BLE_DB_DISCOVERY_MAX_CHAR_PER_SRV Issue

[danbujak]

I'm trying to discover a vendor specific service that has 7 characteristics. However, when I increase BLE_DB_DISCOVERY_MAX_CHAR_PER_SRV to 7 , ble_stack_init() hard faults on SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);

I'm using SDK 7.2

ble_app_multilink_central.zip

[Petter Myhre]

I don't see how the Discovery Module will cause this. I just tested with #define BLE_DB_DISCOVERY_MAX_CHAR_PER_SRV 7 in ble_app_multilink_central from SDK 7.2 with SoftDevice S120 1.0.1 on a nRF51 DK. I don't get any error.

[danbujak]

I'm using the same application. The only changes I made to it are changing the define to 7, and increasing the IRAM to 0x2800 because I get memory errors when I increase the array. Then when the softdevice handler initializes I get a hardfault.

I should note it works fine with SDK 8.1

[Petter Myhre]

Are you using a nRF51 DK? If not, what are you using? You changed IRAM size from 0x1800 to 0x2800? I don't get any memory errors with 0x1800. There is something strange here... Could you upload your complete project so I can test it here?

[danbujak]

I'm using the nRF51 DK. I've attached a SS of the error I get when I leave IRAM at 0x1800, and the project. The only other thing I've added is BSP and RTT

[Petter Myhre]

I investigated some more, and the S120 1.x.x. has hardcoded RAM memory limits. So the SoftDevice+application can't use more than 16 kB (0x2800+0x1800) of RAM. So your options are to use less RAM or upgrade to S120 2.x.x or S130 1.x.x.