CCS/TMS320F28379S: USB transfer data

Feng CHEN

Expert 1670 points

Part Number: TMS320F28379S
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Hi ti experts,

i have some questions need to ask help from you when i am using USB in TMS320F28379S mcu.

i want to use USB to transfer control data results to PC and the data length is very large, about 10k 16-bit words.

i used CAN bus before but its speed is very slow and takes about ~10 seconds to complete all data transfer.

as you know, USB speed is more faster than CAN. which can reach to 12M bps. so i plan to use USB.

however, i am a new user to use development.

i have looked at usb user manual and ti example code from controlsuit. Now i can run the demo "usb_dev_bulk" successfully communicating with PC. but the data length is limited to 255 bytes under the bulk mode.

my question is: what mode should be taken for my application described in upper? is there any related example code for my reference? thanks a lot.

Feng

over 6 years ago

0 Sal Pezzino over 6 years ago

TI__Mastermind 32995 points

Hi,

If you are using a Windows machine, the most throughput we have experienced is 7-8 Mbps. The Windows OS is the bottleneck. Using a Visual Studio application, it is not able to request data fast enough to achieve the full 12 Mbps.

I suggest using the USB bulk example and Host PC Visual Studio application as you have already done. Take this code and modify it to suit your needs. You can find the Visual Studio program here: C:\ti\c2000\C2000Ware_2_00_00_02\utilities\tools\f2837xd\usb_bulk_example

The bulk packet length is 64-bytes. The buffer length in software is 255 bytes. I believe you can increase the buffer length if you wish too.

But, you will likely need to continue to write to the buffer to keep filling it up for transfers.

Hope this helps,

sal

0 Feng CHEN over 6 years ago in reply to Sal Pezzino

Expert 1670 points

Hi sal,

thanks for your reply.

7~8Mbps is enough for my application.

i search from e2e forum and find some threads which are helpful

first: do you think the USB_Bulk_Stress_Test.zip you send is suitable for my application?

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/643120?tisearch=e2e-sitesearch&keymatch=tms320F28379D%252525252520controlCARD

USB_Bulk_Stress_Test.zip

second:

the below thread except SPI is what i want to do

can you give me more suggestion about these two thread and advise which is suitable for my case? thanks a lot.

Feng

0 Sal Pezzino over 6 years ago in reply to Feng CHEN

TI__Mastermind 32995 points

I recommend using USB Bulk Stress to help you do what you want. It will be similar.

Hope this helps.

sal

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CCS/TMS320F28379S: USB transfer data