azure-rtos/usbx/blob/082fd9db09a3669eca3358f10b8837a5c1635c0b/common/usbx_host_classes/src/ux_host_class_pima_read.c#L182) will copy the data length and send it to the kernel. In a similar way, if device response length is greater than header_length, the data length would be copied and sent to the kernel. This is how the data length is being sent from device to host and vice versa. The best way to resolve this issue is to ensure that the length of the data being sent over USB is always equal to the length of the data being received over USB. For example, if the data length in the host request is 10 bytes and the data length in the device response is 5 bytes, then the data length in the data being sent over USB would always be 5 bytes. This is the easiest way to ensure that data length alignment is maintained.
You can verify USB device response payload alignment by using HCS and FCS
The easiest way to verify that your USB device response is aligned properly is to use HCS and FCS.
To resolve this issue, the host will check the HCS, which is sent by the device in response to a host request, for an error code. If an error code is found in the HCS, then it means that the device did not send any data back and you should take remedial action.
If no error code was found in the HCS, then the host will proceed with sending a FCS. The FCS contains all of the data that was received from the device in response to a host request. The host routine that checks for payload alignment uses these two values - data length and header_length - as inputs. If both are less than 0x80000000 (which indicates that ALIGNMENT has been achieved), then everything is fine and there's nothing more to do. Otherwise, you need to revert or fix your application or firmware so it does not cause this issue.
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Published on: 10/13/2022 19:15:00 UTC
Last modified on: 10/18/2022 20:30:00 UTC