What is the maximum baud rate for STM32F439ZI-Nucleo144 when using USART?

[DKhut.1]

I am using 115200 bits/s for now and was wondering if I can increase that. If yes, how much can I go until? I checked the datasheet for this board and nothing was mentioned about the baud rate.

[Tesla DeLorean]

Easily several Mbps

Limits tend to be APB / 16 or APB / 8 depending on the Over Sampling settings. I suspect you're just looking in the wrong place.

[DKhut.1]

That really helped, thank you!

[Tesla DeLorean]

Practical limits might be lower, or you'll need to use DMA to sustain them.

Async serial also has very little protection or integrity checking, so people tend to use synchronous methods as speeds increase.

RS232 level converters also have bandwidth limitations at/beyond 1Mbps

[DKhut.1]

Yes, we are using DMA to sustain the data.

[TDK]

> I checked the datasheet for this board and nothing was mentioned about the baud rate.

It's in there the datasheet for the chip.