Diff: features/FEATURE_BLE/ble/services/DFUService.h

Revision:

0:6c56fb4bc5f0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/FEATURE_BLE/ble/services/DFUService.h	Fri Nov 04 20:27:58 2016 +0000
@@ -0,0 +1,146 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 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.
+ */
+
+#ifdef TARGET_NRF51822 /* DFU only supported on nrf51 platforms */
+
+#ifndef __BLE_DFU_SERVICE_H__
+#define __BLE_DFU_SERVICE_H__
+
+#include "ble/BLE.h"
+#include "ble/UUID.h"
+
+extern "C" {
+#include "dfu_app_handler.h"
+}
+
+extern const uint8_t  DFUServiceBaseUUID[];
+extern const uint16_t DFUServiceShortUUID;
+extern const uint16_t DFUServiceControlCharacteristicShortUUID;
+
+extern const uint8_t  DFUServiceUUID[];
+extern const uint8_t  DFUServiceControlCharacteristicUUID[];
+extern const uint8_t  DFUServicePacketCharacteristicUUID[];
+
+/**
+* @class DFUService
+* @brief Device Firmware Update Service.
+*/
+class DFUService {
+public:
+    /**
+     * @brief Signature for the handover callback. The application may provide this
+     * callback when setting up the DFU service. The callback is then
+     * invoked before handing control over to the bootloader.
+     */
+    typedef void (*ResetPrepare_t)(void);
+
+public:
+    /**
+    * @brief Adds Device Firmware Update Service to an existing BLE object.
+    *
+    * @param[ref] _ble
+    *               BLE object for the underlying controller.
+    * @param[in] _handoverCallback
+    *                Application-specific handover callback.
+    */
+    DFUService(BLE &_ble, ResetPrepare_t _handoverCallback = NULL) :
+        ble(_ble),
+        controlPoint(DFUServiceControlCharacteristicUUID, controlBytes, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
+        packet(DFUServicePacketCharacteristicUUID, packetBytes, SIZEOF_PACKET_BYTES, SIZEOF_PACKET_BYTES,
+               GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE),
+        controlBytes(),
+        packetBytes() {
+        static bool serviceAdded = false; /* We only add the DFU service once. */
+        if (serviceAdded) {
+            return;
+        }
+
+        /* Set an initial value for control bytes, so that the application's DFU service can
+         * be distinguished from the real DFU service provided by the bootloader. */
+        controlBytes[0] = 0xFF;
+        controlBytes[1] = 0xFF;
+
+        GattCharacteristic *dfuChars[] = {&controlPoint, &packet};
+        GattService         dfuService(DFUServiceUUID, dfuChars, sizeof(dfuChars) / sizeof(GattCharacteristic *));
+
+        ble.addService(dfuService);
+        handoverCallback = _handoverCallback;
+        serviceAdded     = true;
+
+        ble.onDataWritten(this, &DFUService::onDataWritten);
+    }
+
+    /**
+    * @brief Get the handle for the value attribute of the control characteristic.
+    */
+    uint16_t getControlHandle(void) const {
+        return controlPoint.getValueHandle();
+    }
+
+    /**
+     * @brief This callback allows the DFU service to receive the initial trigger to
+     * hand control over to the bootloader. First, the application is given a
+     * chance to clean up.
+     *
+     * @param[in] params
+     *     Information about the characterisitc being updated.
+     */
+    virtual void onDataWritten(const GattWriteCallbackParams *params) {
+        if (params->handle == controlPoint.getValueHandle()) {
+            /* At present, writing anything will do the trick - this needs to be improved. */
+            if (handoverCallback) {
+                handoverCallback();
+            }
+
+            // 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);
+        }
+    }
+
+protected:
+    static const unsigned SIZEOF_CONTROL_BYTES = 2;
+    static const unsigned SIZEOF_PACKET_BYTES  = 20;
+
+protected:
+    BLE          &ble;
+
+    /**< Writing to the control characteristic triggers the handover to DFU 
+      *  bootloader. At present, writing anything will do the trick - this needs
+      *  to be improved. */
+    WriteOnlyArrayGattCharacteristic<uint8_t, SIZEOF_CONTROL_BYTES> controlPoint;
+
+    /**< The packet characteristic in this service doesn't do anything meaningful;
+      *  it is only a placeholder to mimic the corresponding characteristic in the
+      *  actual DFU service implemented by the bootloader. Without this, some
+      *  FOTA clients might get confused, because service definitions change after
+      *  handing control over to the bootloader. */
+    GattCharacteristic  packet;
+
+    uint8_t             controlBytes[SIZEOF_CONTROL_BYTES];
+    uint8_t             packetBytes[SIZEOF_PACKET_BYTES];
+
+    static ResetPrepare_t handoverCallback;  /**< Application-specific handover callback. */
+};
+
+#endif /* #ifndef __BLE_DFU_SERVICE_H__*/
+#endif /* #ifdef TARGET_NRF51822 */