Bootloader debugging using SWO

[danny habot]

Hi, 

We are currently developing an app which require DFU. 

As part of the bootloader development we would like to use the SWO in order to do a printf debug. 

In the app we followed the guide in the link below and were successful however in the bootloader the best we got was to print single char using ITM_SendChar(). 

please assist, as without debug the programming is very difficult.  

guide: http://www.keil.com/appnotes/files/apnt_308.pdf

best regards, 

Danny

[Edvin]

Hello,

Is there any reason why you don't want to use the NRF_LOG module during debugging/development? I am sure it is possible to use 

So you got the SWO to send one char at the time, right? I haven't tested this, but are you able to use the printf module to use the ITM_sendchar instead of the UART or RTT log?

 

Best regards,

Edvin

[danny habot]

Hi Edvin, 

i would love to use the NRF_LOG module but i couldn't get it to work. in the app i worked with the guide mentioned above and got to a working state however the same configuration doesn't work with the bootloader. 

Best regards, 

Danny

[Edvin]

Hello Danny,

I haven't tested it myself, but if you try e.g. the SDK15\examples\dfu\secure_bootloader\pca10040_debug\arm5_no_packs

I believe this should print the NRF_LOG messages on RTT without any modifications.

 

Let me know if that doesn't work, and I will look into it tomorrow.

 

Best regards,

Edvin