heuzef
/
WiringPi
镜像自地址 https://github.com/WiringPi/WiringPi.git
1
0
派生 0
代码 工单 0 版本发布 9 百科 动态
您最多选择25个主题 主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
126 提交
10 分支
53 MiB
 
 
 
 
 
目录树: 6a375d1f9e
分支列表 标签列表
${ item.name }
创建分支 ${ searchTerm }
从 '6a375d1f9e'
${ noResults }
WiringPi/gpio/gpio.c

1403 行
33 KiB
原始文件 Blame 文件历史 

  1. /*

  2.  * gpio.c:

  3.  *	Swiss-Army-Knife, Set-UID command-line interface to the Raspberry

  4.  *	Pi's GPIO.

  5.  *	Copyright (c) 2012-2015 Gordon Henderson

  6.  ***********************************************************************

  7.  * This file is part of wiringPi:

  8.  *	https://projects.drogon.net/raspberry-pi/wiringpi/

  9.  *

  10.  *    wiringPi is free software: you can redistribute it and/or modify

  11.  *    it under the terms of the GNU Lesser General Public License as published by

  12.  *    the Free Software Foundation, either version 3 of the License, or

  13.  *    (at your option) any later version.

  14.  *

  15.  *    wiringPi is distributed in the hope that it will be useful,

  16.  *    but WITHOUT ANY WARRANTY; without even the implied warranty of

  17.  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  18.  *    GNU Lesser General Public License for more details.

  19.  *

  20.  *    You should have received a copy of the GNU Lesser General Public License

  21.  *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.

  22.  ***********************************************************************

  23.  */

  24. 

  25. 

  26. #include <stdio.h>

  27. #include <stdlib.h>

  28. #include <stdint.h>

  29. #include <ctype.h>

  30. #include <string.h>

  31. #include <unistd.h>

  32. #include <errno.h>

  33. #include <fcntl.h>

  34. #include <sys/types.h>

  35. #include <sys/stat.h>

  36. 

  37. #include <wiringPi.h>

  38. #include <wpiExtensions.h>

  39. 

  40. #include <gertboard.h>

  41. #include <piFace.h>

  42. 

  43. #include "version.h"

  44. 

  45. extern int wiringPiDebug ;

  46. 

  47. // External functions I can't be bothered creating a separate .h file for:

  48. 

  49. extern void doReadall    (void) ;

  50. extern void doAllReadall (void) ;

  51. extern void doPins       (void) ;

  52. 

  53. #ifndef TRUE

  54. #  define	TRUE	(1==1)

  55. #  define	FALSE	(1==2)

  56. #endif

  57. 

  58. #define	PI_USB_POWER_CONTROL	38

  59. #define	I2CDETECT		"/usr/sbin/i2cdetect"

  60. 

  61. int wpMode ;

  62. 

  63. char *usage = "Usage: gpio -v\n"

  64.               "       gpio -h\n"

  65.               "       gpio [-g|-1] [-x extension:params] ...\n"

  66.               "       gpio [-p] <read/write/wb> ...\n"

  67.               "       gpio <read/write/aread/awritewb/pwm/clock/mode> ...\n"

  68. 	      "       gpio readall/reset\n"

  69. 	      "       gpio unexportall/exports\n"

  70. 	      "       gpio export/edge/unexport ...\n"

  71. 	      "       gpio wfi <pin> <mode>\n"

  72. 	      "       gpio drive <group> <value>\n"

  73. 	      "       gpio pwm-bal/pwm-ms \n"

  74. 	      "       gpio pwmr <range> \n"

  75. 	      "       gpio pwmc <divider> \n"

  76. 	      "       gpio load spi/i2c\n"

  77. 	      "       gpio unload spi/i2c\n"

  78. 	      "       gpio i2cd/i2cdetect\n"

  79. 	      "       gpio usbp high/low\n"

  80. 	      "       gpio gbr <channel>\n"

  81. 	      "       gpio gbw <channel> <value>" ;	// No trailing newline needed here.

  82. 

  83. 

  84. #ifdef	NOT_FOR_NOW

  85. /*

  86.  * decodePin:

  87.  *	Decode a pin "number" which can actually be a pin name to represent

  88.  *	one of the Pi's on-board pins.

  89.  *********************************************************************************

  90.  */

  91. 

  92. static int decodePin (const char *str)

  93. {

  94. 

  95. // The first case - see if it's a number:

  96. 

  97.   if (isdigit (str [0]))

  98.     return atoi (str) ;

  99. 

  100.   return 0 ;

  101. }

  102. #endif

  103. 

  104. 

  105. /*

  106.  * changeOwner:

  107.  *	Change the ownership of the file to the real userId of the calling

  108.  *	program so we can access it.

  109.  *********************************************************************************

  110.  */

  111. 

  112. static void changeOwner (char *cmd, char *file)

  113. {

  114.   uid_t uid = getuid () ;

  115.   uid_t gid = getgid () ;

  116. 

  117.   if (chown (file, uid, gid) != 0)

  118.   {

  119. 

  120. // Removed (ignoring) the check for not existing as I'm fed-up with morons telling me that

  121. //	the warning message is an error.

  122. 

  123.     if (errno != ENOENT)

  124.       fprintf (stderr, "%s: Unable to change ownership of %s: %s\n", cmd, file, strerror (errno)) ;

  125.   }

  126. }

  127. 

  128. 

  129. /*

  130.  * moduleLoaded:

  131.  *	Return true/false if the supplied module is loaded

  132.  *********************************************************************************

  133.  */

  134. 

  135. static int moduleLoaded (char *modName)

  136. {

  137.   int len   = strlen (modName) ;

  138.   int found = FALSE ;

  139.   FILE *fd = fopen ("/proc/modules", "r") ;

  140.   char line [80] ;

  141. 

