maxim/gpio-reader
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
b2af17eea92238fa99dae5bf174b3cdf81b78656
gpio-reader/gpio/gpio.c
Connor Gibson b86be0969d Remove extra indents before if followed by if else 
This was driving clangd crazy - replaced with indents between the if and conditional parentheses in most places.
2025-06-05 22:16:43 -07:00

1226 lines
31 KiB
C
Raw Blame History

/*
* gpio.c:
* Swiss-Army-Knife, Set-UID command-line interface to the Raspberry
* Pi's GPIO.
* Copyright (c) 2012-2025 Gordon Henderson and contributors
***********************************************************************
* This file is part of wiringPi:
* https://github.com/WiringPi/WiringPi/
*
* wiringPi is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* wiringPi is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <wiringPi.h>
#include <wpiExtensions.h>
#include <gertboard.h>
#include <piFace.h>
#include "../version.h"
extern int wiringPiDebug ;
int gpioDebug ;
// External functions I can't be bothered creating a separate .h file for:
extern void doReadall (void) ;
extern void doAllReadall (void) ;
extern void doQmode (int argc, char *argv []) ;
#ifndef TRUE
# define TRUE (1==1)
# define FALSE (1==2)
#endif
#define PI_USB_POWER_CONTROL 38
#define I2CDETECT "i2cdetect"
#define MODPROBE "modprobe"
#define RMMOD "rmmod"
int wpMode ;
char *usage = "Usage: gpio -v\n"
" gpio -h\n"
" gpio [-g|-1] ...\n"
" where -g: pin numbering according to readall BCM column\n"
" where -1: pin numbering according to readall Physical column\n"
" when omitted: pin numbering according to readall wPi column\n"
" gpio [-d] ...\n"
" [-x extension:params] [[ -x ...]] ...\n"
" gpio [-p] <read/write/wb> ...\n"
" gpio <mode/read/write/aread/awritewb/pwm/pwmTone/clock> ...\n"
" gpio <toggle/blink> <pin>\n"
" gpio readall\n"
" gpio wfi <pin> <mode>\n"
" where <mode> can be: rising, falling, both\n"
" gpio drive <group> <value>\n"
" gpio pwm-bal/pwm-ms \n"
" gpio pwmr <range> \n"
" gpio pwmc <divider> \n"
" gpio i2cd/i2cdetect\n"
" gpio rbx/rbd\n"
" gpio wb <value>\n"
" gpio usbp high/low\n"
" gpio gbr <channel>\n"
" gpio gbw <channel> <value>" ; // No trailing newline needed here.
#ifdef NOT_FOR_NOW
/*
* decodePin:
* Decode a pin "number" which can actually be a pin name to represent
* one of the Pi's on-board pins.
*********************************************************************************
*/
static int decodePin (const char *str)
{
// The first case - see if it's a number:
if (isdigit (str [0]))
return atoi (str) ;
return 0 ;
}
#endif
/*
* doI2Cdetect:
* Run the i2cdetect command with the right runes for this Pi revision
*********************************************************************************
*/
static void doI2Cdetect (const char *progName)
{
int port = piGpioLayout () == GPIO_LAYOUT_PI1_REV1 ? 0 : 1 ;
char command[64];
snprintf(command, 64, "i2cdetect -y %d", port);
int ret = system(command);
if (ret < 0) {
fprintf (stderr, "%s: Unable to run i2cdetect: %s\n", progName, strerror(errno));
}
if (0x7F00 == (ret & 0xFF00)) {
fprintf (stderr, "%s: i2cdetect not found, please install i2c-tools\n", progName);
}
}
void SYSFS_DEPRECATED(const char *progName) {
fprintf(stderr, "%s: GPIO Sysfs Interface for Userspace is deprecated (https://www.kernel.org/doc/Documentation/gpio/sysfs.txt).\n Function is now useless and empty.\n\n", progName);
}
void LOAD_DEPRECATED(const char *progName) {
fprintf(stderr, "%s: load/unload modules is deprecated. You need to run the raspi-config program (as root) and select the interface option (SPI or I2C) that you wish to de-/activate.\n\n", progName);
}
/*
* doExports: -> deprecated, removed
* List all GPIO exports
*********************************************************************************
*/
/*
* doExport: -> deprecated, removed
* gpio export pin mode
* This uses the /sys/class/gpio device interface.
