STM32L496 USB error Topic is solved

[lilvinz]

Hi Giovanni,

i am seeing usb errors on STM32L496.
if the error occurs or not depends on the usb host port i am plugging in.
I have not found a pattern yet but this smells like a timing triggered issue.
Maybe it is related to viewtopic.php?t=3439

This is running into an assertion "already transmitting" during setup:
https://github.com/ChibiOS/ChibiOS/blob ... usb.c#L830

Any ideas on how to proceed tracking this down?

Thanks and best regards

Vinz

[lilvinz]

Maybe it is good to know that this chip has the version 0x4F54320AU which means no special handling in ST library's usb driver.

[lilvinz]

Enabling or disabling the L476 workaround doesn't seem to make any difference.

[Giovanni]

That problem was about getting an interrupt in an unexpected state of the driver state machine, this seems to be the same, not sure if it is the same problem.

What version are you using? host?

Giovanni

[lilvinz]

What version are you using? host?

Host: Linux Mint 19
4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

ChibiOS 18.2.1
Compiler: arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 7-2018-q2-update) 7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907]
Flags: -O2 -flto -specs=nano.specs -ggdb -fomit-frame-pointer -falign-functions=16 -falign-loops=16

[Giovanni]

Could you give a try to trunk code? there is a significant difference in the OTGv1 driver.

Giovanni

[lilvinz]

Could you give a try to trunk code? there is a significant difference in the OTGv1 driver.

Giovanni

Did test against trunk. Same behavior.

Vinz

[lilvinz]

Trace of failure:

Code: Select all

...

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00080000 /* GINTSTS_OEPINT */)
OEPINT(src = 0x00010000)
otg_epout_handle(epint = 0x00008008 /* DOEPINT_SETUP_RCVD | DOEPINT_STUP */)
_usb_ep0setup(ep = 0)
default_handler(ep = 0)
usbStartTransmit(ep = 0)
usb_lld_start_in(ep = 0)

lld_serve_interrupt(sts = 0x00040000 /* GINTSTS_IEPINT */)
IEPINT(src = 0x00000001)
otg_epin_handler(ep = 0)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01cc0080 /* ep = 0, cnt = 8, /* GRXSTSP_SETUP_DATA */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01cc0080 /* ep = 0, cnt = 8, /* GRXSTSP_SETUP_DATA */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01cc0080 /* ep = 0, cnt = 8, /* GRXSTSP_SETUP_DATA */)

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01ec0080 /* ep = 0, cnt = 8, /* GRXSTSP_SETUP_DATA */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01e80000 /* ep = 0, cnt = 0, /* GRXSTSP_SETUP_COMP */)

lld_serve_interrupt(sts = 0x00080000 /* GINTSTS_OEPINT */)
OEPINT(src = 0x00010000)
otg_epout_handle(epint = 0x00008008 /* DOEPINT_SETUP_RCVD | DOEPINT_STUP */)
_usb_ep0setup(ep = 0)
default_handler(ep = 0)
usbStartTransmit(ep = 0)
HALT

Maybe this helps getting an idea of whats going wrong.
Btw. i enabled the L4 workaround for the stm32l496.
When i find some time, i will redo the trace on a host port which doesn't show the error.
Then maybe i can see the diff.

Cheers

Vinz

[lilvinz]

Trace of different error on different host port:

Code: Select all

...

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00000008 /* GINTSTS_SOF */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01ec0080 /* ep = 0, cnt = 8, /* GRXSTSP_SETUP_DATA */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01e80000 /* ep = 0, cnt = 0, /* GRXSTSP_SETUP_COMP */)

lld_serve_interrupt(sts = 0x00080000 /* GINTSTS_OEPINT */)
OEPINT(src = 0x00010000)
otg_epout_handle(epint = 0x00008008 /* DOEPINT_SETUP_RCVD | DOEPINT_STUP */)
_usb_ep0setup(ep = 0)
default_handler(ep = 0)
usbStartTransmit(ep = 0)
usb_lld_start_in(ep = 0)

lld_serve_interrupt(sts = 0x00040000 /* GINTSTS_IEPINT */)
IEPINT(src = 0x00000001)
otg_epin_handler(ep = 0)

lld_serve_interrupt(sts = 0x00040000 /* GINTSTS_IEPINT */)
IEPINT(src = 0x00000001)
otg_epin_handler(ep = 0)
_usb_ep0in(ep = 0)
usbStartReceiveI(ep = 0)
usb_lld_start_out(ep = 0)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01e50000 /* ep = 0, cnt = 0, /* GRXSTSP_OUT_DATA */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01e70000 /* ep = 0, cnt = 0, /* GRXSTSP_OUT_COMP */)

lld_serve_interrupt(sts = 0x00080000 /* GINTSTS_OEPINT */)
OEPINT(src = 0x00010000)
otg_epout_handle(epint = 0x00002011 /* DOEPINT_13?? | DOEPINT_OTEPDIS | DOEPINT_XFRC */)
_usb_ep0out(ep = 0)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01ec0080 /* ep = 0, cnt = 8, /* GRXSTSP_SETUP_DATA */)

lld_serve_interrupt(sts = 0x00000010 /* GINTSTS_RXFLVL */)
otg_rxfifo_handler(sts = 0x01e80000 /* ep = 0, cnt = 0, /* GRXSTSP_SETUP_COMP */)

lld_serve_interrupt(sts = 0x00080000 /* GINTSTS_OEPINT */)
OEPINT(src = 0x00010000)
otg_epout_handle(epint = 0x00008008 /* DOEPINT_SETUP_RCVD | DOEPINT_STUP */)
_usb_ep0setup(ep = 0)
default_handler(ep = 0)

Hitting this: https://github.com/ChibiOS/ChibiOS/blob/stable_18.2.x/os/hal/src/hal_usb.c#L800

[lilvinz]

DOEPINT_13 seems to be "nak":
https://www.intel.com/content/www/us/en ... 93052.html

Maybe this makes sense to you.