Diff: keyboard_stream.cpp

Revision:

0:cb1939018833

Child:

1:9e174f8fd9e9

diff -r 000000000000 -r cb1939018833 keyboard_stream.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/keyboard_stream.cpp	Mon Nov 02 18:25:58 2015 +0000
@@ -0,0 +1,130 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 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 "KeyboardService.h"
+
+#include "examples_common.h"
+
+/**
+ * This program implements a complete HID-over-Gatt Profile:
+ *  - HID is provided by KeyboardService
+ *  - Battery Service
+ *  - Device Information Service
+ *
+ * Complete strings can be sent over BLE using printf. Please note, however, than a 12char string
+ * will take about 500ms to transmit, principally because of the limited notification rate in BLE.
+ * KeyboardService uses a circular buffer to store the strings to send, and calls to putc will fail
+ * once this buffer is full. This will result in partial strings being sent to the client.
+ */
+
+DigitalOut waiting_led(LED1);
+DigitalOut connected_led(LED2);
+
+InterruptIn button1(BUTTON_A);
+InterruptIn button2(BUTTON_B);
+
+BLE ble;
+KeyboardService *kbdServicePtr;
+
+static const char DEVICE_NAME[] = "microbitkb";
+static const char SHORT_DEVICE_NAME[] = "kbd1";
+
+static void onDisconnect(const Gap::DisconnectionCallbackParams_t *params)
+{
+    HID_DEBUG("disconnected\r\n");
+    connected_led = 0;
+
+    ble.gap().startAdvertising(); // restart advertising
+}
+
+static void onConnect(const Gap::ConnectionCallbackParams_t *params)
+{
+    HID_DEBUG("connected\r\n");
+    waiting_led = false;
+}
+
+static void waiting() {
+    if (!kbdServicePtr->isConnected())
+        waiting_led = !waiting_led;
+    else
+        connected_led = !connected_led;
+}
+
+void send_string(const char * c) {
+    if (!kbdServicePtr)
+        return;
+
+    if (!kbdServicePtr->isConnected()) {
+        HID_DEBUG("we haven't connected yet...");
+    } else {
+        int len = strlen(c);
+        kbdServicePtr->printf(c);
+        HID_DEBUG("sending %d chars\r\n", len);
+    }
+}
+
+void send_stuff() {
+    send_string("n");
+}
+
+void send_more_stuff() {
+    send_string("p");
+}
+
+int main()
+{
+    Ticker heartbeat;
+
+    button1.rise(send_stuff);
+    button2.rise(send_more_stuff);
+
+    HID_DEBUG("initialising ticker\r\n");
+
+    heartbeat.attach(waiting, 1);
+
+    HID_DEBUG("initialising ble\r\n");
+    ble.init();
+
+    ble.gap().onDisconnection(onDisconnect);
+    ble.gap().onConnection(onConnect);
+
+    initializeSecurity(ble);
+
+    HID_DEBUG("adding hid service\r\n");
+    KeyboardService kbdService(ble);
+    kbdServicePtr = &kbdService;
+
+    HID_DEBUG("adding device info and battery service\r\n");
+    initializeHOGP(ble);
+
+    HID_DEBUG("setting up gap\r\n");
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::KEYBOARD);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME,
+                                           (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME,
+                                           (uint8_t *)SHORT_DEVICE_NAME, sizeof(SHORT_DEVICE_NAME));
+
+    HID_DEBUG("advertising\r\n");
+    ble.gap().startAdvertising();
+
+    while (true) {
+        ble.waitForEvent();
+    }
+}
+