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From: Meindert Sprang on 30 Nov 2005 01:55
"trungnl" <ngolamtrung(a)yahoo.com> wrote in message
news:z7SdnaMGFbQ4sRDeRVn-rw(a)giganews.com...
>
> >You have to poll the PL2303 for that.
>
> Thanks Meindert,
>
> I have implemented a polling mechanism to get data from PL2303 to the
> embedded host. But there is another problem
>
> According to PL2303's spec, the chip has an 256-byte-buffer for each Tx
> and Rx operation. But when I transfer a large amount of data (about 3KB)
> to the RS232 interface of PL2303, the USB host can only read a few bytes
> from the USB interface. It seems that the data in PL2303's buffer has lost
> so I cannot read all the data transfered to RS232 interface.

Without knowing all the details, I'd say: poll more often. You have to at
least poll often enough not to let your 256 buffer fill up.

Meindert


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