uart on NRF51822

RE: uart on NRF51822

elisio — Wed, 03 Feb 2016 15:21:08 GMT

Thank you all, it's solved now.

When I compiled with one of the calibrated with RC options I also changed the second parameter of the function APP_TIMER_INIT to true and I got those warnings:

In function 'ble_stack_init': warning: passing argument 4 of 'softdevice_handler_init' makes pointer from integer without a cast SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM, true)

softdevice_handler.h:117:10: note: expected 'softdevice_evt_schedule_func_t' but argument is of type 'int' uint32_t softdevice_handler_init(nrf_clock_lfclksrc_t clock_source,

So I changed the parameter to NULL and it worked fine. Thank you all.

RE: uart on NRF51822

tesc — Wed, 03 Feb 2016 13:29:14 GMT

Are you sure the components are OK and everything is well soldered on the board with the nRF51822?

RE: uart on NRF51822

elisio — Wed, 03 Feb 2016 13:17:44 GMT

Hi, I have just the 16MHz crystal on my board. I did as you said and changed the NRF_CLOCK_LFCLKSRC_XTAL_20_PPM to NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION and also to NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION. But it's still not working.

I did other test and put an NRF51422 on a custom board, the same kind of board and peripherals of the one I tested with the NRF51822 chip, and it worked.

RE: uart on NRF51822

tesc — Wed, 03 Feb 2016 08:58:52 GMT

Edited to make whole code segment preformatted.

RE: uart on NRF51822

RK — Wed, 03 Feb 2016 00:56:55 GMT

Do you have a LF crystal on your board as well? You only mentioned the 16MHz one in your post. If you don't have one, then you'll need to change the NRF_CLOCK_LFCLKSRC_XTAL_20_PPM to one of the calibrated RC sources first.