Trying to use USB HOST (CDC type) on STM32F746ZG failed receiving data

[Ofer]

Hi

I'm trying to read the output from BARCODE reader (ES4650) using USB-HOST using CDC type.

On connecting the USB cable I'm getting SOF interrupts (although I disable the Signal SOF on CUBE). On pointing the barcode reader to a barcode I'm getting some USB interrupt causes (USB_OTG_GINTSTS_RXFLVL and USB_OTG_GINTSTS_HCINT - both for IN and OUT).

On getting those interrupts I'm looking in the USB data buffer and see no data.

The CDC Class is as follow:

USBH_ClassTypeDef CDC_Class =

{

 "CDC",

 USB_CDC_CLASS,

 USBH_CDC_InterfaceInit,

 USBH_CDC_InterfaceDeInit,

 USBH_CDC_ClassRequest,

 USBH_CDC_Process,

 USBH_CDC_SOFProcess,

 NULL,

};

The code never reach those functions.

I was accepting using other drivers functions as USBH_CDC_Receive or USBH_CDC_ReceiveCallback but as you can see, the CUBE defines others.

What do I do wrong ?

Thanks

[waclawek.jan]

Maybe the device is not CDC ACM compliant. Check the descriptors it sends (maybe when connected to PC, e.g. using lsusb if you are using Linux).

JW

[Ofer]

Hi JW

The device support both USB-HOST virtual com-port and USB-HOST HID (keyboard).

I tested the HID mode and it works like a charm, so I don't have to test the CDC anymore - thanks anyway.

Ofer