NRF51822 IRAM1 Settings (multilinkCentral Projects)

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 14:40:37 GMT

ok thanks for the help

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Fri, 08 Sep 2017 14:24:01 GMT

Ok, could you create a new question describing you issue and link to this question?

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 13:12:31 GMT

i didn't see any error when start the debug session, but when i set a break point at the main(), it just didn't hit it. I have tried 0x20002BCo and 0x1440 but got a compile error. thanks..

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Fri, 08 Sep 2017 10:24:42 GMT

The IRAM settings should be identical as in the answer. i.e. start = 0x20002BC0 and size = 0x1440.

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Fri, 08 Sep 2017 09:31:58 GMT

Do you get any error when you're starting the debug session? Why are you not able to debug the project?

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 09:28:54 GMT

or perhaps you can tell me the correct iRAM setting? my setting is 0x20002BC0 and 0x2000

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 09:26:03 GMT

Hi i'm using Keil and not able to debug the project, it may not running. sorry for cause so much trouble. Thanks,

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Fri, 08 Sep 2017 09:18:17 GMT

Are you compiling the central exaple using Keil or GCC? Are you able to debug the project? If so, could you check whether you end up in the app_error_handler?

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 08:54:03 GMT

hi~ it's not working, my project original set CENTRAL_LINK_COUNT to 1, the RW-data and ZI-data didn't change the size when I changed to 2, I was able to compile and download to my board but it just doesn't run. i'm using ble_app_hrs_c example.

thanks,

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 08:02:56 GMT

thanks for the reply, let me have a test by setting CENTRAL_LINK_COUNT to 2 and let you know the result.

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Fri, 08 Sep 2017 08:00:35 GMT

The solution above appears to apply to SDK v12.0.0 only, if I use the same settings in SDK v12.3.0 then I am not able compile the project, i.e. the libraries/drivers used in the example has grown in size since the SDK v12.0.0 release. I am able to compile the SDK v13.0.0 if I set the CENTRAL_LINK_COUNT to 2.

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Fri, 08 Sep 2017 07:48:21 GMT

Hi ~ i'm using SDK 12.3.0_d7731ad

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Fri, 08 Sep 2017 07:44:33 GMT

Which SDK are you using @samsc?

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

sam — Wed, 06 Sep 2017 07:43:48 GMT

Hi~ I have the same problem, but can you tell me how to "reduce the number of peripheral connections from 8 to 4"? I change "N_WRITE_BUFFERS" from 8 to 4, but ZI-data only reduced 400, so which one is the correct setting?

Thanks,

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Thu, 05 Jan 2017 09:51:04 GMT

Happy to help :) I would appreciate if you could mark the answer as correct by clicking the check-mark in the circle to the left of the answer.

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

Oguz Emre — Thu, 05 Jan 2017 09:49:59 GMT

Thank you. :)

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Thu, 05 Jan 2017 09:45:09 GMT

Yes, the unmodified ble_app_multilink central from SDK v12.x.0 will work with all nRF51x22 devices that has 256kB Flash and 32kB RAM.

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

Oguz Emre — Thu, 05 Jan 2017 09:42:38 GMT

Thank you for your quickly answer. if we use the mutlilnk_central project in SDK without changing it, will it work with nRF51822 QFAC since it has 32 kB RAM ?

RE: NRF51822 IRAM1 Settings (multilinkCentral Projects)

bjorn-spockeli — Thu, 05 Jan 2017 09:14:36 GMT

Hi Oguz,

the nRF51822 QFAA variant only has 16kB (0x4000 bytes) of RAM while the SDK examples are compiled for the nRF51 DK, which uses the nRF51422 QFAC variant with 32kB(0x8000 bytes) of RAM.

The ble_app_multilink_central example is by default configured to have up to 8 peripheral connections, for which the SoftDevice requires 0x3C78 bytes of RAM. In order to account for the reduction you have reduce the size of the IRAM1 block, i.e. set the size to 0x4000-0x3C78 = 0x388 bytes.

However, the project will not compile with these settings, but if they did you also have to take into account that the SoftDevice and the application shares the call stack. The S130 v2.0.1 may use up to 1536bytes (0x600 bytes) which must be added to the application stack usage, see this page in the S130 SoftDevice Specification.

Thus, if the project compiled with the IRAM1 size to 0x4000-0x3C78 = 0x388 bytes, we see that we'll get a stack overflow if the SoftDevice reaches the maximum stack usage( or if the application pushes lot to the stack).

The solution is to reduce the number of peripheral connections from 8 to 4, which reduces the SoftDevice RAM requirement from 0x3C78 to 0x2BC0, i.e.

Note: The SoftDevice returns the application ram base, i.e. how much RAM it needs, when you enable the stack using sd_ble_enable().