USB Host i.Mx6S

USB Host i.Mx6S

[andreas.willig]

Hi everyone

did anyone get a USB Stick Mass Storage to run, connected to i.MX6 Solo USB H1? I can get it running on OTG Pure Host, but not on USB H1. It runs into a timeout on issuieng GetDescriptor during usb_rescan. 

Using a scope i don't see any traffic on D+/D-, what i observe is a drop of D- to 1.3V where i expect 3.3V, which i see on Connection to USB OTG (USB stick is a low Speed device, therefore D- High).

Any ideas? Is there an additional Setting for UTMI/USBPhy required?


Mit freundlichen Grüßen aus Berg/ With kind regards

i.A. Andreas Willig
Dipl.-Ing. (FH)
Entwicklung Elektronik

RAFI GmbH & Co. KG
Postfach 2060
88276 Ravensburg
Tel.: +49 (0) 751 89-6142

mailto:andreas.willig@rafi.de, http://www.rafi.de

Kommanditgesellschaft: Sitz Berg, Amtsgericht Ulm, HRA 550059
Komplementär: RAFI Beteiligungs-GmbH, Sitz Berg, Amtsgericht Ulm HRB 550074
Geschäftsführer: Albert Wasmeier, Dipl.-Kfm. Gerhard Schenk
USt-Ident.-Nr.: DE 146 392 319, Steuer-Nr.: 77079/00291

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Antwort: USB Host i.Mx6S

[andreas.willig]

Soon after posting, I found the problem myself :)

USB H1 requires to have VBus fead into controller to power the USBPHY. After adding a 0 Ohm resistor on the right place, the D- semi voltage disappears and enumeration works.

Maybe this is helpfull for someone hitting similar problem (even if hardware is slightly off-Topic here)



Mit freundlichen Grüßen aus Berg/ With kind regards

i.A. Andreas Willig
Dipl.-Ing. (FH)
Entwicklung Elektronik

RAFI GmbH & Co. KG
Postfach 2060
88276 Ravensburg
Tel.: +49 (0) 751 89-6142

mailto:andreas.willig@rafi.de, http://www.rafi.de

Kommanditgesellschaft: Sitz Berg, Amtsgericht Ulm, HRA 550059
Komplementär: RAFI Beteiligungs-GmbH, Sitz Berg, Amtsgericht Ulm HRB 550074
Geschäftsführer: Albert Wasmeier, Dipl.-Kfm. Gerhard Schenk
USt-Ident.-Nr.: DE 146 392 319, Steuer-Nr.: 77079/00291


-----"barebox" <barebox-bounces@lists.infradead.org> schrieb: ----- 
An: Barebox List <barebox@lists.infradead.org>
Von: andreas.willig@rafi.de
Gesendet von: "barebox" 
Datum: 19.06.2015 10:11
Betreff: USB Host i.Mx6S


Hi everyone

did anyone get a USB Stick Mass Storage to run, connected to i.MX6 Solo USB H1? I can get it running on OTG Pure Host, but not on USB H1. It runs into a timeout on issuieng GetDescriptor during usb_rescan. 

Using a scope i don't see any traffic on D+/D-, what i observe is a drop of D- to 1.3V where i expect 3.3V, which i see on Connection to USB OTG (USB stick is a low Speed device, therefore D- High).

Any ideas? Is there an additional Setting for UTMI/USBPhy required?


Mit freundlichen Grüßen aus Berg/ With kind regards

i.A. Andreas Willig
Dipl.-Ing. (FH)
Entwicklung Elektronik

RAFI GmbH & Co. KG
Postfach 2060
88276 Ravensburg
Tel.: +49 (0) 751 89-6142

mailto:andreas.willig@rafi.de, http://www.rafi.de

Kommanditgesellschaft: Sitz Berg, Amtsgericht Ulm, HRA 550059
Komplementär: RAFI Beteiligungs-GmbH, Sitz Berg, Amtsgericht Ulm HRB 550074
Geschäftsführer: Albert Wasmeier, Dipl.-Kfm. Gerhard Schenk
USt-Ident.-Nr.: DE 146 392 319, Steuer-Nr.: 77079/00291

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barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

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