Re: [casper] ROACH2 compile error

Heh. See this bug report that after 6 years I guess I decided it was time to give up on. https://github.com/casper-astro/mlib_devel/issues/7 Reopened. Check back in 6 years to see if it's fixed! Thanks for the report back. On Mon, 11 Mar 2019 at 06:20, Heystek Grobler wrote: > Hey Adam and Ja

RE: [EXTERNAL] [casper] seeking high accuracy GPS disciplined time/frequency standards ?

John, Dan etc, I spent some time following the Time Nuts list about ten years ago. The consensus there was that if you use GPS to discipline an oscillator, then you want to run the GPS correction signal through a really long time constant low-pass filter, about ten hours. That lets it average o

Re: [casper] Timestamp in ROACH2 and PTP

Hi David, Dan, Thanks for the explanation, my English failed me this time around (problems of a non-native speaker ¯\_(ツ)_/¯ ) Regards, Franco On Mon, Mar 11, 2019 at 1:19 PM Dan Werthimer wrote: > > hi franco, > > > i think we picked the word "arm" because it's similar to arming a gun, > get

Re: [EXTERNAL] [casper] seeking high accuracy GPS disciplined time/frequency standards ?

Hi Dan. I've been thinking about this a bit over the weekend, and I think the problem can be solved by dividing the problem. I think the frequency standard should not be coupled to GPS, rather a free-running rubidium or better oscillator could provide sufficient frequency stability and could also

Re: [casper] Timestamp in ROACH2 and PTP

hi franco, i think we picked the word "arm" because it's similar to arming a gun, getting it ready to fire, but not firing it. "arm" is not the signal that directly resets the elapsed time counter. the arm signal is a software command that says: on the next 1 PPS, the elapsed time counter shoul

Re: [casper] Timestamp in ROACH2 and PTP

Hi, Franco, > On Mar 11, 2019, at 07:37, Franco wrote: > > why you call "ARM" the signal/register that resets the time-tracking counter? One of the many definitions of the verb “to arm” is... to equip or prepare for any specific purpose or effective use: to arm a security system; to arm onese

Re: [casper] Timestamp in ROACH2 and PTP

Hi, Yes! Very clear. Thank you very much James, Jack and Dan. Just the last little question, why you call "ARM" the signal/register that resets the time-tracking counter? Thanks, Franco On Mon, Mar 11, 2019 at 4:27 AM James Smith wrote: > Hello Franco, > > Jack's email explained more explic

Re: [casper] ROACH2 compile error

Hey Adam and Jack I mannaged to solve the problem. The GPIO block for was set for the wrong platform. It was set on ROACH1 and not ROACH2. Thanks for all the help! Heystek On Sat, Mar 9, 2019 at 12:27 AM Jack Hickish wrote: > Hi Heystek, > > Adam's right. I think this is potentially a bug in

Re: [casper] Timestamp in ROACH2 and PTP

Hello, We use a different scheme for datation, not using any GPS. Our ROACH2 is bind to a rubidium clock, then: 1/ Each 8K acquisition packet is taged with a 64 bits counter in the FPGA reset only at firmware init. The acquisition is continuous, the dispatching of relevant data is delegated to

[casper] Re: CASPER Hardware Porting Workshop 2019 - save the date and info

Dear Casperites, You will hopefully have notificed that the Hardware Porting Workshop registration form has been emailed to you - if not then please check spam folders. The official registration form link is: https://goo.gl/forms/m0UbN02xkURrJPlG2 I hope

[casper] CASPER Hardware Porting Workshop 2019 Registration Form

I've invited you to fill out the following form: CASPER Hardware Porting Workshop 2019 Registration Form To fill it out, visit: https://docs.google.com/forms/d/e/1FAIpQLSdltJaBKWDwGs-4L9l5fFH-XZJWvL2-J3hSRYEbokstmY8i1A/viewform?vc=0&c=0&w=1&usp=mail_form_link If you are keen to attend the CASPER

Re: [casper] Timestamp in ROACH2 and PTP

Hello Franco, Jack's email explained more explicitly what I tried to convey. Did it make it clear? Regards, James On Sat, Mar 9, 2019 at 12:44 AM Jack Hickish wrote: > Hi Franco, > > The general principle is generally this -- > > We assume that the system has > 1. A CPU-based control computer