It could be the serial port, that makes some sense, I guess.

I installed a jumper feeding 3.3v on J4 pin 1, and the MRAM still
works, but the 5043s still don't.

I think I found it.  R10 and R11 are not populated.  One of them says
330 ohms, one says zero.  What needs to be put here?  I think I have
some SM resistors, but probably 0603, and these look smaller.

-corey

> Ok, I got both mails.  One thing I notice is that there is some backflow of
> power from the serial line which lights the LED (dimly) even if the
> LaunchPad is unpowered.  Could that be the reason for the 2.7V?  I have
> those jumpers installed on both halves of the board, but I'm surprised the
> MRAM works at all if you don't have it installed (maybe that 2.7V is
> enough---and I don't see how that relates to the 5043).

On Tue, May 9, 2023 at 9:41 AM Corey Minyard <minyard@acm.org> wrote:
>
> I send this from my acm.org account and realised it's not going to get
> to the pacsat mailing list.  So here it is again.
>
> On Tue, May 9, 2023 at 9:39 AM Corey Minyard <minyard@acm.org> wrote:
> >
> > On Tue, May 09, 2023 at 09:28:06AM -0400, Burns Fisher (AMSAT) wrote:
> > > Ok, glad the MRAM is working.  Any chance that you don't have the two
> > > jumpers on the LaunchPad required to power the 5043s?  These would be a
> > > pair on the right (components up, USB down, I think) just below the bottom
> > > set of pins.
> >
> > Yes, the two jumpers labeled +5V and +3V3 right by J1 are both installed.
> > I'm getting 3.3V on J1 pin 1 and 5V on J1 pin 2.
> >
> > There are unpopulated jumpers on the LaunchPad by J4 (J6 on the
> > Laumchpad) that have the same labels.  I'm getting 2.7V on J4 pin 1,
> > which is strange.  That's what powers the MRAMs and the temperature
> > sensor.
> >
> > Should I put a jumper on 3V3 by J4?  I'm getting 3.3V on the other side
> > of the jumper.  I'm wondering if the power is somehow coming through the
> > 5043s and getting to the MRAMs, but I don't see how that could happen.
> >
> > >
> > > BTW, I don't even try to push Jim's board all the way on.  It is tight as
> > > it is and I want to be able to get it back off (relatively) easily.    But
> > > regardess, the tops of the pins are all level, even though the newly
> > > soldered pins have a plastic holder at the bottom and the original pins do
> > > not.
> >
> > Yeah, strange.  I didn't notice until I tried to put the board on.  My
> > board now looks terrible, but it seems to be making good contact now.
> >
> > I looked at close-up pictures on TI's web site, and the pins I had look
> > the same as the ones in the picture.
> >
> > -corey
> >
> > >
> > > 73,
> > >
> > > Burns Fisher, WB1FJ
> > > *AMSAT(R) Engineering -- Flight Software*
> > >
> > >
> > > On Mon, May 8, 2023 at 11:52 PM Corey Minyard via pacsat-dev <
> > > pacsat-dev@amsat.org> wrote:
> > >
> > > > Burns sent me the info on that.  I ran J5 pin 12 to a via on the
> > > > bottom right of U1.  After doing that wiring change, all but one MRAM
> > > > appears to be working.  It looks like R5 got removed somehow, I may
> > > > have done that removing the wire.  I just installed a bridge there,
> > > > since it's a zero-ohm resistor, and the mram seems to be working now.
> > > >
> > > > The temperature sensor on the daughter board seems to be working.
> > > >
> > > > I don't think the 5043's are working.  I'm not getting anything on
> > > > transmit, and I eventually get:
> > > >
> > > > Pacsat>send pb status
> > > > ## SELF TEST: pb_test_status
> > > > TX QUEUE FULL: Could not add UI frame to Packet Queue
> > > > PB Empty.
> > > > ## PASSED SELF TEST: pb_test_status
> > > >
> > > > after running that a few times.  At startup, I'm getting:
> > > >
> > > > ERROR: In start_rx, axradio_init returned: 5
> > > > ERROR: In start_tx, axradio_init_70cm returned: 5Initializing PB Task
> > > > ERROR: Failed in init PB Status Timer
> > > >
> > > > -corey
> > > >
> > > > On Mon, May 8, 2023 at 9:51 PM Jim McCullers via pacsat-dev
> > > > <pacsat-dev@amsat.org> wrote:
> > > > >
> > > > > Chris,
> > > > >
> > > > > Please take a look at the email I sent out earlier.
> > > > > There is the possibility of a wiring error on the board with my white
> > > > wire correction.
> > > > >
> > > > > As for the connectors being longer, I never noticed that and these
> > > > should be the same connectors I sent Burns and Chris.
> > > > > Burns say the MRAM is working after the wiring change and the AX5043s
> > > > are working for Chris and Burns so not certain there.
> > > > >
> > > > > Attached is the revised schematic.  I'll have the Kicad files on github
> > > > hopefully tomorrow.  Have a couple of issues to deal with.
> > > > >
> > > > > Jim McCullers
> > > > > WA4CWI
> > > > >
> > > > >
> > > > >
> > > > > I sent this earlier, but just to Chris.
> > > > >
> > > > > I got my board today and soldered on the connectors.  Looking at the
> > > > board now, I see that the connectors that came with the launchpad are
> > > > around 1cm longer than the ones Jim supplied.  I can't get the mram or
> > > > ax5043s to be detected.  I don't think it's making good contact on the
> > > > connectors, for obvious reasons.  Do I need to trim the old connector, or
> > > > did I do something wrong?
> > > > >
> > > > > I clipped the pins, and still no help.  The power light by the serial
> > > > connector works, and the serial port works.  But the mrams and the ax5043's
> > > > are not there.
> > > > >
> > > > > I can't find the schematics in the git repository.  PacSatDocs, I
> > > > assume.  I guess I need to start debugging to figure out what is wrong.
> > > > >
> > > > > -corey
> > > > >
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