topic Re: LPC546xx - USB transfer stalled in LPC Microcontrollers

LPC546xx - USB transfer stalled

hamatron — Fri, 26 Jul 2019 01:11:38 GMT

I have a problem with TransferStall on USB_HostHubInterruptInCallback ( usb_host_hub_app.c ) .

This happens when the device is connected to the host and will not advance beyond USB_HostHubProcessPortAttach's kPortRunWaitPortResetDone.

In the case of Hid, it seems to be cleared as follows.

usb_host_hid.c

if (status == kStatus_USB_TransferStall)

{

if (USB_HostHidClearHalt(hidInstance, transfer, USB_HostHidClearInHaltCallback,

(USB_REQUEST_TYPE_DIR_IN |

((usb_host_pipe_t *)hidInstance->inPipe)->endpointAddress)) == kStatus_USB_Success)

{

USB_HostFreeTransfer(hidInstance->hostHandle, transfer);

return;

}

Why stall occur and How do I clear stall states?

Thanks for your reply

Regards

Re: LPC546xx - USB transfer stalled

Sabina_Bruce — Mon, 29 Jul 2019 15:22:32 GMT

Hi Shuntaro,

I'll be more than happy assisting you with this behavior. However, in order to provide better support, can you please confirm the version of SDK you are using and the name of the example.

Thank you,

Sabina

Re: LPC546xx - USB transfer stalled

hamatron — Tue, 30 Jul 2019 03:18:56 GMT

Hi Sabina,

Thanks for your replying and apologize for lack of infomation.

SDK : SDK_2.x_LPC54606J256 version 2.5.0

example : host_hid_generic_bm

Thank you.

Shuntaro

Re: LPC546xx - USB transfer stalled

Sabina_Bruce — Tue, 30 Jul 2019 17:00:28 GMT

Hi Shuntaro,

Thank you for the information. First considering that the stall packet indicates that the endpoint has halted, or a control pipe does not support a certain request. Essentially it is unable to transmit or receive data. I tried the example with different devices and effectively got stuck on a stall when the device was not supported. In the example it self it is configured to accept only two id's.

First I'd like to check your device descriptors that you are using, as well as any relevant information that is printed on the terminal. This will help to find the root cause of the stall, since it is not best to clear the stall anytime it happens. The stall should only be cleared if the device is supported.

Best Regards,

Sabina