LPCXpresso54608 USB host

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

LPCXpresso54608 USB host

525 Views
belmontbob59
Contributor IV

Hello, 

I am using 'usb_keyboard2mouse' and I am trying to understand how the full speed host (USB0) is being configured.

The example configures USB0 as a host controller.

 

The specs (Chapter 38.6.1 Pin Description) defines USB0_VBUS as "device only function" . I interpret this as “USB0_VBUS” should not be configured (the table does not even define this as an Output)". So I am confused at the source code in the example. I have the following 2 questions:

 

  1. why is the function pin_mux.c::BOARD_InitPins() configuring USB0_VBUS since it should only be configured when using USB0 in device mode and the program actually configures USB0 as a host controller?
  2. what is the purpose of configuring PIO4_9 (main.c) as GPIO output ? I don’t  find any references to PI04_9 in the dev board manual. The comment refers to VBUS and I am trying to understand how it relates to USB0_VBUS.

Thank you

Labels (1)
0 Kudos
1 Reply

397 Views
jeremyzhou
NXP Employee
NXP Employee

Hi Ben,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1)why is the function pin_mux.c::BOARD_InitPins() configuring USB0_VBUS since it should only be configured when using USB0 in device mode and the program actually configures USB0 as a host controller?
-- Thanks for your reporting, I'll contact to SDK team for checking it.
2) what is the purpose of configuring PIO4_9 (main.c) as GPIO output ? I don’t  find any references to PI04_9 in the dev board manual. The comment refers to VBUS and I am trying to understand how it relates to USB0_VBUS.
-- The PIO4_9 is nothing with the USB0_VBUS pin, you can figure it out when reviewing the SCH of LPCXpresso54608 board.

pastedImage_1.png

Fig 1

Hope it helps.
Have a great day,
TIC

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

0 Kudos