TMS320F28069: : Steps to stop the USB-Stack then re-initialize it

Hi,

Will respond to your query in a couple of days.

Best Regards

Siddharth 

Hello Siddharth , Any update?

Hi, 

You can try to reset the USB peripheral by using the following code in the USB Library

//
// Reset the USB controller.
//
MAP_SysCtlPeripheralReset(SYSCTL_PERIPH_USB0);

//
// Enable Clocking to the USB controller.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0);

//
// Turn on USB Phy clock.
//
MAP_SysCtlUSBPLLEnable();

Best Regards

Siddharth

Hello,

Yes these will set the USB clock and PLL settings.  

We are working in HOST mode on the USB.  

When this error happens I need to  stop/terminate/close the USB-Stack then re-initialize it. 

Can you help me with the USB library commands to do this so the all of my USB registers are reinitialized and any potential "error" flags in the registers are cleared out?   

Hi, 

In this case, will it be similar to a device disconnect event? 

Do you want to disconnect any devices connect and enumerate them again?

Best Regards

Siddharth

Hello,

Yes, the following steps I need assistance on  

1.  I’d like to disconnect a device.

2.  Then reset the entire USB stack registers and states to default (but I need help on this part)  

3.  Check for any “error” conditions that need resetting  in the usb registers  

4.  Then reconnect  

these are the 4 steps I need help on  and mostly steps 2 & 3  

thank you  

Hi,

There is no bit to reset all the USB registers to default. 

Following sequence to be followed

1. USBHCDDeviceDisconnected is the function to be called, it handles the necessary clean up for device disconnect. 

2.  USBHCDTerm, this function will clean up the USB host controller and disable its operation (shutdown or a switch to USB device mode.) 

3. USBHCDInit() may be called to reinitialize the controller and prepare for host mode operation. USBHCDInit is the function to be called to  perform all the necessary operations to allow the USB host controller to begin enumeration and communication with devices.

Best Regards

Siddharth

Hello,

Yes thank you for this.  I have done all 3 of these.  

I find I still have a problem when I run USBHCDTerm() functions that Inside this function it sets the DEVCTRL.session bit to 0. By calling the USBOTGSessionRequest(USB0_BASE, false);

And then in USBHCDInit it sets the DEVCTRL.session to 1 by calling this function  USBOTGSessionRequest(USB0_BASE, true);

My problem is that if I ever set the session to 0 using USBHCDTerm I can never get a USB to connect again until I do a full DSP reset.  In order to run all 3 of the operation you provided (including a  USBHCDDeviceResconnect) I must manually comment the line 

// USBOTGSessionRequest(USB0_BASE, false);

I need helping understanding why this is so.  I have to now edit the USBHCDTerm to not set session to 0.  

Resetting session is not working. 

Thanks,

Hi , 

Can you  try to force the stack to be in host mode by calling the following function after USBHCDTerm

USBStackModeSet(0, eUSBModeForceHost, ModeCallback);

Also , is this the same query as below - 

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1229943/tms320f28069-how-to-reset-usb-registers

Best Regards

Siddharth

Hello,

I have tried calling the USBStackModeSet() function but with same result. 

appears that it is going to OTG side B mode. And I don’t know how to switch it back to OTG  side A mode. I can see this by looking at the DEVCTL register bit 7. 
Once this bit is set to 1, nothing I do will get it to go back to 0.  any suggestions on how to get this to go back to OTG side A mode? 

 Is there a better manual on how to use and configure the USB then the full TI28069 reference manual?

 Thanks for your help

Hello,

is there a reference document for using the USB in the Ti28069.

 Thanks

Hi, 

The TRM is the only document available for the USB registers.

  USBStackModeSet should have forced the mode to host .  

Will let you know if I have any other inputs on this issue.

Best Regards

Siddharth

Hi,

I found in the c2000Ware the following doucment:

F2806x_USBL_UG.pdf

C:\ti\c2000\C2000Ware_4_02_00_00\libraries\communications\usb\f2806x\docs\F2806x_USBL_UG.pdf

Can you please help me find any other resource documents / tutorials / examples on how to use and troubleshoot the USB on the Ti28069 processor.

I've also found this on Ti Website:

USB Library API Reference

https://software-dl.ti.com/simplelink/esd/simplelink_msp432e4_sdk/4.20.00.12/docs/usblib/msp432e4/api-guide-html/html/index.html

Thank You.

Hi, 

The API guide provides the details of the functions included in the USB Library , it may not help in resolving the issue that you are seeing.

Will let you know if I have any additional inputs to help you in resolving this issue..

Best Regards

Siddharth

Hi Siddharth,

Is there a way to request/hire a Ti engineer ( like yourself or someone else) that is skilled in ti28069 and in particular with USB. And do a Microsoft teams call where I can share my computer screen and we can go over the firmware code and look at the registers while debugging the code together?  

thanks,