USB on-the-go full-speed (OTG_FS) RM0008
860/1096 Doc ID 13902 Rev 12
OTG_FS Host channel-x interrupt register (OTG_FS_HCINTx) (x = 0..7, where
x = Channel_number)
Address offset: 0x508 + (Channel_number × 0x20)
Reset value: 0x0000 0000
This register indicates the status of a channel with respect to USB- and AHB-related events.
It is shown in Figure 309. The application must read this register when the host channels
interrupt bit in the Core interrupt register (HCINT bit in OTG_FS_GINTSTS) is set. Before
the application can read this register, it must first read the host all channels interrupt
(OTG_FS_HAINT) register to get the exact channel number for the host channel-x interrupt
register. The application must clear the appropriate bit in this register to clear the
corresponding bits in the OTG_FS_HAINT and OTG_FS_GINTSTS registers.
Bit 15 EPDIR: Endpoint direction
Indicates whether the transaction is IN or OUT.
0: OUT
1: IN
Bits 14:11 EPNUM: Endpoint number
Indicates the endpoint number on the device serving as the data source or sink.
Bits 10:0 MPSIZ: Maximum packet size
Indicates the maximum packet size of the associated endpoint.
313029282726252423222120191817161514131211109876543210
Reserved
DTERR
FRMOR
BBERR
TXERR
Reserved
ACK
NAK
STALL
Reserved
CHH
XFRC
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Bits 31:11 Reserved
Bit 10 DTERR: Data toggle error
Bit 9 FRMOR: Frame overrun
Bit 8 BBERR: Babble error
Bit 7 TXERR: Transaction error
Indicates one of the following errors occurred on the USB.
CRC check failure
Timeout
Bit stuff error
False EOP
Bit 6 Reserved
Bit 5 ACK: ACK response received/transmitted interrupt
Bit 4 NAK: NAK response received interrupt
Bit 3 STALL: STALL response received interrupt
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