Figure 349. Isochronous Out Transactions - ST STM32F412 Reference Manual

USB on-the-go full-speed (OTG_FS)
1
init_reg(ch_2)
1
2
set_ch_en
(ch_2)
2
6
6
read_rx_sts
read_rx_fifo
read_rx_sts
7
init_reg(ch_2)
9
set_ch_en
(ch_2)
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)
1090/1163

Figure 349. Isochronous OUT transactions

Application AHB
init_reg(ch_1)
write_tx_fifo
(ch_1)
MPS
init_reg(ch_1)
write_tx_fifo
(ch_1)
MPS
MPS
init_reg(ch_1)
write_tx_fifo
(ch_1)
MPS
RM0402 Rev 6
Host
3
1
ch_1
ch_2
3
5
1
5 5
1
ch_1
8 8
ch 2 ch_2
1
USB
Periodic Request
Queue
Assume that this queue
can hold 4 entries.
4
4 4
RM0402
Device
Odd
(micro)
frame
Even
(micro)
frame
MSv36022V1