problem in removing usb(HOST) while writing in USB in tm4c129x.

Hello Vidushi,

Where does the USB Host for MSC hang? You have not mentioned any level of debug done at your level.

Regards
Amit

Hi Amit,

Complete system look like hanged. When i debug i came to know that it is in USBHostenum.c, usb.h kind of files.There is no particular point where it get struck always found in different files of Usb host apis and also came to know that all interrupts in startup_ccs.c file above USBOTGinterruptHandler is working but not USBOTG handler.

Regards

Vidushi

Hi,

Can you share me any link for that??

Hello Vidushi

Search it my friend. The tittle should be "babble interrupt"

Regards
Amit

hi Amit,

Ya i have checked on forum e2e.ti.com/.../393726 browse few similar issue but didnt get optimal solution can u tell me in short?

if(g_sUSBHCD.ui32IntEvents & (INT_EVENT_DISCONNECT |
INT_EVENT_VBUS_ERR |
INT_EVENT_POWER_FAULT))
{
//
// Set the pipe state to error.
//
g_sUSBHCD.psUSBOUTPipes[ui32PipeIdx].iState = ePipeError;

//
// Needs to be set to exit out of large while loop.
//
ui32RemainingBytes = 0;

break;
}

Tried this Through this i can prevent hanging situation but after this return USBMode is Device always whether i have connect HOST/DEVICE/NONE.

Can you please help me?

Regards
Vidushi

Hello Vidushi,

I think the solution to this issue is to reset the USB Controller to and re-initialization. Also are you using OTG mode or using Force Host Mode?

Regards
Amit

Hi Amit,

Thanks for your early response.

I am using USB OTG mode. Is there any particular APIs of yours that i can use directly? or in a simple way PeripheralEnable ?

Regards

Vidushi

Hello Vidushi

It is SysCtlPeripheralReset to reset the USB controller.

Regards
Amit

Hi Amit,

Yaa same. Ok i'll try that on Monday.

Regards
Vidushi

Hi Amit 

I tried that you suggest me in the last attaching section of code i patched in PipeRead

if(g_sUSBHCD.ui32IntEvents & (INT_EVENT_DISCONNECT |
INT_EVENT_VBUS_ERR |
INT_EVENT_POWER_FAULT))
{
//
// Set the pipe state to error.
//
g_sUSBHCD.psUSBINPipes[ui32PipeIdx].iState = ePipeError;

//
// Needs to be set to exit out of large while loop.
// 
ui32RemainingBytes = 0;                                                              //Patch
SysCtlPeripheralDisable(SYSCTL_PERIPH_USB0);             //Patch
SysCtlPeripheralReset(SYSCTL_PERIPH_USB0);                //Patch
SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0);              //Patch

Init_USB_OTG();                                                                            //Reinitialize Port Pins Feature Set and all

break;
}

Due to this patch i am able to detect right Mode of USB OTG but USB Downloading & uploading not working after inserting USB host again it got struck in USBHMSCDriveReady() function When trying for Enumeration_State.

Can you suggest anything for this also.

Regards

Vidushi

Hello Vidushi,

You should not modify the sequence in the library code, but in a higher priority task in the application layer.

Regards
Amit

Hi,

Did/nt get your point Sir. Can you please elaborate more?

Regards

Vidushi

Hello Vidushi,

I will exemplify using WDTimer. The WatchDog Timer can be set to a large value like a second. The Application must clear the WDTimer before the interrupt of the WDTimer gets asserted. that way the application can keep a track of the hang condition in software. As long as the application is working fine it will reload the WDTimer causing it never to fire an interrupt. However if it is stuck in a loop then it causes the CPU to go to the WDTimer Interrupt handler where it can disable-reset-enable-init the USB and then begin a new execution task.

Regards
Amit

Hi Amit,


Actually When i don't know about babble interrupt at that time i did the same WTDog Timer Disable Rest & Enable with some reloading factor. But it is getting false interrupt even reloading with larger value.

once I reload it before IntEnable & in second way i Reload it after IntEnable in bot case even after relaoding with 12000000 value it is getting Interrupt even if system is working fine.So thats the problem with watchdog in my case.


Regards
Vidushi

Hello Vidushi,

That should not be the case. Which WDT are you using? Check the errata there is a problem with one of them. In the meantime (will take me some time) I will check the recovery mechanism

Regards
Amit

Hi Amit,

I am using WDT0(Watchdog Timer 0).

Regards

Vidushi

Hi Amit,

We can't use Complete Device Reset because our application is Protection based if Arm(Master) in our case get Reset then complete system has to do all facts figures calculations related to all protections again which is not acceptable in our case.

If WDT allow Peripharal(USB0) Reset only that will be acceptable.so please tell the relevant solution.

Regards
Vidushi

Hello Vidushi

WDT has the option to generate a NMI instead of a Reset. You can use the NMI feature

Regards
Amit

Hi Amit,

Ok ill try that also but my main concern is after babble interrupt USB Detects But Unable to do Read write got struck in USBHMSCDriveReady function in USBhmsc.c API??

Regards

Vidushi

Hello Vidushi,

That is why the reset of the USB and subsequent reinit will resolve the same.

Regards
Amit