*********************************************************************************
*/
/*
* doWfi:
* gpio wfi pin mode
* Wait for Interrupt on a given pin.
* Slight cheat here - it's easier to actually use ISR now (which calls
* gpio to set the pin modes!) then we simply sleep, and expect the thread
* to exit the program. Crude but effective.
*********************************************************************************
*/
static volatile int globalIterations ;
static volatile int globalCounter ;
void printgpioflush(const char* text) {
if (gpioDebug) {
printf("%s", text);
fflush(stdout);
}
}
void printgpio(const char* text) {
if (gpioDebug) {
printf("%s", text);
}
}
static void wfi (void) {
globalCounter++;
if(globalCounter>=globalIterations) {
printgpio("finished\n");
exit(0);
} else {
printgpioflush("I");
}
}
static void wfi2(struct WPIWfiStatus wfiStatus, void* userdata) {
(void)wfiStatus;
(void)userdata;
globalCounter++;
if (globalCounter>=globalIterations) {
switch(wfiStatus.edge) {
case INT_EDGE_FALLING:
printgpio("finished falling\n");
break;
case INT_EDGE_RISING:
printgpio("finished rising\n");
break;
default:
printgpio("finished\n");
break;
}
exit(wfiStatus.edge);
} else {
printgpioflush("I");
}
}
int get_wfi_edge(const char* arg_cmd, const char* arg_mode, int exitcode) {
if (strcasecmp (arg_mode, "rising") == 0) {
return INT_EDGE_RISING ;
} else if (strcasecmp (arg_mode, "falling") == 0) {
return INT_EDGE_FALLING ;
} else if (strcasecmp (arg_mode, "both") == 0) {
return INT_EDGE_BOTH ;
} else {
fprintf (stderr, "%s: wfi: Invalid mode: %s. Should be rising, falling or both\n", arg_cmd, arg_mode) ;
exit(exitcode);
}
}
void doWfiInternal(const char* cmd, int pin, int mode, int interations, int timeoutSec, int debounce) {
globalIterations = interations;
globalCounter = 0;
if (debounce>=0) {
// V2 function
if (wiringPiISR2(pin, mode, &wfi2, debounce, NULL) < 0) {
fprintf (stderr, "%s: Unable to setup ISR2: %s\n", cmd, strerror (errno));
exit(1);
}
} else {
// classic function
if (wiringPiISR(pin, mode, &wfi) < 0) {
fprintf (stderr, "%s: Unable to setup ISR: %s\n", cmd, strerror (errno));
exit(1);
}
}
printgpio("wait for interrupt function call\n");
for (int Sec=0; Sec<timeoutSec; ++Sec) {
printgpioflush(".");
delay(999);
}
printgpio("\nstopping wait for interrupt\n");
wiringPiISRStop(pin);
}
void doWfi(int argc, char *argv [])
{
int pin, mode, interations=1;
int timeoutSec = 2147483647;
if (argc != 4 && argc != 5 && argc != 6) {
fprintf (stderr, "Usage: %s wfi pin mode [interations] [timeout sec.]\n", argv [0]) ;
exit(1);
}
pin = atoi (argv[2]) ;
mode = get_wfi_edge(argv[1], argv[3], 1);
if (argc>=5) {
interations = atoi(argv[4]);
}
if (argc>=6) {
timeoutSec = atoi(argv[5]);
}
doWfiInternal(argv[1], pin, mode, interations, timeoutSec, -1);
}
void doWfi2(int argc, char *argv [])
{
int pin, mode, interations=1, debounce=50000;
int timeoutSec = 2147483647;
if (argc != 4 && argc != 5 && argc != 6 && argc != 7) {
fprintf (stderr, "Usage: %s wfis pin mode [debounce period microsec.] [interations] [timeout sec.]\n", argv [0]);
exit(-2);
}
pin = atoi (argv[2]) ;
mode = get_wfi_edge(argv[1], argv[3], -1);
if (argc>=5) {
debounce = atoi(argv[4]);
}
if (argc>=6) {
interations = atoi(argv[5]);
}
if (argc>=7) {
timeoutSec = atoi(argv[6]);
}
if (timeoutSec<0 || interations<0 || debounce<0) {
fprintf (stderr, " invalid parameter\n");
exit(-2);
}
doWfiInternal(argv[1], pin, mode, interations, timeoutSec, debounce);
exit(-1); // timeout
}
/*
* doEdge: -> deprecated, removed
* gpio edge pin mode
* Easy access to changing the edge trigger on a GPIO pin
* This uses the /sys/class/gpio device interface.
