Why am I getting INVALID_PARAM from sd_ble_gap_scan_start()?

[Artur]

I am trying to start scanning for devices. I have changed from the example (ble_app_mulitlink_central_s130_pca10028) only

• clock source to NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM
• instead of nRF51422 I have nRF51822 linked through Debug in ports to PCA10028
• CENTRAL_LINK_COUNT to 1, instead of 8.

I am trying to use SCAN_INTERVAL and SCAN_WINDOW values default from example. My m_scan_param:

static const ble_gap_scan_params_t m_scan_param =
{
     0,                       
     0,                       
     NULL,                    
     (uint16_t)SCAN_INTERVAL, 
     (uint16_t)SCAN_WINDOW,   
     0                        
};

define SCAN_INTERVAL                    0x00A0

define SCAN_WINDOW                     0x0050  

[Jørgen Holmefjord]

Hi,

How did you define the clock source? I testet this by adding your changes to the multilink central example in SDK 11, and I don't get any error codes.

Is there any reason why you want to use the synthesized LF clock instead of the RC oscillator?

Best regards,

Jørgen

[Jørgen Holmefjord]

You can use the RC oscillator with any board, you don't need an external crystal. Did you connect the board to the Debug In port or Debug Out? To flash the external board, you need to connect it to Debug out port, Debug in is for flashing the PCA10028 with an external debugger.