[time-nuts] wifi with time sync

[Bob Camp]

Hi

Maybe the magic stamping has been hiding in the chips all along. 
What’s pretty clear is that if it’s there, it’s well hidden ….

Bob

> On Jan 14, 2017, at 7:04 PM, jimlux <jimlux at earthlink.net> wrote:
> 
> On 1/14/17 3:32 PM, Bob Camp wrote:
>> Hi
>> 
>> 
>>> On Jan 14, 2017, at 5:29 PM, Scott Stobbe <scott.j.stobbe at gmail.com> wrote:
>>> 
>>> I don't think wifi is ever going to be a real-time system, as it shares the
>>> ether with all other ISM devices. That said even 1 ms of variation is still
>>> 4 orders of magnitude greater than the actual time of flight.
>>> 
>>> The precision time aspect will most certainly be done in hardware, even if
>>> it's just as simple as a timestamp of receiving the beacon frame.
>> 
>> My concern *is* that it’s going to be like 1588 in that respect. Off we all have
>> to buy new time stamping hardware. Until that’s all up and running
>> you don’t get the new timing stuff. Based on what I see, there’s not a lot
>> of hope for it otherwise.
>> 
> 
> 
> just rummmaging through some datasheets..
> I see that for the SG922-0007 (a WiFi module with AT command set) they do list a value that can be read for "timestamp of last received packet" and "timestamp of last transmitted packet"
> 
> 
> As to what those might mean??
> 
> A Copperhead WiFi shield for Arduino has a microchip MRF24WB0MA on it (it's a few years old, I think it's been replaced by something newer)
> 
> Microchip doesn't make it easy to find the SPI interface details, though.
> 
> 
> 
> 
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