SOFTDEVICE_HANDLER_INIT

RE: SOFTDEVICE_HANDLER_INIT

rcfr — Thu, 15 Dec 2016 17:01:10 GMT

Thanks Petter, I'll will try it.

RE: SOFTDEVICE_HANDLER_INIT

Petter Myhre — Thu, 15 Dec 2016 12:42:37 GMT

I see. I wasn't aware of that. Have you tried with the RC? Be aware that the RC uses draws more current.

RE: SOFTDEVICE_HANDLER_INIT

rcfr — Wed, 14 Dec 2016 15:31:05 GMT

Petter, I'm assuming that this initialization time is to complete the ble_stack_init(), acording to this post: devzone.nordicsemi.com/.../ The device is on poweroff, and one pulse in one pin is waking the device, and after the initialization, it should read one byte of the uart. In the other device that is sending the data, I've to put one timer to send the data only after 450 to 500ms, so the first device can read it.

Best regards.

RE: SOFTDEVICE_HANDLER_INIT

Petter Myhre — Wed, 14 Dec 2016 14:50:03 GMT

I don't understand. Why would changing to RC help? What exactly is taking more time? Do you mean completing the ble_stack_init() function? How are you testing this?

RE: SOFTDEVICE_HANDLER_INIT

rcfr — Wed, 14 Dec 2016 14:03:45 GMT

Thanks for the response Petter. Actually the examples use the 20ppm, I've tried to use the 250ppm, sorry for this another confusion. So if i want a faster initialization I should use the RC source?

RE: SOFTDEVICE_HANDLER_INIT

Petter Myhre — Wed, 14 Dec 2016 13:54:05 GMT

The LF crystal on the nRF52 DK (PCA10040) is 20 ppm. The correct way to use it is the way it is used in the SDK examples.

RE: SOFTDEVICE_HANDLER_INIT

rcfr — Wed, 14 Dec 2016 13:47:44 GMT

Thanks for the response Petter, I've made a little confusion, it really tells the accuracy of the crystal. I'm using the nRF52 Development Kit(PCA10040), so the accuracy should be 250 ppm, right? But I've been reading some questions and some answers tell to use 20 ppm. Reading the documents of the API specification I've founded that the right way to use the SOFTDEVICE_HANDLER_INIT was the first one that I've posted, but the second way compiled and I've got faster initialization. I'm using SDK 12.1. I can use the NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM in the PCA10040 and it will initialize faster? If so, what is the right way to use it?

Best Regards.

RE: SOFTDEVICE_HANDLER_INIT

Petter Myhre — Wed, 14 Dec 2016 12:42:20 GMT

Change the accuracy of the calibration? You are not changing the accuracy of the calibration, you are changing what you tell the SoftDevice that the accuracy of the LF crystal you have connected to the nRF52 device is. It doesn't really make change that, it should match with the spec if the crystal.

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LF_XTAL_ACCURACY_250_PPM, NULL); doesn't look like it's from SDK 12.1.