This sounds like great progress Bob, well done.
Happy holidays
Chris
On Tue, Dec 19, 2023 at 10:24 PM Bob Stricklin via pacsat-dev <
pacsat-dev(a)amsat.org> wrote:
> *Here is an update on my progress checking out the QuadRxOneTx board.….*
>
> I got the power supply working properly with the chips Zack sent. Took
> some time to repair the things I did to debug the issue and get the small
> parts soldered on the board.
>
> When i powered up both supplies were working properly. I did add clamping
> Zener diodes across the outputs to provide some modest protection.
>
> Then I had to reinsert the programming resistors on the current limiting
> MAX4995 which I removed to isolate sections of the board.
>
> When I started testing one of the 3.3V supply sections was not powering up
> and the supplies were dropping out in a constant pattern. Found the issue
> was the Watch Dog was
> not dibbled and this was turning things off and back on in time. Disabled
> these. I also found I have the control logic which turns the power on and
> off reversed. This is another case of
> picking the correct logic on the watch dog chip by using the proper
> suffix. The one I specified is AL which I assume is Active Low and I needed
> active high. I disowned this and hard wire them
> all to be on for now. Will need to work on this more later. The watchdog
> chip can also be configured in different ways so all this needs to be
> worked when CPU is working.
>
> With all the board functional (minus the TMS570) still had a short on one
> 3.3v section. After some investigation I determine the short was in one or
> more memory chip. The
> data sheet for these indicated they are particularly sensitive. So I
> removed all four of them. After removal and some component testing I found
> only one of the four was
> Actually shorted. However with these off the board the power supplies were
> all functioning properly throughout the board.
>
> One troubling thing i noticed was with the short on the 3.3V supply if you
> jumped by the current limiter which I did to find the issue and removed the
> jumper that supply would jump up to about 3.8 volts and take a bunch of
> seconds to settle back down to 3.3V. This is a issue with a DC to DC
> regulator which is plus width modulated and adjusting to hold the output at
> a fixed level. Typically we will not have a short but if a temporary short
> were to happen in space the supply could over react and zap some other
> parts. Could put the clamping zener on for space use if we can find a good
> voltage to use but then these could become a failure point.
>
> None of the other chips on the board seem to have issues from over voltage
> now that the supplies are up and working but will need to test individually
> to be sure. The AX5043 have never been turned on yet.
>
> At this point with no CPU and no memory and the AX5043 all turned off the
> board is pulling about 25Ma of current. I should also manually turn the
> AX5043s on and check current tomorrow.
>
> Tomorrow I will solder the three memory chips I took off which are not
> shorted back on power up to be sure things are still working.
>
> Next, I will solder a TMS570 I have on hand and check power and function.
> If the board still functions I should be able to talk to the TMS570 via
> JTAG and load a program into flash.
>
> While waiting for the chips from Zach I built up an interface cable to
> connect the 10 pin JATAG to the 20 pin DSC100 connector with the correct
> pins wired together. This took me about 3
> hours because the wires are so small and working out the details. Due to
> this I laid out a PCB to support using two off-the-shelf ribbon cables from
> Mouser. I will post the connection info to the GitHub.
> I will also order enough ribbon cables to support the four board sets but
> need to verify what is needed for each programmer people will be using.
>
>
>
> I have about 20 of these on order at JLCPCB which should be in my hands in
> about a week +- holidays.
>
> The board is layer out so one can cut and rejumper if there is an error or
> another connection is need for a different programmer.
>
> *Looking to the future…*
>
> The boot loader and all initial code will have to run from FLASH. I have
> not looked at the current memory map to see if this is the case now. Jim if
> your blinky program will run from flash you can send it along.
>
> Need to review the memory test program and hopefully it also runs from
> flash. I will want to test the three of four memory chips to see if they
> are working and not damaged from voltage or soldering and removing and
> desoldering. I will need to purchase one more MR25H40CDE memory chip to
> have a full set again. These chips are in the $28 dollar range from mouser
> so I hope the three are working. I am assuming I will be able to solder
> them back on the board. I believe I can but I want be reflowing the solder
> on the pad initially. If they get hot in use I may try to do this later
> with hot air system.
