DFU and custom service doesnt work together

RE: DFU and custom service doesnt work together

Hung Bui — Mon, 27 Mar 2017 12:59:32 GMT

When you increase the number of base UUID, you need to increase the ram needed for the softdevice. The UUID database enlarged, softdevice needs more RAM for it.

RE: DFU and custom service doesnt work together

Rishi — Mon, 27 Mar 2017 10:42:24 GMT

Okay. I have never encountered such behaviour, but it must be due to DFU code because vs_uuid_count is also responsible for shifting addresses. So, in order to accommodate DFU and 2 custom UUIDs, this change was necessary. Thanks for the insight.

RE: DFU and custom service doesnt work together

Prasad — Mon, 27 Mar 2017 09:52:14 GMT

When I changed vs_uuid_count=2 my application was failing. When I enabled logging and checked the logs, I found that softdevice_enable() was throwing messages and asking me to change the app_ram_base. So I shifted my application ram start address as suggested in the message given by softdevice_enable() .

RE: DFU and custom service doesnt work together

Rishi — Mon, 27 Mar 2017 08:41:24 GMT

Ok. You don't really need to change the linker file. May I know your thought process for making this change?.

RE: DFU and custom service doesnt work together

Prasad — Mon, 27 Mar 2017 07:51:30 GMT

@Rishi

I changed memory mapping in my linker file. Earlier it was

SRAM_SOFTDEVICE (RWX) : ORIGIN = 0x20000000, LENGTH = 0x1fe8
SRAM (RWX)            : ORIGIN = 0x20001fe8, LENGTH = 0x6018

And now it is

SRAM_SOFTDEVICE (RWX) : ORIGIN = 0x20000000, LENGTH = 0x1ff8
SRAM (RWX)            : ORIGIN = 0x20001ff8, LENGTH = 0x6008

RE: DFU and custom service doesnt work together

Rishi — Mon, 27 Mar 2017 03:49:53 GMT

I don't understand. You changed the app_ram_base manually or the setting changed the app_ram_base automatically.

RE: DFU and custom service doesnt work together

Prasad — Fri, 24 Mar 2017 13:33:26 GMT

Thanks!! This seam to work. But with this I also changed the app_ram_base.

RE: DFU and custom service doesnt work together

Rishi — Fri, 24 Mar 2017 11:53:38 GMT

You can try updating the vs_uuid_count=1 to vs_uuid_count=2. This value has to be updated in softdevice_handler.c present in Components/softdevice/common/ directory.