MBH7BLZ02 not working

[mbozic]

Hi,

I have PCA10028 dev board and Fujitsu MBH7BLZ02 BT module.

I have successfully modified some sample code and when I flash it to nRF module on the PCA board, the code works. I can scan and connect to nRF and use it normally.

Now I'm trying to flash that code to MBH7BLZ02. I've connected MBH to PCA board over debug out connector. I can see the module as nRF51822 in nRFgo Studio, I can flash SoftDevice and application successfully, but MBH module is not seen on scanning. I use S110 for SoftDevice. I've tried S130 too but with same results.

I've also tried to set: SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM, false); in static void ble_stack_init(void) ...with no luck.

My MBH module is connected directly via wires to PCA board since I need to do some testing first, but it seems I just can't get it to work(or advertise).

Am I missing something?

Thank you!

Best regards, Mladen

[mbozic]

Hi,

From nRFgo Studio.: nRF51822 QFAAG00 (0x003c)

It works with NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM! I used a wrong hex file when flashed MBH 1st time I tried changing those.

Where can I read about NRF_CLOCK_LFCLKSRC settings? I have no idea what any of the possible values mean. MBH should have an external oscilator at 16MHz. Or am I wrong?

Thank you!

[MartinBL]

Yes, that is correct. Remember that, as stated in the link, a synthesized clock requires the 16 MHz clock to be running at all times and hence consumes more power than using the LFRC.