@@ -0,0 +1,114 @@
+#include "mbed.h"
+
+#include "uuid.h"
+#include "bleservice.h"
+#include "blecharacteristic.h"
+#include "hw/nrf51822.h"
+
+DigitalOut        myled ( LED1 );
+
+/* Radio HW abstraction layer */
+nRF51822 radio;
+
+/* Battery Level Service */
+/* See --> https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.battery_service.xml */
+BLEService        battService   ( 0x180F );
+BLECharacteristic battLevel     ( 0x2A19, 1, 1, 0x10 | 0x02);   /* Read + Notify */
+
+/* Heart Rate Monitor Service */
+/* See --> https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
+BLEService        hrmService    ( 0x180D );
+BLECharacteristic hrmRate       ( 0x2A37, 2, 3, 0x10 );         /* Notify */
+BLECharacteristic hrmLocation   ( 0x2A39, 1, 1, 0x02 );         /* Read */
+
+/* Health Thermometer Service */
+/* See --> https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.health_thermometer.xml */
+BLEService        thermService  ( 0x1809 );
+BLECharacteristic thermTemp     ( 0x2A1C, 5, 13, 0x20 );         /* Indicate */
+BLECharacteristic thermType     ( 0x2A1D, 1, 1, 0x02 );          /* Read */
+BLECharacteristic thermInterval ( 0x2A21, 2, 2, 0x02 );          /* Read */
+
+/* Notify   = device (server) sends data when it changes */
+/* Indicate = device (server) sends data when it changes and client confirms reception */ 
+ 
+int main()
+{
+    /* Add the battery level characteristic to the battery service          */
+    /* Note: This will also update the characteristic's .index field        */
+    /* so that we know where it's stored in the BLEService.characteristics  */
+    /* array.                                                               */
+    battService.addCharacteristic(battLevel);
+    
+    /* Add the heart rate and sensor location chars to the HRM service      */
+    hrmService.addCharacteristic(hrmRate);
+    hrmService.addCharacteristic(hrmLocation);
+    
+    /* Add the Health Thermometer server characteristics                    */
+    thermService.addCharacteristic(thermTemp);
+    thermService.addCharacteristic(thermType);
+    thermService.addCharacteristic(thermInterval);
+    
+    /* Reset the BLE hardware to make sure we get a clean start             */
+    wait(2);
+    radio.reset();
+    
+    /* Add the services to the radio HAL */
+    radio.addService(battService);
+    radio.addService(hrmService);
+    radio.addService(thermService);
+    
+    /* Start the services so that we can start pushing data out */
+    radio.start();
+
+    /* Set the heart rate monitor location (one time only) */
+    /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
+    uint8_t location = 0x01; /* Chest */
+    radio.updateValue(hrmService.index, hrmLocation.index, (uint8_t*)&location, sizeof(location));
+
+    /* Update the battery level */
+    /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.battery_level.xml */
+    uint8_t batt = 72; /* Percentage (0..100) */
+    radio.updateValue(battService.index, battLevel.index, (uint8_t*)&batt, sizeof(batt));
+
+    /* Update the fixed health thermometer characteristics */
+    /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml */
+    uint8_t thermLocation = 6; /* Location = mouth */
+    radio.updateValue(thermService.index, thermType.index, (uint8_t*)&thermLocation, sizeof(thermLocation));
+    /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.measurement_interval.xml */
+    uint16_t thermDelay = 5;
+    radio.updateValue(thermService.index, thermInterval.index, (uint8_t*)&thermDelay, sizeof(thermDelay));
+    
+    /* Blinky + value updates */
+    uint8_t hrmCounter = 100;
+        
+    while(1)
+    {
+        myled = 1;
+        wait(0.1);
+        myled = 0;
+        wait(0.1);
+                
+        /* Update the HRM measurement */
+        /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
+        /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
+        hrmCounter++;
+        if (hrmCounter == 175) hrmCounter = 100;
+        uint8_t bpm[2] = { 0x00, hrmCounter };
+        radio.updateValue(hrmService.index, hrmRate.index, bpm, 2);
+        
+        /* Update the Health Thermometer measurement */
+        
+        // NOTE: This is an IEEE-11073 32-bit float NOT a IEEE-754 float (standard single precision float type) !!!
+        // See: Section 2.2 of https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=242961
+        // Example:
+        // Consider a temperature measurement of 36.4 degrees Celsius with precision of 0.1 degrees Celsius.
+        // The FLOAT-Type representation is a 32-bit value consisting of an exponent of an 8-bit signed integer
+        // followed by a mantissa of a 24-bit signed integer; here, the exponent is -1 (0xFF) and the mantissa
+        // is 364 (0x00016C). Therefore, the FLOAT-Type representation of 36.4 is 0xFF00016C.
+        
+        uint8_t temperature[5] = { 0x00, 0x00, 0x00, 0x00, 0xFF };
+        // Use the hrm counter to provide a shifting temperature value (175 = 17.5C, etc.)
+        memcpy (temperature+1, &hrmCounter, 1);
+        radio.updateValue(thermService.index, thermTemp.index, temperature, 5);
+    }
+}