>
> This is all a typical bring-up process for a board this complex. It looks
> like if we put replacement voltage regulators on the other boards and tune
> the logic on the watch dog or replace the current control devices ($5 each)
> which would be easy to do the other three boards should come up working.
>
> i have also ordered 12 more of the voltage regulators from China which I
> hope will be working and equivalent. Should have those in a week also.
>
> Lots more to test and checkout but if the TMS570 will work it should go
> faster.
>
> Bob N5BRG
>
>
>
>
> -----------------------------------------------------------
>
> pacsat-dev mailing list -- pacsat-dev(a)amsat.org
> View archives of this mailing list at
> https://mailman.amsat.org/hyperkitty/list/[email protected]
> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org
> Manage all of your AMSAT-NA mailing list preferences at
> https://mailman.amsat.org
>
--
Chris E. Thompson
chrisethompson(a)gmail.com
g0kla(a)arrl.net
Here is an update on my progress checking out the QuadRxOneTx board.….
I got the power supply working properly with the chips Zack sent. Took some time to repair the things I did to debug the issue and get the small parts soldered on the board.
When i powered up both supplies were working properly. I did add clamping Zener diodes across the outputs to provide some modest protection.
Then I had to reinsert the programming resistors on the current limiting MAX4995 which I removed to isolate sections of the board.
When I started testing one of the 3.3V supply sections was not powering up and the supplies were dropping out in a constant pattern. Found the issue was the Watch Dog was
not dibbled and this was turning things off and back on in time. Disabled these. I also found I have the control logic which turns the power on and off reversed. This is another case of
picking the correct logic on the watch dog chip by using the proper suffix. The one I specified is AL which I assume is Active Low and I needed active high. I disowned this and hard wire them
all to be on for now. Will need to work on this more later. The watchdog chip can also be configured in different ways so all this needs to be worked when CPU is working.
With all the board functional (minus the TMS570) still had a short on one 3.3v section. After some investigation I determine the short was in one or more memory chip. The
data sheet for these indicated they are particularly sensitive. So I removed all four of them. After removal and some component testing I found only one of the four was
Actually shorted. However with these off the board the power supplies were all functioning properly throughout the board.
One troubling thing i noticed was with the short on the 3.3V supply if you jumped by the current limiter which I did to find the issue and removed the jumper that supply would jump up to about 3.8 volts and take a bunch of seconds to settle back down to 3.3V. This is a issue with a DC to DC regulator which is plus width modulated and adjusting to hold the output at a fixed level. Typically we will not have a short but if a temporary short were to happen in space the supply could over react and zap some other parts. Could put the clamping zener on for space use if we can find a good voltage to use but then these could become a failure point.
None of the other chips on the board seem to have issues from over voltage now that the supplies are up and working but will need to test individually to be sure. The AX5043 have never been turned on yet.
At this point with no CPU and no memory and the AX5043 all turned off the board is pulling about 25Ma of current. I should also manually turn the AX5043s on and check current tomorrow.
Tomorrow I will solder the three memory chips I took off which are not shorted back on power up to be sure things are still working.
Next, I will solder a TMS570 I have on hand and check power and function. If the board still functions I should be able to talk to the TMS570 via JTAG and load a program into flash.
While waiting for the chips from Zach I built up an interface cable to connect the 10 pin JATAG to the 20 pin DSC100 connector with the correct pins wired together. This took me about 3
hours because the wires are so small and working out the details. Due to this I laid out a PCB to support using two off-the-shelf ribbon cables from Mouser. I will post the connection info to the GitHub.
I will also order enough ribbon cables to support the four board sets but need to verify what is needed for each programmer people will be using.
[cid:[email protected]]
I have about 20 of these on order at JLCPCB which should be in my hands in about a week +- holidays.
The board is layer out so one can cut and rejumper if there is an error or another connection is need for a different programmer.
Looking to the future…
The boot loader and all initial code will have to run from FLASH. I have not looked at the current memory map to see if this is the case now. Jim if your blinky program will run from flash you can send it along.
