How to send a zero length packet

li_sw — Mon, 03 Sep 2018 13:48:47 GMT

I design a HID USB device with the LPC2468. According to the USB specification，when processing the Setup transfer, a zero length packet should be sended to the host at the status stage .I want to know the flow about sending the zero length packet

Thanks

Re: How to send a zero length packet

CarlosCasillas — Tue, 04 Sep 2018 22:10:13 GMT

Hi Li,

If you are starting a new USB-based application, it is recommended considering a newer LPC device, because LPC2xxx are now legacy devices.

Regarding zero-length packet, it may depend of the used USB stack; you could take a look at the following links for reference:

https://github.com/micromint/LPCOpen-keil-lpc43xx/blob/master/applications/lpc18xx_43xx/examples/usbd_rom/usbd_rom_libusb/libusbdev.h

http://www.keil.com/forum/16271/arm7-lpc2148-amp-usb-communication/

https://www.nxp.com/docs/en/application-note/AN10703.pdf

Hope this will be useful for you.
Best regards!
/Carlos
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Re: How to send a zero length packet

li_sw — Mon, 10 Sep 2018 12:25:20 GMT

Hi, Carlos,

Thank you very much.My problem has been solved.

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How to send a zero length packet

Re: How to send a zero length packet

Re: How to send a zero length packet