nRF51 SDK - S110 SoftDevice
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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.
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 nrf.exe
tool that is installed with the Master Control Panel. By default, the tool is located in the C:\Program Files (x86)\Nordic Semiconductor\Master Control Panel\<version>\nrf\
folder. Run nrf.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 SoftDeviceYou 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
When you compile an application in Keil, two images are created:
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>