TM4C123 USB Bulk Device Tx Buffer

Saul Espinosa

Hello,

I'm using USB Bulk example to emulate AT commands under USB. so sometimes I require more characters in my Tx Buffer than the Rx Buffer.

I there any way to clear the Tx Buffer? Currently I cannot send more number of characters than the Rx Buffer length.

over 9 years ago

0 Amit Ashara over 9 years ago

TI__Guru**** 244440 points

Hello Saul,

Why not use the usb serial example which enumerates a COM port?

Regards
Amit

0 Saul Espinosa over 9 years ago in reply to Amit Ashara

Prodigy 140 points

Data transfer speed now is a matter to us, since this is a test equipment. Bulk transfer speed is better and we have DLLs developed for this. I just want to know at detail how the USB buffers are working.

0 Amit Ashara over 9 years ago in reply to Saul Espinosa

TI__Guru**** 244440 points

Hello Saul

I would need to check if the TX and RX buffer pointers can be disjoint.

Regards
Amit

0 Saul Espinosa over 9 years ago in reply to Amit Ashara

Prodigy 140 points

I was going thru all the usb .c and .h files. Seems like the TX and RX Buffers are independent, but it's not clear how the Index to get the Character collection is working.
Anyway my counter part for PC application just released a new DLL and I can see my information correctly sent to the bus, some trash is in there sometimes.
The issue is in the PC application provided in TIVAWARE, please fix it or advise other users about this.

Thanks and Regards

Saul

0 Amit Ashara over 9 years ago in reply to Saul Espinosa

TI__Guru**** 244440 points

Hello Saul,

And can you elaborate on what is the issue?

"The issue is in the PC application provided in TIVAWARE, please fix it or advise other users about this."

Regards
Amit

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C123 USB Bulk Device Tx Buffer