Initial commit
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build/
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cmake_minimum_required(VERSION 3.16)
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project(relaycontrol LANGUAGES C)
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set(CFLAGS "${CFLAGS} -Wall -Wextra -pedantic -Wformat-overflow=2 -Wformat-security -Winit-self -Wstrict-overflow=2 -Wstringop-overflow=2 -Walloc-zero -Wduplicated-branches -Wduplicated-cond -Wtrampolines -Wfloat-equal -Wshadow -Wunsafe-loop-optimizations -Wparentheses -fanalyzer -fstack-protector")
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if (NOT CMAKE_BUILD_TYPE)
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set(CMAKE_BUILD_TYPE Debug)
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endif()
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if (CMAKE_BUILD_TYPE EQUAL "Debug")
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set(CFLAGS "${CFLAGS} -Og")
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elseif (CMAKE_BUILD_TYPE EQUAL "Release")
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set(CFLAGS "${CFLAGS} -O2 -Werror")
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endif()
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add_executable(relaycntl
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src/main.c
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)
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set_property(TARGET relaycntl PROPERTY C_STANDARD 99)
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install(TARGETS relaycntl RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
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DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
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Version 2, December 2004
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Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
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Everyone is permitted to copy and distribute verbatim or modified
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copies of this license document, and changing it is allowed as long
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as the name is changed.
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DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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0. You just DO WHAT THE FUCK YOU WANT TO.
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# Raspberry PI General Purpose Input/Output Controller
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This is a simple GPIO pin controller for UNIX-like kernels/systems.
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## Requirements
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- CMake
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- ANSI C compiler
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- UNIX standard library
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## Building
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First, generate the build files with CMake:
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```
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cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Release
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```
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Second, install the binary:
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```
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cd build/
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sudo make install
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```
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## License
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WTFPL
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#define GPIO_IFACE_MISSING = -1
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#define GPIO_PIN_EXP_FAIL = -2
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#define GPIO_DIR_CONT_FAIL = -3
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#define GPIO_SWITCH_FAIL = -4
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#define GPIO_PIN_UNX_NF = -5
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#define GPIO_PIN_UNX_FAIL = -6
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#define GPIO_PREFIX "/sys/class/gpio/"
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#define GPIO_EXPORT "export"
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#define GPIO_UNEXPORT "unexport"
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#define MAX_PATHLEN 512
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#define PRINTERRANDRET(mesg, varfmt, var) \
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{ \
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fprintf(stderr, "%s \"%" varfmt "\". %s (%i)\n", mesg, var, strerror(errno), errno); \
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return 1; \
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}
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ssize_t exportPin(signed int pinno);
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ssize_t setPinDirection(signed int pinno, char* value);
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ssize_t setPinValue(signed int pinno, int value);
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int main(int argc, char* argv[])
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{
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int pinno = (argc > 1) ? atoi(argv[1]) : 0;
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bool value = (argc > 2) ? atoi(argv[2]) : 0;
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if (pinno != exportPin(pinno))
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return -1;
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if (pinno != setPinDirection(pinno, "out"))
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return -1;
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if (pinno != setPinValue(pinno, value))
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return -1;
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return 0;
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}
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ssize_t exportPin(signed int pinno)
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{
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if (chdir(GPIO_PREFIX) != 0)
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PRINTERRANDRET("Failed to change directory to", "s", GPIO_PREFIX);
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char buffer[MAX_PATHLEN];
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int fd;
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ssize_t nbytes;
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if ((fd = open(GPIO_EXPORT, O_WRONLY)) < 0)
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PRINTERRANDRET("Failed to open export", "s", GPIO_EXPORT);
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if ((nbytes = snprintf(buffer, MAX_PATHLEN, "%i", pinno)) <= 0)
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PRINTERRANDRET("Couldn't format pin number as string", "i", pinno);
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if (write(fd, buffer, nbytes) != nbytes && errno != EBUSY)
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PRINTERRANDRET("Couldn't write pin number to the exporter", "i", pinno);
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if (close(fd) != 0)
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PRINTERRANDRET("Couldn't close exporter", "i", pinno);
