first version v_0.1 v0.1.0
authorFrantišek Kučera <>
Sat, 05 Nov 2016 17:32:57 +0100
changeset 06145d960b117
child 1 4950117e9c11
first version
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/bash/	Sat Nov 05 17:32:57 2016 +0100
     1.3 @@ -0,0 +1,108 @@
     1.4 +#!/bin/bash
     1.5 +
     1.6 +#
     1.7 +# Copyright © 2016 František Kučera (
     1.8 +#
     1.9 +# This program is free software: you can redistribute it and/or modify
    1.10 +# it under the terms of the GNU General Public License as published by
    1.11 +# the Free Software Foundation, either version 3 of the License, or
    1.12 +# (at your option) any later version.
    1.13 +#
    1.14 +# This program is distributed in the hope that it will be useful,
    1.15 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.17 +# GNU General Public License for more details.
    1.18 +#
    1.19 +# You should have received a copy of the GNU General Public License
    1.20 +# along with this program. If not, see <>.
    1.21 +
    1.22 +# is a set of functions for controlling GPIO pins of Raspberry Pi or similar computer
    1.23 +
    1.24 +_gpio_valid_port() {
    1.25 +	case $1 in 0|1|4|7|8|9|10|11|14|15|17|18|21|22|23|24|25)
    1.26 +		return 0;;
    1.27 +	*)
    1.28 +		return 1;;
    1.29 +	esac
    1.30 +}
    1.31 +
    1.32 +# export -f _gpio_valid_port
    1.33 +# seq 0 30 | xargs -n1 bash -c 'printf "%4s" "$0: "; _gpio_valid_port $0 ; if [ $? -eq 0 ]; then echo "valid port number"; else echo; fi'
    1.34 +
    1.35 +
    1.36 +_gpio_log_error() {
    1.37 +	# TODO: $(date --rfc-3339=seconds) or ● ?
    1.38 +	echo -e "\e[1;31m$1\e[0m"; > /dev/stderr;
    1.39 +}
    1.40 +
    1.41 +_gpio_log_warning() {
    1.42 +	echo -e "\e[2;33m$1 \e[0m"; > /dev/stderr;
    1.43 +}
    1.44 +
    1.45 +
    1.46 +# open (export) the port and set its direction
    1.47 +# parameters:
    1.48 +#	port number
    1.49 +#	direction: in/out
    1.50 +gpio_open() {
    1.51 +	local port="$1";
    1.52 +	local direction="$2";
    1.53 +	if [ $# -ne 2 ] || [[ "$direction" != @("in"|"out") ]]; then _gpio_log_error "usage: ${FUNCNAME[0]} <port> <in|out>"; return 1; fi
    1.54 +	if ! _gpio_valid_port "$port";                          then _gpio_log_error "invalid port number: $port";            return 1; fi;
    1.55 +	
    1.56 +	if [ -d  "/sys/class/gpio/gpio$port" ]; then 
    1.57 +		_gpio_log_warning "port $port is already exported → will just set direction: $direction";
    1.58 +	else
    1.59 +		echo "$port" > "/sys/class/gpio/export" || return 1;
    1.60 +	fi;
    1.61 +	
    1.62 +	echo "$direction" > "/sys/class/gpio/gpio$1/direction";
    1.63 +}
    1.64 +
    1.65 +
    1.66 +# close (unexport) the port and set its direction
    1.67 +# parameters:
    1.68 +#	port number
    1.69 +gpio_close() {
    1.70 +	local port="$1";
    1.71 +	if [ $# -ne 1 ];               then _gpio_log_error "usage: ${FUNCNAME[0]} <port>"; return 1; fi
    1.72 +	if ! _gpio_valid_port "$port"; then _gpio_log_error "invalid port number: $port";   return 1; fi;
    1.73 +	
    1.74 +	if [ -d  "/sys/class/gpio/gpio$port" ]; then 
    1.75 +		echo "$port" > "/sys/class/gpio/unexport";
    1.76 +	else
    1.77 +		_gpio_log_error "port $port is not open";
    1.78 +		return 1;
    1.79 +	fi;
    1.80 +}
    1.81 +
    1.82 +# reads value of given port
    1.83 +# parameters:
    1.84 +#	port number
    1.85 +gpio_read() {
    1.86 +	local port="$1";
    1.87 +	if [ $# -ne 1 ];               then _gpio_log_error "usage: ${FUNCNAME[0]} <port>"; return 1; fi
