RE: nRF52833 uart bootloader

riha2020 — Sun, 05 Apr 2020 12:09:39 GMT

Hi did you get this working for NRF52833? any changes in addtion to those listed by Bjorn?

Would appreciate anything that helped with this, thanks

RE: nRF52833 uart bootloader

ShowMaker — Wed, 08 Jan 2020 06:40:08 GMT

Thank you for the helpful response. Just to clarify for non soft device applications ( uart transport bootloader ) with MBR isn't RAM start address supposed to be 0x20000008 or is this the placement address for nRF52833?

RE: nRF52833 uart bootloader

bjorn-spockeli — Tue, 07 Jan 2020 14:55:13 GMT

Hi ShowMaker,

Apologies for the late reply. We're working through the backlog from the Christmas holidays.

I would recommend porting the pca10040_uart example instead of the pca10056_uart, since the nRF52833 like nRF52832 does not have the Cryptocell and you do not have to deal with the crypto backend settings ets.

So to port the pca10040_uart example to run on the pca10100 you will have to do the following changes in the Preprocessor Definitions

replace NRF52832_XXAA with NRF52833_XXAA
replace BOARD_PCA10040 with BOARD_PCA10100

Alter the Code > Linker > Section Placement Macros to the following

FLASH_START=0x78000

FLASH_SIZE=0x6000

RAM_START=0x2000260c

RAM_SIZE=0x1d9f4

As you have pointed out you also have to replace ses_startup_nrf52.s with ses_startup_nrf52833.s.

The MBR is loaded as an additional load file under Debug > Loader > Additional Load File[0] in the Project settings. If you port the pca10040_uart examle then you do not have to do any changes there. I also beleive that the sdk_config.h file can be left unchanged.

Best regards

Bjørn