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ssterm is a simple console-based serial port terminal.

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Octocat-spinner-32 COPYING
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Octocat-spinner-32 README.md
Octocat-spinner-32 ssterm.py
README.md

ABOUT ssterm

ssterm is a simple console-based serial port terminal. It features painless serial port configuration, no dependencies outside of a standard Python 2 installation, a variety of useful input/output features:

  • plain ASCII representation
  • split hexadecimal/ASCII representation
  • pure hexadecimal representation with optional newline interpretation
  • color coding bytes in all three ASCII, split, and hexadecimal modes
  • raw terminal with control character forwarding
  • transmit newline character remapping (e.g. LF -> CRLF)
  • receive newline character remapping (e.g. CR -> LF)
  • local character echo

ssterm is written in Python 2, and should work on most *nix platforms. It works with both CPython and pypy implementations of Python. Feel free to send any bugs, ideas, or suggestions to vsergeev at gmail or the GitHub issues page.

USAGE

Usage: ssterm [options] <serial port>

ssterm - simple serial-port terminal
Written by Vanya A. Sergeev - <vsergeev@gmail.com>.

 Serial Port Options:
  -b, --baudrate <rate>         Specify baudrate (e.g., 9600, 115200, etc.)
  -d, --databits <number>       Specify number of data bits [5,6,7,8]
  -p, --parity <type>           Specify parity [none, odd, even]
  -t, --stopbits <number>       Specify number of stop bits [1,2]
  -f, --flow-control <type>     Specify flow-control [none, rtscts, xonxoff]

 Formatting Options:
  -s, --split                   Split hexadecimal/ASCII mode

  --split-full                  Split hexadecimal/ASCII mode with full lines
                                  (better for piping than --split)

  -x, --hex                     Hexadecimal mode

  --hex-nl                      Hexadecimal mode with newline interpretation\n\

  -c, --color <list>            Specify comma-delimited list of characters in
                                  ASCII or hex to color code: A,$,0x0d,0x0a,...

  --tx-nl <substitution>        Specify the transmit newline substitution
                                  [raw, none, cr, lf, crlf]
  --rx-nl <match>               Specify the receive newline match
                                  [raw, cr, lf, crlf, crorlf]

  -e, --echo                    Turn on local character echo

  -h, --help                    Display this usage/help
  -v, --version                 Display the program's version


Quit Escape Character:          Ctrl-]

Color Code Sequence (fg/bg):
 Black/Red, Black/Green, Black/Yellow, White/Blue, White/Magenta,
 Black/Cyan, Black/White

Default Options:
 baudrate: 115200 | databits: 8 | parity: none | stopbits: 1 | flow ctrl: none
 tx newline: raw | rx newline: raw | local echo: off
 split mode: off | hex mode: off   | color code: off

LICENSE

ssterm is released under the GNU General Public License Version 3.

You should have received a copy of the GNU General Public License
along with this program; see the file "COPYING".  If not, see
<http://www.gnu.org/licenses/>.

USING ssterm

By default, ssterm will open the specified serial port with 115200 baudrate, 8 data bits, no parity, 1 stop bit, and no flow control. These settings can be adjusted with the -b / --baudrate, -d / --databits, -p / --parity, -t / --stopbits, and -f / --flow-control options (see usage below).

ssterm opens the input terminal in raw mode, so all characters and control signals are passed through transparently to the serial port. This enables interacting with terminal interfaces over the serial port that interpret control characters, such as a Linux termios on an embedded system. The only exception is Ctrl-], which serves as ssterm's quit escape character.

ssterm can display output in split hexadecimal/ASCII mode, with the -s or --split option. This mode will format data in the split mode as it is received, updating the hexadecimal and ASCII columns by clearing and re-drawing the line until it is full width. For a split hexadecimal/ASCII representation suitable for piping to another program or file, --split-full should be used, to print full column width data without re-drawing.

ssterm can color code particular characters, specified by a comma-delimited list with the -c or --color option. The list can contain ASCII entries (e.g. a,_,A,...), as well as hexadecimal entries (e.g. 0x0a,0xff,...). There is currently a maximum of seven distinct colors, assigned sequentially to the specified characters in the following order (foreground/background): Black/Red, Black/Green, Black/Yellow, White/Blue, White/Magenta, Black/Cyan, Black/White.

ssterm can also display output in pure hexadecimal mode, with the -x or --hex option, and interpret newlines in this mode with the --hex-nl option.