*********************************************************************************
*/
/*
* doUnexport: -> deprecated, removed
* gpio unexport pin
* This uses the /sys/class/gpio device interface.
*********************************************************************************
*/
/*
* doUnexportAll: -> deprecated, removed
* gpio unexportall
* Un-Export all the GPIO pins.
* This uses the /sys/class/gpio device interface.
*********************************************************************************
*/
/*
* doReset:
* Reset the GPIO pins - as much as we can do
*********************************************************************************
*/
static void doReset (UNU char *progName)
{
printf ("GPIO Reset is dangerous and has been removed from the gpio command.\n") ;
printf (" - Please write a shell-script to reset the GPIO pins into the state\n") ;
printf (" that you need them in for your applications.\n") ;
}
/*
* doMode:
* gpio mode pin mode ...
*********************************************************************************
*/
void doMode (int argc, char *argv [])
{
int pin ;
char *mode ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s mode pin mode\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
mode = argv [3] ;
if (strcasecmp (mode, "in") == 0) pinMode (pin, INPUT) ;
else if (strcasecmp (mode, "input") == 0) pinMode (pin, INPUT) ;
else if (strcasecmp (mode, "out") == 0) pinMode (pin, OUTPUT) ;
else if (strcasecmp (mode, "output") == 0) pinMode (pin, OUTPUT) ;
else if (strcasecmp (mode, "pwm") == 0) pinMode (pin, PWM_OUTPUT) ;
else if (strcasecmp (mode, "pwmTone") == 0) pinMode (pin, PWM_TONE_OUTPUT) ;
else if (strcasecmp (mode, "clock") == 0) pinMode (pin, GPIO_CLOCK) ;
else if (strcasecmp (mode, "up") == 0) pullUpDnControl (pin, PUD_UP) ;
else if (strcasecmp (mode, "down") == 0) pullUpDnControl (pin, PUD_DOWN) ;
else if (strcasecmp (mode, "tri") == 0) pullUpDnControl (pin, PUD_OFF) ;
else if (strcasecmp (mode, "off") == 0) pullUpDnControl (pin, PUD_OFF) ;
else if (strcasecmp (mode, "alt0") == 0) pinModeAlt (pin, 0b100) ;
else if (strcasecmp (mode, "alt1") == 0) pinModeAlt (pin, 0b101) ;
else if (strcasecmp (mode, "alt2") == 0) pinModeAlt (pin, 0b110) ;
else if (strcasecmp (mode, "alt3") == 0) pinModeAlt (pin, 0b111) ;
else if (strcasecmp (mode, "alt4") == 0) pinModeAlt (pin, 0b011) ;
else if (strcasecmp (mode, "alt5") == 0) pinModeAlt (pin, 0b010) ;
else
{
fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/clock/up/down/tri\n", argv [1], mode) ;
exit (1) ;
}
}
/*
* doPadDrive:
* gpio drive group value
*********************************************************************************
*/
static void doPadDrivePin (int argc, char *argv [])
{
if (argc != 4) {
fprintf (stderr, "Usage: %s drivepin pin value\n", argv [0]) ;
exit (1) ;
}
int pin = atoi (argv [2]) ;
int val = atoi (argv [3]) ;
if ((pin < 0) || (pin > 27)) {
fprintf (stderr, "%s: drive pin not 0-27: %d\n", argv [0], pin) ;
exit (1) ;
}
if ((val < 0) || (val > 3)) {
fprintf (stderr, "%s: drive value not 0-3: %d\n", argv [0], val) ;
exit (1) ;
}
setPadDrivePin (pin, val) ;
}
static void doPadDrive (int argc, char *argv [])
{
int group, val ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s drive group value\n", argv [0]) ;
exit (1) ;
}
group = atoi (argv [2]) ;
val = atoi (argv [3]) ;
if ((group < -1) || (group > 2)) //-1 hidden feature for read and print values
{
fprintf (stderr, "%s: drive group not 0, 1 or 2: %d\n", argv [0], group) ;
exit (1) ;
}
if ((val < 0) || (val > 7))
{
fprintf (stderr, "%s: drive value not 0-7: %d\n", argv [0], val) ;
exit (1) ;
}
setPadDrive (group, val) ;
}
/*
* doUsbP:
* Control USB Power - High (1.2A) or Low (600mA)
* gpio usbp high/low
*********************************************************************************
*/
