GigaDevice Semiconductor GD32VF103 User Manual page 521

1:0 MPL[1:0]
Device IN endpoint-x control register (USBFS_DIEPxCTL) (x = 1..3, where x =
endpoint_number)
Address offset: 0x0900 + (endpoint_number × 0x20)
Reset value: 0x0000 0000
This register has to be accessed by word (32-bit)
31 30 29
rs rs w
15 14 13
rw
Bits Fields
31 EPEN
30 EPD
29 SODDFRM
SD1PID
Maximum packet length
This field defines the maximum packet length for a control data packet. As described
in USB 2.0 protocol, there are 4 kinds of length for control transfers:
00: 64 bytes
01: 32 bytes
10: 16 bytes
11: 8 bytes
28 27 26 25
w w w
12 11 10 9
Descriptions
Endpoint enable
Set by the application and cleared by USBFS.
0: Endpoint disabled
1: Endpoint enabled
Software should follow the operation guide to disable or enable an endpoint.
Endpoint disable
Software can set this bit to disable the endpoint. Software should following the
operation guide to disable or enable an endpoint.
Set odd frame (For isochronous IN endpoints)
This bit has effect only if this is an isochronous IN endpoint.
Software sets this bit to set EOFRM bit in this register.
Set DATA1 PID (For interrupt/bulk IN endpoints)
Software sets this bit to set DPID bit in this register.
GD32VF103 User Manual
24 23 22 21
rw rw/rs
8 7 6 5
rw
20 19 18 17
rw r
4 3 2 1
16
r
0
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