  142.   if (fd == NULL)

  143.   {

  144.     fprintf (stderr, "gpio: Unable to check /proc/modules: %s\n", strerror (errno)) ;

  145.     exit (1) ;

  146.   }

  147. 

  148.   while (fgets (line, 80, fd) != NULL)

  149.   {

  150.     if (strncmp (line, modName, len) != 0)

  151.       continue ;

  152. 

  153.     found = TRUE ;

  154.     break ;

  155.   }

  156. 

  157.   fclose (fd) ;

  158. 

  159.   return found ;

  160. }

  161. 

  162. 

  163. /*

  164.  * doLoad:

  165.  *	Load either the spi or i2c modules and change device ownerships, etc.

  166.  *********************************************************************************

  167.  */

  168. 

  169. static void checkDevTree (char *argv [])

  170. {

  171.   struct stat statBuf ;

  172. 

  173.   if (stat ("/proc/device-tree", &statBuf) == 0)	// We're on a devtree system ...

  174.   {

  175.     fprintf (stderr,

  176. "%s: Unable to load/unload modules as this Pi has the device tree enabled.\n"

  177. "  You need to run the raspi-config program (as root) and select the\n"

  178. "  modules (SPI or I2C) that you wish to load/unload there and reboot.\n"

  179. "  There is more information here:\n"

  180. "      https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=97314\n", argv [0]) ;

  181.     exit (1) ;

  182.   }

  183. }

  184. 

  185. static void _doLoadUsage (char *argv [])

  186. {

  187.   fprintf (stderr, "Usage: %s load <spi/i2c> [I2C baudrate in Kb/sec]\n", argv [0]) ;

  188.   exit (1) ;

  189. }

  190. 

  191. static void doLoad (int argc, char *argv [])

  192. {

  193.   char *module1, *module2 ;

  194.   char cmd [80] ;

  195.   char *file1, *file2 ;

  196.   char args1 [32], args2 [32] ;

  197. 

  198.   checkDevTree (argv) ;

  199. 

  200.   if (argc < 3)

  201.     _doLoadUsage (argv) ;

  202. 

  203.   args1 [0] = args2 [0] = 0 ;

  204. 

  205.   /**/ if (strcasecmp (argv [2], "spi") == 0)

  206.   {

  207.     module1 = "spidev" ;

  208.     module2 = "spi_bcm2708" ;

  209.     file1  = "/dev/spidev0.0" ;

  210.     file2  = "/dev/spidev0.1" ;

  211.     if (argc == 4)

  212.     {

  213.       fprintf (stderr, "%s: Unable to set the buffer size now. Load aborted. Please see the man page.\n", argv [0]) ;

  214.       exit (1) ;

  215.     }

  216.     else if (argc > 4)

  217.       _doLoadUsage (argv) ;

  218.   }

  219.   else if (strcasecmp (argv [2], "i2c") == 0)

  220.   {

  221.     module1 = "i2c_dev" ;

  222.     module2 = "i2c_bcm2708" ;

  223.     file1  = "/dev/i2c-0" ;

  224.     file2  = "/dev/i2c-1" ;

  225.     if (argc == 4)

  226.       sprintf (args2, " baudrate=%d", atoi (argv [3]) * 1000) ;

  227.     else if (argc > 4)

  228.       _doLoadUsage (argv) ;

  229.   }

  230.   else

  231.     _doLoadUsage (argv) ;

  232. 

  233.   if (!moduleLoaded (module1))

  234.   {

  235.     sprintf (cmd, "/sbin/modprobe %s%s", module1, args1) ;

  236.     system (cmd) ;

  237.   }

  238. 

  239.   if (!moduleLoaded (module2))

  240.   {

  241.     sprintf (cmd, "/sbin/modprobe %s%s", module2, args2) ;

  242.     system (cmd) ;

  243.   }

  244. 

  245.   if (!moduleLoaded (module2))

  246.   {

  247.     fprintf (stderr, "%s: Unable to load %s\n", argv [0], module2) ;

  248.     exit (1) ;

  249.   }

  250. 

  251.   sleep (1) ;	// To let things get settled

  252. 

  253.   changeOwner (argv [0], file1) ;

  254.   changeOwner (argv [0], file2) ;

  255. }

  256. 

  257. 

  258. /*

  259.  * doUnLoad:

  260.  *	Un-Load either the spi or i2c modules and change device ownerships, etc.

  261.  *********************************************************************************

  262.  */

  263. 

  264. static void _doUnLoadUsage (char *argv [])

  265. {

  266.   fprintf (stderr, "Usage: %s unload <spi/i2c>\n", argv [0]) ;

  267.   exit (1) ;

  268. }

  269. 

  270. static void doUnLoad (int argc, char *argv [])

  271. {

  272.   char *module1, *module2 ;

  273.   char cmd [80] ;

  274. 

  275.   checkDevTree (argv) ;

  276. 

  277.   if (argc != 3)

  278.     _doUnLoadUsage (argv) ;

  279. 

  280.   /**/ if (strcasecmp (argv [2], "spi") == 0)

  281.   {

  282.     module1 = "spidev" ;

  283.     module2 = "spi_bcm2708" ;

  284.   }

  285.   else if (strcasecmp (argv [2], "i2c") == 0)

  286.   {

  287.     module1 = "i2c_dev" ;

  288.     module2 = "i2c_bcm2708" ;

  289.   }

  290.   else

  291.     _doUnLoadUsage (argv) ;

  292. 

  293.   if (moduleLoaded (module1))

  294.   {

  295.     sprintf (cmd, "/sbin/rmmod %s", module1) ;

  296.     system (cmd) ;

  297.   }

  298. 

