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dfu_init.h

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00001 /* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
00002  *
00003  * The information contained herein is property of Nordic Semiconductor ASA.
00004  * Terms and conditions of usage are described in detail in NORDIC
00005  * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
00006  *
00007  * Licensees are granted free, non-transferable use of the information. NO
00008  * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
00009  * the file.
00010  *
00011  */
00012 
00013 /**@file
00014  *
00015  * @defgroup nrf_dfu_init Init packet handling in DFU.
00016  * @{
00017  *
00018  * @brief Device Firmware Update module type and function declaration for init packet handling.
00019  *
00020  * @details This header contains basic functionality for performing safety checks on software 
00021  *          updates for nRF51 based devices. It provides a skeleton for pre-checking an init packet
00022  *          to ensure the following image is compatible with this device. A safety check should 
00023  *          always be performed to prevent accidental flashing of unsupported applications or a
00024  *          wrong combination of application and SoftDevice.
00025  *          The device information contains information such as:
00026  *          - Device type (2 bytes), for example Heart Rate. The device type is a number defined by
00027  *            the customer. It can be located in UICR or FICR.
00028  *          - Device revision (2 bytes), for example major revision 1, minor revision 0. The device
00029  *            revision is a number defined by the customer. It can be located in UICR or FICR.
00030  *          - List of SoftDevices supported by this application, for example 
00031  *              0x0049 = S110v6_0_0 
00032  *              0xFFFE = S110 development (any SoftDevice accepted),
00033  *          - CRC or hash of firmware image
00034  *
00035  * @note This module does not support security features such as image signing, but the corresponding
00036  *       implementation allows for such extensions.
00037  *       If the init packet is signed by a trusted source, it must be decrypted before it can be 
00038  *       processed.
00039  */
00040 
00041 #ifndef DFU_INIT_H__
00042 #define DFU_INIT_H__
00043 
00044 #include <stdint.h>
00045 #include "nrf51.h"
00046 
00047 /**@brief Structure contained in an init packet. Contains information on device type, revision, and 
00048  *        supported SoftDevices.
00049  */
00050 typedef struct
00051 {
00052     uint16_t device_type;                                                                   /**< Device type (2 bytes), for example Heart Rate. This number must be defined by the customer before production. It can be located in UICR or FICR. */
00053     uint16_t device_rev;                                                                    /**< Device revision (2 bytes), for example major revision 1, minor revision 0. This number must be defined by the customer before production. It can be located in UICR or FICR. */
00054     uint32_t app_version;                                                                   /**< Application version for the image software. This field allows for additional checking, for example ensuring that a downgrade is not allowed. */
00055     uint16_t softdevice_len;                                                                /**< Number of different SoftDevice revisions compatible with this application. The list of SoftDevice firmware IDs is defined in @ref softdevice. */
00056     uint16_t softdevice[1];                                                                 /**< Variable length array of SoftDevices compatible with this application. The length of the array is specified in the length field. SoftDevice firmware id 0xFFFE indicates any SoftDevice. */
00057 } dfu_init_packet_t;
00058 
00059 /**@brief Structure holding basic device information settings.
00060  */
00061 typedef struct
00062 {
00063     uint16_t device_type;                                                                   /**< Device type (2 bytes), for example Heart Rate. This number must be defined by the customer before production. It can be located in UICR or FICR. */
00064     uint16_t device_rev;                                                                    /**< Device revision (2 bytes), for example major revision 1, minor revision 0. This number must be defined by the customer before production. It can be located in UICR or FICR. */
00065 } dfu_device_info_t;
00066 
00067 /** The device info offset can be modified to place the device info settings at a different location.
00068   * If the customer reserved UICR location is used for other application specific data, the offset
00069   * must be updated to avoid collision with that data.
