Diff: main.cpp

Revision:

0:b1c537c3190b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jan 25 11:24:21 2016 +0000
@@ -0,0 +1,224 @@
+/*
+ * nRF51-DK BLEDevice service/characteristic (read/write) using mbed.org
+ */
+
+// uncomment if not interested in a console log
+#define CONSOLE_LOG 
+
+#include "mbed.h"
+#include "ble/BLE.h"
+
+//-------------------------------------------------------------------------
+
+#ifdef CONSOLE_LOG
+#define INFO(x, ...)    printf(x,        ##__VA_ARGS__);
+#define INFO_NL(x, ...) printf(x "\r\n", ##__VA_ARGS__);
+#else
+#define INFO(x, ...)    
+#define INFO_NL(x, ...) 
+#endif
+
+// a little routine to print a 128-bit UUID nicely
+void INFO_UUID(const char *prefix, UUID uuid)
+{
+   uint8_t *p = (uint8_t *)uuid.getBaseUUID();
+   INFO("%s: ", prefix);
+   for (int i=0; i<16; i++)
+   {
+     INFO("%02x", p[i]);
+     if ((i == 3) || (i == 5) || (i == 7) || (i == 9)) INFO("-");
+   }
+   INFO_NL("");
+}
+
+//-------------------------------------------------------------------------
+
+// name of the device 
+const static char DEVICE_NAME[] = "nRF51-DK";
+
+// GATT service and characteristic UUIDs
+const UUID nRF51_GATT_SERVICE     = UUID((uint8_t *)"nRF51-DK        ");
+const UUID nRF51_GATT_CHAR_BUTTON = UUID((uint8_t *)"nRF51-DK button ");
+const UUID nRF51_GATT_CHAR_LED    = UUID((uint8_t *)"nRF51-DK led    ");
+
+#define CHARACTERISTIC_BUTTON 0
+#define CHARACTERISTIC_LED    1
+#define CHARACTERISTIC_COUNT  2
+
+// our bluetooth smart objects
+BLE                ble;
+GattService        *gatt_service;
+GattCharacteristic *gatt_characteristics[CHARACTERISTIC_COUNT];
+uint8_t             gatt_char_value[CHARACTERISTIC_COUNT];
+
+#ifdef CONSOLE_LOG
+Serial pc(USBTX,USBRX);
+#endif
+
+//-------------------------------------------------------------------------
+// button handling
+//-------------------------------------------------------------------------
+
+// define our digital in values we will be using for the characteristic
+DigitalIn button1(P0_17);
+DigitalIn button2(P0_18);
+DigitalIn button3(P0_19);
+DigitalIn button4(P0_20);
+
+uint8_t button_new_value = 0;
+uint8_t button_old_value = button_new_value;
+
+void monitorButtons() 
+{
+    // read in the buttons, mapped into nibble (0000 = all off, 1111 = all on)
+    button_new_value = 0;
+    button_new_value |= (button1.read() != 1); button_new_value <<= 1;
+    button_new_value |= (button2.read() != 1); button_new_value <<= 1;
+    button_new_value |= (button3.read() != 1); button_new_value <<= 1;
+    button_new_value |= (button4.read() != 1); 
+      
+    // set the updated value of the characteristic if data has changed
+    if (button_new_value != button_old_value)
+    {
+        ble.updateCharacteristicValue(
+              gatt_characteristics[CHARACTERISTIC_BUTTON] -> getValueHandle(),
+              &button_new_value, sizeof(button_new_value));
+        button_old_value = button_new_value;
+
+        INFO_NL("  button state: [0x%02x]", button_new_value);
+    }
+}
+
+//-------------------------------------------------------------------------
+// LED handling
+//-------------------------------------------------------------------------
+
+DigitalOut led1(P0_21);
+DigitalOut led2(P0_22);
+DigitalOut led3(P0_23);
+DigitalOut led4(P0_24);
+
+uint8_t led_value = 0;
+
+void onLedDataWritten(const uint8_t* value, uint8_t length) 
+{
+    // we only care about a single byte
+    led_value = value[0];
+
+    // depending on the value coming through; set/unset LED's
+    if ((led_value & 0x01) != 0) led1.write(0); else led1.write(1);
+    if ((led_value & 0x02) != 0) led2.write(0); else led2.write(1);
+    if ((led_value & 0x04) != 0) led3.write(0); else led3.write(1);
+    if ((led_value & 0x08) != 0) led4.write(0); else led4.write(1);
+
+    INFO_NL("     led state: [0x%02x]", led_value);
+}
+
+//-------------------------------------------------------------------------
+
+void onConnection(const Gap::ConnectionCallbackParams_t *params)
+{
+  INFO_NL(">> connected");
+
+  // set the initial values of the characteristics (for every session)
+  led_value = 0;
+  onLedDataWritten(&led_value, 1); // force LED's to be in off state
+}
+
+void onDataWritten(const GattWriteCallbackParams *context) 
+{
+   // was the characteristic being written to nRF51_GATT_CHAR_LED? 
