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There is a driver that replaces the standard driver for the ISA UART 16550 chip on IBM-compatible PCs (documentation), but this does not work on different architectures. To connect an existing /dev/tty* device with ALSA, try a daemon such as ttyMIDI.


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There is a presence indicator to tell you that you have a device connected to the other end, but it is optional, transmission works with or without the presence signal.


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A UART is a Universal Asynchronous Receiver and Transmitter. It is a device which takes parallel bits of data, as found in the computer, and serializes them to send over a medium such as a wire or the airwaves. It also takes data in in serial form and assembles it into a parallel form to be used in the computer. Here is the Wikipedia article and here is ...


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I had a similar problem bringing a USB cellular modem online with consistent numbering in a system along with other USB tty devices vying for /dev/ttyUSB* numbers. In my case it was a EuroTech ReliaCELL 10-20-32 with the Telit chipset. I solved the problem using some ideas from here, ending up with the following excerpt in my .rules: SUBSYSTEMS=="usb", ...


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In addition to base_baud as mentioned in my other answer on this question, it may also be the order of arguments: (I didn't have time to experiment with different orders to see what exactly fixed it, as base_baud definitely worked) I ran into a similar set of issues trying to get new serial ports installed into an embedded x86 application. The issue for ...


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I know this question was posted in March 2011, but I encountered the same problem on Debian recently, but have found the relatively obscure cause/solution. As I'm sure you know, increasing the number of /dev/ttySX serial devices beyond the default of four (/dev/ttyS0 through ttyS3) is easiest done with a boot flag in grub (as changing the default requires ...


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The EOT character does not mark the end of a file. A file can contain arbitrary bytes. Typing Ctrl+D on a terminal makes the application think that the end of the file has come. The application does not read a Ctrl+D (EOT) character, it sees an end-of-file indication. The interpretation of Ctrl+D as end-of-input character is performed by the terminal driver ...


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The question already has an accepted answer, but I decided to share my variation of the solution provided by derobert. My requirements were slightly different - in addition to providing "incrementing" index numbers to new devices - I wanted reacquire index numbers that were given up by devices that have been removed from the system. The udev rule for ...


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You don't mention using a null modem with your serial cable, perhaps that is why you never see anything in the terminal. Since the device is booting, then U-boot is working properly. Your serial settings are correct as defined in to the release notes and the serial console instructions provided on the Toradex developer website. Ensure that you use a null ...


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You state that you have only 2 physical serial port which you detect to ttyS1 and ttyS2. ttyS3 and ttyS4 don't exist; they are exposed, but you have to ignore them. This is simply the way the driver works; it probes what may be a serial port and expose it to you, but you have to verify it is a real serial port because the driver can't be 100% sure. This ...


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Putty works well on Linux and offers some convenience, especially for serial communications. It has one drawback I haven't been able to directly solve: no copy-paste from the Putty window itself. The windows version has a lovely auto-copy to clipboard on highlight, right-click to paste behaviour (and there are excellent plugins for both chrome and firefox ...


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You say that you're trying to flash the NodeMCU firmware, but your example line shows you trying to upload a Lua source file. If you've already flashed the firmware, my best suggestion would be to try to install Minicom (sudo apt-get install minicom) and using that to confirm your connection in Ubuntu. Something like "sudo minicom -b 9600 -D /dev/ttyUSB0" ...



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