Programming BLE nrf51822AA beacon

RE: Programming BLE nrf51822AA beacon

MartinBL — Sun, 25 Oct 2015 10:31:46 GMT

Have you tried a simple blinky example without softdevice?

Have you tried a regular BLE example with softdevice, but without DFU, like e.g. the ble_app_hrs example? Here is a nice tutorial: Setting up an example project on the nRF51 DK.

RE: Programming BLE nrf51822AA beacon

vineeshvs — Sat, 24 Oct 2015 15:52:02 GMT

Thanks Martin Børs-Lind

I replaced the line SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_8000MS_CALIBRATION, NULL); with SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION, NULL);

Still it is not getting detected!!

RE: Programming BLE nrf51822AA beacon

MartinBL — Sat, 24 Oct 2015 15:29:36 GMT

Hi. According to the datasheet your module is missing an external low frequency 32kHz crystal (see page 4). This crystal is optional, but you will have to configure your example to use the internal RC oscillator instead. An LF clock is required to provide accurate timing necessary to drive the BLE protocol. By default, in e.g. the regular ble_app_hrs example, the LF clock is configured this way:

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, NULL);

and you should write e.g.:

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION, NULL);

instead.

I'm not a 100% sure about this, but I believe all the DFU examples assumes you have an external LF crystal and that is why it doesn't work. Try to experiment with the non-DFU examples and see if you can get it working. Afterall, DFU can be quite complicated stuff.

Relevant post.