static void doUsbP (int argc, char *argv [])
{
int model, rev, mem, maker, overVolted ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s usbp high|low\n", argv [0]) ;
exit (1) ;
}
// Make sure we're on a B+
piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
if (!((model == PI_MODEL_BP) || (model == PI_MODEL_2)))
{
fprintf (stderr, "USB power contol is applicable to B+ and v2 boards only.\n") ;
exit (1) ;
}
// Make sure we start in BCM_GPIO mode
wiringPiSetupGpio () ;
if ((strcasecmp (argv [2], "high") == 0) || (strcasecmp (argv [2], "hi") == 0))
{
digitalWrite (PI_USB_POWER_CONTROL, 1) ;
pinMode (PI_USB_POWER_CONTROL, OUTPUT) ;
printf ("Switched to HIGH current USB (1.2A)\n") ;
return ;
}
if ((strcasecmp (argv [2], "low") == 0) || (strcasecmp (argv [2], "lo") == 0))
{
digitalWrite (PI_USB_POWER_CONTROL, 0) ;
pinMode (PI_USB_POWER_CONTROL, OUTPUT) ;
printf ("Switched to LOW current USB (600mA)\n") ;
return ;
}
fprintf (stderr, "Usage: %s usbp high|low\n", argv [0]) ;
exit (1) ;
}
/*
* doGbw:
* gpio gbw channel value
* Gertboard Write - To the Analog output
*********************************************************************************
*/
static void doGbw (int argc, char *argv [])
{
int channel, value ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s gbw <channel> <value>\n", argv [0]) ;
exit (1) ;
}
channel = atoi (argv [2]) ;
value = atoi (argv [3]) ;
if ((channel < 0) || (channel > 1))
{
fprintf (stderr, "%s: gbw: Channel number must be 0 or 1\n", argv [0]) ;
exit (1) ;
}
if ((value < 0) || (value > 255))
{
fprintf (stderr, "%s: gbw: Value must be from 0 to 255\n", argv [0]) ;
exit (1) ;
}
if (gertboardAnalogSetup (64) < 0)
{
fprintf (stderr, "Unable to initialise the Gertboard SPI interface: %s\n", strerror (errno)) ;
exit (1) ;
}
analogWrite (64 + channel, value) ;
}
/*
* doGbr:
* gpio gbr channel
* From the analog input
*********************************************************************************
*/
static void doGbr (int argc, char *argv [])
{
int channel ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s gbr <channel>\n", argv [0]) ;
exit (1) ;
}
channel = atoi (argv [2]) ;
if ((channel < 0) || (channel > 1))
{
fprintf (stderr, "%s: gbr: Channel number must be 0 or 1\n", argv [0]) ;
exit (1) ;
}
if (gertboardAnalogSetup (64) < 0)
{
fprintf (stderr, "Unable to initialise the Gertboard SPI interface: %s\n", strerror (errno)) ;
exit (1) ;
}
printf ("%d\n", analogRead (64 + channel)) ;
}
/*
* doWrite:
* gpio write pin value
*********************************************************************************
*/
static void doWrite (int argc, char *argv [])
{
int pin, val ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s write pin value\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
if ((strcasecmp (argv [3], "up") == 0) || (strcasecmp (argv [3], "on") == 0))
val = 1 ;
else if ((strcasecmp (argv [3], "down") == 0) || (strcasecmp (argv [3], "off") == 0))
val = 0 ;
else
val = atoi (argv [3]) ;
if (val == 0)
digitalWrite (pin, LOW) ;
else
digitalWrite (pin, HIGH) ;
}
/*
* doAwriterite:
* gpio awrite pin value
*********************************************************************************
*/
static void doAwrite (int argc, char *argv [])
{
int pin, val ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s awrite pin value\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
val = atoi (argv [3]) ;
analogWrite (pin, val) ;
}
/*
* doWriteByte:
* gpio wb value
*********************************************************************************
*/
static void doWriteByte (int argc, char *argv [])
{
int val ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s wb value\n", argv [0]) ;
exit (1) ;
}
val = (int)strtol (argv [2], NULL, 0) ;
digitalWriteByte (val) ;
}
/*
* doReadByte:
* gpio rbx|rbd value