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return pinno;
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}
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ssize_t setPinDirection(signed int pinno, char* value)
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{
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if (chdir(GPIO_PREFIX) != 0)
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PRINTERRANDRET("Failed to change directory to", "s", GPIO_PREFIX);
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char buffer[MAX_PATHLEN];
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int fd;
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ssize_t nbytes;
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if ((nbytes = snprintf(buffer, MAX_PATHLEN, "gpio%i/direction", pinno)) <= 0)
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PRINTERRANDRET("Couldn't format pin path as string", "i", pinno);
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if ((fd = open(buffer, O_WRONLY)) < 0)
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PRINTERRANDRET("Failed to open pin path.", "s", GPIO_EXPORT);
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if (write(fd, value, strlen(value)) != nbytes && errno != EBUSY)
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PRINTERRANDRET("Couldn't write pin direction", "i", pinno);
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if (close(fd) != 0)
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PRINTERRANDRET("Couldn't close pin direction file", "i", pinno);
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return pinno;
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}
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ssize_t setPinValue(signed int pinno, int value)
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{
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if (chdir(GPIO_PREFIX) != 0)
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PRINTERRANDRET("Failed to change directory to", "s", GPIO_PREFIX);
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char buffer[MAX_PATHLEN];
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int fd;
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ssize_t nbytes;
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if ((nbytes = snprintf(buffer, MAX_PATHLEN, "gpio%i/value", pinno)) <= 0)
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PRINTERRANDRET("Couldn't format pin path as string", "i", pinno);
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if ((fd = open(buffer, O_WRONLY)) < 0)
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PRINTERRANDRET("Failed to open pin path.", "s", GPIO_EXPORT);
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if ((nbytes = snprintf(buffer, MAX_PATHLEN, "%i", value)) <= 0)
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PRINTERRANDRET("Couldn't format pin value as string", "i", value);
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if (write(fd, buffer, nbytes) != nbytes && errno != EBUSY)
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PRINTERRANDRET("Couldn't write pin value", "i", pinno);
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if (close(fd) != 0)
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PRINTERRANDRET("Couldn't close pin value file", "i", pinno);
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return pinno;
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}
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import time
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import sys
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import errno
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GPIO_IFACE_MISSING = -1
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GPIO_PIN_EXP_FAIL = -2
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GPIO_DIR_CONT_FAIL = -3
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GPIO_SWITCH_FAIL = -4
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GPIO_PIN_UNX_NF = -5
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GPIO_PIN_UNX_FAIL = -6
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PINLISTMISS = -1
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PINLISTTOKFAIL = -2
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def preparePin(pinno):
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try: x = open('/sys/class/gpio/export', 'w')
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except:
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return GPIO_IFACE_MISSING
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else:
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try:
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x.write(f'{pinno}')
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x.close()
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except OSError as e:
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if (e.errno != errno.EBUSY): # Busy devices are already exported
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return GPIO_PIN_EXP_FAIL
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return
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for i in range(0,5):
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try: g = open(f'/sys/class/gpio/gpio{pinno}/direction', 'w')
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except:
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if (i == 4):
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return GPIO_DIR_CONT_FAIL
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else: time.sleep(1)
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else:
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try: g.write('out')
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except:
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g.close()
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return GPIO_SWITCH_FAIL
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else:
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g.close()
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break
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def closePin(pinno):
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try: x = open('/sys/class/gpio/unexport', 'w')
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except: return GPIO_PIN_UNX_NF
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else:
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try: x.write(pinno)
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except: return GPIO_PIN_UNX_FAIL
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finally: x.close()
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try: preparePin(sys.argv[1])
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except GPIO_SWITCH_FAIL: print(f'GPIO Pin direction couldn\'t be switched to out. {sys.argv[1]}')
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except GPIO_DIR_CONT_FAIL: print(f'GPIO Pin control couldn\'t be opened. {sys.argv[1]}')
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except GPIO_PIN_EXP_FAIL: print(f'GPIO Pin couldn\'t be exported. P: {sys.argv[1]}')
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except GPIO_IFACE_MISSING: print(f'GPIO Export interface couldn\'t be opened. {sys.argv[1]}')
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with open(f'/sys/class/gpio/gpio{sys.argv[1]}/value', 'w') as x:
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if (len(sys.argv) == 3): x.write(sys.argv[2])
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else: x.write('0')
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