  299.   if (moduleLoaded (module2))

  300.   {

  301.     sprintf (cmd, "/sbin/rmmod %s", module2) ;

  302.     system (cmd) ;

  303.   }

  304. }

  305. 

  306. 

  307. /*

  308.  * doI2Cdetect:

  309.  *	Run the i2cdetect command with the right runes for this Pi revision

  310.  *********************************************************************************

  311.  */

  312. 

  313. static void doI2Cdetect (int argc, char *argv [])

  314. {

  315.   int port = piBoardRev () == 1 ? 0 : 1 ;

  316.   char command [128] ;

  317.   struct stat statBuf ;

  318. 

  319.   if (stat (I2CDETECT, &statBuf) < 0)

  320.   {

  321.     fprintf (stderr, "%s: Unable to find i2cdetect command: %s\n", argv [0], strerror (errno)) ;

  322.     return ;

  323.   }

  324. 

  325.   if (!moduleLoaded ("i2c_dev"))

  326.   {

  327.     fprintf (stderr, "%s: The I2C kernel module(s) are not loaded.\n", argv [0]) ;

  328.     return ;

  329.   }

  330. 

  331.   sprintf (command, "%s -y %d", I2CDETECT, port) ;

  332.   if (system (command) < 0)

  333.     fprintf (stderr, "%s: Unable to run i2cdetect: %s\n", argv [0], strerror (errno)) ;

  334. 

  335. }

  336. 

  337. 

  338. /*

  339.  * doExports:

  340.  *	List all GPIO exports

  341.  *********************************************************************************

  342.  */

  343. 

  344. static void doExports (int argc, char *argv [])

  345. {

  346.   int fd ;

  347.   int i, l, first ;

  348.   char fName [128] ;

  349.   char buf [16] ;

  350. 

  351.   for (first = 0, i = 0 ; i < 64 ; ++i)	// Crude, but effective

  352.   {

  353. 

  354. // Try to read the direction

  355. 

  356.     sprintf (fName, "/sys/class/gpio/gpio%d/direction", i) ;

  357.     if ((fd = open (fName, O_RDONLY)) == -1)

  358.       continue ;

  359. 

  360.     if (first == 0)

  361.     {

  362.       ++first ;

  363.       printf ("GPIO Pins exported:\n") ;

  364.     }

  365. 

  366.     printf ("%4d: ", i) ;

  367. 

  368.     if ((l = read (fd, buf, 16)) == 0)

  369.       sprintf (buf, "%s", "?") ;

  370.  

  371.     buf [l] = 0 ;

  372.     if ((buf [strlen (buf) - 1]) == '\n')

  373.       buf [strlen (buf) - 1] = 0 ;

  374. 

  375.     printf ("%-3s", buf) ;

  376. 

  377.     close (fd) ;

  378. 

  379. // Try to Read the value

  380. 

  381.     sprintf (fName, "/sys/class/gpio/gpio%d/value", i) ;

  382.     if ((fd = open (fName, O_RDONLY)) == -1)

  383.     {

  384.       printf ("No Value file (huh?)\n") ;

  385.       continue ;

  386.     }

  387. 

  388.     if ((l = read (fd, buf, 16)) == 0)

  389.       sprintf (buf, "%s", "?") ;

  390. 

  391.     buf [l] = 0 ;

  392.     if ((buf [strlen (buf) - 1]) == '\n')

  393.       buf [strlen (buf) - 1] = 0 ;

  394. 

  395.     printf ("  %s", buf) ;

  396. 

  397. // Read any edge trigger file

  398. 

  399.     sprintf (fName, "/sys/class/gpio/gpio%d/edge", i) ;

  400.     if ((fd = open (fName, O_RDONLY)) == -1)

  401.     {

  402.       printf ("\n") ;

  403.       continue ;

  404.     }

  405. 

  406.     if ((l = read (fd, buf, 16)) == 0)

  407.       sprintf (buf, "%s", "?") ;

  408. 

  409.     buf [l] = 0 ;

  410.     if ((buf [strlen (buf) - 1]) == '\n')

  411.       buf [strlen (buf) - 1] = 0 ;

  412. 

  413.     printf ("  %-8s\n", buf) ;

  414. 

  415.     close (fd) ;

  416.   }

  417. }

  418. 

  419. 

  420. /*

  421.  * doExport:

  422.  *	gpio export pin mode

  423.  *	This uses the /sys/class/gpio device interface.

  424.  *********************************************************************************

  425.  */

  426. 

  427. void doExport (int argc, char *argv [])

  428. {

  429.   FILE *fd ;

  430.   int pin ;

  431.   char *mode ;

  432.   char fName [128] ;

  433. 

  434.   if (argc != 4)

  435.   {

  436.     fprintf (stderr, "Usage: %s export pin mode\n", argv [0]) ;

  437.     exit (1) ;

  438.   }

  439. 

  440.   pin = atoi (argv [2]) ;

  441. 

  442.   mode = argv [3] ;

  443. 

  444.   if ((fd = fopen ("/sys/class/gpio/export", "w")) == NULL)

  445.   {

  446.     fprintf (stderr, "%s: Unable to open GPIO export interface: %s\n", argv [0], strerror (errno)) ;

  447.     exit (1) ;

  448.   }

  449. 

  450.   fprintf (fd, "%d\n", pin) ;

  451.   fclose (fd) ;

  452. 

  453.   sprintf (fName, "/sys/class/gpio/gpio%d/direction", pin) ;

  454.   if ((fd = fopen (fName, "w")) == NULL)

  455.   {

  456.     fprintf (stderr, "%s: Unable to open GPIO direction interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;

  457.     exit (1) ;

  458.   }

  459. 

