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USB cdc baud rate changing

 
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GreenPic



Joined: 02 May 2006
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USB cdc baud rate changing
PostPosted: Fri May 12, 2006 2:50 am     Reply with quote
How can I change baud rate in USB CDC Virtual Com port Example?
Even if i change baud rate in 'usb_cdc_init()' and i set different baud rate in HyperTerminal it steel works so changing has no effect.
Ttelmah
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PostPosted: Fri May 12, 2006 7:12 am     Reply with quote
It is a virtual com port, not a real one. The same happens wth virtual ports over ethernet. The communication rate over USB, remains the same whatever you set, and the device at the other end, receiving the data over USB, always gets the data. If however the 'virtual' port is then mapped at the device to a 'real' port, you have to make provision to hand the 'rate' data over to the device, and change speed on the real port to match the selection. This involves adding this to the Windows driver, and to the data passed over the USB connection.

Best Wishes
GreenPic



Joined: 02 May 2006
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PostPosted: Fri May 12, 2006 8:26 am     Reply with quote
Ttelmah wrote:
It is a virtual com port, not a real one. The same happens wth virtual ports over ethernet. The communication rate over USB, remains the same whatever you set, and the device at the other end, receiving the data over USB, always gets the data. If however the 'virtual' port is then mapped at the device to a 'real' port, you have to make provision to hand the 'rate' data over to the device, and change speed on the real port to match the selection. This involves adding this to the Windows driver, and to the data passed over the USB connection.

Best Wishes


So, what bit rate i have? Not 9600 (like is in usb_cdc()) ???
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