The usb can not init OK, and error in USB_DevInit.

[jimmy_cheng]

USB_FlushTxFifoc & USB_FlushRxFifo API flag USB_OTG_GRSTCTL_TXFFLSH & USB_OTG_GRSTCTL_RXFFLSH can not clear when set.

[FBL]

Hi @jimmy_cheng 

Typically, you have an issue to initialize your USB PHY consequently core init. Check you clock configuration, your sequence to configure the PHY. 

[jimmy_cheng]

Hi, @FBL 

I use the USB3340-EZK and checked the clock configuration is correct，and the USB_CoreInit API can return HAL_OK.

It's run OK last week, but get the HAL_TIMEOUT in "Flush TX /RX Fifo " this week. I have no change.

The local variables below when break stop on 469 line.

numuint32_t0x10

USBxUSB_OTG_GlobalTypeDef *0x40040000

GOTGCTL volatile uint32_t 0x30100c0

GOTGINT volatile uint32_t 0x100000

GAHBCFG volatile uint32_t 0x0

GUSBCFG volatile uint32_t 0x40001410

GRSTCTL volatile uint32_t 0x80000000

GINTSTS volatile uint32_t 0x14000020

GINTMSK volatile uint32_t 0x0

GRXSTSR volatile uint32_t 0x0

GRXSTSP volatile uint32_t 0x0

GRXFSIZ volatile uint32_t 0x400

DIEPTXF0_HNPTXFSIZ volatile uint32_t 0x4000400

HNPTXSTS volatile uint32_t 0x80400

Reserved30 uint32_t [2] 0x40040030

GCCFG volatile uint32_t 0x0

CID volatile uint32_t 0x2300

GSNPSID volatile uint32_t 0x4f54330a

GHWCFG1 volatile uint32_t 0x0

GHWCFG2 volatile uint32_t 0x229fe190

GHWCFG3 volatile uint32_t 0x3b8d2e8

Reserved6 uint32_t 0xe3f00030

GLPMCFG volatile uint32_t 0x0

GPWRDN volatile uint32_t 0xc200010

GDFIFOCFG volatile uint32_t 0x3b80400

GADPCTL volatile uint32_t 0x0

Reserved43 uint32_t [39] 0x40040064

HPTXFSIZ volatile uint32_t 0x0

DIEPTXF volatile uint32_t [15] 0x40040104

countvolatile uint32_t0x0

[FBL]

Hi @jimmy_cheng 

I have seen a similar issue on F4, could you confirm inserting __DSB(); resolves the issue to ensure transaction is complete.

[jimmy_cheng]

Hi, @FBL 

I inserted the __DSB(), but can not solve my issue. But still get the HAL_TIMEOUT return.