i.MX ProcessorsのトピックRe: USB over-current detection

USB over-current detection

Kazuma_Sasaki — Tue, 18 Feb 2020 07:58:01 GMT

Hi,

In our products, we are using over-current detection to control Vbus supply using USB_H1_PWR pin.

When iMX6DL detect USB over-current event via USB_H1_OC pin, iMX6DL assert a USB_H1_PWR pin soon.

We don't would like to assert USB_H1_PWR signal if the input of the over-current event is less than 1ms.

Is it possible by any register settings change or software change?

SoC : i.MX6DL

OS : Linux BSP 4.1.15_2.0.0_ga

Best Regards,

Kazuma Sasaki.

Re: USB over-current detection

igorpadykov — Tue, 18 Feb 2020 10:19:57 GMT

Hi Kazuma

>Is it possible by any register settings change or software change?

for delay there is no hardware register setting, delay control may be provided via software.

Best regards
igor
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Re: USB over-current detection

Kazuma_Sasaki — Wed, 19 Feb 2020 00:47:18 GMT

Hi Igor,

I appreciate your support.

I am checking usb driver's source code in linux BSP.

But, I could not find controlling code.

Could you please point-out source code asserting USB_H1_PWR signal?

Best Regards,

Kazuma Sasaki.

Re: USB over-current detection

igorpadykov — Wed, 19 Feb 2020 05:59:43 GMT

Hi Kazuma

some third party boards control it in uboot:

cm_fx6.c\cm_fx6\compulab\board - uboot-imx - i.MX U-Boot

One can add additional control for it in usb driver codes

using Linux 4.1.15_2.1.0 BSP & Multimedia Codecs Documentation

and driver sources

chipidea\usb\drivers - linux-imx - i.MX Linux kernel

Best regards
igor

Re: USB over-current detection

Kazuma_Sasaki — Thu, 20 Feb 2020 05:16:35 GMT

Hi Igor,

Thank you so much. I've checked their design. it looks like using GPIO pin instead of USB_H1_PWR pin.
Which register should we control to output USB_H1_PWR signal?

Best Regards,
Kazuma Sasaki.

Re: USB over-current detection

igorpadykov — Thu, 20 Feb 2020 09:53:47 GMT

Hi Kazuma

if gpio is used as USB_H1_PWR signal, it is necessary to use

gpio registers described in Chapter 29 General Purpose Input/Output (GPIO)

i.MX 6Solo/6DualLite Applications Processor Reference Manual

Best regards
igor

Re: USB over-current detection

Kazuma_Sasaki — Thu, 20 Feb 2020 10:30:50 GMT

Hi Igor,

Sorry for the confusion.

From RM:

- We are configuring EIM_D31 pad as USB_H1_PWR function.

- EIM_D31 pad is connecting to enable pad of power IC for cutting VBUS supply.

- When iMX6 detect over-current event, I am expecting EIM_D31 output high signal.

I would like to know the control procedure outputting a high signal from EIM_D31 pad with USB_H1_PWR function.

Best Regards,

Kazuma Sasaki.

Re: USB over-current detection

igorpadykov — Thu, 20 Feb 2020 13:04:26 GMT

Hi Kazuma

since this is new question please create new thread for it.

Original was about software delay and it is answered.

Best regards
igor

Re: USB over-current detection

Kazuma_Sasaki — Thu, 20 Feb 2020 13:10:41 GMT

Hi Igor,

Okay, Thank you for your advice. I created new thread.

https://community.nxp.com/message/1272205

Best Regards,

Kazuma Sasaki.