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).

73,

Burns Fisher, WB1FJ
AMSAT(R) Engineering -- Flight Software


On Tue, May 9, 2023 at 10:42 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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