    1.88 +	if ! _gpio_valid_port "$port"; then _gpio_log_error "invalid port number: $port";   return 1; fi;
    1.89 +	
    1.90 +	if ! cat "/sys/class/gpio/gpio$port/value"; then
    1.91 +		_gpio_log_error "unable to read value of port $port";
    1.92 +		return 1;
    1.93 +	fi
    1.94 +}
    1.95 +
    1.96 +# writes the value to given port
    1.97 +# parameters:
    1.98 +#	port number
    1.99 +#	value: 0/1
   1.100 +gpio_write() {
   1.101 +	local port="$1";
   1.102 +	local value="$2";
   1.103 +	if [ $# -ne 2 ] || [[ "$value" != @("0"|"1") ]]; then _gpio_log_error "usage: ${FUNCNAME[0]} <port> <0|1>"; return 1; fi
   1.104 +	if ! _gpio_valid_port "$port";                          then _gpio_log_error "invalid port number: $port";  return 1; fi;
   1.105 +	
   1.106 +	if ! echo "$value" > "/sys/class/gpio/gpio$port/value"; then
   1.107 +		_gpio_log_error "unable to write value $value to port $port";
   1.108 +		return 1;
   1.109 +	fi
   1.110 +}
   1.111 +
     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/license/gpl.txt	Sat Nov 05 17:32:57 2016 +0100
     2.3 @@ -0,0 +1,674 @@
     2.4 +                    GNU GENERAL PUBLIC LICENSE
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   2.364 +  Notwithstanding any other provision of this License, for material you
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   2.368 +    a) Disclaiming warranty or limiting liability differently from the
   2.369 +    terms of sections 15 and 16 of this License; or
   2.370 +
   2.371 +    b) Requiring preservation of specified reasonable legal notices or
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   2.391 +  All other non-permissive additional terms are considered "further
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   2.393 +received it, or any part of it, contains a notice stating that it is
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   2.400 +
   2.401 +  If you add terms to a covered work in accord with this section, you
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   2.406 +  Additional terms, permissive or non-permissive, may be stated in the
   2.407 +form of a separately written license, or stated as exceptions;
   2.408 +the above requirements apply either way.
   2.409 +
   2.410 +  8. Termination.
   2.411 +
   2.412 +  You may not propagate or modify a covered work except as expressly
   2.413 +provided under this License.  Any attempt otherwise to propagate or
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   2.415 +this License (including any patent licenses granted under the third
   2.416 +paragraph of section 11).
   2.417 +
   2.418 +  However, if you cease all violation of this License, then your
   2.419 +license from a particular copyright holder is reinstated (a)
   2.420 +provisionally, unless and until the copyright holder explicitly and
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   2.424 +
   2.425 +  Moreover, your license from a particular copyright holder is
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   2.427 +violation by some reasonable means, this is the first time you have
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   2.430 +your receipt of the notice.
   2.431 +
   2.432 +  Termination of your rights under this section does not terminate the
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   2.435 +reinstated, you do not qualify to receive new licenses for the same
   2.436 +material under section 10.
   2.437 +
   2.438 +  9. Acceptance Not Required for Having Copies.
