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Old 10-21-2011, 02:10 PM   #1
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Registered: Oct 2011
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PXA320's udc is inactive

Hello friends,

I have a problem making udc work on our PXA320-based board.

The board is similar to Marvell Zylonite.
Here is the info of our board:
CPU - PXA320
RAM - 128MB
NAND - 128MB
Kernel - linux-2.6.32

What I'm trying to do is to enable the UDC (USB Device Controller) and connect our board to PC via g_ether.

I have confirmed that the hardware is OK by loading Windows CE on it and connected to PC via activesync.

In linux, I enabled UDC and g_ether on menuconfig. g_ether is built as a Kernel Module. RNDIS is also included in the build.

After I flushed the image to my board and launched the OS, pxa_ude_probe was called and everything was fine.

Then I run "ifup usb0" and "usb_gadget_register_driver" was called by g_ether. The D+ pull-up resistor was enabled and I measured the D+ pin and found 3.3 volts there.

However if I plug in my usb cable, PC detects the USB device and sends GET DEVICE DESCRIPTOR but there is nothing sent from USB device.

I dumped some register values in usb_gadget_register_driver function and found that UDCCR is 0x1 which means that UDC is enabled but is inactive.

The following are the register values I dumped:
+++ usb_gadget_register_driver
UDCCR(0x0) = 0x1
UDCICR0(0x4) = 0x3
UDCICR1(0x8) = 0xb8000000
UDCISR0(0xc) = 0x0
UDCISR1(0x10) = 0x0
UDCFNR(0x14) = 0x0
UDCOTGICR(0x18) = 0x0
UP2OCR(0x20) = 0xa0
UP3OCR(0x24) = 0x0
(0x100) = 0x200
(0x200) = 0x0
(0x300) = 0x63c81c5c
(0x400) = 0x0
ICPR = 0x0
ICPR2 = 0x0
ICIP = 0x0
ICIP2 = 0x0
ICFP = 0x0
ICFP2 = 0x0
ICMR = 0x6b24c08
ICMR2 = 0x2000
ICLR = 0x0
ICLR2 = 0x0
ICCR = 0x1
ACCR = 0x321f
ACSR = 0x3003321f
AICSR = 0x0
CKEN_A = 0xffbfffff
CKEN_B = 0xffffffff
--- usb_gadget_register_driver

From the register values I can see that UDC clock is enabled, UDC interrupt is enabled, and UDC registers are set properly.

I have no idea why UDC is inactive. Can anyone point out how to solve this problem?

Thanks in advance,


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