Hi, I have a STM32F401CBU6 custom board configured as USB host and connected to APC UPS HID device. My custom board is identical to the Disco411 kit.

When connected and detached the APC UPS device, my STM32 code is able to trigger the HOST_DEV_ATTACHED and HOST_DEV_DISCONNECTED events.

After HOST_DEV_ATTACHED and HOST_ENUMERATION events, In HOST_CHECK_CLASS, I have added code to sent a character to APC UPS from STM32 USB host using

status=USBH_HID_SetReport(phost,0x02,0x00,'Y',1);

The status is always coming as USBH_BUSY.

What could be the reason?? Any ideas or pointers will help me.

Regards,

Pradeep

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