   2.439 +
   2.440 +  You are not required to accept this License in order to receive or
   2.441 +run a copy of the Program.  Ancillary propagation of a covered work
   2.442 +occurring solely as a consequence of using peer-to-peer transmission
   2.443 +to receive a copy likewise does not require acceptance.  However,
   2.444 +nothing other than this License grants you permission to propagate or
   2.445 +modify any covered work.  These actions infringe copyright if you do
   2.446 +not accept this License.  Therefore, by modifying or propagating a
   2.447 +covered work, you indicate your acceptance of this License to do so.
   2.448 +
   2.449 +  10. Automatic Licensing of Downstream Recipients.
   2.450 +
   2.451 +  Each time you convey a covered work, the recipient automatically
   2.452 +receives a license from the original licensors, to run, modify and
   2.453 +propagate that work, subject to this License.  You are not responsible
   2.454 +for enforcing compliance by third parties with this License.
   2.455 +
   2.456 +  An "entity transaction" is a transaction transferring control of an
   2.457 +organization, or substantially all assets of one, or subdividing an
   2.458 +organization, or merging organizations.  If propagation of a covered
   2.459 +work results from an entity transaction, each party to that
   2.460 +transaction who receives a copy of the work also receives whatever
   2.461 +licenses to the work the party's predecessor in interest had or could
   2.462 +give under the previous paragraph, plus a right to possession of the
   2.463 +Corresponding Source of the work from the predecessor in interest, if
   2.464 +the predecessor has it or can get it with reasonable efforts.
   2.465 +
   2.466 +  You may not impose any further restrictions on the exercise of the
   2.467 +rights granted or affirmed under this License.  For example, you may
   2.468 +not impose a license fee, royalty, or other charge for exercise of
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   2.470 +(including a cross-claim or counterclaim in a lawsuit) alleging that
   2.471 +any patent claim is infringed by making, using, selling, offering for
   2.472 +sale, or importing the Program or any portion of it.
   2.473 +
   2.474 +  11. Patents.
   2.475 +
   2.476 +  A "contributor" is a copyright holder who authorizes use under this
   2.477 +License of the Program or a work on which the Program is based.  The
   2.478 +work thus licensed is called the contributor's "contributor version".
   2.479 +
   2.480 +  A contributor's "essential patent claims" are all patent claims
   2.481 +owned or controlled by the contributor, whether already acquired or
   2.482 +hereafter acquired, that would be infringed by some manner, permitted
   2.483 +by this License, of making, using, or selling its contributor version,
   2.484 +but do not include claims that would be infringed only as a
   2.485 +consequence of further modification of the contributor version.  For
   2.486 +purposes of this definition, "control" includes the right to grant
   2.487 +patent sublicenses in a manner consistent with the requirements of
   2.488 +this License.
   2.489 +
   2.490 +  Each contributor grants you a non-exclusive, worldwide, royalty-free
   2.491 +patent license under the contributor's essential patent claims, to
   2.492 +make, use, sell, offer for sale, import and otherwise run, modify and
   2.493 +propagate the contents of its contributor version.
   2.494 +
   2.495 +  In the following three paragraphs, a "patent license" is any express
   2.496 +agreement or commitment, however denominated, not to enforce a patent
   2.497 +(such as an express permission to practice a patent or covenant not to
   2.498 +sue for patent infringement).  To "grant" such a patent license to a
   2.499 +party means to make such an agreement or commitment not to enforce a
   2.500 +patent against the party.
   2.501 +
   2.502 +  If you convey a covered work, knowingly relying on a patent license,
   2.503 +and the Corresponding Source of the work is not available for anyone
   2.504 +to copy, free of charge and under the terms of this License, through a
   2.505 +publicly available network server or other readily accessible means,
   2.506 +then you must either (1) cause the Corresponding Source to be so
   2.507 +available, or (2) arrange to deprive yourself of the benefit of the
   2.508 +patent license for this particular work, or (3) arrange, in a manner
   2.509 +consistent with the requirements of this License, to extend the patent
   2.510 +license to downstream recipients.  "Knowingly relying" means you have
   2.511 +actual knowledge that, but for the patent license, your conveying the
   2.512 +covered work in a country, or your recipient's use of the covered work
   2.513 +in a country, would infringe one or more identifiable patents in that
   2.514 +country that you have reason to believe are valid.
