Il 30/12/2020 19:31, Martin Gregorie ha scritto:
> On Wed, 30 Dec 2020 16:19:56 +0100, RobertoA wrote:
>
>> The Raspberry4 board has 6 native uart I'm not talking about serial
>> ports via usb but uart on the gpio connector of the Raspberry board
>> Having to control devices via uart (for example gps receivers,
>> electronic scales, etc.) it would be useful to create a device that,
>> communicating with the control computer via ethernet, would allow the
>> computer to 'see' the virtual com ports, corresponding to the uart of
>> the card Raspberry So it will be necessary to program the Raspberry so
>> that it has a tcp /
>>
> Ignore the gpio lines: Just get a standard a USB-serial adapter. Each
> supports a single serial line, so get one for each device with a serial
> port that you need to connect to the Pi and either plug them directly
> into the Pi or, if you run out of USB ports, via a USN connector block.
>
> The ones I've used have all presented a common interface to Linux:
> plugging one in on a Pi automatically creates a new serial device, /dev/
> ttyUSBnn IIRC, that behaves exactly like one of the predefined serial
> ports (/dev/ttynn) that are created at boot time on a PC with builot-in
> serial ports. This means that any program using the standard Linux serial
> port library routines can read and write to anything connected to your Pi
> via a USBserial adapter. It can also set the baud rate, character size,
> parity and stop bits.
>
> The last Serial USB adapter I bought came from PicAxe, where they're used
> to upload PIC binaries to a PICAXE chip and/or to let the program you
> uploaded to the PICAXE chip talk to a program on your Linux box. They
> work just fine if that's a Pi too.
>
> PICAXE http://www.picaxe.com/ sell adaptors for £12.49 (VAT incl) +
> postage:
>
> https://picaxe.com/hardware/cables/picaxe-usb-download-cable/
>
>
> I'm certain they're available elsewhere too, but that's where I bought
> the last one I needed.
>

Why ignore the uarts provided on the gpio connector?

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