  460.   /**/ if ((strcasecmp (mode, "in")   == 0) || (strcasecmp (mode, "input")  == 0))

  461.     fprintf (fd, "in\n") ;

  462.   else if ((strcasecmp (mode, "out")  == 0) || (strcasecmp (mode, "output") == 0))

  463.     fprintf (fd, "out\n") ;

  464.   else if ((strcasecmp (mode, "high") == 0) || (strcasecmp (mode, "up")     == 0))

  465.     fprintf (fd, "high\n") ;

  466.   else if ((strcasecmp (mode, "low")  == 0) || (strcasecmp (mode, "down")   == 0))

  467.     fprintf (fd, "low\n") ;

  468.   else

  469.   {

  470.     fprintf (stderr, "%s: Invalid mode: %s. Should be in, out, high or low\n", argv [1], mode) ;

  471.     exit (1) ;

  472.   }

  473. 

  474.   fclose (fd) ;

  475. 

  476. // Change ownership so the current user can actually use it

  477. 

  478.   sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;

  479.   changeOwner (argv [0], fName) ;

  480. 

  481.   sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;

  482.   changeOwner (argv [0], fName) ;

  483. 

  484. }

  485. 

  486. 

  487. /*

  488.  * doWfi:

  489.  *	gpio wfi pin mode

  490.  *	Wait for Interrupt on a given pin.

  491.  *	Slight cheat here - it's easier to actually use ISR now (which calls

  492.  *	gpio to set the pin modes!) then we simply sleep, and expect the thread

  493.  *	to exit the program. Crude but effective.

  494.  *********************************************************************************

  495.  */

  496. 

  497. static void wfi (void)

  498.   { exit (0) ; }

  499. 

  500. void doWfi (int argc, char *argv [])

  501. {

  502.   int pin, mode ;

  503. 

  504.   if (argc != 4)

  505.   {

  506.     fprintf (stderr, "Usage: %s wfi pin mode\n", argv [0]) ;

  507.     exit (1) ;

  508.   }

  509. 

  510.   pin  = atoi (argv [2]) ;

  511. 

  512.   /**/ if (strcasecmp (argv [3], "rising")  == 0) mode = INT_EDGE_RISING ;

  513.   else if (strcasecmp (argv [3], "falling") == 0) mode = INT_EDGE_FALLING ;

  514.   else if (strcasecmp (argv [3], "both")    == 0) mode = INT_EDGE_BOTH ;

  515.   else

  516.   {

  517.     fprintf (stderr, "%s: wfi: Invalid mode: %s. Should be rising, falling or both\n", argv [1], argv [3]) ;

  518.     exit (1) ;

  519.   }

  520. 

  521.   if (wiringPiISR (pin, mode, &wfi) < 0)

  522.   {

  523.     fprintf (stderr, "%s: wfi: Unable to setup ISR: %s\n", argv [1], strerror (errno)) ;

  524.     exit (1) ;

  525.   }

  526. 

  527.   for (;;)

  528.     delay (9999) ;

  529. }

  530. 

  531. 

  532. 

  533. /*

  534.  * doEdge:

  535.  *	gpio edge pin mode

  536.  *	Easy access to changing the edge trigger on a GPIO pin

  537.  *	This uses the /sys/class/gpio device interface.

  538.  *********************************************************************************

  539.  */

  540. 

  541. void doEdge (int argc, char *argv [])

  542. {

  543.   FILE *fd ;

  544.   int pin ;

  545.   char *mode ;

  546.   char fName [128] ;

  547. 

  548.   if (argc != 4)

  549.   {

  550.     fprintf (stderr, "Usage: %s edge pin mode\n", argv [0]) ;

  551.     exit (1) ;

  552.   }

  553. 

  554.   pin  = atoi (argv [2]) ;

  555.   mode = argv [3] ;

  556. 

  557. // Export the pin and set direction to input

  558. 

  559.   if ((fd = fopen ("/sys/class/gpio/export", "w")) == NULL)

  560.   {

  561.     fprintf (stderr, "%s: Unable to open GPIO export interface: %s\n", argv [0], strerror (errno)) ;

  562.     exit (1) ;

  563.   }

  564. 

  565.   fprintf (fd, "%d\n", pin) ;

  566.   fclose (fd) ;

  567. 

  568.   sprintf (fName, "/sys/class/gpio/gpio%d/direction", pin) ;

  569.   if ((fd = fopen (fName, "w")) == NULL)

  570.   {

  571.     fprintf (stderr, "%s: Unable to open GPIO direction interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;

  572.     exit (1) ;

  573.   }

  574. 

  575.   fprintf (fd, "in\n") ;

  576.   fclose (fd) ;

  577. 

  578.   sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;

  579.   if ((fd = fopen (fName, "w")) == NULL)

  580.   {

  581.     fprintf (stderr, "%s: Unable to open GPIO edge interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;

  582.     exit (1) ;

  583.   }

  584. 

  585.   /**/ if (strcasecmp (mode, "none")    == 0) fprintf (fd, "none\n") ;

  586.   else if (strcasecmp (mode, "rising")  == 0) fprintf (fd, "rising\n") ;

  587.   else if (strcasecmp (mode, "falling") == 0) fprintf (fd, "falling\n") ;

  588.   else if (strcasecmp (mode, "both")    == 0) fprintf (fd, "both\n") ;

  589.   else

  590.   {

  591.     fprintf (stderr, "%s: Invalid mode: %s. Should be none, rising, falling or both\n", argv [1], mode) ;

  592.     exit (1) ;

  593.   }

  594. 

  595. // Change ownership of the value and edge files, so the current user can actually use it!

  596. 

  597.   sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;

  598.   changeOwner (argv [0], fName) ;

  599. 