   2.515 +
   2.516 +  If, pursuant to or in connection with a single transaction or
   2.517 +arrangement, you convey, or propagate by procuring conveyance of, a
   2.518 +covered work, and grant a patent license to some of the parties
   2.519 +receiving the covered work authorizing them to use, propagate, modify
   2.520 +or convey a specific copy of the covered work, then the patent license
   2.521 +you grant is automatically extended to all recipients of the covered
   2.522 +work and works based on it.
   2.523 +
   2.524 +  A patent license is "discriminatory" if it does not include within
   2.525 +the scope of its coverage, prohibits the exercise of, or is
   2.526 +conditioned on the non-exercise of one or more of the rights that are
   2.527 +specifically granted under this License.  You may not convey a covered
   2.528 +work if you are a party to an arrangement with a third party that is
   2.529 +in the business of distributing software, under which you make payment
   2.530 +to the third party based on the extent of your activity of conveying
   2.531 +the work, and under which the third party grants, to any of the
   2.532 +parties who would receive the covered work from you, a discriminatory
   2.533 +patent license (a) in connection with copies of the covered work
   2.534 +conveyed by you (or copies made from those copies), or (b) primarily
   2.535 +for and in connection with specific products or compilations that
   2.536 +contain the covered work, unless you entered into that arrangement,
   2.537 +or that patent license was granted, prior to 28 March 2007.
   2.538 +
   2.539 +  Nothing in this License shall be construed as excluding or limiting
   2.540 +any implied license or other defenses to infringement that may
   2.541 +otherwise be available to you under applicable patent law.
   2.542 +
   2.543 +  12. No Surrender of Others' Freedom.
   2.544 +
   2.545 +  If conditions are imposed on you (whether by court order, agreement or
   2.546 +otherwise) that contradict the conditions of this License, they do not
   2.547 +excuse you from the conditions of this License.  If you cannot convey a
   2.548 +covered work so as to satisfy simultaneously your obligations under this
   2.549 +License and any other pertinent obligations, then as a consequence you may
   2.550 +not convey it at all.  For example, if you agree to terms that obligate you
   2.551 +to collect a royalty for further conveying from those to whom you convey
   2.552 +the Program, the only way you could satisfy both those terms and this
   2.553 +License would be to refrain entirely from conveying the Program.
   2.554 +
   2.555 +  13. Use with the GNU Affero General Public License.
   2.556 +
   2.557 +  Notwithstanding any other provision of this License, you have
   2.558 +permission to link or combine any covered work with a work licensed
   2.559 +under version 3 of the GNU Affero General Public License into a single
   2.560 +combined work, and to convey the resulting work.  The terms of this
   2.561 +License will continue to apply to the part which is the covered work,
   2.562 +but the special requirements of the GNU Affero General Public License,
   2.563 +section 13, concerning interaction through a network will apply to the
   2.564 +combination as such.
   2.565 +
   2.566 +  14. Revised Versions of this License.
   2.567 +
   2.568 +  The Free Software Foundation may publish revised and/or new versions of
   2.569 +the GNU General Public License from time to time.  Such new versions will
   2.570 +be similar in spirit to the present version, but may differ in detail to
   2.571 +address new problems or concerns.
   2.572 +
   2.573 +  Each version is given a distinguishing version number.  If the
   2.574 +Program specifies that a certain numbered version of the GNU General
   2.575 +Public License "or any later version" applies to it, you have the
   2.576 +option of following the terms and conditions either of that numbered
   2.577 +version or of any later version published by the Free Software
   2.578 +Foundation.  If the Program does not specify a version number of the
   2.579 +GNU General Public License, you may choose any version ever published
   2.580 +by the Free Software Foundation.