00070   */
00071 /** [DFU UICR DEV offset] */
00072 #define UICR_CUSTOMER_DEVICE_INFO_OFFSET    0x0                                             /**< Device info offset inside the customer UICR reserved area. Customers may change this value to place the device information in a user-preferred location. */
00073 /** [DFU UICR DEV offset] */
00074 
00075 #define UICR_CUSTOMER_RESERVED_OFFSET       0x80                                            /**< Customer reserved area in the UICR. The area from UICR + 0x80 is reserved for customer usage. */
00076 #define DFU_DEVICE_INFO_BASE                (NRF_UICR_BASE + \
00077                                              UICR_CUSTOMER_RESERVED_OFFSET + \
00078                                              UICR_CUSTOMER_DEVICE_INFO_OFFSET)              /**< The device information base address inside of UICR. */
00079 #define DFU_DEVICE_INFO                     ((dfu_device_info_t *)DFU_DEVICE_INFO_BASE)     /**< The memory mapped structure for device information data. */
00080 
00081 #define DFU_DEVICE_TYPE_EMPTY               ((uint16_t)0xFFFF)                              /**< Mask indicating no device type is present in UICR. 0xFFFF is default flash pattern when not written with data. */
00082 #define DFU_DEVICE_REVISION_EMPTY           ((uint16_t)0xFFFF)                              /**< Mask indicating no device revision is present in UICR. 0xFFFF is default flash pattern when not written with data. */
00083 #define DFU_SOFTDEVICE_ANY                  ((uint16_t)0xFFFE)                              /**< Mask indicating that any SoftDevice is allowed for updating this application. Allows for easy development. Not to be used in production images. */
00084 
00085 
00086 /**@brief DFU prevalidate call for pre-checking the received init packet.
00087  *
00088  * @details  Pre-validation will safety check the firmware image to be transfered in second stage.
00089  *           The function currently checks the device type, device revision, application firmware 
00090  *           version, and supported SoftDevices. More checks should be added according to 
00091  *           customer-specific requirements.
00092  * 
00093  * @param[in] p_init_data    Pointer to the init packet. If the init packet is encrypted or signed,
00094  *                           it must first be decrypted before being checked.
00095  * @param[in] init_data_len  Length of the init data.
00096  *
00097  * @retval NRF_SUCCESS              If the pre-validation succeeded, that means the image is 
00098  *                                  supported by the device and it is considered to come from a 
00099  *                                  trusted source (signing).
00100  * @retval NRF_ERROR_INVALID_DATA   If the pre-validation failed, that means the image is not 
00101  *                                  supported by the device or comes from an un-trusted source 
00102  *                                  (signing).
00103  * @retval NRF_ERROR_INVALID_LENGTH If the size of the init packet is not within the limits of 
00104  *                                  the init packet handler.
00105  */
00106 uint32_t dfu_init_prevalidate(uint8_t * p_init_data, uint32_t init_data_len);
00107 
00108 /**@brief DFU postvalidate call for post-checking the received image using the init packet.
00109  *
00110  * @details  Post-validation can verify the integrity check the firmware image received before 
00111  *           activating the image.
00112  *           Checks performed can be: 
00113  *           - A simple CRC as shown in the corresponding implementation of this API in the file
00114  *             dfu_init_template.c
00115  *           - A hash for better verification of the image.
00116  *           - A signature to ensure the image originates from a trusted source.
00117  *           Checks are intended to be expanded for customer-specific requirements.
00118  * 
00119  * @param[in] p_image    Pointer to the received image. The init data provided in the call 
00120  *                       \ref dfu_init_prevalidate will be used for validating the image.
00121  * @param[in] image_len  Length of the image data.
00122  *
00123  * @retval NRF_SUCCESS             If the post-validation succeeded, that meant the integrity of the
00124  *                                 image has been verified and the image originates from a trusted 
00125  *                                 source (signing).
00126  * @retval NRF_ERROR_INVALID_DATA  If the post-validation failed, that meant the post check of the 
00127  *                                 image failed such as the CRC is not matching the image transfered
00128  *                                 or the verification of the image fails (signing).
00129  */
00130 uint32_t dfu_init_postvalidate(uint8_t * p_image, uint32_t image_len);
00131 
00132 #endif // DFU_INIT_H__
00133 
00134 /**@} */