Serial Device: usart speed change "on the fly"

[ucasano]

Hi,

I need to change the speed of my serial port driver, i.e. at 57600bps, after the serial driver has already been started, i.e. at 9600bps.

In order to do so, I have to start at 9600bps, send the AT command "AT+IPR=57600", wait for OK answer and then switch to 57600.

This is what I think to do:

1) send sdStop()
2) change speed parameter to 57600bps
3) send sdStart()

Could this be working for me?
Thanks.
-g

[Giovanni]

Hi,

You don't need to stop, just call sdStart() again to set new parameters, of course you need multiple configuration structures.

Giovanni

[ucasano]

Alright, I will do so!
Thanks.
-g

[kalevik]

Hi,

You don't need to stop, just call sdStart() again to set new parameters, of course you need multiple configuration structures.

Giovanni

You must be kidding

If i make user selectable communication parameters (with dip switch), lets say 1200-115200 and 1/2 stop bit, i must wrote 16 configuration structure?

kalevik

[Giovanni]

You can have one structure and change it or multiple constant structures.

Giovanni

[kalevik]

You can have one structure and change it or multiple constant structures.

Giovanni

Okay, i understand wrong your answer to ucasano, "of course you need multiple configuration structures".

kalevik

[rew]

You don't need to stop, just call sdStart() again to set new parameters, of course you need multiple configuration structures.
i

This is inconsistent with lots of other stuff in Chibios: Many things in Chibios don't tolerate being restarted by "just call start again", because they are not in the right "state".

[Giovanni]

Start is meant to be call-able when the device is in "started" state, not when it is in "active" state, you cannot call start when there is an operation in progress.

Serial does not have a defined "active" state and can be always restarted. Look at the assertions in the driver to see the valid states (or the HAL documentation, there are state diagrams there).

Giovanni