Need to review the memory test program and hopefully it also runs from flash. I will want to test the three of four memory chips to see if they are working and not damaged from voltage or soldering and removing and desoldering. I will need to purchase one more MR25H40CDE memory chip to have a full set again. These chips are in the $28 dollar range from mouser so I hope the three are working. I am assuming I will be able to solder them back on the board. I believe I can but I want be reflowing the solder on the pad initially. If they get hot in use I may try to do this later with hot air system.
This is all a typical bring-up process for a board this complex. It looks like if we put replacement voltage regulators on the other boards and tune the logic on the watch dog or replace the current control devices ($5 each) which would be easy to do the other three boards should come up working.
i have also ordered 12 more of the voltage regulators from China which I hope will be working and equivalent. Should have those in a week also.
Lots more to test and checkout but if the TMS570 will work it should go faster.
Bob N5BRG
I won't be able to make this Thursday's meeting as I will be at a concert.
73
Chris
On Wed, Dec 13, 2023 at 5:36 PM Burns Fisher (AMSAT) via pacsat-dev <
pacsat-dev(a)amsat.org> wrote:
> My Thursday with another meeting. FWIW, I just ordered 10 TMS570 debug
> boards and the Samtec connectors (FTSH-105-01-L-D-K) that the RTIHU uses.
> I've still not quite figured out what is on Bob's board, but I'm not
> planning to replace more than one of the connectors.
>
> 73,
>
> Burns Fisher, WB1FJ
> *AMSAT(R) Engineering -- Flight Software*
>
>
> On Wed, Dec 13, 2023 at 5:33 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org>
> wrote:
>
>> Pacsat dev mtg
>> Thu, Dec 14, 2023 7:00 PM - 9:00 PM (CST)
>>
>> Please join my meeting from your computer, tablet or smartphone.
>>
>> https://meet.goto.com/856856893
>>
>> You can also dial in using your phone.
>> (For supported devices, tap a one-touch number below to join instantly.)
>>
>> United States: +1 (872) 240-3212
>> - One-touch: tel:+18722403212,,856856893#
>>
>> Access Code: 856-856-893
>>
>> Join from a video-conferencing room or system.
>> Dial in or type: 67.217.95.2 or inroomlink.goto.com
>> Meeting ID: 856 856 893
>> Or dial directly: 856856893(a)67.217.95.2 or 67.217.95.2##856856893
>>
>>
>> Get the app now and be ready when your first meeting starts:
>> https://meet.goto.com/install
>>
>>
>>
>> -----------------------------------------------------------
>>
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>>
>
> -----------------------------------------------------------
>
> pacsat-dev mailing list -- pacsat-dev(a)amsat.org
> View archives of this mailing list at
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>
--
Chris E. Thompson
chrisethompson(a)gmail.com
g0kla(a)arrl.net
My Thursday with another meeting. FWIW, I just ordered 10 TMS570 debug
boards and the Samtec connectors (FTSH-105-01-L-D-K) that the RTIHU uses.
I've still not quite figured out what is on Bob's board, but I'm not
planning to replace more than one of the connectors.
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Wed, Dec 13, 2023 at 5:33 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org>
wrote:
> Pacsat dev mtg
> Thu, Dec 14, 2023 7:00 PM - 9:00 PM (CST)
>
> Please join my meeting from your computer, tablet or smartphone.
>
> https://meet.goto.com/856856893
>
> You can also dial in using your phone.
> (For supported devices, tap a one-touch number below to join instantly.)
>
> United States: +1 (872) 240-3212
> - One-touch: tel:+18722403212,,856856893#
>
> Access Code: 856-856-893
>
> Join from a video-conferencing room or system.
