imx27 - USB Over Current

imx_user — Mon, 24 Nov 2014 07:08:35 GMT

Has anyone tested the USB over current function of iMX27?

I configure "USB_OC_B" to act as USB Host 1 over current detection pin, but when I trigger this pin, both Host 1 and Host 2 over current interrupts come in.

The USB Configuration Register settings is:

USB_CTRL(600h)=0x59494030.

When I simulated over current on "USB_OC_B" pin, the following debug messages comes in:

GetPortStatus host 2 = 0x80001831, USBSTS=0xC48C, SysIntr=23

GetPortStatus host 1 = 0xE0501831, USBSTS=0xC08C, SysIntr=24

Anyone can advise me? Thanks in advance.

Re: imx27 - USB Over Current

art — Tue, 25 Nov 2014 08:54:40 GMT

The USB_OC_B signal operates as the common overcurrent signal for both USB Host and OTG (in Host mode) cores of i.MX27, so, the behaviour you observe is the normal one. If you want to dedicate this signal for a single core (e.g. USB Host core only), just disable the overcurrent interrupt for another one.

Have a great day,
Artur

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imx27 - USB Over Current

Re: imx27 - USB Over Current