ANCS init issue with SDK11 s132 nRF52

[Cyril Praz]

Hello everybody,

I have a problem when I try initialize the ANCS service. The method ble_ancs_c_init(); from ble_ancs_c.h return the error NRF_ERROR_NO_MEM.

My configuration of the ble stack is :
sdEnableParams.gatts_enable_params.attr_tab_size = 0x1000;
sdEnableParams.gatts_enable_params.service_changed = 0;
sdEnableParams.gap_enable_params.periph_conn_count = 1;
sdEnableParams.gap_enable_params.central_conn_count = 0;

My configuration of the RAM area is:
start adress = 0x20002A68
RAM size = 0xD598

When I launch the application I have this log:
0> RAM START ADDR 0x20002A68 should be adjusted to 0x20001FE8
0> RAM SIZE should be adjusted to 0xE018
0> sd_ble_enable: RAM START at 0x20002A68

I modified the RAM area to match this:
start adress = 0x20001FE8
RAM size = 0xE018

I launch again the application I have now another error coming from softdevice_enable(). The returned error is also NRF_ERROR_NO_MEM

Strangely the log I have from the application is this:
0> sd_ble_enable: RAM START at 0x20001FE8
0> sd_ble_enable: app_ram_base should be adjusted to 0x20002A68
0> ram size should be adjusted to 0xD598

After that I tried to find where I messed up by comparing my project with a working example from Nordic and I only found that Nordic setted this configuration for the RAM area:
start adress = 0x200021B8
RAM size = 0xDE48

The same error is coming from softdevice_enable() after a launch.

It would be really great if you can help to solve this problem. I have already to increase the ble stack size with sdEnableParams.gatts_enable_params.attr_tab_size but nothing work.

[Cyril Praz]

I have solved the problem by reducing the size of the heap and call stack defined inside arm_startup_nrf52.s

and by increasing the number of vendor uuid:

ble_enable_params_t sdEnableParams;  

sdEnableParams.common_enable_params.vs_uuid_count       = 10;

The .map file generated during the compilation was very useful to solved the problem.

[run_ar]

There is a description about softdevice ram usage in the softdevice migration document called SoftDevice RAM usage that you can look at for the details. Note that if you are adding the ANCS service to an existing project you might have to update the SOFTDEVICE_GATTS_ATTR_TAB_SIZE.