> Dial in or type: 67.217.95.2 or inroomlink.goto.com
> Meeting ID: 856 856 893
> Or dial directly: 856856893(a)67.217.95.2 or 67.217.95.2##856856893
>
>
> Get the app now and be ready when your first meeting starts:
> https://meet.goto.com/install
>
>
>
> -----------------------------------------------------------
>
> pacsat-dev mailing list -- pacsat-dev(a)amsat.org
> View archives of this mailing list at
> https://mailman.amsat.org/hyperkitty/list/[email protected]
> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org
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> https://mailman.amsat.org
>
Pacsat dev mtg
Thu, Dec 14, 2023 7:00 PM - 9:00 PM (CST)
Please join my meeting from your computer, tablet or smartphone.
https://meet.goto.com/856856893
You can also dial in using your phone.
(For supported devices, tap a one-touch number below to join instantly.)
United States: +1 (872) 240-3212
- One-touch: tel:+18722403212,,856856893#
Access Code: 856-856-893
Join from a video-conferencing room or system.
Dial in or type: 67.217.95.2 or inroomlink.goto.com
Meeting ID: 856 856 893
Or dial directly: 856856893(a)67.217.95.2 or 67.217.95.2##856856893
Get the app now and be ready when your first meeting starts:
https://meet.goto.com/install
Well, I got a shipping notice and a tracking number. The tracking number
does not yet register with UPS though. I continue to say "we'll see".
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Fri, Dec 8, 2023 at 11:58 AM Jim McCullers via pacsat-dev <
pacsat-dev(a)amsat.org> wrote:
> The last thing I ordered from Newark was also shipped from the UK with no
> shipping communications and as I recall took a long time.
>
> It was also an obsolete component by DigiKey and Mouser.
>
>
>
> Keep us posted.
>
>
>
> Jim
>
>
>
> Ok, Bob. The picture sure looks like there are "holes" there, but you
> never know. I do think that I asked Zach to put the connector on the
> bottom so it would line the ribbon cable up correctly with the RTIHU
> connector. We'll find out. BTW, Newark says they are sending the board
> from the UK. Hmm.
>
> 73,
>
>
>
> Burns Fisher, WB1FJ
>
> *AMSAT**(R) **Engineering -- Flight Software*
>
>
>
>
>
> On Fri, Dec 8, 2023 at 11:00 AM Bob Stricklin via pacsat-dev <
> pacsat-dev(a)amsat.org> wrote:
>
> Burns,
>
>
>
> I believe he is talking about a 10 pin connector on the bottom left corner
> of the photo that is turned down below the board.
>
> He probably did this to make a standard ribbon cable work with female IDC
> connectors on each end.
>
>
>
> We can make that change if the boards are shipped.
>
>
>
> It may be that Newark inventory is there because they do not got so much
> business on TI product. Normally when an OEM drops a product they pull all
> the distributor inventory back. These may be a third party board which is
> fine if they have the same processor and code.
>
>
>
> It will be interesting to see if the TI ARM processor TM4C1294NCPDTT3R is
> on these boards. If it is and several people working on AMSAT projects need
> these boards we probably should buy more.
>
>
>
> The info I have is the design information I showed last night that Zach
> shared with me on an AMSAT version of this programming interface board.
>
>
>
> Bob
>
>
>
>
>
>
>
> On Dec 8, 2023, at 9:41 AM, Burns Fisher (AMSAT) via pacsat-dev <
> pacsat-dev(a)amsat.org> wrote:
>
>
>
> Thanks, Zach. That might mean that what I ordered is different. See in
> the picture, the place where you added the connector is not populated.
> (You have to hover over it to get the expanded version in order to see it).
>
>
>
>
> https://www.newark.com/texas-instruments/cc-devpack-debug/debugger-devpak-s…
>
>
>
> Well see what happens. Actually do you have a couple of male connectors
> that you could send me? That way, I could easily add it in and test the
> new board (assuming it comes...maybe you'd better wait until I get a
> shipping number :-) )
>
>
> 73,
>
>
>
> Burns Fisher, WB1FJ
>
> *AMSAT**(R) **Engineering -- Flight Software*
>
>
>
>
>
> On Fri, Dec 8, 2023 at 10:32 AM Zach Metzinger <zmetzing(a)pobox.com> wrote:
>
> On 12/8/23 08:07, Burns Fisher (AMSAT) wrote:
> > Note to Pacsat folks: It appears (and Zach can confirm) that Zach must
> > have just ADDED a connector into a DNP space on the board...this is
> > based on the pictures.
