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Hrm, I thought the ti/lm4f cdc-acm demo code did this, but it
might have it locally. The definitions from the standard would be
certainly welcome in cdc.h
Cheers,
Karl P
Matthew Lai <m...@matthewlai.ca> wrote:
> Upon further research, I found that there is an optional "Set
> Control Line State" request that does exactly what I want. It
> is not yet implemented in cdc.h.
>
> I am going to implement it myself unless someone has done it
> already?
>
> Thanks
> Matthew
>
> On 2015-11-08 11:31 PM, Matthew Lai wrote:
> > Hello!
> >
> > I am using CDC ACM as a debug logging interface, so sometimes there is a
> > USB cable connected, and sometimes there isn't.
> >
> > My send routine looks like this -
> >
> > int ret = 0;
> >
> > do
> > {
> > ret = usbd_ep_write_packet(usbd_dev, 0x82, data, size);
> > }
> > while (ret == 0);
> >
> > However, if I call this function when either the USB cable isn't plugged
> > in or serial monitor is not opened on the computer, usbd_ep_write_packet
> > will just keep returning 0.
> >
> > Is there a way around this? Is there a way to tell whether the function
> > returned zero because there is no receiver, or if it returned zero
> > because it's busy and we should retry? Detecting whether the cable is
> > plugged in (or even whether the device is enumerated) is insufficient.
> >
> > Thanks!
> > Matthew
> >
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