Re: Selection of a USB microcontroller
- From: "FD" <fd@xxxxxxxxxx>
- Date: Fri, 27 Apr 2007 12:43:48 +0200
"Ulf Samuelsson" <ulf@xxxxxxxxxxxxx> schreef in bericht
news:f0r6kh$ge0$1@xxxxxxxxxxx
3. Specifically, if you choose the COM port emulation (usbser.sys),
you'll be dogged with always wondering what the COM port is when you plug
it in. I hate that problem. Love to know if there's a solution.
A well behaved CDC uses a serial number and you allocate
a new port for every new serial number you detect.
This is not so good in a school environment where
you can have a large qty of USB devices and you will eventually
have a COM port allocated for each such device.
--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB
I am a newbie on the USB front and the host side driver is something that I
overlooked a bit. I definitely need Windows and Linux support.
A USB to serial convertor (in my design) might be a very simple solution.
It is not too hard to find the COM port where the device is connected to:
- scan the first 20 ports for availability (open the device)
- provide a handshake method between application and device
- for multiple devices: serial number the device with handshaking
I already use this with the serial devices I developed, since I implemented
a serial communications protocol.
Frank
.
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