LPC43XX USB0 HOST APPL - WHAT CHANGES TO BE MADE?? WHILE USING A BARCODE READER AS HID KEYBOARD.

shivrajtbm — Wed, 25 Aug 2021 05:18:18 GMT

HI,

I HAVE INTERFACED HID KEYBOARD USING LPC43XX USB0 HOST, WHEN USING ACTUAL KEYBOARD HARDWARE IT IS WORKING FINE..

BUT WHEN I CONNECT A BARCODE READER HARDWARE - WHICH CAN BE USED AS HID KEYBAORD (CONFIRMED SAME BY CONNECTING TO A PC) DEVICE GETS SUCCESSFULLY ENUMERATED BUT HARDFAULT OCCURS WHEN I READ A BARCODE.!!!

FOLLOWING IS LIST OF DIFFRENCES I HAVE OBSERVED WHILE DEBUGGING -

PARAMETRS	HID KEYBOARD	BARCODE READER (AS HID KEYBOARD)
SUPPORTS BOOT PROTOCOL	YES	NO
SPEED	LOW SPEED	HIGH SPEED
EXPECTED INTERRUPT EVENT BYTES AT HOST	1 BYTE ON KEYPRESS	MORE THAN 1 BYTE ON SCAN EVERNT (DEPENDING ON BARCODE)
INPUT ENDPOINT POLLING INTERVAL	10 milliSeconds	1 milliSecond
REPORT LENGTH	65	63

ALSO IT HAS BEEN OBSERVED THAT WHILE USING A BARCODE SCANNER AND AFTER READING A BARCODE - IN PIPE CONFIGURATIONS IT IS TAKING MORE TIME , MAY BE IT READS A BYTE TOO BUT THEN HARDFAULT OCCURS !!

CAN I GET SOME INPUTS ?? WHAT PARAMETERS I NEED TO CONSIDER & CHANGE FOR THIS BARCODE DEVICE CONFIGURATION??

Re: LPC43XX USB0 HOST APPL - WHAT CHANGES TO BE MADE?? WHILE USING A BARCODE READER AS HID KEYBOARD.

ZhangJennie — Thu, 02 Sep 2021 02:08:16 GMT

I guess this is the same question as

https://community.nxp.com/t5/LPC-Microcontrollers/lpx43xx-usb0-host-HID-keyboard/m-p/1333195#M46364

If yes, welcome sharing solution here.

Have a nice day,

Jun Zhang

topic Re: LPC43XX USB0 HOST APPL - WHAT CHANGES TO BE MADE?? WHILE USING A BARCODE READER AS HID KEYBOARD. in LPC Microcontrollers

LPC43XX USB0 HOST APPL - WHAT CHANGES TO BE MADE?? WHILE USING A BARCODE READER AS HID KEYBOARD.

Re: LPC43XX USB0 HOST APPL - WHAT CHANGES TO BE MADE?? WHILE USING A BARCODE READER AS HID KEYBOARD.