STMicroelectronics STM32F405 Reference Manual page 1395

RM0090
Bit 9 HNPRQ: HNP request
The application sets this bit to initiate an HNP request to the connected USB host. The
application can clear this bit by writing a 0 when the host negotiation success status change
bit in the OTG interrupt register (HNSSCHG bit in OTG_HS_GOTGINT) is set. The core
clears this bit when the HNSSCHG bit is cleared.
0: No HNP request
1: HNP request
Note: Only accessible in peripheral mode.
Bit 8 HNGSCS: Host negotiation success
The core sets this bit when host negotiation is successful. The core clears this bit when the
HNP Request (HNPRQ) bit in this register is set.
0: Host negotiation failure
1: Host negotiation success
Note: Only accessible in peripheral mode.
Bits 7:2 Reserved, must be kept at reset value.
Bit 1 SRQ: Session request
The application sets this bit to initiate a session request on the USB. The application can
clear this bit by writing a 0 when the host negotiation success status change bit in the OTG
Interrupt register (HNSSCHG bit in OTG_HS_GOTGINT) is set. The core clears this bit when
the HNSSCHG bit is cleared.
If you use the USB 1.1 full-speed serial transceiver interface to initiate the session request,
the application must wait until V
register (BSVLD bit in OTG_HS_GOTGCTL) is cleared. This discharge time varies between
different PHYs and can be obtained from the PHY vendor.
0: No session request
1: Session request
Note: Only accessible in peripheral mode.
Bit 0 SRQSCS: Session request success
The core sets this bit when a session request initiation is successful.
0: Session request failure
1: Session request success
Note: Only accessible in peripheral mode.
OTG_HS interrupt register (OTG_HS_GOTGINT)
Address offset: 0x04
Reset value: 0x0000 0000
The application reads this register whenever there is an OTG interrupt and clears the bits in
this register to clear the OTG interrupt.
31 30 29 28 27 26 25 24 23 22 21 20 19
Reserved
discharges to 0.2 V, after the B-Session Valid bit in this
BUS
18 17 16 15 14 13 12 11 10
Reserved
rc_ rc_ rc_
w1 w1 w1
DocID018909 Rev 11
USB on-the-go high-speed (OTG_HS)
9 8 7 6 5
Reserved
rc_ rc_
w1 w1
4 3 2 1 0
Res.
rc_
w1
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