i.MX6 USB host detection

rspolyak — Wed, 20 Mar 2019 14:23:58 GMT

According to "i.MX 6SoloLite Applications Processor Reference Manual, Rev. 3, 09/2017" it is possible to detect when i.MX6 is connected to USB host. I am referring to section "52.2.4.5 USB Plugged-In Detector" and "52.2.7.2 Data pin contact detector.

On my i.MX6 I have enabled "Data pin contact detector" mode in register USB_ANALOG_USB1_CHRG_DETECTn by setting:

EN_B = 0

CHK_CHRG_B = 1

CHK_CONTACT = 1

But I do not observe any difference while my board is plugged to power bank or USB host. USB_ANALOG_USB1_CHRG_DETECT_STAT value is the same for both cases. Moreover, when connected to PC only PLUG_CONTACT bit is set to 1, but I would expect that DP_STATE and DM_STATE are also set.

Please see log below when i.MX6 is connected either to PC or power bank:

root@imx6:~# ./app 0x20C81B0 <-- USB1_CHRG_DETECT register.
:0x020c81b0 =0x000c0000 <-- EN_B = 0, CHK_CHRG_B = 1, CHK_CONTACT = 1

root@imx6:~# ./app 0x20C81D0 <-- USB1_CHRG_DETECT_STAT register
:0x020c81d0 =0x00000001 <-- DP_STATE = 0, DM_STATE = 0, CHRG_DETECTED = 0, PLUG_CONTACT = 1

Re: i.MX6 USB host detection

igorpadykov — Thu, 21 Mar 2019 09:13:45 GMT

Hi Ros

for usb charger detection examples one can look at linux drivers on

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

https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/usb/gadget/imx_usb_charger.c?h=imx_3.0.35_4.1.0_caf

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

topic i.MX6 USB host detection in i.MX Processors

i.MX6 USB host detection

Re: i.MX6 USB host detection