Cool! That demo code does do that.
I am not sure if it is completely compliant however.
It implements SET_LINE_CODING and SET_CONTROL_LINE_STATE, but the
capability bit (0x2) indicates that we support GET_LINE_CODING as well.
The bit indicates support for these 3 requests (and a notification,
which we don't care about).
There is no way to indicate support for only SET_CONTROL_LINE_STATE.
And it seems like the only symbol missing (for implementing this) in
cdc.h is GET_LINE_CODING.
I am not sure if GET_LINE_CODING is actually ever sent by Windows or
Linux, and whether not supporting it (despite setting the capability
bit) would actually be a problem.
Thanks
Matthew
On 2015-11-09 4:41 AM, Karl Palsson wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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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