  600.   sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;

  601.   changeOwner (argv [0], fName) ;

  602. 

  603.   fclose (fd) ;

  604. }

  605. 

  606. 

  607. /*

  608.  * doUnexport:

  609.  *	gpio unexport pin

  610.  *	This uses the /sys/class/gpio device interface.

  611.  *********************************************************************************

  612.  */

  613. 

  614. void doUnexport (int argc, char *argv [])

  615. {

  616.   FILE *fd ;

  617.   int pin ;

  618. 

  619.   if (argc != 3)

  620.   {

  621.     fprintf (stderr, "Usage: %s unexport pin\n", argv [0]) ;

  622.     exit (1) ;

  623.   }

  624. 

  625.   pin = atoi (argv [2]) ;

  626. 

  627.   if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)

  628.   {

  629.     fprintf (stderr, "%s: Unable to open GPIO export interface\n", argv [0]) ;

  630.     exit (1) ;

  631.   }

  632. 

  633.   fprintf (fd, "%d\n", pin) ;

  634.   fclose (fd) ;

  635. }

  636. 

  637. 

  638. /*

  639.  * doUnexportAll:

  640.  *	gpio unexportall

  641.  *	Un-Export all the GPIO pins.

  642.  *	This uses the /sys/class/gpio device interface.

  643.  *********************************************************************************

  644.  */

  645. 

  646. void doUnexportall (char *progName)

  647. {

  648.   FILE *fd ;

  649.   int pin ;

  650. 

  651.   for (pin = 0 ; pin < 63 ; ++pin)

  652.   {

  653.     if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)

  654.     {

  655.       fprintf (stderr, "%s: Unable to open GPIO export interface\n", progName) ;

  656.       exit (1) ;

  657.     }

  658.     fprintf (fd, "%d\n", pin) ;

  659.     fclose (fd) ;

  660.   }

  661. }

  662. 

  663. 

  664. /*

  665.  * doReset:

  666.  *	Reset the GPIO pins - as much as we can do

  667.  *********************************************************************************

  668.  */

  669. 

  670. static void doReset (char *progName)

  671. {

  672.   printf ("GPIO Reset is dangerous and has been removed from the gpio command.\n") ;

  673.   printf (" - Please write a shell-script to reset the GPIO pins into the state\n") ;

  674.   printf ("   that you need them in for your applications.\n") ;

  675. }

  676. 

  677. 

  678. /*

  679.  * doMode:

  680.  *	gpio mode pin mode ...

  681.  *********************************************************************************

  682.  */

  683. 

  684. void doMode (int argc, char *argv [])

  685. {

  686.   int pin ;

  687.   char *mode ;

  688. 

  689.   if (argc != 4)

  690.   {

  691.     fprintf (stderr, "Usage: %s mode pin mode\n", argv [0]) ;

  692.     exit (1) ;

  693.   }

  694. 

  695.   pin = atoi (argv [2]) ;

  696. 

  697.   mode = argv [3] ;

  698. 

  699.   /**/ if (strcasecmp (mode, "in")      == 0) pinMode         (pin, INPUT) ;

  700.   else if (strcasecmp (mode, "input")   == 0) pinMode         (pin, INPUT) ;

  701.   else if (strcasecmp (mode, "out")     == 0) pinMode         (pin, OUTPUT) ;

  702.   else if (strcasecmp (mode, "output")  == 0) pinMode         (pin, OUTPUT) ;

  703.   else if (strcasecmp (mode, "pwm")     == 0) pinMode         (pin, PWM_OUTPUT) ;

  704.   else if (strcasecmp (mode, "pwmTone") == 0) pinMode         (pin, PWM_TONE_OUTPUT) ;

  705.   else if (strcasecmp (mode, "clock")   == 0) pinMode         (pin, GPIO_CLOCK) ;

  706.   else if (strcasecmp (mode, "up")      == 0) pullUpDnControl (pin, PUD_UP) ;

  707.   else if (strcasecmp (mode, "down")    == 0) pullUpDnControl (pin, PUD_DOWN) ;

  708.   else if (strcasecmp (mode, "tri")     == 0) pullUpDnControl (pin, PUD_OFF) ;

  709.   else if (strcasecmp (mode, "off")     == 0) pullUpDnControl (pin, PUD_OFF) ;

  710.   else if (strcasecmp (mode, "alt0")    == 0) pinModeAlt (pin, 0b100) ;

  711.   else if (strcasecmp (mode, "alt1")    == 0) pinModeAlt (pin, 0b101) ;

  712.   else if (strcasecmp (mode, "alt2")    == 0) pinModeAlt (pin, 0b110) ;

  713.   else if (strcasecmp (mode, "alt3")    == 0) pinModeAlt (pin, 0b111) ;

  714.   else if (strcasecmp (mode, "alt4")    == 0) pinModeAlt (pin, 0b011) ;

  715.   else if (strcasecmp (mode, "alt5")    == 0) pinModeAlt (pin, 0b010) ;

  716.   else

  717.   {

  718.     fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/clock/up/down/tri\n", argv [1], mode) ;

  719.     exit (1) ;

  720.   }

  721. }

  722. 

  723. 

  724. /*

  725.  * doPadDrive:

  726.  *	gpio drive group value

  727.  *********************************************************************************

  728.  */

  729. 

  730. static void doPadDrive (int argc, char *argv [])

  731. {

  732.   int group, val ;

  733. 

  734.   if (argc != 4)

  735.   {

  736.     fprintf (stderr, "Usage: %s drive group value\n", argv [0]) ;

  737.     exit (1) ;

  738.   }

  739. 

  740.   group = atoi (argv [2]) ;

  741.   val   = atoi (argv [3]) ;

  742. 

