SDK14.2 DFU power cycle issue

[Sensorion]

Situation: Trying to upgrade previous versions of the SD and BL (V3.0.0) to (V5.0.0) Problem: device power cycles after a new application is flashed to the device into the V5.0.0 SD and BL.

Steps:

1. Take target device, including dev board, and program SD3.0.0 and V3.0 buttonless bootloader
2. DFU an App appropriate for SDV3.0.0 and run it.
3. DFU the new SD and BL (V5.0.0) package to the device
4. DFU an App appropriate for SDV5.0.0 and run it

Result of performing all 4 steps is that the device keeps power cycling. If you skip step 2, the procedure works and the device functions as desired.

I am guessing that there is some internal register that is written to during the DFU process in step 2, and that this register is not being updated to accommodate the position changes due to the larger SD.

Is there a work around?

[Hung Bui]

Hi Sensorion,

I'm sorry that I didn't think of the issue. It's a known issue that when the size of fds changed, there is a chance that the swap page is not recognized and throw FDS_ERR_NO_PAGES when you call fds_init().

Currently there isn't a function to format fds pages for the first use. You may need to erase the pages manually using fstorage. We also think of adding an option in the DFU bootloader to erase customer data when doing DFU but it's not implemented.

For now we suggest to keep the number of pages the same between different firmware version, or only increase not decrease number of pages, should also work.