nrf51822 QFAB R7 programming issue from nrf51 DK

RE: nrf51822 QFAB R7 programming issue from nrf51 DK

Marco Russi — Wed, 24 Feb 2016 23:12:30 GMT

Hi, thanks a lot. It works now. I didn't considered the second external crystal. Thanks!

RE: nrf51822 QFAB R7 programming issue from nrf51 DK

Vidar Berg — Mon, 22 Feb 2016 10:24:59 GMT

Yes. the softdevice will wait indefinitely for the crystal to start up if configured to use a non-existent LF crystal. Please try to change the following line in ble_stack_init():

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL);

to:

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_4000MS_CALIBRATION, NULL);

This configures the softdevice to use the internal RC oscillator instead of the crystal.

RE: nrf51822 QFAB R7 programming issue from nrf51 DK

Marco Russi — Mon, 22 Feb 2016 10:19:18 GMT

Hi, do you mean an external 32KHz crystal? I can not see any in the schematics. I haven't tried to debug yet but thanks for suggesting, I'll try it.

RE: nrf51822 QFAB R7 programming issue from nrf51 DK

Vidar Berg — Mon, 22 Feb 2016 10:12:52 GMT

Just to be sure, can you confirm that you have the 32Khz crystal as well? This and the linker settings are the two most common mistakes when porting code from the DK to a custom board in my experience.

Have you set up GDB or similar so you can debug the FW on your board? Then you could see where the program may be stuck or maybe asserting.

RE: nrf51822 QFAB R7 programming issue from nrf51 DK

Marco Russi — Mon, 22 Feb 2016 09:52:34 GMT

Hi, the schematic is the same of the DK, there is an external 16MHz crystal. I have the hex file of another software previously developed for that board and it seems it works fine. This means that the board is ok. Could it be anything else? Thanks.

RE: nrf51822 QFAB R7 programming issue from nrf51 DK

Vidar Berg — Mon, 22 Feb 2016 09:47:20 GMT

Hi,

The linker settings looks correct for your chip variant. But does your board have a external crystal for the LF clock? If not you need to make sure to use the internal RC oscillator in your code. Clock source is set in the BLE stack init routine.