  743.   if ((group < 0) || (group > 2))

  744.   {

  745.     fprintf (stderr, "%s: drive group not 0, 1 or 2: %d\n", argv [0], group) ;

  746.     exit (1) ;

  747.   }

  748. 

  749.   if ((val < 0) || (val > 7))

  750.   {

  751.     fprintf (stderr, "%s: drive value not 0-7: %d\n", argv [0], val) ;

  752.     exit (1) ;

  753.   }

  754. 

  755.   setPadDrive (group, val) ;

  756. }

  757. 

  758. 

  759. /*

  760.  * doUsbP:

  761.  *	Control USB Power - High (1.2A) or Low (600mA)

  762.  *	gpio usbp high/low

  763.  *********************************************************************************

  764.  */

  765. 

  766. static void doUsbP (int argc, char *argv [])

  767. {

  768.   int model, rev, mem, maker, overVolted ;

  769. 

  770.   if (argc != 3)

  771.   {

  772.     fprintf (stderr, "Usage: %s usbp high|low\n", argv [0]) ;

  773.     exit (1) ;

  774.   }

  775. 

  776. // Make sure we're on a B+

  777. 

  778.   piBoardId (&model, &rev, &mem, &maker, &overVolted) ;

  779. 

  780.   if (!((model == PI_MODEL_BP) || (model == PI_MODEL_2)))

  781.   {

  782.     fprintf (stderr, "USB power contol is applicable to B+ and v2 boards only.\n") ;

  783.     exit (1) ;

  784.   }

  785.     

  786. // Make sure we start in BCM_GPIO mode

  787. 

  788.   wiringPiSetupGpio () ;

  789. 

  790.   if ((strcasecmp (argv [2], "high") == 0) || (strcasecmp (argv [2], "hi") == 0))

  791.   {

  792.     digitalWrite (PI_USB_POWER_CONTROL, 1) ;

  793.     pinMode (PI_USB_POWER_CONTROL, OUTPUT) ;

  794.     printf ("Switched to HIGH current USB (1.2A)\n") ;

  795.     return ;

  796.   }

  797. 

  798.   if ((strcasecmp (argv [2], "low") == 0) || (strcasecmp (argv [2], "lo") == 0))

  799.   {

  800.     digitalWrite (PI_USB_POWER_CONTROL, 0) ;

  801.     pinMode (PI_USB_POWER_CONTROL, OUTPUT) ;

  802.     printf ("Switched to LOW current USB (600mA)\n") ;

  803.     return ;

  804.   }

  805. 

  806.   fprintf (stderr, "Usage: %s usbp high|low\n", argv [0]) ;

  807.   exit (1) ;

  808. }

  809. 

  810. 

  811. /*

  812.  * doGbw:

  813.  *	gpio gbw channel value

  814.  *	Gertboard Write - To the Analog output

  815.  *********************************************************************************

  816.  */

  817. 

  818. static void doGbw (int argc, char *argv [])

  819. {

  820.   int channel, value ;

  821. 

  822.   if (argc != 4)

  823.   {

  824.     fprintf (stderr, "Usage: %s gbw <channel> <value>\n", argv [0]) ;

  825.     exit (1) ;

  826.   }

  827. 

  828.   channel = atoi (argv [2]) ;

  829.   value   = atoi (argv [3]) ;

  830. 

  831.   if ((channel < 0) || (channel > 1))

  832.   {

  833.     fprintf (stderr, "%s: gbw: Channel number must be 0 or 1\n", argv [0]) ;

  834.     exit (1) ;

  835.   }

  836. 

  837.   if ((value < 0) || (value > 255))

  838.   {

  839.     fprintf (stderr, "%s: gbw: Value must be from 0 to 255\n", argv [0]) ;

  840.     exit (1) ;

  841.   }

  842. 

  843.   if (gertboardAnalogSetup (64) < 0)

  844.   {

  845.     fprintf (stderr, "Unable to initialise the Gertboard SPI interface: %s\n", strerror (errno)) ;

  846.     exit (1) ;

  847.   }

  848. 

  849.   analogWrite (64 + channel, value) ;

  850. }

  851. 

  852. 

  853. /*

  854.  * doGbr:

  855.  *	gpio gbr channel

  856.  *	From the analog input

  857.  *********************************************************************************

  858.  */

  859. 

  860. static void doGbr (int argc, char *argv [])

  861. {

  862.   int channel ;

  863. 

  864.   if (argc != 3)

  865.   {

  866.     fprintf (stderr, "Usage: %s gbr <channel>\n", argv [0]) ;

  867.     exit (1) ;

  868.   }

  869. 

  870.   channel = atoi (argv [2]) ;

  871. 

  872.   if ((channel < 0) || (channel > 1))

  873.   {

  874.     fprintf (stderr, "%s: gbr: Channel number must be 0 or 1\n", argv [0]) ;

  875.     exit (1) ;

  876.   }

  877. 

  878.   if (gertboardAnalogSetup (64) < 0)

  879.   {

  880.     fprintf (stderr, "Unable to initialise the Gertboard SPI interface: %s\n", strerror (errno)) ;

  881.     exit (1) ;

  882.   }

  883. 

  884.   printf ("%d\n", analogRead (64 + channel)) ;

  885. }

  886. 

  887. 

  888. /*

  889.  * doWrite:

  890.  *	gpio write pin value

  891.  *********************************************************************************

  892.  */

  893. 

  894. static void doWrite (int argc, char *argv [])

  895. {

  896.   int pin, val ;

  897. 

  898.   if (argc != 4)

  899.   {

  900.     fprintf (stderr, "Usage: %s write pin value\n", argv [0]) ;

  901.     exit (1) ;

  902.   }

  903. 

  904.   pin = atoi (argv [2]) ;

  905. 