>
> Hello Burns and the Pacsat team,
>
> This is not correct; I replace the female 2x5 connector with a male 2x5
> shrouded/keyed connector. Instructions, already sent to Bob Strickland,
> attached.
>
> 73,
>
> --- Zach
> N0ZGO
>
>
> -----------------------------------------------------------
>
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> https://mailman.amsat.org
>
>
>
>
> -----------------------------------------------------------
>
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> https://mailman.amsat.org
>
>
> -----------------------------------------------------------
>
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I must have sent this only to Bob.
AFAIK this chip only appears in the RT-IHU V1.1. Eric did not build the
RT-IHU so probably not. Zach might. However, he apparently knew it was
obsolete so V1.2 has a different but incompatible chip.
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Mon, Dec 11, 2023 at 1:27 PM Jim McCullers via pacsat-dev <
pacsat-dev(a)amsat.org> wrote:
> Bummer
>
> In most cases a suffix indicates a minor difference.
>
> Getting more difficult to deal with older components and variations.
> Try getting a 2N3177, used in almost every linear power supply since the
> 70s.
> No longer manufactured and stocks are limited with the expected increase in
> price.
> I have several Astron power supplies donated to our local club that need
> refreshing.
> At the moment the best source appears to be Astron, who apparently bought a
> large stock.
>
> Burns, would Eric or Zach have the MAX1556A inventory?
>
> Jim
> WA4CWI
>
>
> After looking into this more I see the MAX1556A was specified in the
> schematic and BOM. The MAX1556 was placed on the board. These two parts
> work
> differently WRT to the programming pins D1, D2.
> If the MAX1556A had been used we would have been fine.
>
> I see no stock not his part at Mouser or Digikey or Newark, or anyone in
> the
> US so far. I do see inventory in ASIA. If they will sell a small quantity
> of
> say 16 we should be able to swap out the parts. Shipping cost will be $40
> to
> $60.
>
> This part is now Obsolete at Analog Devices.
>
> I think these part was used on earlier AMSAT boards. I would like to know
> if
> there is any inventory available before ordering the parts from Asia? We
> need a minimum of 8 but I would like to have 16 to be sure we get them
> soldered on the boards.
>
> Bob
>
>
> -----------------------------------------------------------
>
> pacsat-dev mailing list -- pacsat-dev(a)amsat.org View archives of this
> mailing list at
> https://mailman.amsat.org/hyperkitty/list/[email protected]
> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org Manage all of
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>
>
> -----------------------------------------------------------
>
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>
Bummer
In most cases a suffix indicates a minor difference.
Getting more difficult to deal with older components and variations.
Try getting a 2N3177, used in almost every linear power supply since the
70s.
No longer manufactured and stocks are limited with the expected increase in
price.
I have several Astron power supplies donated to our local club that need
refreshing.
At the moment the best source appears to be Astron, who apparently bought a
large stock.
Burns, would Eric or Zach have the MAX1556A inventory?
Jim
WA4CWI
After looking into this more I see the MAX1556A was specified in the
schematic and BOM. The MAX1556 was placed on the board. These two parts work
differently WRT to the programming pins D1, D2.
If the MAX1556A had been used we would have been fine.
I see no stock not his part at Mouser or Digikey or Newark, or anyone in the
US so far. I do see inventory in ASIA. If they will sell a small quantity of
say 16 we should be able to swap out the parts. Shipping cost will be $40 to
$60.
This part is now Obsolete at Analog Devices.
I think these part was used on earlier AMSAT boards. I would like to know if
there is any inventory available before ordering the parts from Asia? We
need a minimum of 8 but I would like to have 16 to be sure we get them
soldered on the boards.
Bob
-----------------------------------------------------------
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UPS tells me that the package from Newark will arrive tomorrow. Zach,
perhaps it is now safe to send me two of those connectors for the debug
board.
Thanks!
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
