USB stall error

[Viljami]

Hello again Giovanni!

Hi,

Is it possible your descriptor is wrong somehow? it happens after the host retrieves it.

Giovanni

Do you mean especially (USB) device descriptor or configuration one or what?

BR

Viljami

[Giovanni]

The one sent by USB_REQ_GET_DESCRIPTOR but you should check anything is exchanged before the stall.

Giovanni

[Viljami]

Hello again Giovanni!

I checked, debugged etc. my code.

USB_REQ_GET_DESCRIPTOR requests USB_DESCRIPTOR_DEVICE_QUALIFIER; I added handling for that.

The following is from default_handler (hal_usb.c):

Code: Select all

  .
  .
  case (uint32_t)USB_RTYPE_RECIPIENT_DEVICE | ((uint32_t)USB_REQ_GET_DESCRIPTOR << 8):
  case (uint32_t)USB_RTYPE_RECIPIENT_INTERFACE | ((uint32_t)USB_REQ_GET_DESCRIPTOR << 8):
    /* Handling descriptor requests from the host.*/
    dp = usbp->config->get_descriptor_cb(usbp, usbp->setup[3],
                                         usbp->setup[2],
                                         get_hword(&usbp->setup[4]));
    if (dp == NULL) {
      return false;
    }
    /*lint -save -e9005 [11.8] Removing const is fine.*/
    usbSetupTransfer(usbp, (uint8_t *)dp->ud_string, dp->ud_size, NULL);
    /*lint -restore*/
    return true;
    .
    .


After adding of USB_DESCRIPTOR_DEVICE_QUALIFIER the program running here returns true but still USB stalls.

There is no any handling for USB_DESCRIPTOR_DEVICE_QUALIFIER in my earlier ChibiOS code. It's possible that I have to go through my USB descriptors.

BR

Viljami