In config I have used
dtoverlay=pi3-miniuart-bt
I still want to use the bluetooth connection
How do I set bluetooth to use ttyS0 instead of ttyAMA0
A doc stated
It is also necessary to edit /lib/systemd/system/hciuart.service and replace ttyAMA0 with ttyS0
But there is no such thing as ttyAMA0 in the hciuart.service
If you have properly changed /boot/config.txt file and later rebooted your RPi, your Bluetooth should automatically be using ttyS0. You can check that by running
ls -l /dev
and looking for a line saying
serial1 -> ttyS0
If serial1 does not appear to be mapped to ttyS0, then I recommend checking if this line
dtoverlay=pi3-miniuart-bt
is a right choice for your Raspberry Pi Zero. It has proved to work well for RPi 3&4, but you need to look it up if it is right also for the Zero.
Related
I'm trying to communicate with a Di245 through its Virtual COM driver (VCD) in Linux (pdf) and I'm having a strange issue. Internally, an FTDI chipset is used by this device (FT232BL).
Attaching the device by itself isn't registered as a VCD, so I do the following:
sudo modprobe usbserial vendor=0x0683 product=0x2450
which results in the following dmesg message:
usbserial: USB Serial support registered for generic
usbserial_generic 3-3:1.0: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 3-3:1.0: Tell linux-usb#vger.kernel.org to add your device to a proper driver.
usbserial_generic 3-3:1.0: generic converter detected
usb 3-3: generic converter now attached to ttyUSB0
and I get the /dev/ttyUSB0 device as promised. So far, everything seems ok.
However, if I open the port in my code, I get a bunch of 1` from it (alternating 1 and `). Trying with screen:
screen /dev/ttyUSB0 115200
I continuously receive 1`. This is definitely not something the device is sending and oddly enough, if I put a random baudrate, I keep getting the same thing.
Is this a way some error is being reported? What could be triggering this behavior and how can I address it?
The solution was the following:
# modprobe usbserial vendor=0x0683 product=0x2450
# modprobe ftdi_sio
# echo "0683 2450" >> /sys/bus/usb-serial/drivers/ftdi_sio/new_id
This way, the ftdi_sio driver knows which vendor/product to provide VCD for. The following udev rule (say, 99-di245.rules) can automate this:
ACTION=="add", ATTRS{idVendor}=="0683", ATTRS{idProduct}=="2450", RUN+="/sbin/modprobe ftdi_sio" RUN+="/sbin/modprobe usbserial vendor=0x0683 product=0x2450" RUN+="/bin/sh -c 'echo 0683 2450 > /sys/bus/usb-serial/drivers/ftdi_sio/new_id'"
It is installed with:
$ sudo cp 99-di245.rules /etc/udev/rules.d
$ sudo udevadm control --reload
Within a bash script, I use the following:
$ stty -F /dev/ttyUSB0 921600 raw
$ echo -n "some test data" >/dev/ttyUSB0
and it works as expected.
Using a PL2303 USB to RS232 adapter:
$ lsusb
...
Bus 006 Device 010: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 006 Device 011: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Now I tried to do the same with 1 MBd, but got an error:
$ stty -F /dev/ttyUSB0 1000000 raw
stty: /dev/ttyUSB0: unable to perform all requested operations
Also the same message when I try with 500 kBd. Trying 250 kBd the error message is different:
$ stty -F /dev/ttyUSB0 250000 raw
stty: invalid argument `250000'
Try `stty --help' for more information.
As seen here, it's a problem in the PL2303 linux driver.
I'm working on Kubuntu 12.04, 32 Bit. Unfortunally, I don't know how to fix that driver on my system (getting driver source, patch em, compile, install … hmm, maybe I learn a bit and give it a try - advice is welcome).
But maybe there is an updated driver avaliable which is easy to install?
Or does someone know an alternate USB to RS232 adapter which works at 1 MBd (hardware flowcontrol via rts/cts is needed, which works pretty well with the PL2303)?
After the realization that »Prolific and FTDI are competitors«, I bought Ftdi US232R-10 which is a FT232R based device and specified for 1 MBd transfer rate.
With this adapter I'd successfully tested communication at 1 MBd by transfering some GiB data without any error (including usage of Rts/Cts hardware flow control).
Configuring this device using stty like:
$ stty -F /dev/ttyUSB0 1000000 raw
works successfully.
Trying to solve this problem (ttyUSB0 that works properly than stop working after about 1hr)I'm thinking on if disconnecting and reconnecting the usb device could be a good fix.
