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Forum: MCU User Forum
Topic: Silabs USB Bulk drvrs updated to handle EP0 data packet after cmd packet.

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Message to Edit: HTML is ON UBB Code is OFF Smilies Legend	Originally posted by Tsuneo on 01-08-2007 08:16 PM <i>"we observed that Vcpp exe freezes only for data with big packet size of e.g. 600 bytes, if data size is 10-12 bytes the exe works fine without any need to open Vcom hyperterminal window, hence to support packets of more than 600 bytes vcom window needs to be open."</i> How do you handle the VCP communication on the host app? I tested my CDC implementation modifying this code, which originally derives from AN197. <a href="http://www.cygnal.org/ubb/Forum9/HTML/000639.html">"Serial xfer problems"</a> posted September 08, 2005 04:30 PM by Tsuneo <a href="http://www.silabs.com/public/documents/tpub_doc/anote/Microcontrollers/Interface/en/AN197.pdf">"AN197: Serial Communications Guide for CP210x"</a> and <a href="http://www.silabs.com/public/documents/software_doc/othersoftware/Microcontrollers/en/AN197SW.zip">AN197SW</a> Using this code, I checked bi-directional transfer speed in various transfer sizes, from some bytes to some megabytes on WinXP SP2. In this test, I didn't notice any failure in the variation of transfer size. What I found is that IN transfer requires ZLP, whenever the transfer size is just the multiple of the max packet size of the bulk IN endpoint. Tsuneo
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