CCS/TM4C1294NCPDT: CCS/TM4C1294NCPDT

srinivasan Bhuramoorthy

Intellectual 460 points

Part Number: TM4C1294NCPDT

Tool/software: Code Composer Studio

Hey,

I am using USB communication in TM4C1294. I am using the usbserialdevice example code.

I have an external GUI to send data to the controller. I want to generate interrupt for every data sent.

The USB connection is being closed after sending and receiving of data. How to keep that USB connection active always.

Regards,

Srinivasan

over 5 years ago

0 Ralph Jacobi over 5 years ago

TI__Guru*** 135355 points

Hello Srinivasan,

You would need to use an Interrupt Transfer to do that, but they are very limited:

Interrupt Transfers have a limited latency to or from a device. In USB, an Interrupt Transfer, or Interrupt Pipe, has a defined polling rate between:

- 1ms and 255ms for full and low-speed
- 125μs to 4096ms for high-speed endpoints.

The maximum packet size for the interrupt endpoint data is:

- 64 or less bytes for full-speed
- 1024 or less bytes for high-speed

By the way, as a CDC device you wouldn't be able to use that for data transfer, the CDC data transfer occurs via Bulk transfers.

0 srinivasan Bhuramoorthy over 5 years ago in reply to Ralph Jacobi

Intellectual 460 points

Hey Ralph,

Is there any example code for usb serial device without using TI-RTOS?

If available can you share me the example.

Thanks and regards

Srinivasan

0 srinivasan Bhuramoorthy over 5 years ago in reply to srinivasan Bhuramoorthy

Intellectual 460 points

Hey Todd,

I have attached the log file

ATT99466.log

I am loading the log file from the following location.

C:\Users\Dell\workspace_v9_2\.metadata

Is this the correct file?

If wrong please let me know the correct directory, so that I can upload the file

Thanks and regards,

Srinivasan.

0 Ralph Jacobi over 5 years ago in reply to srinivasan Bhuramoorthy

TI__Guru*** 135355 points

Hello Srinivasan,

Yes we do have an example for that which will be released soon with the upcoming TivaWare update, I can share it with you in advance here: 0523.usb_dev_cdcserial.zip

0 Ralph Jacobi over 5 years ago in reply to srinivasan Bhuramoorthy

TI__Guru*** 135355 points

srinivasan Bhuramoorthy said:

Hey Todd,

I have attached the log file

ATT99466.log

I am loading the log file from the following location.

C:\Users\Dell\workspace_v9_2\.metadata

Is this the correct file?

If wrong please let me know the correct directory, so that I can upload the file

Thanks and regards,

Srinivasan.

Hello Srinivasan,

I think you posted the above message on the wrong thread. :)

0 Charles Tsai over 5 years ago in reply to srinivasan Bhuramoorthy

TI__Guru**** 190746 points

Hi,

srinivasan Bhuramoorthy said:
Is there any example code for usb serial device without using TI-RTOS?

Can you provide some update? Did you have a chance to reference the example provided by Ralph in his reply on Thu, Jan 16 2020 1:38 PM?

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CCS/TM4C1294NCPDT: CCS/TM4C1294NCPDT