any raspberry pi people here?

DecadentLinuxUserNumeroUno@decadence.org wrote in news:tc36r3$14r9$1
@gioia.aioe.org:

> albert@cherry.(none) (albert) wrote in
> news:nnd$224d213a$6ed2eb7a@d7dff6696c7ccdd2: 
> 
>> In article <ilhbdhp4i6lcl486j5u3gijh9a7mbrej9c@4ax.com>,
>> John Larkin  <xx@yy.com> wrote:
>>>On Mon, 18 Jul 2022 22:23:21 +0300, Dimiter_Popoff
>>><dp@tgi-sci.com> wrote:
>>>
>>>>On 7/18/2022 22:13, John Larkin wrote:
>>>>>
>>>>>
>>>>> The pi doesn't seem to have any general counter/timer hardware,
>>>>> like ARMs usually do. I've seen vague references to using the
>>>>> GPU to do timings.
>>>>>
>>>>> I'd like to measure frequencies and timestamp some edges, in
>>>>> the 1 us sort of domain, several channels. I guess we could
>>>>> hang a small FPGA off to the side if pi can't do it.
>>>>>
>>>>> Do pi's have crystal oscillators? I guess we could add one too.
>>>>>
>>>>>
>>>>>
>>>>
>>>>Are you serious about using yet another aliexpress toy for some
>>>>real design?
>>>
>>>https://en.wikipedia.org/wiki/Raspberry_Pi
>>>
>>>Not exactly a toy. But it would save us using up our stock of
>>>FPGAs and ARM chips, and I know a guy who would like to do the
>>>programming. He's a retired Fellow of United Technologies
>>>(Collins) who really likes to code.
>>>
>>>
>>>>Other than the obvious question above, does not ARM have some
>>>>sort of timebase register as part of the core? This might be
>>>>usable to some extent, depending on how much jitter you can
>>>>tolerate.
>>>
>>>The ARM in the pi seems to have none of the usual counter/timer
>>>stuff, so we'd have to do that externally, in a small FPGA
>>>probably. We might have three frequency counters and maybe six
>>>edge time stampers in a FIFO or something. Pretty simple.
>> 
>> The Raspberry pi 1 has a 64 bit counter offset 0x9100 in the
>> Virtual Memory IO Space
>> This is the Forth code, fetching a double precision number
>> of the addres
>> 
>>: TICKS   ^clk 2@ ;
>> 
>> This seems to be more reliable of the counters in the Intel.
>> It is running at 1 Mhz.
>> Others pi's (Orange pi) have similar counters.
>> 
>>>
>>>Some torque sensors make tricky timing waveforms.
>>>
>> 
>> Groetjes Albert
> 
> Check out the new pico W rPi...
> 
> <https://www.raspberrypi.com/news/raspberry-pi-pico-w-your-6-iot-
> platform/>
> 

  Even better!

<https://www.raspberrypi.com/products/raspberry-pi-zero-2-w/>