Figure 401. Normal Isochronous Out/In Transactions - ST STM32F405 Reference Manual

USB on-the-go full-speed (OTG_FS)
init_reg(ch _2)
set_ch_en
read_rx_sts
read_rx_fifo
read_rx_sts
init_reg(ch _2)
set_ch_en
•
Interrupt service routine for isochronous OUT/IN transactions
Code sample: Isochronous OUT
Unmask (FRMOR/XFRC)
if (XFRC)
{
De-allocate Channel
}
else
if (FRMOR)
{
Unmask CHH
Disable Channel
}
1350/1749

Figure 401. Normal isochronous OUT/IN transactions

Application
1
init _reg(ch_1)
1
write_tx_fifo
(ch_1)
2
(ch_2)
2
6
init _reg(ch_1)
write_tx_fifo
(ch_1)
6
7
9
(ch_2)
init _reg(ch_1)
write_tx_fifo
(ch_1)
AHB Host
3
1
MPS
3
5
5
1
MPS
RXFLVL interrupt
1
MPS
RXFLVL interrupt
8
1
MPS
RM0090 Rev 18
USB
Periodic Request Queue
Assume that this queue
can hold 4 entries.
4
ch_1
ch_2
4
ch_1
ch_2
RM0090
Device
Odd
(micro)
frame
Even
(micro)
frame
ai15676