Lower than 19200 Baud Rate in Arduino IDE?

Official Hardware Nicla Family Nicla Vision
1

Hi all,

I am using the Nicla Vision in Arduino IDE to transmit over UART to a different microcontroller. For various reasons, I cannot change the baud rate (9600) expected on the other end.

I know the user manual states that 19200 is the minimum baud rate for this board in Arduino IDE, but I find it particularly perplexing that I can run mostly equivalent code in OpenMV that works at 9600 baud; this clearly indicates that the hardware is capable of this mode of operation.

Why is this the case, and does anyone happen to know if there is a way of changing this at all?

2

Not an answer to your issue but some thoughts:

It's probably not a hardware limitation since you say it works with a different firmware (OpenMV).

Since it's in the arduino documentation, it's likely a software constraint of the Arduino Mbed OS Nicla core to avoid instability in their Serial implementation (likely chosen to avoid timing issues, buffer overflows, or communication instability - like pipelines filling up too fast compared to sending the data out).

Just curious about what's on the other end and how big the payload you are transferring is.

3

Thank you very much for the detailed answer.

That makes sense, though modifying the Nicla's OS is a little complicated for my level.

For your question, I was working with an existing platform whose baud rate I thought I couldn't change.

It turns out that I was wrong and this is not the case, so I'll be able to use 19200 baud just fine.

Thanks again.

4

Glad to hear You Have a solution