DFU utilities

Function for checking if the main application is valid.

This function checks if there is a valid application located at Bank 0.

Return values

true	If a valid application has been detected.
false	If there is no valid application.

Function for continuing an ongoing DFU operation.

This function initiates or continues the DFU copy-back routines. These routines are fail-safe operations to activate either a new SoftDevice, Bootloader, combination of SoftDevice and Bootloader, or a new application.

This function relies on accessing MBR commands through supervisor calls. It does not rely on the SoftDevice for flash operations.

Note

When updating the bootloader or both bootloader and SoftDevice in combination, this function does not return, but rather initiate a reboot to activate the new bootloader.

Parameters

[in,out]

p_enter_dfu_mode

True if the continuation failed or the update requires DFU mode.

Return values

NRF_SUCCESS

If the DFU operation was continued successfully. Any other error code indicates that the DFU operation could not be continued.

Function for finding a cache write location for the DFU process.

This function checks the size requirements and selects a location for placing the cache of the DFU images. The function tries to find enough space in Bank 1. If there is not enough space, the present application is erased.

Parameters

[in]	size_req	Requirements for the size of the new image.
[in]	dual_bank_only	True to enforce dual-bank updates. In this case, if there is not enough space for caching the DFU image, the existing application is retained and the function returns an error.
[out]	p_address	Updated to the cache address if a cache location is found.

Return values

NRF_SUCCESS	If a cache location was found for the DFU process.
NRF_ERROR_NO_MEM	If there is no space available on the device to continue the DFU process.