USB to serial adapter tools

Tools for finding connected USB to serial adapter devices.

Usage

./list-ttys.sh

List all currently connected USB to serial adapters by searching through /sys/bus/usb/devices/.

./find-tty.sh [serial_regex1] [serial_regex2] ... [serial_regexZ]

Write to stdout all ttys connected to the chosen programmer. serial_regexN are extended regular expressions (as understood by egrep) containing a pattern matched against the USB device serial number. Each of the given expressions are tested, against each serial number, and matching ttys are output (one tty per line).

In order to search for an exact match against the device serial, use '^{serialnumber$'} as the pattern. If no pattern is given, find-tty.sh returns all found USB ttys (in an arbitrary order, this is not guaranteed to be the /dev/ttyUSBX with the lowest number).

Serial strings from all connected USB ttys can be found from the list generated by list-ttys.sh.

Exit codes

find-tty.sh returns 0 if a match is found, 1 otherwise.

Makefile example usage

The script find-tty.sh is designed for use from within a board Makefile.include. An example section is shown below (for an OpenOCD based solution):

# Add serial matching command
ifneq ($(PROGRAMMER_SERIAL),)
  OOCD_BOARD_FLAGS += -c 'ftdi_serial $(PROGRAMMER_SERIAL)'

  ifeq ($(PORT),)
    # try to find tty name by serial number, only works on Linux currently.
    ifeq ($(OS),Linux)
      PORT := $(firstword $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh "^$(PROGRAMMER_SERIAL)$$"))
    endif
  endif
endif

# Fallback PORT if no serial was specified or if the specified serial was not found
ifeq ($(PORT),)
    ifeq ($(OS),Linux)
      PORT := $(firstword $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh))
    else ifeq ($(OS),Darwin)
      PORT := $(shell ls -1 /dev/tty.SLAB_USBtoUART* | head -n 1)
    endif
endif

# TODO: add support for windows as host platform
ifeq ($(PORT),)
  $(info CAUTION: No terminal port for your host system found!)
endif
export PORT

Limitations

Only tested on Linux, and probably only works on Linux.