Critical code snippet for example:dev_hid_generic_lite_bm

uzslm — Tue, 28 Jan 2025 17:41:50 GMT

Dear,

I installed SDK for LPC5516 and imported the example of "dev_hid_generic_lite_bm" into my MCUXpresso IDE;after reading some documents, I learned that if the host send anything to it,it will send same the thing back to the host PC,but i failed to locate the right code snippet of loop-back;

Could you kindly advise where can i find the right code for this? i would like to take it as a starting point.

there have been quite a few files i can not get myself familiar with,such as:

usb_device_dci.c

usb_device_lpcip3511.c

........................................................

where can i get documents explaining for usage of those files?

Thank you very much!

uzslm

Re: Critical code snippet for example:dev_hid_generic_lite_bm

Harry_Zhang — Fri, 07 Feb 2025 03:32:34 GMT

Hi @uzslm

This loop back is implemented through interrupts.

You can check this code.

void USB0_IRQHandler(void) { USB_DeviceLpcIp3511IsrFunction(g_UsbDeviceHidGeneric.deviceHandle); }

usb_device_dci.c is the Device Controller Interface file that abstracts hardware operations for the USB driver.

usb_device_lpcip3511.c
This file implements the LPC USB IP3511 controller driver (low-level communication between MCU and USB hardware).

Harry

topic Critical code snippet for example:dev_hid_generic_lite_bm in LPC Microcontrollers

Critical code snippet for example:dev_hid_generic_lite_bm

Re: Critical code snippet for example:dev_hid_generic_lite_bm