sd_ble_gatts_sys_attr_set and Flash

[Marcel Mulder]

Hi,

When I call sd_ble_gatts_sys_attr_set and p_sys_attr_data points to data in flash I get a NRF_ERROR_INVALID_DATA. When I point to the same data in RAM I don't get an error. Why is this? The first line in the function description says:

Update persistent system attribute information.

Persistent data which cannot be in Flash? I am puzzled.

Greats, Marcel

[Susheel Nuguru]

That is because the softdevice does not want to check for any flash specific write operations. That is it just writes to the memory, it does not check if the memory is in flash, clean to write, if not write corrupt or erase page etc

[Marcel Mulder]

sd_ble_gatts_sys_attr_set only reads (at least it should) the pointer where the persistent data was stored before using the sd_ble_gatts_sys_attr_get function. There is no writing involved with sd_ble_gatts_sys_attr_set.

p_sys_attr_data Pointer to a saved copy of system attributes supplied to the stack, or NULL. Saved but in RAM? Read sd_ble_gatts_sys_attr_set

[Susheel Nuguru]

Thats right, sorry for jumping in too quick, my tired eyes saw that as a get function, not a set. i will have call it a day today and rest my eyes!!!

Before that, to answer you. This is a not intentional, sd_ble_gatts_sys_attr_set should allow flash addresses. I will create a JIRA ticket, not sure when it will be fixed.

[Marcel Mulder]

Thanks and sleep well :-D

[Susheel Nuguru]

The workaround for now can be to copy the system attributes from flash to RAM before passing them as parameter to sys_attr_set(). Can we rest this case Marcel?

[Marcel Mulder]

Yes. I place it onto the stack when I call sd_ble_gatts_sys_attr_set. That works. I will close it.