Figure 421. Normal Interrupt Out/In Transactions - Slave Mode - STMicroelectronics STM32F405 Reference Manual

USB on-the-go high-speed (OTG_HS)
•
Interrupt service routine for interrupt OUT/IN transactions
a)
Unmask (NAK/TXERR/STALL/XFRC/FRMOR)
if (XFRC)
{
Reset Error Count
Mask ACK
De-allocate Channel
}
else
if (STALL or FRMOR)
{
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Figure 421. Normal interrupt OUT/IN transactions - Slave mode

Interrupt OUT
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