nrf51822 创建DFU的镜像文件方法

Myth丶恋晨 2022-07-27 14:49 172阅读 0赞

**Creating an image file**

**The format of the firmware image that you use to update the device firmware depends on the tool that you use to perform the DFU. The DFU bootloader expects the image in binary format; however, some tools automatically convert the image from HEX format to binary format.**

# Creating a zip with image and init packet #

If you use Master Control Panel or other tools by Nordic Semiconductor to update the device firmware, you must provide a zip that contains the image file and a corresponding init packet. To create this zip file, use the  `nrfutil.exe`  tool that is installed with the Master Control Panel (named  `nrf.exe`  in Master Control Panel versions <3.10.0). By default, the tool is located in the  `C:\Program Files (x86)\Nordic Semiconductor\Master Control Panel\<version>\nrf\` folder on Windows. For Linux and OS X users, nrfutils is available as a standalone python package with command line utility on the Nordic Semiconductor GitHub profile. Run  `nrfutil.exe dfu genpkg --help`  to display usage instructions.

You can add the following firmware images in binary format to the zip file:

*  `--application` *image.bin:* a binary image of an application
 *  `--bootloader` *image.bin:* a binary image of a bootloader
 *  `--softdevice` *image.bin:* a binary image of a SoftDevice

You can also combine several images in one zip file.

In addition to the images, you must specify the information that will be added to the init packet:

*  `--application-version` *version:* the version of the application image, for example, `0xff`
 *  `--dev-revision` *version:* the revision of the device that should accept the image, for example, `1`
 *  `--dev-type` *type:* the type of the device that should accept the image, for example, `1`
 *  `--sd-req` *sd\_list:* a comma-separated list of FWID values of SoftDevices that are valid to be used with the new image, for example, `0x4f,0x5a`
 *  ``

# Creating a binary image #

When you compile an application in Keil, two images are created:

*  A HEX file
 *  An AXF (ELF) file

In most cases, you can use the image in HEX format to perform the DFU. If you need a binary image, use the command line tool `fromelf.exe` to convert the AXF file into a binary image. The tool is located in the `<KeilFolder>\ARM\ARMCC\bin`folder.

Call `fromelf.exe` as follows to convert an AXF image into a binary file:

<Keil-folder>\ARM\ARMCC\bin\fromelf.exe --bin --output <outfile.bin> <infile.axf>