Environment:
STM32F401RC
USB HID device, Full speed
freeRTOS
Problem:
Device can send/receive data to/from host and can be put in suspend state and resume from suspend state.
However, the remote wake-up function never works
Code:
My USB remote wake up log in a freeRTOS task:
// hUsbDeviceFS is a global USBD_HandleTypeDef
PCD_HandleTypeDef *hpcd = (PCD_HandleTypeDef *)hUsbDeviceFS.pData;
HAL_PCD_ActivateRemoteWakeup(hpcd);
osDelayUntil(&last_wake_time, 5);
HAL_PCD_DeActivateRemoteWakeup(hpcd);
Observation:
USB D+ keeps at logic '1' and USB D- keeps at logic '0' when suspend. Never observed 'K' state on the USB data wire and therefore cannot wake up host.
Question:
Did I miss anything? Is there any example that I can take a look?
Thank you very much!