Plain ASCII representation mode is default.

The newline characters can be remapped upon transmission and remapped upon reception. These mappings are specified with the --tx-nl and --rx-nl options. These options were created to accommodate working with the serial port on LF based systems, but the functionality should extend to CR and CRLF based systems as well. The substitution and matching can be disabled by selecting 'raw' mode for both --tx-nl and --rx-nl options.

The following receive newline character remappings are available:

  • raw - no remapping of received newline characters
  • cr - map received CR to platform newline
  • lf - map received LF to platform newline
  • crlf - map received CRLF to platform newline
  • crorlf - map any received CR or LF to platform newline

The following transmit newline character remappings are available:

  • raw - no remapping of transmit newline characters
  • none - omit newline characters on transmit
  • cr - map platform newline to CR on transmit
  • lf - map platform newline to LF on transmit
  • crlf - map platform newline to CRLF on transmit

The default receive newline character mapping (--rx-nl option) is raw. The default transmit newline character mapping (--tx-nl option) is raw.

Other options include local character echo, which is off by default.

Example Usage

Typical usage with defaults (115200 8N1, no flow control):

$ ssterm /dev/ttyUSB0

Logging some data:

$ ssterm /dev/ttyUSB0 > nmea_data.txt

Viewing and logging some data, with the help of tee:

$ ssterm /dev/ttyUSB0 | tee nmea_data.txt

Specific serial port settings (115200 baudrate, odd parity, 2 stop bits), and the default 8 data bits:

$ ssterm -b 115200 -p odd -t 2 /dev/ttyUSB0

CRLF for transmitted newlines, but LF for received newlines:

$ ssterm --tx-nl crlf --rx-nl lf /dev/ttyUSB0

Split representation mode:

