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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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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