C6A8168 USB

Hi,

I am not a Liunx guy and can not say much about what the Image does. There is a Linux forum if you want to go through that route. However, I can tell you what is expected from USB operation perspective.

The mode that the USB is operating depends upon the state of the USB ID pin. On the 8168 device it is controlled by s/w. Make sure the iddig field is programmed with the right value. After proper initialization and you set the SESSION bit, the controller will assume the role of a Host and will drive the USBDRVVBUS high to enable the external power supply to source 5V power.

While doing this you will be getting a USBDRVVBUS interrupt (if enabled) because it changed state.

That said, check the content of POWER and DEVCTL register and let us know. Also consult the TRM to identify the right register (I think it is USBx_MODE) and field to configure the state of the USB ID pin.

Best regards, Zegeye

Hi,

I checked the IDDIG value. USB0_MODE register is 0x0; DEVCTL register is 0x80.

My CPU serial number is X8168X3894BCYG (18ADEZC).If ROMCODE change will effect USB?

Best regards,

Tong

Hi,

OK. Please try the followings.

Set bit 7 of USB0_MODE register and then after set DEVCTL[bit0=SESSION].

DEVCTL[bit7-bDevice] = 1/0 => Device/Host role assumption only when DEVCTL{SESSION] is set to 1.

Let me know the outcome after performing this.

Best regards, Zegeye

Hi,

I try to do,It's OK. Pin DRVVBUS output high. But  bit 7 of USB0_MODE register is reserved. The CPU Version change ? I Access USB device,kernel print:

root@MyPBX:~#cat /proc/driver/musb_hdrc.0

Status: HDRC, Mode=Host (Power=e0, DevCtl=19)

OTG state: a_wait_bcon; inactive

Options: ?dma?, host, debug=0 [eps=16]

Root port status: 00000100

CPPI: txcr=0 txsrc=0 txena=0; rxcr=0 rxsrc=280de80 rxena=0 

root@MyPBX:~# usb 1-1: new high speed USB device using musb-hdrc and address 6

usb 1-1: device descriptor read/all, error -71

usb 1-1: new high speed USB device using musb-hdrc and address 7

usb 1-1: device descriptor read/all, error -71

usb 1-1: new high speed USB device using musb-hdrc and address 8

usb 1-1: device descriptor read/8, error -71

usb 1-1: device descriptor read/8, error -71

usb 1-1: new high speed USB device using musb-hdrc and address 9

usb 1-1: device descriptor read/8, error -71

usb 1-1: device descriptor read/8, error -71

hub 1-0:1.0: unable to enumerate USB device on port 1

root@MyPBX:~# cat /proc/driver/musb_hdrc.0

Status: HDRC, Mode=Host (Power=f0, DevCtl=5d)

OTG state: a_host; active

Options: ?dma?, host, debug=0 [eps=16]

Root port status: 00000501

CPPI: txcr=0 txsrc=0 txena=0; rxcr=0 rxsrc=280de80 rxena=0

Best regards

Tong

Hi,

I consulted TI FAE.He asked question at Linux Forum.http://e2e.ti.com/support/embedded/f/354/p/136619/491338.aspx#491338.

Now Problem has been solved.

Thanks Zegeye!

Best regards,

Tong