Figure 397. Receive Fifo Packet Read - ST STM32F413 Reference Manual

RM0430
SETUP transactions
This section describes how the core handles SETUP packets and the application's
sequence for handling SETUP transactions.
•
Application requirements
1. To receive a SETUP packet, the STUPCNT field (OTG_DOEPTSIZx) in a control OUT
endpoint must be programmed to a non-zero value. When the application programs the
STUPCNT field to a non-zero value, the core receives SETUP packets and writes them
to the receive FIFO, irrespective of the NAK status and EPENA bit setting in
OTG_DOEPCTLx. The STUPCNT field is decremented every time the control endpoint
receives a SETUP packet. If the STUPCNT field is not programmed to a proper value
before receiving a SETUP packet, the core still receives the SETUP packet and

Figure 397. Receive FIFO packet read

DocID029473 Rev 3
USB on-the-go full-speed (OTG_FS)
1221/1284
1245