Using STM32CubeMX to make a DFU bootloader, I want to light a LED whenever USB packets are exchanged, to indicate that a DFU binary is being transferred.
...but I can't find the right callback to place my HAL_GPIO_WritePin. What is the callback to use?
I'm finding methods like EP0_TxSent and USBD_LL_DataInStage, but I'm not finding a simple interrupt or callback to indicate 'a USB data packet was sent or received.'
I want to implement that interrupt and blink my GPIO connected LED inside it.
