nRF52832 uart peripheral link ERROR 4 [NRF_ERROR_NO_MEM]

[azjo]

Hi,

I am building an app which has 7 central links and 1 peripheral link with PCA10040 DK board and S132. The central links look OK. But when I use the peripheral connection to receive and send data. Receiving data looks OK. But when I use the function:

ble_nus_data_send

to send data to the central, I received an error:

<error> app: ERROR 4 [NRF_ERROR_NO_MEM]

at \nRF5_SDK_17.1.0_ddde560\nRF5_SDK_17.1.0_ddde560\examples\...\main.c:1083
PC at: 0x00031F4F
<error> app: End of error report

I changed the RAM setting from:

RAM_START=0x20004398;RAM_SIZE=0xbc68

to

RAM_START=0x20005800;RAM_SIZE=0xa800

It didn't fix the issue.

Any idea on this issue?

Thanks,

azjo

[Joakim Jakobsen]

Hi.

I'm thinking that the no memory error is coming from link context manager and not related to the RAM base address.
Can you check the return code from blcm_link_ctx_get() in ble_nus_data_send() to confirm?

Br,
Joakim

[Joakim Jakobsen]

Also; If that is the case that the error is from the blcm_link_ctx_get() function, you will have to increase the link count in your BLE_NUS_DEF() macro.

[azjo]

Hi,

I checked the error_code from blcm_link_ctx_get() , it is 4. I increased the link count in BLE_NUS_DEF() from 1 to 2. I got <error> app: SOFTDEVICE: ASSERTION FAILED. Issue is not fixed. 

Thanks

[Joakim Jakobsen]

Thanks.

Error code 4 is the NRF_ERROR_NO_MEM.
From the documentation:
If there is not enough memory to store context for the given connection handle. This can happen if the number of links is greater than p_link_ctx_storage::max_links_cnt.

Please make sure that this condition is met.

Br,
Joakim

[azjo]

Hi Joakim,

You are correct. I changed the definition 

from 

BLE_NUS_DEF(m_nus, NRF_SDH_BLE_PERIPHERAL_LINK_COUNT);

to

BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT);

It looks the issue is solved. Thanks.

BR,

azjo