How can i set baud rate greater than 115200 for virtual com port?

[fzhan.2]

I'm now using NUCLEO-L476RG. My PC connects to the board by virtual com port? And i try to set a baud rate greater than 115200 but the data received from usart2 is wrong. However, when i set the baud rate less than 115200, it works well.

So i wanna ask that if 115200 is the upper limitation of virtual com port? If not, how can i set a higher one?

[AScha.3]

USB not active, no clk....this is your clock tree, where you complain about usb vcp speed ??

[fzhan.2]

yes, actually i am using usart2 to transmit data to VCP. But you are right, maybe i can try using usb for a higher speed

[AScha.3]

obviously we are in different worlds . VCP IS USB , in serial mode.

where you connect the uart ???

[fzhan.2]

Emm, maybe i misunderstand some concepts. Thank you for pointing it out。

[AScha.3]

Virtual COM port (VCP) drivers cause the USB device to appear as an additional COM port available to the PC. Application software can access the USB device in ... (ftdi)

[fzhan.2]

But i wonder that what happens when stm32 sends data to usart2, even though i did not activate usb, i still receive data from VCP in PC.

[Peter BENSCH]

If you are using a development board like the NUCLEO, the ST-LINK there converts a USART to VCP, for which there is a connection from that USART to the STM32 of the ST-LINK. USB does not need to be activated for VCP to function (if it exists at all at the target).

Regards

/Peter

[fzhan.2]

Ok, i see. Thank you.​

[AScha.3]

aa, you using the built-in vcp of the onboard st-link.

then your max. speed is, what this onboard thing can do; should be given somewhere in manual.

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>How can i set baud rate greater than 115200...

then you need to use the usb/device/vcp on STM32L476 chip...

[fzhan.2]

Thanks. I will check that