*********************************************************************************
*/
static void doReadByte (int argc, char *argv [], int printHex)
{
int val ;
if (argc != 2)
{
fprintf (stderr, "Usage: %s rbx|rbd\n", argv [0]) ;
exit (1) ;
}
val = digitalReadByte () ;
if (printHex)
printf ("%02X\n", val) ;
else
printf ("%d\n", val) ;
}
/*
* doRead:
* Read a pin and return the value
*********************************************************************************
*/
void doRead (int argc, char *argv [])
{
int pin, val ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s read pin\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
val = digitalRead (pin) ;
printf ("%s\n", val == 0 ? "0" : "1") ;
}
/*
* doAread:
* Read an analog pin and return the value
*********************************************************************************
*/
void doAread (int argc, char *argv [])
{
if (argc != 3)
{
fprintf (stderr, "Usage: %s aread pin\n", argv [0]) ;
exit (1) ;
}
printf ("%d\n", analogRead (atoi (argv [2]))) ;
}
/*
* doToggle:
* Toggle an IO pin
*********************************************************************************
*/
void doToggle (int argc, char *argv [])
{
int pin ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s toggle pin\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
digitalWrite (pin, !digitalRead (pin)) ;
}
/*
* doBlink:
* Blink an IO pin
*********************************************************************************
*/
void doBlink (int argc, char *argv [])
{
int pin ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s blink pin\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
pinMode (pin, OUTPUT) ;
for (;;)
{
digitalWrite (pin, !digitalRead (pin)) ;
delay (500) ;
}
}
/*
* doPwmTone:
* Output a tone in a PWM pin
*********************************************************************************
*/
void doPwmTone (int argc, char *argv [])
{
int pin, freq ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s pwmTone <pin> <freq>\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
freq = atoi (argv [3]) ;
pwmToneWrite (pin, freq) ;
}
/*
* doClock:
* Output a clock on a pin
*********************************************************************************
*/
void doClock (int argc, char *argv [])
{
int pin, freq ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s clock <pin> <freq>\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
freq = atoi (argv [3]) ;
gpioClockSet (pin, freq) ;
}
/*
* doPwm:
* Output a PWM value on a pin
*********************************************************************************
*/
void doPwm (int argc, char *argv [])
{
int pin, val ;
if (argc != 4)
{
fprintf (stderr, "Usage: %s pwm <pin> <value>\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
val = atoi (argv [3]) ;
pwmWrite (pin, val) ;
}
/*
* doPwmMode: doPwmRange: doPwmClock:
* Change the PWM mode, range and clock divider values
*********************************************************************************
*/
static void doPwmMode (int mode)
{
pwmSetMode (mode) ;
}
static void doPwmRange (int argc, char *argv [])
{
unsigned int range ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s pwmr <range>\n", argv [0]) ;
exit (1) ;
}
range = (unsigned int)strtoul (argv [2], NULL, 10) ;
if (range == 0)
{
fprintf (stderr, "%s: range must be > 0\n", argv [0]) ;
exit (1) ;
}
pwmSetRange (range) ;
}
static void doPwmClock (int argc, char *argv [])
{
unsigned int clock ;
if (argc != 3)
{
fprintf (stderr, "Usage: %s pwmc <clock>\n", argv [0]) ;
exit (1) ;
}
clock = (unsigned int)strtoul (argv [2], NULL, 10) ;
if ((clock < 1) || (clock > 4095))
{
fprintf (stderr, "%s: pwm clock must be between 1 and 4095\n", argv [0]) ;
exit (1) ;
}
pwmSetClock (clock) ;
}
/*
* doVersion:
* Handle the ever more complicated version command and print out
* some usefull information.
