ST STM32F412

USB on-the-go full-speed (OTG_FS) RM0402
1090/1163 RM0402 Rev 6
Figure 349. Isochronous OUT transactions
1. The grayed elements are not relevant in the context of this figure.
• Interrupt service routine for isochronous OUT/IN transactions
Code sample: isochronous OUT
Unmask (FRMOR/XFRC)
if (XFRC)
MSv36022V1
HostApplication AHB
write_tx_fifo
(ch_1)
init_reg(ch_1)
write_tx_fifo
(ch_1)
c
h_2
X
f
e
r
C
o
m
p
l
i
n
t
e
r
r
u
p
t
Periodic Request
Queue
Assume that this queue
can hold 4 entries.
1
5
5
2
3
4
6
3
init_reg(ch_1)
write_tx_fifo
(ch_1)
init_reg(ch_1)
MPS
D
A
T
A
0
5
4
4
Even
(micro)
frame
Odd
(micro)
frame
DeviceUSB
7
9
6
set
_
c
h_
e
n
(
ch_2
)
init_re
g(
ch_2
)
rea
d
_rx_st
s
read_rx_
f
i
fo
rea
d
_rx_st
s
set_c
h
_e
n
(
ch_2
)
init_reg
(
ch_2
)
1
2
RxFLvl interrupt
RxFLvl interrupt
XferCompl interrupt
XferCompl interrupt
OUT
IN
IN
OUT
D
A
T
A
0
M
P
S
D
A
T
A
0
D
A
T
A
0
M
P
S
ch_2
ch 2
ch_1
8
8
ch_1
1
MPS
1
MPS
M
P
S
1
1