How to detect sleep/resume events from the host of USB HID.

[FKopp.1]

Hi,

I'm using my stm32 as a USB HID device and I would like to be able to detect when the host computer goes into sleep mode and when it resumes. How would I detect this change?

I tried checking the following continuously in the main loop but detected no change:

if(((USBD_HandleTypeDef*)hpcd_USB_FS.pData)->dev_state==USBD_STATE_SUSPENDED){

Am I missing something or is there a better way?

[waclawek.jan]

JW

[FKopp.1]

This seems to be talking about OTG devices, but I'm just a regular FS usb device

[FKopp.1]

.

[waclawek.jan]

You did not care to tell us which STM32 are you using, and my crystal cube told me the wrong one. So one more guess:

 

JW

[FKopp.1]

Thanks for the reply, The device is an stm32L151C8T6A

I'm doing the following check continuously in the main loop

if(USB_ISTR & USB_ISTR_SUSP){

The bit seems always to be 1. Is there something else I need to enable to make this work?