topic Re: IMXRT USB full-speed example? in i.MX Processors

IMXRT USB full-speed example?

jackking — Sat, 12 Jan 2019 21:42:12 GMT

I am working on a design that uses a USB isolator chip (ADuM4160) which does not support hi-speed USB.

I would like to use the KHCI configuration for USB, but it seems that only the EHCI included files are configured properly for the IMXRT UsbType. The KHCI includes are packaged in the latest MCUXpresso SDK.

Are there some examples for the IMXRT that use USB full-speed instead of hi-speed, or an easy way to convert them?

Thanks

Re: IMXRT USB full-speed example?

igorpadykov — Mon, 14 Jan 2019 05:08:32 GMT

Hi Jack

for configuring USB as only full-speed one can set bit 24 PFSC register PORTSC1 described in
sect.41.7.31 Port Status & Control (USB_nPORTSC1) i.MX RT1050 Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMXRT1050RM.pdf

Best regards
igor
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Re: IMXRT USB full-speed example?

Eric_bj_Kang — Mon, 19 Oct 2020 09:08:29 GMT

Hi Igor,
Thanks for your response.

I confirmed the operation to change the speed from High to Full.
For this, I just set the PFSC bit as "1".

For Detailed, refer to the below contents.

> Test Board : i.MXRT1050-EVK
> Test Project : evkbimxrt1050_dev_msc_sdcard_lite_bm
> Modified Register :
- USB_nPORTSC1 register / PFSC bit
- 0, High-Speed (default) / 1, Full-Speed
> Test Result, for High-/Full-Speed
-

> Modified Source / Contents
- source/disk_sdcard.c

int main(void)
{
...
USB_DeviceApplicationInit();

// check USB1->PORTSC1 value
usb_echo("USB_PORTSC1(0x402E0184) / PSPD, bit.27-26 = 0x%0X \r\n", (uint32_t)(USB1->PORTSC1)); // 0x1C00.0004

// force USB Port, as Full-Speed - Eric
USB1->PORTSC1 |= USB_PORTSC1_PFSC(1); // 0 - High-Speed(default) / 1 - Full-Speed
usb_echo("USB_PORTSC1(0x402E0184) / PSPD, bit.27-26 = 0x%0X \r\n", (uint32_t)(USB1->PORTSC1)); // 0x1D00.0004

while (1)
...
}

Best Regards,
Eric.

Re: IMXRT USB full-speed example?

pedro_guilherme — Thu, 18 Feb 2021 20:35:14 GMT

This solution worked for me on i.MX RT 1020. Thanks!

Before:

After:

Re: IMXRT USB full-speed example?

nico_santana — Thu, 20 Feb 2025 23:18:58 GMT

This worked for me in the RW612!

thanks a lot