On Wed, Jul 6, 2011 at 9:25 AM, c-aries <babyaries2@xxxxxxxxx> wrote:
> Hi all.
> When I read the pl2303 driver source code in linux-2.6.36, I am confuse
> about these codes:
>
> $ cat -n pl2303.c
> ...
> 125 #define VENDOR_WRITE_REQUEST_TYPE 0x40
> 126 #define VENDOR_WRITE_REQUEST 0x01
> 127
> 128 #define VENDOR_READ_REQUEST_TYPE 0xc0
> 129 #define VENDOR_READ_REQUEST 0x01
> ...
> 179 static int pl2303_startup(struct usb_serial *serial)
> 180 {
> ...
> 210 pl2303_vendor_read(0x8484, 0, serial, buf);
> 211 pl2303_vendor_write(0x0404, 0, serial);
> ...
> 236 }
> ...
> $
>
> I download the pl2303 datasheet, but can't find anything related to
> vendor specific read, write methods. So I can't figure out what does
> 0x8484 and 0x0404 mean.
>
> Could you tell me where can I find the pl2303 vendor read write methods'
> reference?
You may have to go through reverse engineering if the vendor does not
provide the documents. You can use a USB sniffer to sniff the
communication under Windows.
Some references:
http://libusb.6.n5.nabble.com/Converting-Win32-code-to-libusb-tp4536601p4537332.html
--
Xiaofan
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