Diff: main.cpp

Revision:

0:5e4210d108ac

Child:

2:daf2344afc28

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Aug 22 11:27:32 2014 +0000
@@ -0,0 +1,148 @@
+#include "mbed.h"
+#include "TMP102.h"
+#include "BLEDevice.h"
+#include "ble_hts.h"
+
+#define NEED_CONSOLE_OUTPUT 1 /* 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[] = "HRM1017_HTM";
+
+BLEDevice  ble;
+TMP102      healthThemometer(p22, p20, 0x90);  /* The TMP102 connected to our board */
+
+/* LEDs for indication: */
+DigitalOut  oneSecondLed(LED1);        /* LED1 is toggled every second. */
+DigitalOut  advertisingStateLed(LED2); /* LED2 is on when we are advertising, otherwise off. */
+
+
+/* Health Thermometer Service */ 
+uint8_t             thermTempPayload[5] = { 0, 0, 0, 0, 0 };
+
+GattCharacteristic  tempChar (GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR,
+                                thermTempPayload, 5, 5,
+                                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE);
+/* Battery Level Service */
+uint8_t            batt = 100;     /* Battery level */
+uint8_t            read_batt = 0;  /* Variable to hold battery level reads */
+GattCharacteristic battLevel ( GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, 
+                                 (uint8_t *)batt, 1, 1,
+                                 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
+GattCharacteristic *htmChars[] = {&tempChar, };
+GattCharacteristic *battChars[] = {&battLevel, };
+GattService        htmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, htmChars, 
+                                sizeof(htmChars) / sizeof(GattCharacteristic *));
+GattService        battService(GattService::UUID_BATTERY_SERVICE, battChars,
+                                sizeof(battChars) / sizeof(GattCharacteristic *));
+
+uint16_t             uuid16_list[] = {GattService::UUID_HEALTH_THERMOMETER_SERVICE,
+                                      GattService::UUID_BATTERY_SERVICE};
+
+uint32_t quick_ieee11073_from_float(float temperature);
+void updateServiceValues(void);
+
+static Gap::ConnectionParams_t connectionParams;
+
+void disconnectionCallback(Gap::Handle_t handle)
+{
+    advertisingStateLed = 1;
+    
+    DEBUG("Disconnected handle %u!\n\r", handle);
+    DEBUG("Restarting the advertising process\n\r");
+    ble.startAdvertising();
+}
+
+void onConnectionCallback(Gap::Handle_t handle)
+{
+    advertisingStateLed = 0;
+
+    DEBUG("connected. Got handle %u\r\n", handle);
+
+    connectionParams.slaveLatency = 1;
+    if (ble.updateConnectionParams(handle, &connectionParams) != BLE_ERROR_NONE) {
+        DEBUG("failed to update connection paramter\r\n");
+    }
+}
+
+/**************************************************************************/
+/*!
+    @brief  Program entry point
+*/
+/**************************************************************************/
+int main(void)
+{
+    
+    /* Setup blinky led */
+    oneSecondLed = 1;
+    
+    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();
+    advertisingStateLed = 1;
+
+    ble.addService(htmService);
+    ble.addService(battService);
+
+    for (;;)
+    {
+        /* Now that we're live, update the battery level & temperature characteristics */
+        updateServiceValues();
+        wait(1);
+        ble.waitForEvent();
+    }
+}
+
+/**************************************************************************/
+/*!
+    @brief  Ticker callback to switch advertisingStateLed state
+*/
+/**************************************************************************/
+void updateServiceValues(void)
+{
+      /* Toggle the one second LEDs */
+      oneSecondLed = !oneSecondLed;
+      
+      /* Decrement the battery level. */
+      batt <=50 ? batt=100 : batt--;
+      
+      /* Update the temperature. Note that we need to convert to an ieee11073 format float. */
+      float temperature = healthThemometer.read();
+      DEBUG("temp:%f\n", temperature);
+      uint32_t temp_ieee11073 = quick_ieee11073_from_float(temperature);
+      memcpy(thermTempPayload+1, &temp_ieee11073, 4);
+      ble.updateCharacteristicValue(tempChar.getHandle(), thermTempPayload, sizeof(thermTempPayload));
+      ble.updateCharacteristicValue(battLevel.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 = 0xFF; //exponent is -1
+    uint32_t mantissa = (uint32_t)(temperature*10);
+    
+    return ( ((uint32_t)exponent) << 24) | mantissa;
+}
+