Problem when switching role from peripheral to central on S120

[Andreas]

Hi,

I am now on implementing a dynamic change between the 2 possible roles central and peripheral. I try to do this like described here: nordicsemi.com/question/35367... But when trying to switch from peripheral to central, I always get an error on the SOFTDEVICE_HANDLER_INIT() function. My ble_stack_init() function looks like this:

static uint32_t ble_stack_init(uint8_t role)
{
uint32_t err_code;
	ble_uuid128_t base_uuid = DEVICE_PERIPHERAL_BASE_UUID;

	// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL);

// Enable BLE stack 
	ble_enable_params_t ble_enable_params;
    memset(&ble_enable_params, 0, sizeof(ble_enable_params));

	if(role == BLE_GAP_ROLE_PERIPH) ble_enable_params.gatts_enable_params.service_changed = IS_SRVC_CHANGED_CHARACT_PRESENT;
	else if (role == BLE_GAP_ROLE_CENTRAL) ble_enable_params.gatts_enable_params.service_changed = false;
#ifdef S120  
  ble_enable_params.gap_enable_params.role              = role;
#endif    
	err_code = sd_ble_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);
	
	if(role == BLE_GAP_ROLE_PERIPH)
	{
		err_code = sd_ble_uuid_vs_add(&base_uuid, &m_base_uuid_type);
		APP_ERROR_CHECK(err_code);
	}
	
	err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
	APP_ERROR_CHECK(err_code);
	
	if(role == BLE_GAP_ROLE_PERIPH)
	{
		// Register with the SoftDevice handler module for BLE events.
		err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
		APP_ERROR_CHECK(err_code);
	}
	return err_code;
}

Before I call this ble_stack_init() function, I disable the softdevice with:

err_code = sd_softdevice_disable();

SOFTDEVICE_HANDLER_INIT() returns error code 4097. For me this does not look like a valid error code. The documentation for that function says, that SOFTDEVICE_HANDLER_INIT should be called only once. So, how to achive the switch between the roles? Is there a working example with the S120 where the role is switched somewhere in the application?

Regards, BTprogrammer

[Petter Myhre]

It is not valid. It is returned by softdevice_handler_init()? Have you turned off optimization? Could you try to debug and see from where in softdevice_handler_init() this error is set?

[Andreas]

Ok, by stepping through the code with the debugger, I can see that the error is thrown from the sd_softdevice_enable(clock_source, softdevice_assertion_handler); function in softdevice_handler.c. I think, because SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL); is a macro, the debugger can not resolve that properly. Nevertheless, for me 4097 is not a valid error code. Are there any other preconditions that have to be setted properly to switch the role?

[Petter Myhre]

Have you turned off optimization? Could you try to debug and see from where in softdevice_handler_init() this error is set?

[Andreas]

Hello Petter, I have turned off all optimizations. The error is thrown from sd_softdevice_enable(clock_source, softdevice_assertion_handler);. It happens in softdevice_handler_init() (softdevice_handler.c).

[Andreas]

Is it possible, that the error code can not be resolved properly because it is part of a macro? (SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL);)