$ ssterm -s /dev/ttyUSB0
4c 6f 72 65 6d 20 69 70  73 75 6d 20 64 6f 6c 6f  |Lorem ipsum dolo|
72 20 73 69 74 20 61 6d  65 74 2c 20 63 6f 6e 73  |r sit amet, cons|
65 63 74 65 74 75 72 20  61 64 69 70 69 73 69 63  |ectetur adipisic|
69 6e 67 20 65 6c 69 74  2c 20 73 65 64 20 64 6f  |ing elit, sed do|
20 65 69 75 73 6d 6f 64  20 74 65 6d 70 6f 72 20  | eiusmod tempor |
69 6e 63 69 64 69 64 75  6e 74 20 75 74 20 6c 61  |incididunt ut la|
62 6f 72 65 20 65 74 20  64 6f 6c 6f 72 65 20 6d  |bore et dolore m|
61 67 6e 61 20 61 6c 69  71 75 61 2e 0a 55 74 20  |agna aliqua..Ut |
65 6e 69 6d 20 61 64 20  6d 69 6e 69 6d 20 76 65  |enim ad minim ve|
6e 69 61 6d 2c 20 71 75  69 73 20 6e 6f 73 74 72  |niam, quis nostr|
75 64 20 65 78 65 72 63  69 74 61 74 69 6f 6e 20  |ud exercitation |
75 6c 6c 61 6d 63 6f 20  6c 61 62 6f 72 69 73 20  |ullamco laboris |
6e 69 73 69 20 75 74 20  61 6c 69 71 75 69 70 20  |nisi ut aliquip |
65 78 20 65 61 20 63 6f  6d 6d 6f 64 6f 20 63 6f  |ex ea commodo co|
6e 73 65 71 75 61 74 2e  0a 44 75 69 73 20 61 75  |nsequat..Duis au|
74 65 20 69 72 75 72 65  20 64 6f 6c 6f 72 20 69  |te irure dolor i|
6e 20 72 65 70 72 65 68  65 6e 64 65 72 69 74 20  |n reprehenderit |
69 6e 20 76 6f 6c 75 70  74 61 74 65 20 76 65 6c  |in voluptate vel|
69 74 20 65 73 73 65 20  63 69 6c 6c 75 6d 20 64  |it esse cillum d|
6f 6c 6f 72 65 20 65 75  20 66 75 67 69 61 74 20  |olore eu fugiat |
6e 75 6c 6c 61 20 70 61  72 69 61 74 75 72 2e 0a  |nulla pariatur..|
45 78 63 65 70 74 65 75  72 20 73 69 6e 74 20 6f  |Excepteur sint o|
63 63 61 65 63 61 74 20  63 75 70 69 64 61 74 61  |ccaecat cupidata|
74 20 6e 6f 6e 20 70 72  6f 69 64 65 6e 74 2c 20  |t non proident, |
73 75 6e 74 20 69 6e 20  63 75 6c 70 61 20 71 75  |sunt in culpa qu|
69 20 6f 66 66 69 63 69  61 20 64 65 73 65 72 75  |i officia deseru|
6e 74 20 6d 6f 6c 6c 69  74 20 61 6e 69 6d 20 69  |nt mollit anim i|
64 20 65 73 74 20 6c 61  62 6f 72 75 6d 2e 0a 00  |d est laborum...|
01 02 03 04 05 06 07 08  09 0a 0b 0c 0d 0e 0f 10  |................|
11 12 13 14 15 16 17 18  19 1a 1b 1c 1d 1e 1f 20  |............... |
21 22 23 24 25 26 27 28  29 2a 2b 2c 2d 2e 2f 30  |!"#$%&'()*+,-./0|
31 32 33 34 35 36 37 38  39 3a 3b 3c 3d 3e 3f 40  |123456789:;<=>?@|
41 42 43 44 45 46 47 48  49 4a 4b 4c 4d 4e 4f 50  |ABCDEFGHIJKLMNOP|
51 52 53 54 55 56 57 58  59 5a 5b 5c 5d 5e 5f 60  |QRSTUVWXYZ[\]^_`|
61 62 63 64 65 66 67 68  69 6a 6b 6c 6d 6e 6f 70  |abcdefghijklmnop|
71 72 73 74 75 76 77 78  79 7a 7b 7c 7d 7e 7f 80  |qrstuvwxyz{|}~..|
81 82 83 84 85 86 87 88  89 8a 8b 8c 8d 8e 8f 90  |................|
91 92 93 94 95 96 97 98  99 9a 9b 9c 9d 9e 9f a0  |................|
a1 a2 a3 a4 a5 a6 a7 a8  a9 aa ab ac ad ae af b0  |................|
b1 b2 b3 b4 b5 b6 b7 b8  b9 ba bb bc bd be bf c0  |................|
c1 c2 c3 c4 c5 c6 c7 c8  c9 ca cb cc cd ce cf d0  |................|
d1 d2 d3 d4 d5 d6 d7 d8  d9 da db dc dd de df e0  |................|
e1 e2 e3 e4 e5 e6 e7 e8  e9 ea eb ec ed ee ef f0  |................|
f1 f2 f3 f4 f5 f6 f7 f8  f9 fa fb fc fd fe ff     |...............|

Split representation mode with character color coding:

$ ssterm -s -c 0x0A,{,g,0xAE /dev/ttyUSB0

Hexadecimal representation mode:

$ ssterm -x /dev/ttyUSB0
24 47 50 47 47 41 2c 30  38 32 38 33 30 2e 38 32
31 2c 2c 2c 2c 2c 30 2c  30 30 2c 2c 2c 4d 2c 30
2e 30 2c 4d 2c 2c 30 30  30 30 2a 35 43 0d 0a 24
47 50 47 53 41 2c 41 2c  31 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c  2a 31 45 0d 0a 24 47 50
52 4d 43 2c 30 38 32 38  33 30 2e 38 32 31 2c 56
2c 2c 2c 2c 2c 2c 2c 32  36 31 30 30 39 2c 2c 2a
32 39 0d 0a 24 47 50 47  47 41 2c 30 38 32 38 33
31 2e 38 31 34 2c 2c 2c  2c 2c 30 2c 30 30 2c 2c
2c 4d 2c 30 2e 30 2c 4d  2c 2c 30 30 30 30 2a 35
42 0d 0a 24 47 50 47 53  41 2c 41 2c 31 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c  2c 2c 2c 2c 2a 31 45 0d
0a 24 47 50 52 4d 43 2c  30 38 32 38 33 31 2e 38
31 34 2c 56 2c 2c 2c 2c  2c 2c 2c 32 36 31 30 30
39 2c 2c 2a 32 45 0d 0a  24 47 50 47 47 41 2c 30
38 

Hexadecimal representation mode, with newline interpretation and character color coding:

$ ssterm -x --hex-nl -c $,0x0a,0x0d /dev/ttyUSB0
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