  906.   /**/ if ((strcasecmp (argv [3], "up") == 0) || (strcasecmp (argv [3], "on") == 0))

  907.     val = 1 ;

  908.   else if ((strcasecmp (argv [3], "down") == 0) || (strcasecmp (argv [3], "off") == 0))

  909.     val = 0 ;

  910.   else

  911.     val = atoi (argv [3]) ;

  912. 

  913.   /**/ if (val == 0)

  914.     digitalWrite (pin, LOW) ;

  915.   else

  916.     digitalWrite (pin, HIGH) ;

  917. }

  918. 

  919. 

  920. /*

  921.  * doAwriterite:

  922.  *	gpio awrite pin value

  923.  *********************************************************************************

  924.  */

  925. 

  926. static void doAwrite (int argc, char *argv [])

  927. {

  928.   int pin, val ;

  929. 

  930.   if (argc != 4)

  931.   {

  932.     fprintf (stderr, "Usage: %s awrite pin value\n", argv [0]) ;

  933.     exit (1) ;

  934.   }

  935. 

  936.   pin = atoi (argv [2]) ;

  937. 

  938.   val = atoi (argv [3]) ;

  939. 

  940.   analogWrite (pin, val) ;

  941. }

  942. 

  943. 

  944. /*

  945.  * doWriteByte:

  946.  *	gpio write value

  947.  *********************************************************************************

  948.  */

  949. 

  950. static void doWriteByte (int argc, char *argv [])

  951. {

  952.   int val ;

  953. 

  954.   if (argc != 3)

  955.   {

  956.     fprintf (stderr, "Usage: %s wb value\n", argv [0]) ;

  957.     exit (1) ;

  958.   }

  959. 

  960.   val = (int)strtol (argv [2], NULL, 0) ;

  961. 

  962.   digitalWriteByte (val) ;

  963. }

  964. 

  965. 

  966. /*

  967.  * doRead:

  968.  *	Read a pin and return the value

  969.  *********************************************************************************

  970.  */

  971. 

  972. void doRead (int argc, char *argv []) 

  973. {

  974.   int pin, val ;

  975. 

  976.   if (argc != 3)

  977.   {

  978.     fprintf (stderr, "Usage: %s read pin\n", argv [0]) ;

  979.     exit (1) ;

  980.   }

  981. 

  982.   pin = atoi (argv [2]) ;

  983.   val = digitalRead (pin) ;

  984. 

  985.   printf ("%s\n", val == 0 ? "0" : "1") ;

  986. }

  987. 

  988. 

  989. /*

  990.  * doAread:

  991.  *	Read an analog pin and return the value

  992.  *********************************************************************************

  993.  */

  994. 

  995. void doAread (int argc, char *argv []) 

  996. {

  997.   if (argc != 3)

  998.   {

  999.     fprintf (stderr, "Usage: %s aread pin\n", argv [0]) ;

  1000.     exit (1) ;

  1001.   }

  1002. 

  1003.   printf ("%d\n", analogRead (atoi (argv [2]))) ;

  1004. }

  1005. 

  1006. 

  1007. /*

  1008.  * doToggle:

  1009.  *	Toggle an IO pin

  1010.  *********************************************************************************

  1011.  */

  1012. 

  1013. void doToggle (int argc, char *argv [])

  1014. {

  1015.   int pin ;

  1016. 

  1017.   if (argc != 3)

  1018.   {

  1019.     fprintf (stderr, "Usage: %s toggle pin\n", argv [0]) ;

  1020.     exit (1) ;

  1021.   }

  1022. 

  1023.   pin = atoi (argv [2]) ;

  1024. 

  1025.   digitalWrite (pin, !digitalRead (pin)) ;

  1026. }

  1027. 

  1028. 

  1029. /*

  1030.  * doPwmTone:

  1031.  *	Output a tone in a PWM pin

  1032.  *********************************************************************************

  1033.  */

  1034. 

  1035. void doPwmTone (int argc, char *argv [])

  1036. {

  1037.   int pin, freq ;

  1038. 

  1039.   if (argc != 4)

  1040.   {

  1041.     fprintf (stderr, "Usage: %s pwmTone <pin> <freq>\n", argv [0]) ;

  1042.     exit (1) ;

  1043.   }

  1044. 

  1045.   pin = atoi (argv [2]) ;

  1046.   freq = atoi (argv [3]) ;

  1047. 

  1048.   pwmToneWrite (pin, freq) ;

  1049. }

  1050. 

  1051. 

  1052. /*

  1053.  * doClock:

  1054.  *	Output a clock on a pin

  1055.  *********************************************************************************

  1056.  */

  1057. 

  1058. void doClock (int argc, char *argv [])

  1059. {

  1060.   int pin, freq ;

  1061. 

  1062.   if (argc != 4)

  1063.   {

  1064.     fprintf (stderr, "Usage: %s clock <pin> <freq>\n", argv [0]) ;

  1065.     exit (1) ;

  1066.   }

  1067. 

  1068.   pin = atoi (argv [2]) ;

  1069. 

  1070.   freq = atoi (argv [3]) ;

  1071. 

  1072.   gpioClockSet (pin, freq) ;

  1073. }

  1074. 

  1075. 

  1076. /*

  1077.  * doPwm:

  1078.  *	Output a PWM value on a pin

  1079.  *********************************************************************************

  1080.  */

  1081. 

  1082. void doPwm (int argc, char *argv [])

  1083. {

  1084.   int pin, val ;

  1085. 

  1086.   if (argc != 4)

  1087.   {

  1088.     fprintf (stderr, "Usage: %s pwm <pin> <value>\n", argv [0]) ;

  1089.     exit (1) ;

  1090.   }

  1091. 

  1092.   pin = atoi (argv [2]) ;

  1093. 

