ST STM32L4x6 Reference Manual page 1605

RM0351
1. Initialize and enable channel 1. The application must set the ODDFRM bit in
OTG_HCCHAR1.
2. Write the first packet for channel 1.
3. Along with the last Word write of each packet, the OTG_FS host writes an entry to the
periodic request queue.
4. The OTG_FS host attempts to send an OUT token in the next (odd) frame.
5. The OTG_FS host generates an XFRC interrupt as soon as the last packet is
transmitted successfully.
6. In response to the XFRC interrupt, reinitialize the channel for the next transfer.
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USB on-the-go full-speed (OTG_FS)
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