Etching Brds - USB Prob - Solution Found

Posted on July 26, 2012 at 07:15

STM32 Manuals and Schematics CORRECTION - USB Pinout Backwards

In Manufacturing my own Boards, and with the assistance of Tsuneo,

I have found that the SPECS specify the USB PINOUT Backwards.

This is afterI analyzed the Specs and Schems

- which match my Eagle Pcb Files and my Boards.

And, I tested this from Cable-end to Micro-Pins with a MultiMeter.

The UsbVBus+ and UsbGND are Correct,

but the UsbDm and UsbDp are specified BACKWARDS

in both Stm32F4_Ref Manual and the Discovery Board Schems.

No, you can not just flip the cable - Only TWO of the PINS are Backwards.

PINOUT CORRECTION below :

  p1=UsbVBUS -> PA9

  p2=UsbDM     -> res=20R ->  PA12  (not PA11)

  p3=UsbDP      -> res=20R ->  PA11  (not PA12)

  p4=UsbID       -> PA10

  p5=UsbGND   -> GND

-> Take HEED of this NOTE CORRECTION before making Boards !

------------------------------------------------------------------

Tsuneo,

You are kidding me.  I see the results as you say.  So the schematics are backwards ?

Yes, I use USB-View, besides a Usb packet logger analyzer.

Let me check the Usb connections.

I forgot about this simple issue.  For example, just Google for USB PLUG PINOUT IMAGE , then click the images page.  Notice that the Plug on the Right is labeled Gnd D- D+ V+ , which should be Gnd D+ D- V+.  This error has been on there for years like this - and is still there. 

Bingo ! - That fixes it.

So, looking at the Stm32f4Discovery and Stm3240g and Stm32405_RefMan. 

And scanned over my Eagle Pcb Files which match the Schems and Spec.

-- It seems that they have the Pinouts backwards !

I followed these Pinouts - but they are backwards - CORRECTION below :

p1=UsbVBUS -> PA9

p2=UsbDM     -> res=20R ->  PA12  (not PA11)

p3=UsbDP      -> res=20R ->  PA11  (not PA12)

p4=UsbID       -> PA10

p5=UsbGND   -> GND

Sounds ridiculous that this Error went through the Manuals and specs,

- but I have seen it before.

Explains why I have not seen and I can not find Schems and DIY Projects for the STM32 with USB.

Tsuneo, thanks - for the unique and constructive idea and solution.

--------------------------------------------------------------------------------

From: chinzei.tsuneo

Connection from the D+/D- pins of the USB receptacle to the MCU USB DP/DM pins may be swapped.

 ConnectionStatus: DeviceFailedEnumeration

 Device Bus Speed:      Low   <----------

If the stm32f4 (Unknown device) is detected as low-speed, the D+/D- connections are swapped.

 

Posted on July 26, 2012 at 11:53

So for the Nonsense Posting members - seems that following To-The-Spec is Wrong.

 

Post your Nonsense somewhere else ...

 

Just stop asking nonsense questions.

Posted on July 26, 2012 at 13:44

Whats left for me to list ?

Just look in the Manuals yourself that I listed: Stm32f4Discovery_Board_Manual Schem at end, and Stm32f405_Ref_Man fig 343 on page 934.  The Pinouts do not function hooked up this way - DM and DP need be reversed PA12 and PA11.

I tested this from cable end to Micro Pins to UsbDM and UsbDP pins are specified backwards.

Posted on July 26, 2012 at 15:22

It is working for me :) PA.11 D- PA.12 D+

See attachment for SCH.

________________

Attachments :

BB.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HtUM&d=%2Fa%2F0X0000000aQj%2FuNfQQfpm6rl6vsIs0CCsZf.vm2Ov4_lF4ua3LB3WsL0&asPdf=false

Posted on July 26, 2012 at 16:44

It is working for me :) PA.11 D- PA.12 D+

Here too, and the ST-LINK USB connector is demonstrably connected PA11 DM, PA12 DP of the STM32F103's on several different discovery designs and matches the schematic. I haven't drunk enough Kool-Aid this morning to go pull uDFN packages off the board.

Everyone needs to do their own due diligence, but I'm not buying into this conspiracy nonsense.

Posted on July 26, 2012 at 20:19

I did exactly what you supposed me to do and looked into the manuals (DM00039084 & DM00031020 and the datasheet DM00037051), but I was not able to reconstruct your problem. I can't see any error there.

When I read the following sentence from [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/STM32 Manuals and Schematics CORRECTION - USB Pinout Backwards&currentviews=49]your first post in this thread:

<cite>

I forgot about this simple issue.  For example, just Google for USB PLUG PINOUT IMAGE , then click the images page.  Notice that the Plug on the Right is labeled Gnd D- D+ V+ , which should be Gnd D+ D- V+.  This error has been on there for years like this - and is still there.

</cite>

I guess that you switched the pinout of your connector according to one of the several wrong images like, e.g.

http://www.google.de/imgres?imgurl=http://wiki.bemaniso.ws/w/images/e/e9/USB_A_pinout.jpg&imgrefurl=http://wiki.bemaniso.ws/wiki/How_to_make_parallel_adapters&h=145&w=205&sz=9&tbnid=7dep87ZBSKq7zM:&tbnh=93&tbnw=132&prev=/search?q%3DUSB%2BPLUG%2BPINOUT%2BIMAGE%26tbm%3Disch%26tbo%3Du&zoom=1&q=USB+PLUG+PINOUT+IMAGE&usg=__L7a6hjObFHnWTITJT2_x0cCftlI=&docid=BgWv1IMT7sfFBM&sa=X&ei=cYMRUPXyMojbsgb2rYD4AQ&ved=0CGMQ9QEwAg&dur=587

, instead of using a more trustful source as for example

http://en.wikipedia.org/wiki/Universal_Serial_Bus#USB_standard_connectors

or

http://www.usb.org/developers/docs/usb_20_071012.zip

.

Because of this I asked for a screenshot of your schematic.

Posted on July 26, 2012 at 21:54

What conspiracy - Bugs just happen ...

Maybe it is backwards on the Board.

I was refering to a later Design File v1065 , while the Printed File is v945.

I think that I had swapped the pins after they were printed in design.

Usb is on the Bottom of the Board and I probably got them backwards.

Thanks for the help - for the members who did the research.