*********************************************************************************
*/
static void doVersion (char *argv [])
{
int model, rev, mem, maker, warranty ;
struct stat statBuf ;
char name [80] ;
FILE *fd ;
int vMaj, vMin ;
wiringPiVersion (&vMaj, &vMin) ;
printf ("gpio version: %d.%d\n", vMaj, vMin) ;
printf ("Copyright (c) 2012-2025 Gordon Henderson and contributors\n") ;
printf ("This is free software with ABSOLUTELY NO WARRANTY.\n") ;
printf ("For details type: %s -warranty\n", argv [0]) ;
printf ("\n") ;
piBoardId (&model, &rev, &mem, &maker, &warranty) ;
printf ("Hardware details:\n") ;
printf (" Type: %s, Revision: %s, Memory: %dMB, Maker: %s %s\n",
piModelNames [model], piRevisionNames [rev], piMemorySize [mem], piMakerNames [maker], warranty ? "[Out of Warranty]" : "") ;
// Check for device tree
printf ("\nSystem details:\n") ;
if (stat ("/proc/device-tree", &statBuf) == 0) { // We're on a devtree system ...
printf (" * Device tree present.\n") ;
}
if (stat ("/proc/device-tree/model", &statBuf) == 0) // Output Kernel idea of board type
{
if ((fd = fopen ("/proc/device-tree/model", "r")) != NULL)
{
if (fgets(name, sizeof(name), fd) == NULL) {
// Handle error or end of file condition
perror("Error reading /proc/device-tree/model");
}
fclose (fd) ;
printf (" Model: %s\n", name) ;
}
}
int bGlobalAccess = wiringPiGlobalMemoryAccess(); // User level GPIO is GO
switch(bGlobalAccess) {
case 0:
printf (" * Does not support basic user-level GPIO access via memory.\n") ;
break;
case 1:
printf (" * Supports basic user-level GPIO access via /dev/mem.\n") ;
break;
case 2:
printf (" * Supports full user-level GPIO access via memory.\n") ;
break;
}
if (wiringPiUserLevelAccess()) {
printf (" * Supports basic user-level GPIO access via /dev/gpiomem.\n") ;
} else {
printf (" * Does not support basic user-level GPIO access via /dev/gpiomem.\n") ;
if(0==bGlobalAccess) {
printf (" * root or sudo may be required for direct GPIO access.\n") ;
}
}
if (wiringPiGpioDeviceGetFd()>0) {
printf (" * Supports basic user-level GPIO access via /dev/gpiochip (slow).\n") ;
}
}
static void doIs40Pin ()
{
exit(piBoard40Pin() ? EXIT_SUCCESS : EXIT_FAILURE);
}
/*
* main:
* Start here
*********************************************************************************
*/
int main (int argc, char *argv [])
{
int i ;
if (getenv ("WIRINGPI_DEBUG") != NULL)
{
printf ("gpio: wiringPi debug mode enabled\n") ;
wiringPiDebug = TRUE ;
}
if (getenv ("GPIO_DEBUG") != NULL)
{
printf ("gpio: gpio debug mode enabled\n") ;
gpioDebug = TRUE ;
}
if (argc == 1)
{
fprintf (stderr,
"%s: At your service!\n"
" Type: gpio -h for full details and\n"
" gpio readall for a quick printout of your connector details\n", argv [0]) ;
exit (EXIT_FAILURE) ;
}
// Help
if (strcasecmp (argv [1], "-h") == 0)
{
printf ("%s: %s\n", argv [0], usage) ;
exit (EXIT_SUCCESS) ;
}
// Version & Warranty
// Wish I could remember why I have both -R and -V ...
