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Missing feature in Middleware-Lib CDC ACM

Wolf Waberski

Hello,

i´m working on a K-Line interface using a STM32F105.
The middleware lib is successfully installed and the virtual com port is running good with the CDC ACM feature.

Now there is a special problem. The KWP2000 protocol is using a special RS232 feature called send line break condition.
There is a SEND_BREAK request (23h) send from Windows via the usbser.sys driver to the middleware library. So the cortex as to apply a positiv voltage on the rs-232 tx-line.

I could´t find the point or the function which is called or is it not implemented in the usb device class?

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