NAKSTS=B_0x0, MPSIZ=B_0x0
OTG device control OUT endpoint 0 control register
| MPSIZ | Maximum packet size The maximum packet size for control OUT endpoint 0 is the same as what is programmed in control IN endpoint 0. 0 (B_0x0): 64 bytes 1 (B_0x1): 32 bytes 2 (B_0x2): 16 bytes 3 (B_0x3): 8 bytes |
| USBAEP | USB active endpoint This bit is always set to 1, indicating that a control endpoint 0 is always active in all configurations and interfaces. |
| NAKSTS | NAK status Indicates the following: When either the application or the core sets this bit, the core stops receiving data, even if there is space in the Rx FIFO to accommodate the incoming packet. Irrespective of this bits setting, the core always responds to SETUP data packets with an ACK handshake. 0 (B_0x0): The core is transmitting non-NAK handshakes based on the FIFO status. 1 (B_0x1): The core is transmitting NAK handshakes on this endpoint. |
| EPTYP | Endpoint type Hardcoded to 00 for control. |
| SNPM | Snoop mode This bit configures the endpoint to Snoop mode. In Snoop mode, the core does not check the correctness of OUT packets before transferring them to application memory. |
| STALL | STALL handshake The application can only set this bit, and the core clears it, when a SETUP token is received for this endpoint. If a NAK bit or Global OUT NAK is set along with this bit, the STALL bit takes priority. Irrespective of this bits setting, the core always responds to SETUP data packets with an ACK handshake. |
| CNAK | Clear NAK A write to this bit clears the NAK bit for the endpoint. |
| SNAK | Set NAK A write to this bit sets the NAK bit for the endpoint. Using this bit, the application can control the transmission of NAK handshakes on an endpoint. The core can also set this bit on a transfer completed interrupt, or after a SETUP is received on the endpoint. |
| EPDIS | Endpoint disable The application cannot disable control OUT endpoint 0. |
| EPENA | Endpoint enable The application sets this bit to start transmitting data on endpoint 0. The core clears this bit before setting any of the following interrupts on this endpoint: SETUP phase done Endpoint disabled Transfer completed |