Posted on August 15, 2017 at 12:27Hi
I have a USB barcode reader that acts as HID keyboard. When I plug it in to a Windows 10 machine it identified as 'USB keyboard device' (under device Manager - keyboards) and works fine: if I open text file and scan codes - they are typed in to the text file as if I used a regular keyboard to type it in.
I have the STM32f4x9I-EVAL evaluation board and I built and run the USB_Host\HID_OS project for USBH-FS.
It is taken from
STM32Cube_FW_F4_V1.16.0
and I'm using it as it is without any configuration or code changes.
When I connect a Logitech USB keyboard to the eval board it works fine: show parameters and then shows the typed in keys on the display.
When I connect the barcode device, it seems to start working fine - it displays information communicated with it - Manufacturer, Product, Serial Number, etc... as can be seen in the attached picture, and identified as keyboard.
However, it right away disconnects (I verified the barcode reader is powered on)
When I dig into the drivers, it seems that the point of failure is in the USBH_Process (in USBH_core.c) under 'case HOST_CLASS_REQUEST:
The following call
status = phost->pActiveClass->Requests(phost);
returns status == USBH_BUSY endlessly until the device is disconnected.
When I examine the behavior of the same location with the working Logitech keyboard, is also repeatedly returns
USBH_BUSY but at some point it returns USBH_OK status and the state machine moves to HOST_CLASS state
Can I do any configuration changes (to the USB?) to make it work? is there any timeout somewhere I can increase?
Any idea of how to move on from here and what to debug/test in order to analyze this issue will be appreciated.
Thanks.
