[time-nuts] WWVB teensy BPSK early experiments

Sun Nov 15 14:08:03 UTC 2020

John
Yes I did go through the code looking for the touch screen. Like you I
wanted to know how it was used. What magical stuff might it allow. Well
none. :-)
It does take at least 2 good decodes to display time as I recall.
Regards
Paul.

On Sun, Nov 15, 2020 at 3:06 AM John C. Westmoreland, P.E. <
john at westmorelandengineering.com> wrote:

> Hello Time Nuts/Paul,
>
> Yes - I know you have said that - the point was/is I wasn't sure there was
> something in the code or not that could be calling some of the
> touch screen functions - if you said you scrubbed that and I didn't
> understand - thanks for doing that.
>
> I was wondering - using the Stormwise antenna in inductive coupling mode -
> I got at least one good decode cycle - but the TFT/Teensy
> evidently froze - I wasn't getting the serial port dump - the Teensy
> appeared to be locked up - no LED blinks, etc:
>
>
> https://user-images.githubusercontent.com/2308903/99171441-ee159b80-26bd-11eb-8b1f-062ce90a1265.jpg
>
> Good news is that evidently at least one good decode cycle took place (CH
> code) or maybe it was in the process of completing one good decode cycle.
>
> 73's,
> John
> AJ6BC
>
>
> On Fri, Nov 13, 2020 at 10:40 AM paul swed <paulswedb at gmail.com> wrote:
>
> > John I mentioned in an earlier post the touchscreen is not used and there
> > is nothing in the code that I see. I have no wires connected. Display is
> > stable.
> >
> > On Fri, Nov 13, 2020 at 11:09 AM John C. Westmoreland, P.E. <
> > john at westmorelandengineering.com> wrote:
> >
> > > Hello Time Nuts,
> > >
> > > Paul, the wiring harness I made is longer than 6" - not by much - but
> > I'll
> > > shorten those and see if it clears it up.
> > > I thought the same thing - maybe the display could be flaky - or maybe
> > > strange things can happen too if in
> > > the software the touch screen part is enabled but the wiring isn't
> there
> > -
> > > not sure.  But, can't rule that out right
> > > now - will double check to see if in the code the touchscreen part is
> > > running or not.
> > >
> > > I'm also checking the CHIP_MIC_CTRL register in my code - I wanted to
> see
> > > if disabling the micbias block could work -
> > > the register can be written/changed - in the control_sgtl5000.cpp file
> -
> > in
> > > the micGain() function -
> > > change:
> > >
> > > return write(CHIP_MIC_CTRL, 0x0170 | preamp_gain)
> > > to
> > > // return write(CHIP_MIC_CTRL, 0x0070 | preamp_gain)
> > >    // attempt to disable mic bias block --- aj6bc/jcw
> > > or
> > > return write(CHIP_MIC_CTRL, 0x0000 | preamp_gain)
> > >
> > > If you want to read that back - then:
> > > in control_sgtl5000.h - move:
> > >  unsigned int read(unsigned int reg); // removed from protected:
> > >
> > > from protected to public:
> > >
> > > and in your code you can call something like:
> > > // check value of mic control register:
> > >   mic_ctl_regval = sgtl5000_1.read(CHIP_MIC_CTRL);
> > >   Serial.printf("\r\nMic Control Register (ADDR 0x002A) = 0x%x \r\n",
> > > mic_ctl_regval);
> > >
> > > you may need to:
> > > #define CHIP_MIC_CTRL      0x002A // microphone gain & internal
> > microphone
> > > bias
> > > at the top of your file.
> > >
> > > I'm still not sure if that's OK to do - I think the chip is looking
> for a
> > > feedback on that possibly and it doesn't really buy you much.
> > > I'm still testing all of that now - maybe just being able to read that
> > > register back is worth something.
> > >
> > > I received the antenna from Stormwise and am using in an inductive
> > coupling
> > > mode with the Teensy set up - and I got the first
> > > successful decode using the code from Chris Howard - so good job there
> > > Chris.  Gotta admit it's pretty cool watching the inductive
> > > coupling effect work.
> > >
> > > It's apparent I still have some noise - I haven't done a lot yet for
> > > shielding anything, so I obviously need to do that - good news
> > > obviously is finally seeing some good decodes coming in.
> > >
> > > Of course, this is in the quiet wee-hours but WWVB is pretty strong at
> > this
> > > time at my QTH.
> > >
> > > I'll work on ways to reduce noise next.
> > >
> > > 73's,
> > > John
> > > AJ6BC
> > >
> > >
> > >
> > >
> > >
> > >
> > > On Wed, Nov 11, 2020 at 12:21 PM paul swed <paulswedb at gmail.com>
> wrote:
> > >
> > > > I kind of wonder if you don't have a flakey display. I did not add
> the
> > > > terminating R and everything has always worked fine on the display.
> > > After I
> > > > quit using the 3" jumper cables to the audio card and stacked the
> > > modules,
> > > > the audio worked correctly.
> > > > My display is on a set of 6" jumpers and has been stable from day
> one.
> > > > Though currently the display isn't connected since I am experimenting
> > > with
> > > > various modules in the teensy.
> > > > Regards
> > > > Paul
> > > > WB8TSL
> > > >
> > > > On Wed, Nov 11, 2020 at 10:47 AM Graham / KE9H <
> ke9h.graham at gmail.com>
> > > > wrote:
> > > >
> > > > > John:
> > > > > I suggest you try Chris Howard's
> > > > > https://github.com/chris-elfpen/Teensy4WWVBsdr
> > > > > You might have to adjust the I/O pins for Teensy 4.1 vs 4.0
> > > > > I am having no problems with the display once I put in the source
> > > > > termination resistor.
> > > > > Been running for multiple days, so far.
> > > > > --- Graham
> > > > >
> > > > >
> > > > >
> > > > > On Tue, Nov 10, 2020 at 9:45 PM John C. Westmoreland, P.E. <
> > > > > john at westmorelandengineering.com> wrote:
> > > > >
> > > > > > Hello Time Nuts,
> > > > > >
> > > > > > I've been running some tests - I just had the screen 'white-out'
> > > > problem
> > > > > > happen again - I have a termination resistor on the SCK line (pin
> > 13
> > > on
> > > > > the
> > > > > > Teensy 4.1) -
> > > > > > so it appears this is related to the TFT screen updates - maybe a
> > > pixel
> > > > > > write going out of bounds.  The Teensy is still running - but the
> > > > screen
> > > > > > can't be read.
> > > > > >
> > > > > > Note the current code I'm testing is here in case anyone is
> > > interested
> > > > -
> > > > > > it's from the PJRC forum:
> > > > > > https://github.com/jwestmoreland/el_supremoWWVBsdr
> > > > > >
> > > > > > 73's,
> > > > > > John
> > > > > > AJ6BC
> > > > > >
> > > > > >
> > > > > >
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