USB cdc, CDC_SET_LINE_CODING and CDC_GET_LINE_CODING

[MK..1]

Hi

the USB tutorial of ST is a bit outdated. Do I still need to do the loop back of line coding in usbd_cdc_if.c in function CDC_Control_HS? I am using Stm32f4 and STM32Cube FW_F4 V1.28.0

This is mentined in this video:

https://youtu.be/h9T0RTu9Muc?list=PLnMKNibPkDnFFRBVD206EfnnHhQZI4Hxa&t=1702

Thx

[TDK]

In general, yes, although the answer will depend on the terminal software. Some of them don't care, some of them need you to return the same settings it sent to you.

 

[MK..1]

I am using python actually. Do you think it will matter with different python versions? Or on Linux/mac?

[TDK]

Yes, I do think it will matter.

And it's easy to do, so do it. That way you don't have to guess.

[FBL]

Hi @MK..1 

Here is another implementation to set LineCoding function 

 case CDC_SET_LINE_CODING:
 LineCoding.bitrate = (uint32_t)(pbuf[0] | (pbuf[1] << 8) |\
 (pbuf[2] << 16) | (pbuf[3] << 24));
 LineCoding.format = pbuf[4];
 LineCoding.paritytype = pbuf[5];
 LineCoding.datatype = pbuf[6];