problems with DFU bootloader

[nejcokle]

Hello.

I want to flash DFU bootloader with keil on chip nRF51822-CEAA (256kB flash, 16kB RAM). I'm using s130

The areas i write to are:

IROM start: 0x3C000
IROM size: 0x3C00
IRAM1 start:0x20002C00
IRAM1 size:0x2048
IRAM2 start:0x20004C48
IRAM2 size:0x80
(NoInit checked for RAM2)

I use IROM size 0x2048 because, if i use 0x1380 (like i found in some answered questions about DFU on this forum) i get an error which says that "... 0x800 bytes could not fit into .ANY selector(s)".

When i use my settings i can compile just fine, but then i get error "error: The are to write is not erased".

Note that i followed all the steps in dfu_dual_bank example. I erased chip, flashed SD130, and then it stopped at flashing bootloader.

Best regards, Nejc

[bjorn-spockeli]

The 16kB RAM is memory mapped from 0x20000000 to 0x20004000 and setting IRAM1 size to 0x2048 and IRAM2 start at 0x20004C48 will therefore not work.

The correct ROM/RAM settings for the bootloader example a nRF51 chip with 16kB RAM is:

IROM start: 0x3C000 size: 0x3C00
IRAM1 start:0x20002C00 size:0x1380
IRAM2 start:0x20003F80 size:0x80(NoInit checked)

This is the only setting that has to be changed in the SDK bootloader examples in order for it to run on a 16kB RAM variant of the nRF51.

Have you altered the example? Are you using Cross_Module Optimization, MicroLib and optimization set to level 3 (-O3)?

-Bjørn

[nejcokle]

I searched the community and found an example you posted to someone. I tried using that example and it compiled successfully (without having to set stack size to 255, and with settings for 16kB RAM). I found the answer in this question. Now i have another problem.. my j-link doesn't detect my board.. but i'll fix that. I'll let you know if DFU works once i'll be able to flash it.

Thanks for all your help.