i.MX Processors中的主题 Re: Usb_device_cdc_Vcom

Usb_device_cdc_Vcom

smartpavan333 — Tue, 01 Aug 2023 09:15:12 GMT

Hi,

I am using IMXRT1170-EVK board.In SDK file,

I run this example "Usb_device_cdc_vcom".It's working fine.

I am able to receive data in 10 ms when I am sending greater than 1024 bytes of data through dock-light. But when I am sending less than 1024 bytes of data, the response is 120 ms.

Please find the attached logs.

Can you suggest me where should I modify in the SDK file?

Re: Usb_device_cdc_Vcom

RaRo — Fri, 11 Aug 2023 20:00:06 GMT

Hello @smartpavan333,

Could you please tell us which of the dev_cdc_vcom examples are you using?

[SDK Import Wizard -> usb_examples]

Also, which version of SDK do you have?

Finally, how are you measuring the time of the response? Are you obtaining a mean value of the difference between the time it was send and the time it was received in Dock-light?

Best regards, Raul.

Re: Usb_device_cdc_Vcom

smartpavan333 — Thu, 17 Aug 2023 11:51:38 GMT

Hi @RaRo ,

Sorry for the delay,

1. You can choose this example of "dev_cdc_vcom_bm_cm7" or "dev_cdc_vcom_freertos_bm_cm7" anything is fine.

2.Used SDK version 2.12.1

3. Minimum delay between Tx and Rx frames is 120ms , If I am sending less than 1024 bytes.

I have used Dock-Light for sending and Receiving Data.

Re: Usb_device_cdc_Vcom

RaRo — Fri, 18 Aug 2023 21:39:12 GMT

Hello @smartpavan333,

Could you please try out the example with the newest SDK (SDK 2.14.0)?

We have tested the dev_cdc_vcom_bm_cm7 example with the newest SDK and from the last two tests we have had delays of: 6ms and 17ms. So, it might be good to try out with the SDK 2.14.0.

We attached you our results with less than 1024 bytes.

[Docklight v2.4 testing]

Let us know if that solves your problem.

Best regards, Raul.