Stopping and de-init

[senilix]

Hi,

First, thanks for a great project. However, I have a question. I have a project where I would like to be able to stop and de-init the tinyusb stack and restart later on.

I could of course just hack it and stop calling the tud_task function and de-initialize the hardware. But, it would be nice if one was able to do it without resorting to this. I run the tinyusb stack in a thread and my initial idea was that it would be nice if one could inject a stop-event into the tud_task queue requesting it to stop and perhaps the tud_task function could return a value that indicated the stack was stopped?

Any thoughts?

Thanks

[hathach]

This is thing I plan to do but haven't yet. Meanwhile you could try to call tud_disconnect() and/or adding your specific platform suspend task, turn off usb phy etc ... and do the opposite when calling tud_connect()

[senilix]

Thanks, I will take a look. Can see I use a older version of tinyusb and will upgrade. But, it would be great if there were some structured way of closing down.

[MarekRyn]

After calling tud_disconnect() it is not possible to restart connection with tud_init(). The reason is that global flag _usbd_rhport remains in valid state and function tud_init() returns on lines:

// skip if already initialized
if ( tud_inited() ) return true

The solution is to modify 'tud_disconnect()', as below:

bool tud_disconnect(void)
{
  TU_VERIFY(dcd_disconnect);
  dcd_disconnect(_usbd_rhport);
  _usbd_rhport = RHPORT_INVALID;
  return true;
}

[JeffCalwood]

Isn't the counterpart to tud_disconnect() simply tud_connect()? Adding _usbd_rhport = RHPORT_INVALID; to tud_disconnect() would break this pair of functions. If you want to tud_init() after tud_disconnect(), shouldn't you call tud_deinit()?

[roma-jam]

Hi, full tusb_teardown() implementation could be found in this PR: https://github.com/hathach/tinyusb/pull/2904