1.1 --- a/bash/gpio.sh Sat Nov 05 17:34:34 2016 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,108 +0,0 @@
1.4 -#!/bin/bash
1.5 -
1.6 -# GPIO.sh
1.7 -# Copyright © 2016 František Kučera (frantovo.cz)
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
1.16 -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 <http://www.gnu.org/licenses/>.
1.21 -
1.22 -# GPIO.sh 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 -