if ((strcmp (argv [1], "-R") == 0) || (strcmp (argv [1], "-V") == 0))
{
printf ("%d\n", piGpioLayout ()) ;
exit (EXIT_SUCCESS) ;
}
// Version and information
if (strcmp (argv [1], "-v") == 0)
{
doVersion (argv) ;
exit (EXIT_SUCCESS) ;
}
if (strcasecmp (argv [1], "-warranty") == 0)
{
printf ("gpio version: %s\n", VERSION) ;
printf ("Copyright (c) 2012-2025 Gordon Henderson and contributors\n") ;
printf ("\n") ;
printf (" This program is free software; you can redistribute it and/or modify\n") ;
printf (" it under the terms of the GNU Leser General Public License as published\n") ;
printf (" by the Free Software Foundation, either version 3 of the License, or\n") ;
printf (" (at your option) any later version.\n") ;
printf ("\n") ;
printf (" This program is distributed in the hope that it will be useful,\n") ;
printf (" but WITHOUT ANY WARRANTY; without even the implied warranty of\n") ;
printf (" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n") ;
printf (" GNU Lesser General Public License for more details.\n") ;
printf ("\n") ;
printf (" You should have received a copy of the GNU Lesser General Public License\n") ;
printf (" along with this program. If not, see <http://www.gnu.org/licenses/>.\n") ;
printf ("\n") ;
exit (EXIT_SUCCESS) ;
}
if (geteuid () != 0)
{
fprintf (stderr, "%s: Must be root to run. Program should be suid root. This is an error.\n", argv [0]) ;
exit (EXIT_FAILURE) ;
}
// Initial test for /sys/class/gpio operations: --> deprecated, empty but still there
if (strcasecmp (argv [1], "exports" ) == 0) { SYSFS_DEPRECATED(argv[0]); return 0 ; }
else if (strcasecmp (argv [1], "export" ) == 0) { SYSFS_DEPRECATED(argv[0]); return 0 ; }
else if (strcasecmp (argv [1], "edge" ) == 0) { SYSFS_DEPRECATED(argv[0]); return 0 ; }
else if (strcasecmp (argv [1], "unexport" ) == 0) { SYSFS_DEPRECATED(argv[0]); return 0 ; }
else if (strcasecmp (argv [1], "unexportall") == 0) { SYSFS_DEPRECATED(argv[0]); return 0 ; }
// Check for un-/load command: --> deprecated, empty but still there
if (strcasecmp (argv [1], "load" ) == 0) { LOAD_DEPRECATED(argv[0]) ; return 0 ; }
if (strcasecmp (argv [1], "unload" ) == 0) { LOAD_DEPRECATED(argv[0]) ; return 0 ; }
// Check for usb power command
if (strcasecmp (argv [1], "usbp" ) == 0) { doUsbP (argc, argv) ; return 0 ; }
// Gertboard commands
if (strcasecmp (argv [1], "gbr" ) == 0) { doGbr (argc, argv) ; return 0 ; }
if (strcasecmp (argv [1], "gbw" ) == 0) { doGbw (argc, argv) ; return 0 ; }
// Check for allreadall command, force Gpio mode
if (strcasecmp (argv [1], "allreadall") == 0)
{
wiringPiSetupGpio () ;
doAllReadall () ;
return 0 ;
}
// Check for -g argument
if (strcasecmp (argv [1], "-g") == 0)
{
wiringPiSetupGpio () ;
for (i = 2 ; i < argc ; ++i)
argv [i - 1] = argv [i] ;
--argc ;
wpMode = WPI_MODE_GPIO ;
}
// Check for -1 argument
else if (strcasecmp (argv [1], "-1") == 0)
{
wiringPiSetupPhys () ;
for (i = 2 ; i < argc ; ++i)
argv [i - 1] = argv [i] ;
--argc ;
wpMode = WPI_MODE_PHYS ;
}
// Check for -p argument for PiFace
else if (strcasecmp (argv [1], "-p") == 0)
{
piFaceSetup (200) ;
for (i = 2 ; i < argc ; ++i)
argv [i - 1] = argv [i] ;
--argc ;
wpMode = WPI_MODE_PIFACE ;
}
// Check for -z argument so we don't actually initialise wiringPi
else if (strcasecmp (argv [1], "-z") == 0)
{
for (i = 2 ; i < argc ; ++i)
argv [i - 1] = argv [i] ;
--argc ;
wpMode = WPI_MODE_UNINITIALISED ;
}
// Default to wiringPi mode
else
{
wiringPiSetup () ;
wpMode = WPI_MODE_PINS ;
}
// Check for -x argument to load in a new extension
// -x extension:base:args
// Can load many modules, but unless daemon mode we can only send one
// command at a time.
