USB hang in F28069

Naresh Desai

Hi,
I have connected USB flash drive to F28069 and can successfully read/write.
While testing, if USB connector is shaken or there is loose connection program goes into an endless loop shown below.
Even if USB is reset, connection is not reestablished.
unsigned long USBHCDPipeWrite(unsigned long ulPipe, unsigned char *pucData,unsigned long ulSize)
{
....
....
// Wait for a status change.

while(g_sUSBHCD.USBOUTPipes[ulPipeIdx].eState == PIPE_WRITING){} // here program gets in loop

....
....

}

or at
unsigned long USBHCDPipeRead(unsigned long ulPipe, unsigned char *pucData,unsigned long ulSize){

....
....
// Wait for a status change.

while(g_sUSBHCD.USBINPipes[ulPipeIdx].eState == PIPE_READING){} // here program gets in loop

....
....

}

How can I fix this problem? Any suggestions?

Regards,

Naresh

over 12 years ago

0 Trey German289 over 12 years ago

TI__Mastermind 22025 points

Naresh,

It sounds like you just have a loose connection which is upsetting the state machine that handles reads and writes of the USB pipes. Resetting the connection should fix things until another loose connections happens.

Which example are you running or is this custom code?

Trey

0 Naresh Desai over 12 years ago in reply to Trey German289

Intellectual 355 points

Trey,

I'm running usb_host_msc example for my own custom board with F28069.

I am testing USB for loose connection.Meaning that in case of loose connection, the connection should be reestablished.

As mentioned in my previous post, USB is reset using USB0Regs.USBPOWER.bit.RESET in case program goes into an infinite loop but this does not solve the problem.

USB connection is restablished only after power cycling.

Regards,

Naresh

0 Trey German289 over 12 years ago in reply to Naresh Desai

TI__Mastermind 22025 points

Naresh,

When you reset the USB, are you also re-initializing the USB stack?

Trey

0 Naresh Desai over 12 years ago in reply to Trey German289

Intellectual 355 points

Trey,

I have tried USB reset code below,

USBHMSCDriveClose(g_ulMSCInstance); // Drive close for bus free
Usb0Regs.USBPOWER.bit.RESET = 1; // hold in reset USB
DelayUs(25000L); // wait atleast 20ms time when reset status change
Usb0Regs.USBPOWER.bit.RESET = 0; // remove reset
DelayUs(25000L); // wait atleast 20ms time when reset status change

main();

but this did not work.

I have also called USBHCDTerm which completely kills the USB instance. Then I have called MSCDriveOpen and HCDInit again.

but this also not worked.

Regards,

Naresh

0 Trey German289 over 12 years ago in reply to Naresh Desai

TI__Mastermind 22025 points

Naresh,

I just double checked the example and it does not have this problem running on the controlCARD hardware. Could you share the USB portion of the schematic of your board?

Trey

0 Naresh Desai over 12 years ago in reply to Trey German289

Intellectual 355 points

Trey,

Notice that I have problem for only loose connection,

See schematic for USB of my board,

8231.USB_sch.pdf

Regards,

Naresh

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USB hang in F28069