Serial connection (UART) not clear in readme.md

[FollyMaddy]

Hi Graham,

First of all, It's really great what you are doing here, amazing !

I had to overcome some troubles,but now I have a picture on the monitor.
So that's really nice !

I am now trying to send keyboard events to the pico from my rpi4.
Reading your readme it's a bit unclear what pins I have to use for this.
Do I have to use gpio21 of the pico to receive the uart communication ?
And, do I have to use gpio14 of the rpi4 to send the uart communication ?

With using the forwarder :
It's not directly clear to me what the ttydev / ttyUSB0 device is.
Perhaps a dumb question, but Is it the keyboard the ttydevice ?
Or is it an USB-SERIAL(UART) dongle to communicate with the pico ?
And, can I use a gpio pin of the rpi instead ?

What do I have to do to get it working (using the gpio pins would be nice) ?

[kilograham]

ah good point; i'm so used to having a UART set up

https://datasheets.raspberrypi.org/pico/getting-started-with-pico.pdf section 4.5 tells you how to setup (though as you realized you need to use pin 20/21 on the Pico not 0/1)

[FollyMaddy]

Thanks.
Seems I am in the good direction, because I already read some of that section.
I will look deeper into that.
Will let you know how it goes.

[FollyMaddy]

It's working !
But there is no info in the forwarder window, is this correct ?

Can you put the next information in your readme.md ?

First enable the serial port in raspi-config and reboot the RPI.

Make the connections :
RPI <=> pico
GND (Pin 14) <=> GND (Pin 28) (it works without this, if the pico is connected in the USB of the RPI)
GPIO15 (UART_RX0, Pin 10) <= GP20 (UART0_TX, Pin 26) (it works without this)
GPIO14 (UART_TX0, Pin 8) => GP21 (UART0_RX, Pin 27) (important)

Use the sdl_event_forwarder with this command :
./sdl_event_forwarder /dev/serial0