while (strcasecmp (argv [1], "-x") == 0)
{
if (argc < 3)
{
fprintf (stderr, "%s: -x missing extension command.\n", argv [0]) ;
exit (EXIT_FAILURE) ;
}
if (!loadWPiExtension (argv [0], argv [2], TRUE))
{
fprintf (stderr, "%s: Extension load failed: %s\n", argv [0], strerror (errno)) ;
exit (EXIT_FAILURE) ;
}
// Shift args down by 2
for (i = 3 ; i < argc ; ++i)
argv [i - 2] = argv [i] ;
argc -= 2 ;
}
if (argc <= 1)
{
fprintf (stderr, "%s: no command given\n", argv [0]) ;
exit (EXIT_FAILURE) ;
}
// Core wiringPi functions
if (strcasecmp (argv [1], "mode" ) == 0) doMode (argc, argv) ;
else if (strcasecmp (argv [1], "read" ) == 0) doRead (argc, argv) ;
else if (strcasecmp (argv [1], "write" ) == 0) doWrite (argc, argv) ;
else if (strcasecmp (argv [1], "pwm" ) == 0) doPwm (argc, argv) ;
else if (strcasecmp (argv [1], "awrite" ) == 0) doAwrite (argc, argv) ;
else if (strcasecmp (argv [1], "aread" ) == 0) doAread (argc, argv) ;
// GPIO Nicies
else if (strcasecmp (argv [1], "toggle" ) == 0) doToggle (argc, argv) ;
else if (strcasecmp (argv [1], "blink" ) == 0) doBlink (argc, argv) ;
// Pi Specifics
else if (strcasecmp (argv [1], "pwm-bal" ) == 0) doPwmMode (PWM_MODE_BAL) ;
else if (strcasecmp (argv [1], "pwm-ms" ) == 0) doPwmMode (PWM_MODE_MS) ;
else if (strcasecmp (argv [1], "pwmr" ) == 0) doPwmRange (argc, argv) ;
else if (strcasecmp (argv [1], "pwmc" ) == 0) doPwmClock (argc, argv) ;
else if (strcasecmp (argv [1], "pwmTone" ) == 0) doPwmTone (argc, argv) ;
else if (strcasecmp (argv [1], "drive" ) == 0) doPadDrive (argc, argv) ;
else if (strcasecmp (argv [1], "drivepin" ) == 0) doPadDrivePin(argc, argv) ;
else if (strcasecmp (argv [1], "readall" ) == 0) doReadall () ;
else if (strcasecmp (argv [1], "nreadall" ) == 0) doReadall () ;
else if (strcasecmp (argv [1], "pins" ) == 0) doReadall () ;
else if (strcasecmp (argv [1], "qmode" ) == 0) doQmode (argc, argv) ;
else if (strcasecmp (argv [1], "i2cdetect") == 0) doI2Cdetect (argv [0]) ;
else if (strcasecmp (argv [1], "i2cd" ) == 0) doI2Cdetect (argv [0]) ;
else if (strcasecmp (argv [1], "reset" ) == 0) doReset (argv [0]) ;
else if (strcasecmp (argv [1], "wb" ) == 0) doWriteByte (argc, argv) ;
else if (strcasecmp (argv [1], "rbx" ) == 0) doReadByte (argc, argv, TRUE) ;
else if (strcasecmp (argv [1], "rbd" ) == 0) doReadByte (argc, argv, FALSE) ;
else if (strcasecmp (argv [1], "clock" ) == 0) doClock (argc, argv) ;
else if (strcasecmp (argv [1], "wfis" ) == 0) doWfi2 (argc, argv) ;
else if (strcasecmp (argv [1], "wfi" ) == 0) doWfi (argc, argv) ;
else if (strcasecmp (argv [1], "is40pin" ) == 0) doIs40Pin () ;
else
{
fprintf (stderr, "%s: Unknown command: %s.\n", argv [0], argv [1]) ;
exit (EXIT_FAILURE) ;
}
return 0 ;
}
Reference in New Issue View Git Blame Copy Permalink