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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