I have a Pi Zero connected to a 4 port USB hub. One port goes to a Wifi dongle, another goes to a keyboard and another goes to a mouse dongle. The last port goes to a Windows PC. I'm trying to communicate with the Windows PC using C++ but don't know how to access that port. I'm using WiringPi to open the port using serialOpen("/dev/ttyxxxx", 9600); My question is: what would I use as a device? I looked at the /dev/ directory and only see tty0-tty63 along with ttyAMA0 (which is the serial port).
Terry
-
fruitoftheloom
- Posts: 23549
- Joined: Tue Mar 25, 2014 12:40 pm
- Location: Delightful Dorset
Re: What USB port to use?
What cable are you using to connect to the Windows PC ??tcoder wrote:I have a Pi Zero connected to a 4 port USB hub. One port goes to a Wifi dongle, another goes to a keyboard and another goes to a mouse dongle. The last port goes to a Windows PC. I'm trying to communicate with the Windows PC using C++ but don't know how to access that port. I'm using WiringPi to open the port using serialOpen("/dev/ttyxxxx", 9600); My question is: what would I use as a device? I looked at the /dev/ directory and only see tty0-tty63 along with ttyAMA0 (which is the serial port).
Terry
Rather than negativity think outside the box !
RPi 4B 4GB (SSD Boot) RaspiOS64 ARM64
Asus ChromeBox 3 Celeron is my other computer...
RPi 4B 4GB (SSD Boot) RaspiOS64 ARM64
Asus ChromeBox 3 Celeron is my other computer...
Re: What USB port to use?
It's a USB 2.0 type A connector on both ends.
-
fruitoftheloom
- Posts: 23549
- Joined: Tue Mar 25, 2014 12:40 pm
- Location: Delightful Dorset
Re: What USB port to use?
Well that is not going to work....tcoder wrote:It's a USB 2.0 type A connector on both ends.
..USB is a general purpose host-to-device (master-to-slave) I/O bus protocol, and you are connecting 2 Hosts together
Rather than negativity think outside the box !
RPi 4B 4GB (SSD Boot) RaspiOS64 ARM64
Asus ChromeBox 3 Celeron is my other computer...
RPi 4B 4GB (SSD Boot) RaspiOS64 ARM64
Asus ChromeBox 3 Celeron is my other computer...
Re: What USB port to use?
Maybe have something that can act as a slave to both the RPi and the PC. Thanks for setting me straight.
-
fruitoftheloom
- Posts: 23549
- Joined: Tue Mar 25, 2014 12:40 pm
- Location: Delightful Dorset
Re: What USB port to use?
??????????? https://learn.adafruit.com/adafruits-ra ... e?view=alltcoder wrote:Maybe have something that can act as a slave to both the RPi and the PC. Thanks for setting me straight.
Rather than negativity think outside the box !
RPi 4B 4GB (SSD Boot) RaspiOS64 ARM64
Asus ChromeBox 3 Celeron is my other computer...
RPi 4B 4GB (SSD Boot) RaspiOS64 ARM64
Asus ChromeBox 3 Celeron is my other computer...
Re: What USB port to use?
The only USB devices which can be used to connect a
host and another host sensibly together to exchange data
are those "PC-Link" cables which obviously must contain
active electronics. Those do NOT emulate serial ports.
ghans
host and another host sensibly together to exchange data
are those "PC-Link" cables which obviously must contain
active electronics. Those do NOT emulate serial ports.
ghans
• Don't like the board ? Missing features ? Change to the prosilver theme ! You can find it in your settings.
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
Re: What USB port to use?
I think that intercepting keyboard input is the way to go. My device only has an LCD module to display messages and I need some way for the user to send configuration info so I can configure a Wifi module.
Re: What USB port to use?
Using a USB-TTL-UART adaptor sounds like a sensible option in that context.
But i would simply connect the USB end to my laptop/desktop and the jumper wires
to the Pi instead of the other way round.
ghans
But i would simply connect the USB end to my laptop/desktop and the jumper wires
to the Pi instead of the other way round.
ghans
• Don't like the board ? Missing features ? Change to the prosilver theme ! You can find it in your settings.
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
Re: What USB port to use?
I've already built the prototype circuit board and the only user accessible method is via a USB port. I needed it to be user friendly and not have to use a DB-9 connector or something antiquated. The USB port was the only technically current method to enter data into the device. I'm thinking of having the Wifi as an access point instead.