+  if (context -> handle == 
+       gatt_characteristics[CHARACTERISTIC_LED] -> getValueHandle())
+   {
+     onLedDataWritten(context -> data, context -> len);
+   } 
+}
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
+{
+    INFO_NL(">> disconnected");
+    ble.gap().startAdvertising(); // restart advertising
+    INFO_NL(">> device advertising");
+}
+
+
+int main() 
+{
+#ifdef CONSOLE_LOG
+    // wait a second before trying to write something to console 
+    wait(1);
+#endif
+    INFO_NL(">> nRF51-DK start");
+
+    // create our button characteristic (read, notify)
+    gatt_characteristics[CHARACTERISTIC_BUTTON] = 
+      new GattCharacteristic(
+            nRF51_GATT_CHAR_BUTTON, 
+            &gatt_char_value[CHARACTERISTIC_BUTTON], 1, 1,
+            GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | 
+            GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
+
+    // create our LED characteristic (read, write)
+    gatt_characteristics[CHARACTERISTIC_LED] = 
+      new GattCharacteristic(
+            nRF51_GATT_CHAR_LED, 
+            &gatt_char_value[CHARACTERISTIC_LED], 1, 1,
+            GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | 
+            GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | 
+            GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE);
+
+    // create our service, with both characteristics
+    gatt_service = 
+      new GattService(nRF51_GATT_SERVICE, 
+                      gatt_characteristics, CHARACTERISTIC_COUNT);
+
+    // initialize our ble device
+    ble.init();
+    ble.gap().setDeviceName((uint8_t *)DEVICE_NAME);
+    INFO_NL(">> initialized device '%s'", DEVICE_NAME);
+
+    // configure our advertising type, payload and interval
+    ble.gap().accumulateAdvertisingPayload(
+          GapAdvertisingData::BREDR_NOT_SUPPORTED | 
+          GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.gap().accumulateAdvertisingPayload(
+          GapAdvertisingData::COMPLETE_LOCAL_NAME, 
+          (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.gap().setAdvertisingInterval(160); // 100ms
+    INFO_NL(">> configured advertising type, payload and interval");
+
+    // configure our callbacks
+    ble.gap().onDisconnection(disconnectionCallback);
+    ble.gap().onConnection(onConnection);
+    ble.onDataWritten(onDataWritten);
+    INFO_NL(">> registered for callbacks");
+
+    // add our gatt service with two characteristics
+    ble.addService(*gatt_service);
+    INFO_NL(">> added GATT service with two characteristics");
+
+    // show some debugging information about service/characteristics
+    INFO_UUID(" ", nRF51_GATT_SERVICE);
+    INFO_UUID("  :", nRF51_GATT_CHAR_BUTTON);
+    INFO_UUID("  :", nRF51_GATT_CHAR_LED);
+
+    // start advertising
+    ble.gap().startAdvertising();
+    INFO_NL(">> device advertising");
+
+    // start monitoring the buttons and posting new values
+    Ticker ticker;
+    ticker.attach(monitorButtons, 0.1);  // every 10th of a second
+    INFO_NL(">> monitoring button state");
+
+    // let the device do its thing
+    INFO_NL(">> waiting for events ");
+    for (;;)
+    {
+      ble.waitForEvent();
+    }
+}
+
+//-------------------------------------------------------------------------
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