Diff: source/bluetooth/MicroBitDFUService.cpp

Revision:

1:8aa5cdb4ab67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/bluetooth/MicroBitDFUService.cpp	Thu Apr 07 01:33:22 2016 +0100
@@ -0,0 +1,137 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2016 British Broadcasting Corporation.
+This software is provided by Lancaster University by arrangement with the BBC.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+/**
+ * Class definition for a MicroBit Device Firmware Update loader.
+ *
+ * This is actually just a frontend to a memory resident nordic DFU loader.
+ *
+ * We rely on the BLE standard pairing processes to provide encryption and authentication.
+ * We assume any device that is paied with the micro:bit is authorized to reprogram the device.
+ *
+ */
+#include "MicroBitConfig.h"
+#include "MicroBitDFUService.h"
+#include "ble/UUID.h"
+#include "MicroBitConfig.h"
+
+#if !defined(__arm)
+#pragma GCC diagnostic ignored "-Wunused-function"
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+/*
+ * The underlying Nordic libraries that support BLE do not compile cleanly with the stringent GCC settings we employ
+ * If we're compiling under GCC, then we suppress any warnings generated from this code (but not the rest of the DAL)
+ * The ARM cc compiler is more tolerant. We don't test __GNUC__ here to detect GCC as ARMCC also typically sets this
+ * as a compatability option, but does not support the options used...
+ */
+extern "C" {
+#include "dfu_app_handler.h"
+}
+
+/*
+ * Return to our predefined compiler settings.
+ */
+#if !defined(__arm)
+#pragma GCC diagnostic pop
+#endif
+
+
+/**
+  * Constructor.
+  * Initialise the Device Firmware Update service.
+  * @param _ble The instance of a BLE device that we're running on.
+  */
+MicroBitDFUService::MicroBitDFUService(BLEDevice &_ble) :
+    ble(_ble)
+{
+    // Opcodes can be issued here to control the MicroBitDFU Service, as defined above.
+    GattCharacteristic  microBitDFUServiceControlCharacteristic(MicroBitDFUServiceControlCharacteristicUUID, &controlByte, 0, sizeof(uint8_t),
+            GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);
+
+    controlByte = 0x00;
+
+    // Set default security requirements
+    microBitDFUServiceControlCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL);
+
+    GattCharacteristic *characteristics[] = {&microBitDFUServiceControlCharacteristic};
+    GattService         service(MicroBitDFUServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *));
+
+    ble.addService(service);
+
+    microBitDFUServiceControlCharacteristicHandle = microBitDFUServiceControlCharacteristic.getValueHandle();
+
+    ble.gattServer().write(microBitDFUServiceControlCharacteristicHandle, &controlByte, sizeof(uint8_t));
+    ble.gattServer().onDataWritten(this, &MicroBitDFUService::onDataWritten);
+}
+
+/**
+  * Callback. Invoked when any of our attributes are written via BLE.
+  */
+void MicroBitDFUService::onDataWritten(const GattWriteCallbackParams *params)
+{
+    if (params->handle == microBitDFUServiceControlCharacteristicHandle)
+    {
+        if(params->len > 0 && params->data[0] == MICROBIT_DFU_OPCODE_START_DFU)
+        {
+            // TODO: Raise a SYSTEM event here.
+            //uBit.display.stopAnimation();
+            //uBit.display.clear();
+
+#if CONFIG_ENABLED(MICROBIT_DBG)
+            printf("  ACTIVATING BOOTLOADER.\n");
+#endif
+
+            // Perform an explicit disconnection to assist our peer to reconnect to the DFU service
+            ble.disconnect(Gap::REMOTE_DEV_TERMINATION_DUE_TO_POWER_OFF);
+
+            wait_ms(1000);
+
+            // Call bootloader_start implicitly trough a event handler call
+            // it is a work around for bootloader_start not being public in sdk 8.1
+            ble_dfu_t p_dfu;
+            ble_dfu_evt_t p_evt;
+
+            p_dfu.conn_handle = params->connHandle;
+            p_evt.ble_dfu_evt_type = BLE_DFU_START;
+
+            dfu_app_on_dfu_evt(&p_dfu, &p_evt);
+        }
+    }
+}
+
+
+/**
+  * UUID definitions for BLE Services and Characteristics.
+  */
+const uint8_t              MicroBitDFUServiceUUID[] = {
+    0xe9,0x5d,0x93,0xb0,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t              MicroBitDFUServiceControlCharacteristicUUID[] = {
+    0xe9,0x5d,0x93,0xb1,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};