They aren't cheap but you could always use an fpga.
On Thu, Feb 22, 2018, 7:35 PM Chuck McCown <ch...@wbmfg.com> wrote:
> No, I saw it, but I already had the Pi so I ignored it and hoped for the
> I tried it first with arduino. Just not enough speed. And it had the
> jitter problem too.
> I have a method using three TTL/CMOS chips that is going to work... I
> The only thing separating the gps disciplined signal and the T1 will be a
> D flip flop and a few AND/NAND gates. So that ought to get me super low
> Trying for stratum I with rubidium hold-over isochronous performance at
> the end of the day. For cheap.
> *From:* Forrest Christian (List Account)
> *Sent:* Thursday, February 22, 2018 6:27 PM
> *To:* af
> *Subject:* Re: [AFMUG] OT Raspberry PI
> Ok, I think you missed this portion of my email last time:
> *"I'm skeptical that you'll be able to generate a bitstream with enough
> accuracy under Linux, without extreme programming measures.I'd suggest a
> digilent chipkit wifire and the arduino ide for this. You should be able
> to bitbang at least a T1 with this processor (500mhz)"*
> Generally the raspberry pi is great for 'tiny server stuff', or 'user
> interface' stuff, and the arduino and/or microcontrollers will work better
> for what you're looking at, since there isn't an operating system in the
> way. All arduino really is is a c++ ide with some simplified libraries.
> The wifire product I mentioned is really a PIC32MZ dev board, optimized
> for arduino. If you've had enough of the arduino ide, you can download the
> microchip ide and program it with a full development kit.
> Honestly for what you are talking about a EUSART in even a low end PIC
> might be able to handle this. If you program the EUSART into synchronous
> mode you'll just have to stuff a byte into it every 8 bit times and it will
> clock it out for you. Not sure if the clock rate is adjustable enough for
> you, but if you get a PIC with the NCO peripheral you might be able to
> dynamically adjust the frequency enough to make it work.
> NCO app sheet:
> On Thu, Feb 22, 2018 at 3:48 PM, <ch...@wbmfg.com> wrote:
>> Anyone know how to get my program to run on bare metal?
>> Or at the very least tell Linux that my program is the most important
>> thing in the world and service it above all other things.
>> I am trying to create a timing signal with the Pi. It is doing it but
>> the jitter is pretty bad.
>> I have researched trying to use an interrupt but there is a pretty low
>> limit on how many times per second you can fire a hardware interrupt.
>> Too low for my application.
> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.*
> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
> forre...@imach.com | http://www.packetflux.com
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