So, it is possibile to cut down power to the USB device and repower it programmatically (bash)?
# lsusb -t
1-1:1.0: No such file or directory
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, Class=vend., Driver=, 12M
|__ Port 1: Dev 2, If 1, Class=vend., Driver=cp210x, 12M
On am335x, kernel 3.2.0, ubuntu core armhf.
[ 1.784332] usb 1-1: cp210x converter now attached to ttyUSB0
At the moment I need a complete power cycle to have ttyUSB0 back.
This is the solution:
Find the identity of your usb device.
# tree /sys/bus/usb/drivers/cp210x/
/sys/bus/usb/drivers/cp210x/
|-- 1-1:1.1 -> ../../../../devices/platform/omap/musb-ti81xx/musb-hdrc.1/usb1/1-1/1-1:1.1
|-- bind
|-- module -> ../../../../module/cp210x
|-- remove_id
|-- uevent
-- unbind
So 1-1:1.1 is the identifier of my ttyUSB0(it can be discovered also via dmesg).
Then, disconnect the device (as root):
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/unbind
reconnect it
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/bind
At this point I had the same device but with a different name, it was now ttyUSB1 instead of ttyUSB0.
- To avoid this I added a new rule in /etc/udev/rules.d/ by creating a new file named 99-usb-serial.rules with this line:
SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea70", ATTRS{serial}=="002DCFAF", SYMLINK+="sameName", MODE:="0666"
where idVendor, idProduct and serial must be the values of your device. This rule will create a new device called sameName linked to the ttyUSB* device normally generated from the OS.
As #Robert Harvey Said,
You first need to find our driver that will help you 'unplug and plug' the usb. Type: ls /sys/bus/usb/drivers which should print something like this: btusb ftdi_sio hub usb usbfs usbhid usbserial_generic uvcvideo. These, are all the drivers for each usb device. Now, lets say mine is ftdi_sio, which is a device i use to program my arduino (atmega328p chip). I am not sure how Your/other usb devices name themselves there. Like, i dont know which of these is my mouse.
Now, you can see the driver's commands using:
ls /sys/bus/usb/drivers/ftdi_sio/, which will print something like: 1-4:1.0 bind module uevent unbind, Where 1-4:1.0 is the device's characteristic code, and the bind and unbind command, which are the 'plug' and 'unplug' command respectively.
Now, if i want to unplug programatically the ftdi usb port, i will type:
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind
and, to plug it again:
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
Now, we can combine all the commands together, with a ';':
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind ; echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
I'm using CentOS 6 and I have two serial ports (two USB interfaces on two different ports), USB1 and USB2. When I connect the USB1, the OS sets her patch to "/dev/ttyACM0", and when I connect the USB2, "/dev/ttyACM1".
But when I connect first the USB2, the OS sets her patch to "/dev/ttyACM0" and no to "/dev/ttyACM1". I need that the USB1 patch be "/dev/ttyACM0" and USB2 "/dev/ttyACM1", regardless of the order that I connect the interfaces. How I do to do it?
Thank you
Create a udev rule that defines the symlink based on the attributes of the USB device (such as the serial number).
Find out information about your device-
udevadm info -n /dev/ttyACM0 -a
udevadm info -n /dev/ttyACM1 -a
Then go into /etc/udev/rules.d/ and create a udev rule. Something similar to the blurb below. Here is a good reference. For lots of examples and more discussion, do searches for udev persistent usb serial.
SUBSYSTEM=="tty", ATTRS{idVendor}=="0000", ATTRS{idProduct}=="0000", ATTRS{serial}=="000001", SYMLINK+="ACM0"
SUBSYSTEM=="tty", ATTRS{idVendor}=="0000", ATTRS{idProduct}=="0000", ATTRS{serial}=="000002", SYMLINK+="ACM1"
As the title says!
I can read info from the device with "dmesg" and see it when "lsusb" but how do I attach/install it as for example dev/ttyUSB2
One way is to change the VID and PID with FTDI software FT Prog (utility for programming the EEPROM of FTxxx devices). Change to 0403 and 6001, Linux will then recognise it as a generic FTDI.
If you don't want to modify the ftdi chips settings, you could just add the VID / PID to the list of ids recognized by the ftdi driver. To do this at run time (non permanent) do:
modprobe ftdi_sio
echo "1c40 0477" > /sys/bus/usb-serial/drivers/ftdi_sio/new_id