<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
</head>
<body dir="ltr">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif;" dir="ltr">
<p><span style="font-size: 12pt;">Hi </span><span style="font-size: 13.3333px;">Christian Mauderer,</span><br>
</p>
<p><span style="font-size: 13.3333px;">Ok, i got your idea,I will try it.</span></p>
<p><span style="font-size: 13.3333px;">Thank you for your patient for my problem.</span></p>
<p><span style="font-size: 13.3333px;"><br>
</span></p>
<p><span style="font-size: 13.3333px;">Best regards</span></p>
<p><span style="font-size: 13.3333px;">Sichen Zhao</span></p>
<p></p>
<br>
<br>
<div style="color: rgb(0, 0, 0);">
<div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Christian Mauderer <christian.mauderer@embedded-brains.de><br>
<b>Sent:</b> Wednesday, April 19, 2017 11:05 PM<br>
<b>To:</b> 赵 思晨<br>
<b>Cc:</b> RTEMS<br>
<b>Subject:</b> Re: GSOC 2017 RTEMS-libbsd issue</font>
<div> </div>
</div>
</div>
<font size="2"><span style="font-size:10pt;">
<div class="PlainText"><br>
<br>
----- Ursprüngliche Mail -----<br>
> Von: "赵 思晨" <zsc19940506@outlook.com><br>
> An: "Christian Mauderer" <christian.mauderer@embedded-brains.de>, "RTEMS" <devel@rtems.org><br>
> Gesendet: Mittwoch, 19. April 2017 16:41:20<br>
> Betreff: Re: GSOC 2017 RTEMS-libbsd issue<br>
<br>
> Hi Christian Mauderer,<br>
> <br>
> 1. I haven't put these change in my git repo yet.<br>
> <br>
> 2.Yes, i verified that by the console output , the below snapshot :<br>
> <br>
> <br>
> including some debug info. just forget it.<br>
> <br>
> <br>
> [cid:4fb54908-2ff4-4098-9f94-6f2aa529babf]<br>
> <br>
> <br>
> 3.The application i use is testsuite/usb01, i debug it, and it loop at the<br>
> uhub_explore function in usb_hub.c, and didn't reach the umass_probe function.<br>
> <br>
> <br>
> 4. I noticed that the pin USB1_DRVVBUS and USBx_VBUSIN is always low, so i think<br>
> it can't detect the new device.<br>
> <br>
> <br>
> Best Regards<br>
> <br>
> Sichen Zhao<br>
> <br>
> <br>
<br>
Hello Sichen Zhao,<br>
<br>
point 4 sounds like you found your problem. According to the schematics, there is a TPS2051 on the BBB to switch the power of the USB. This chip has an active high enable input. So USB1_DRVVBUS should be high.<br>
<br>
For a quick try, you could connect a self powered hub. But sooner or later, you should just switch the pin on. Please note that it might would be a good idea to use it to reset the connected devices on a reboot.<br>
<br>
Kind regards<br>
<br>
Christian<br>
<br>
-- <br>
--------------------------------------------<br>
embedded brains GmbH<br>
Christian Mauderer<br>
Dornierstr. 4<br>
D-82178 Puchheim<br>
Germany<br>
email: christian.mauderer@embedded-brains.de<br>
Phone: +49-89-18 94 741 - 18<br>
Fax: +49-89-18 94 741 - 08<br>
PGP: Public key available on request.<br>
<br>
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.<br>
</div>
</span></font></div>
</div>
</body>
</html>