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XMEGA DFLL USBSOF needs manual COMP tuning - why?
steve17 wrote: I doubt there would be any more problems with the USB3 ports than the USB2 ports.  I would think USB3 ports must obey USB2 rules when a USB2 device is plugged...
Thursday, 13 June 2019 - 08:33
XMEGA DFLL USBSOF needs manual COMP tuning - why?
Oh, I should clarify, I was not talking about wake-up from sleep, I was talking about the initial plug-in and power up of a bus-powered device with a USB 3.0 port.
Wednesday, 12 June 2019 - 10:21
XMEGA DFLL USBSOF needs manual COMP tuning - why?
steve17 wrote:Actually I find that it is unnecessary to even think about putting the correct value into CALA.  This could be a little more pain than it is worth.  I...
Wednesday, 12 June 2019 - 08:41
Fine tuning a crystal in code
sparrow2 wrote:There is no need to calibrate just a need to know the speed. If I have a board with the AVR, a 5V regulator and 32768Hz crystal and put it in a climate chamber...
Monday, 27 May 2019 - 13:59
Fine tuning a crystal in code
I did try this but it's not great.   First you have to calibrate the crystal. That is tricky because you need to measure the error and the temperature of the crystal...
Friday, 24 May 2019 - 12:36
Fine tuning a crystal in code
I was impressed by the "Wave Ceptor" watches they make. Some are full 6 band, i.e. world-wide coverage of low frequency time codes.   About accuracy, I think millisecond...
Friday, 24 May 2019 - 09:42
Fine tuning a crystal in code
Who-me wrote: mojo-chan wrote: I build something like that years ago. I had an app for a Nokia with Symbian OS that would flash the screen. A photodiode on the clock could read...
Thursday, 23 May 2019 - 07:45
Fine tuning a crystal in code
meslomp wrote:note that you indeed have a 11 minutes change in a year, but you will be adjusting your clock 2 times a year for daylight savings time and back.   I've just...
Wednesday, 22 May 2019 - 09:05
Fine tuning a crystal in code
clawson wrote: Could you use a proxy for the time? Have your smartphone's own mobile/wifi/GPS antenna get time from whichever signal it can find and trust then (presumably with...
Wednesday, 22 May 2019 - 09:04
Fine tuning a crystal in code
lautman wrote: mojo-chan wrote: use a TCXO.   Yeah, this is my backup.  I haven't thought that much about it yet as I'm still trying to figure out if I can get a...
Wednesday, 22 May 2019 - 09:01
Sampling rate + reconstruction question
Torby wrote: Well, Nyquist says you need to sample 2 times the max frequency you are interested in.   Indeed, but with the important caveat that it is 2x the max frequency...
Wednesday, 22 May 2019 - 08:56
Fine tuning a crystal in code
ki0bk wrote: mojo-chan wrote: In the end I resorted to syncing in the middle of the night when the signal was best.   Yes, VLF propagation is best at night, as long as you...
Tuesday, 21 May 2019 - 14:44

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