   2.581 +
   2.582 +  If the Program specifies that a proxy can decide which future
   2.583 +versions of the GNU General Public License can be used, that proxy's
   2.584 +public statement of acceptance of a version permanently authorizes you
   2.585 +to choose that version for the Program.
   2.586 +
   2.587 +  Later license versions may give you additional or different
   2.588 +permissions.  However, no additional obligations are imposed on any
   2.589 +author or copyright holder as a result of your choosing to follow a
   2.590 +later version.
   2.591 +
   2.592 +  15. Disclaimer of Warranty.
   2.593 +
   2.602 +
   2.603 +  16. Limitation of Liability.
   2.604 +
   2.613 +SUCH DAMAGES.
   2.614 +
   2.615 +  17. Interpretation of Sections 15 and 16.
   2.616 +
   2.617 +  If the disclaimer of warranty and limitation of liability provided
   2.618 +above cannot be given local legal effect according to their terms,
   2.619 +reviewing courts shall apply local law that most closely approximates
   2.620 +an absolute waiver of all civil liability in connection with the
   2.621 +Program, unless a warranty or assumption of liability accompanies a
   2.622 +copy of the Program in return for a fee.
   2.623 +
   2.624 +                     END OF TERMS AND CONDITIONS
   2.625 +
   2.626 +            How to Apply These Terms to Your New Programs
   2.627 +
   2.628 +  If you develop a new program, and you want it to be of the greatest
   2.629 +possible use to the public, the best way to achieve this is to make it
   2.630 +free software which everyone can redistribute and change under these terms.
   2.631 +
   2.632 +  To do so, attach the following notices to the program.  It is safest
   2.633 +to attach them to the start of each source file to most effectively
   2.634 +state the exclusion of warranty; and each file should have at least
   2.635 +the "copyright" line and a pointer to where the full notice is found.
   2.636 +
   2.637 +    <one line to give the program's name and a brief idea of what it does.>
   2.638 +    Copyright (C) <year>  <name of author>
   2.639 +
   2.640 +    This program is free software: you can redistribute it and/or modify
   2.641 +    it under the terms of the GNU General Public License as published by
   2.642 +    the Free Software Foundation, either version 3 of the License, or
   2.643 +    (at your option) any later version.
   2.644 +
   2.645 +    This program is distributed in the hope that it will be useful,
   2.646 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
   2.648 +    GNU General Public License for more details.
   2.649 +
   2.650 +    You should have received a copy of the GNU General Public License
   2.651 +    along with this program.  If not, see <>.
   2.652 +
   2.653 +Also add information on how to contact you by electronic and paper mail.
   2.654 +
   2.655 +  If the program does terminal interaction, make it output a short
   2.656 +notice like this when it starts in an interactive mode:
   2.657 +
   2.658 +    <program>  Copyright (C) <year>  <name of author>
   2.659 +    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
   2.660 +    This is free software, and you are welcome to redistribute it
   2.661 +    under certain conditions; type `show c' for details.
   2.662 +
   2.663 +The hypothetical commands `show w' and `show c' should show the appropriate
   2.664 +parts of the General Public License.  Of course, your program's commands
   2.665 +might be different; for a GUI interface, you would use an "about box".
   2.666 +
   2.667 +  You should also get your employer (if you work as a programmer) or school,
   2.668 +if any, to sign a "copyright disclaimer" for the program, if necessary.
   2.669 +For more information on this, and how to apply and follow the GNU GPL, see
   2.670 +<>.
   2.671 +
   2.672 +  The GNU General Public License does not permit incorporating your program
   2.673 +into proprietary programs.  If your program is a subroutine library, you
   2.674 +may consider it more useful to permit linking proprietary applications with
   2.675 +the library.  If this is what you want to do, use the GNU Lesser General
   2.676 +Public License instead of this License.  But first, please read
   2.677 +<>.