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I have a Raspberry Pi with Bluetooth using the /dev/ttyAMA0 and a UART using /dev/ttyS0. Is it also possible to use the USB as another UART? Are pins 14 and 15 tied to the USB as well?

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    Does this answer your question? How to enable both UART (ttyS0 and ttyAMA0) on Raspberry Pi 3b?
    – Milliways
    Commented Apr 26 at 23:00
  • I would like ttyAMA0, ttyS0, and the USB port, but I am not sure if the ttyS0 is the same as the USB port
    – CrabbyPete
    Commented Apr 27 at 0:05
  • Your question is ambiguous. Do you have a USB serial dongle? How is it connected? If in Pi USB it will probably be /dev/ttyAMA0. /dev/ttyS0 is the mini UART on the SoC normally on GPIO 14, 15.
    – Milliways
    Commented Apr 27 at 1:13
  • I want /dev/ttyAMA0 the bluetooth device, /dev/ttyS0, the minor UART, and somethng line /dev/ACM0 or /dev/USB0 in which the USB acts as another serial port
    – CrabbyPete
    Commented Apr 28 at 21:32

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The USB is not tied to Pins 14 or 15. The USB becomes what it plugged to it. A card reader with a SD Card becomes a USB Disk. A Raspberry Pi Pico becomes a TTY Device (/dev/ttyACM0). As Milliways suggested, a USB Serial Dongle becomes a TTY device.

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