Error for connecting more than 4 centrals to multiperipheral example code

[ssc]

Hello ,

I am using Multiperipheral example code , and i want to connect more than 4 central devices. I have edited  the link total value and number of peripherals and centrals in SDK_config file. I am getting following error:

<info> app: Multiperipheral example started.<CR><LF>

<info> app: Connection with link 0x4 established.<CR><LF>
<error> app: ERROR 18 [NRF_ERROR_CONN_COUNT] at :0<CR><LF>
PC at: 0x00000000<CR><LF>
<error> app: End of error report<CR><LF>
<warning> app: System reset<CR><LF>
<info> app: Multiperipheral example started.<CR><LF>

I am using S132 softdevice and SDK V15.2.0. I think there is memory mangement issue for more than 4 devices.How to adjust the memory  and increase the number of devices can connect.?

Please help me for getting this issue solved.

Thanks and regards.

[Amanda Hsieh]

Hi, 

NRF_ERROR_CONN_COUNT means the Maximum connection count exceeded.

Can you post the setting NRF_SDH_BLE_CENTRAL_LINK_COUNT / NRF_SDH_BLE_PERIPHERAL_LINK_COUNT / NRF_SDH_BLE_TOTAL_LINK_COUNT in sdk_config.h?

-Amanda

[ssc]

Thanks for reply , Amanda.

I have two cases which i got RAM data allocation error in first case and above mentioned error in second case.

1) Case 1:Issue of RAM when the number of peripherals is made 5:

#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 5 // In sdk_config.h file

Where i have ised this condition in main code:
if (periph_link_cnt == NRF_SDH_BLE_PERIPHERAL_LINK_COUNT)
{
bsp_board_led_off(ADVERTISING_LED);
}
else
{
// Continue advertising. More connections can be established because the maximum link count has not been reached.
advertising_start();
}

following errors i got in logs while executing code:
<warning> nrf_sdh_ble: Insufficient RAM allocated for the SoftDevice.<CR><LF>
<warning> nrf_sdh_ble: Change the RAM start location from 0x20003770 to 0x20003EA0.<CR><LF>
<warning> nrf_sdh_ble: Maximum RAM size for application is 0x11558.<CR><LF>
<error> nrf_sdh_ble: sd_ble_enable() returned NRF_ERROR_NO_MEM.<CR><LF>
<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at :0<CR><LF>
PC at: 0x00000000<CR><LF>
<error> app: End of error report<CR><LF>
<warning> app: System reset<CR><LF>

2)Case 2:Issue occured when NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 1 and NRF_SDH_BLE_CENTRAL_LINK_COUNT 4:

#define LINK_TOTAL NRF_SDH_BLE_PERIPHERAL_LINK_COUNT + NRF_SDH_BLE_CENTRAL_LINK_COUNT
Where i have ised this condition in main code:
if (periph_link_cnt == LINK_TOTAL)
{
bsp_board_led_off(ADVERTISING_LED);
}
else
{
// Continue advertising. More connections can be established because the maximum link count has not been reached.
advertising_start();
}

And i got this error which is already mentioned in my first query.

Thanks and regards.
-Sarika

[Amanda Hsieh]

Hi, 

In case 1:

This line indicates that your changes to the RAM start location weren't sufficient; 
<warning> nrf_sdh_ble: Change the RAM start location from 0x20003770 to 0x20003EA0.<CR><LF>

 Did you try using the suggested 0x20003EA0?

This post might help. 

In case 2:

You should modify in sdk_config.h as

// <o> NRF_SDH_BLE_PERIPHERAL_LINK_COUNT - Maximum number of peripheral links. 
#ifndef NRF_SDH_BLE_PERIPHERAL_LINK_COUNT
#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 4
#endif

// <o> NRF_SDH_BLE_CENTRAL_LINK_COUNT - Maximum number of central links. 
#ifndef NRF_SDH_BLE_CENTRAL_LINK_COUNT
#define NRF_SDH_BLE_CENTRAL_LINK_COUNT 1
#endif

// <o> NRF_SDH_BLE_TOTAL_LINK_COUNT - Total link count. 
// <i> Maximum number of total concurrent connections using the default configuration.

#ifndef NRF_SDH_BLE_TOTAL_LINK_COUNT
#define NRF_SDH_BLE_TOTAL_LINK_COUNT 5
#endif

-Amanda

[ssc]

Thanks for the reply Amanda.

I have tried the case 2 suggestion and getting the same error as error  for the case 1  .

Can you please tell me how to change the RAM start location?

Thanks and regards.

-Sarika

[Amanda Hsieh]

Hi, 

1. Open your project in Segger Embedded Studio
2. Right-click on the Project folder
3. Select Edit Options...
4. Select the Common configuration
   
5. Click on Linker
6. Double click on Section Placement Macros
   
7. The Section Placement Macros window will open:
   

-Amanda