[FR] Independent baudrate setting for secondary serials

[karabas2011]

I want to connect different serial devices to my boards
some of them are 9600, some 115200.
For Pronterface-USB connection I use 250000
But marlin 2.0 does not allow to set separated baudrates for secondary serial.
Any hack?

[ellensp]

You can just edit Marlin/src/Marlin.cpp find MYSERIAL1.begin(BAUDRATE); and change BAUDRATE to be a number.. (Some ofther board have it set elsewhere eg Marlin/src/HAL/HAL_LPC1768/main.cpp

[ellensp]

Or add the line #define BAUDRATE1 9600 to your configuration.h and change MYSERIAL1.begin(BAUDRATE); to MYSERIAL1.begin(BAUDRATE1);

[karabas2011]

Big thanx! Last question
I use ESP wifi on secondary port and want to connect third device on 9600 on spare pins.
Is it possible? ( I need only TX pin no RX from device)

[ellensp]

Sure it can be done... but not without coding... The firmware would need to know what is on the serial port in order to talk to it. Also if its a 8 bit controller, it pays to use real hardware serial ports.

[karabas2011]

Sure it can be done... but not without coding... The firmware would need to know what is on the serial port in order to talk to it. Also if its a 8 bit controller, it pays to use real hardware serial ports.

For low baudrate devices I used software serial lib ( for arduino) a couple years ago. It worked on any spare pins. Now for Marlin 2.0 I did not try this lib.

[sjasonsmith]

I think this is closely related to #17599. The more ports available, the more important this becomes.

[slowbro]

#21949 was merged, this can be closed.

[github-actions]

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