NRF24LE1

RE: NRF24LE1

ovrebekk — Mon, 24 Jun 2019 07:28:08 GMT

You welcome, happy to help 🙂

RE: NRF24LE1

r_nin — Fri, 21 Jun 2019 13:23:13 GMT

I seem to understand what's the matter. If I write 128 I get 1.25 seconds if 1280 - 10.25 seconds, if 12800 - 100.25 seconds. Probably it is in the acceleration of the generator on quartz 32 kHz (in the datasheet it is written that it takes up to 0.5 seconds). I consider the question closed. Thank you !!!

RE: NRF24LE1

ovrebekk — Thu, 20 Jun 2019 10:38:05 GMT

Yes, I was asking for the other case. What happens when you set it to 96?

Do you get exactly 1 second?

RE: NRF24LE1

mark_l — Wed, 19 Jun 2019 18:34:37 GMT

Can you use a scope to precisely measure your timing period? This will give you a better idea of what is going on in terms of actual magnitude. There seems to be a fair amount of slop in your numbers with what you've been saying.

If you are getting 1.25 seconds at 128, then your clock is running 20% slow. Using 96 as your divider is 0.75 correction, meaning you should be running a tad fast (0.94sec)

The effects of incorrect loading on a crystal can come in many forms, from slight shifts, to more extreme results depending on how the waveform is affected.

RE: NRF24LE1

r_nin — Wed, 19 Jun 2019 16:56:26 GMT

on 25%?

RE: NRF24LE1

r_nin — Wed, 19 Jun 2019 16:55:41 GMT

yes.at 128 I get 1.25 seconds

RE: NRF24LE1

mark_l — Wed, 19 Jun 2019 15:48:44 GMT

One thing to consider is that your crystal circuit is not running at 32KHz. If the loading on the crystal is not correct, it will result in a shift in frequency.

RE: NRF24LE1

ovrebekk — Wed, 19 Jun 2019 08:08:12 GMT

Are you saying you get a 1 second watchdog timeout if you enable the wathdog with 96 instead of 128?

RE: NRF24LE1

r_nin — Tue, 18 Jun 2019 15:45:54 GMT

"The start-up time is typically less than 0.5s for a crystal" but 32 kHz oscillator runs continuously during memory retention mode

RE: NRF24LE1

r_nin — Tue, 18 Jun 2019 15:38:27 GMT

RTC2...

RE: NRF24LE1

r_nin — Tue, 18 Jun 2019 15:37:55 GMT

The internal generator works with great accuracy (as it should). I need a RTS for other purposes. I just need a watchdog. You have to write not hal_wdog_init (128), but hal_wdog_init (96).

RE: NRF24LE1

ovrebekk — Tue, 18 Jun 2019 12:43:29 GMT

Hi Igor

That is interesting. Do you get the same result if you use the internal RC oscillator?

In general I would suggest using the watchdog to generate timer interrupts, the idea is to use the RTC2 or one of the TIMER modules for this.

Best regards
Torbjørn

RE: NRF24LE1

awneil — Tue, 18 Jun 2019 08:29:45 GMT

how to properly post source code: