Serial Flow Control

Posted on Thu 18th, May 2017

• #1

Sacha

Dear Espruinos

I use several picos with an xbee modul to communicate to each other.
I only connected power and rx/tx. So there is no flow control used.

Maybe as a result, when i communicate faster than 2400bps i have data losses.

I would like to test it with flowcontrol. Do the pico support HW flowcontrol ?

Thanks for your advise

Sacha
• #2

allObjects

I know that there is xon/xoff flow control, but did not see any option that you could specify pins for HW flow control - see reference Serial_setup
• #3

Sacha

Thanks. As far a i know the xbee modules only supprts HW flow control.
@Gordon: What about HW flowcontrol ?
• #4

Gordon
Conveniently, it was something I added last week and which will be in 1v93! If you use one of the cutting edge Espruino builds (newer than 1v92) then it should have it.

If you do:
```
Serial.setup(9600, {rx:..., tx:..., cts: ...});
```
Then Espruino will set the CTS pin to 0 whenever it is ready to receive data, and to 1 whenever it is too busy to receive. It doesn't do flow control on transmit, but I imagine that is unlikely to be your problem with xbee modules.

Hope that helps!

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