  1094.   val = atoi (argv [3]) ;

  1095. 

  1096.   pwmWrite (pin, val) ;

  1097. }

  1098. 

  1099. 

  1100. /*

  1101.  * doPwmMode: doPwmRange: doPwmClock:

  1102.  *	Change the PWM mode, range and clock divider values

  1103.  *********************************************************************************

  1104.  */

  1105. 

  1106. static void doPwmMode (int mode)

  1107. {

  1108.   pwmSetMode (mode) ;

  1109. }

  1110. 

  1111. static void doPwmRange (int argc, char *argv [])

  1112. {

  1113.   unsigned int range ;

  1114. 

  1115.   if (argc != 3)

  1116.   {

  1117.     fprintf (stderr, "Usage: %s pwmr <range>\n", argv [0]) ;

  1118.     exit (1) ;

  1119.   }

  1120. 

  1121.   range = (unsigned int)strtoul (argv [2], NULL, 10) ;

  1122. 

  1123.   if (range == 0)

  1124.   {

  1125.     fprintf (stderr, "%s: range must be > 0\n", argv [0]) ;

  1126.     exit (1) ;

  1127.   }

  1128. 

  1129.   pwmSetRange (range) ;

  1130. }

  1131. 

  1132. static void doPwmClock (int argc, char *argv [])

  1133. {

  1134.   unsigned int clock ;

  1135. 

  1136.   if (argc != 3)

  1137.   {

  1138.     fprintf (stderr, "Usage: %s pwmc <clock>\n", argv [0]) ;

  1139.     exit (1) ;

  1140.   }

  1141. 

  1142.   clock = (unsigned int)strtoul (argv [2], NULL, 10) ;

  1143. 

  1144.   if ((clock < 1) || (clock > 4095))

  1145.   {

  1146.     fprintf (stderr, "%s: clock must be between 0 and 4096\n", argv [0]) ;

  1147.     exit (1) ;

  1148.   }

  1149. 

  1150.   pwmSetClock (clock) ;

  1151. }

  1152. 

  1153. 

  1154. /*

  1155.  * doVersion:

  1156.  *	Handle the ever more complicated version command and print out

  1157.  *	some usefull information.

  1158.  *********************************************************************************

  1159.  */

  1160. 

  1161. static void doVersion (char *argv [])

  1162. {

  1163.   int model, rev, mem, maker, warranty ;

  1164.   struct stat statBuf ;

  1165. 

  1166.   printf ("gpio version: %s\n", VERSION) ;

  1167.   printf ("Copyright (c) 2012-2015 Gordon Henderson\n") ;

  1168.   printf ("This is free software with ABSOLUTELY NO WARRANTY.\n") ;

  1169.   printf ("For details type: %s -warranty\n", argv [0]) ;

  1170.   printf ("\n") ;

  1171.   piBoardId (&model, &rev, &mem, &maker, &warranty) ;

  1172. 

  1173.   printf ("Raspberry Pi Details:\n") ;

  1174.   printf ("  Type: %s, Revision: %s, Memory: %dMB, Maker: %s %s\n", 

  1175.       piModelNames [model], piRevisionNames [rev], piMemorySize [mem], piMakerNames [maker], warranty ? "[Out of Warranty]" : "") ;

  1176. 

  1177. // Check for device tree

  1178. 

  1179.   if (stat ("/proc/device-tree", &statBuf) == 0)	// We're on a devtree system ...

  1180.     printf ("  * Device tree is enabled.\n") ;

  1181. 

  1182.   if (stat ("/dev/gpiomem", &statBuf) == 0)		// User level GPIO is GO

  1183.   {

  1184.     printf ("  * This Raspberry Pi supports user-level GPIO access.\n") ;

  1185.     printf ("    -> See the man-page for more details\n") ;

  1186.     printf ("    -> ie. export WIRINGPI_GPIOMEM=1\n") ;

  1187.   }

  1188.   else

  1189.     printf ("  * Root or sudo required for GPIO access.\n") ;

  1190. }

  1191. 

  1192. 

  1193. /*

  1194.  * main:

  1195.  *	Start here

  1196.  *********************************************************************************

  1197.  */

  1198. 

  1199. int main (int argc, char *argv [])

  1200. {

  1201.   int i ;

  1202. 

  1203.   if (getenv ("WIRINGPI_DEBUG") != NULL)

  1204.   {

  1205.     printf ("gpio: wiringPi debug mode enabled\n") ;

  1206.     wiringPiDebug = TRUE ;

  1207.   }

  1208. 

  1209.   if (argc == 1)

  1210.   {

  1211.     fprintf (stderr, "%s\n", usage) ;

  1212.     return 1 ;

  1213.   }

  1214. 

  1215. // Help

  1216. 

  1217.   if (strcasecmp (argv [1], "-h") == 0)

  1218.   {

  1219.     printf ("%s: %s\n", argv [0], usage) ;

  1220.     return 0 ;

  1221.   }

  1222. 

  1223. // Version & Warranty

  1224. //	Wish I could remember why I have both -R and -V ...

  1225. 

  1226.   if ((strcmp (argv [1], "-R") == 0) || (strcmp (argv [1], "-V") == 0))

  1227.   {

  1228.     printf ("%d\n", piBoardRev ()) ;

  1229.     return 0 ;

  1230.   }

  1231. 

  1232. // Version and information

  1233. 

  1234.   if (strcmp (argv [1], "-v") == 0)

  1235.   {

  1236.     doVersion (argv) ;

  1237.     return 0 ;

  1238.   }

  1239. 

  1240.   if (strcasecmp (argv [1], "-warranty") == 0)

  1241.   {

  1242.     printf ("gpio version: %s\n", VERSION) ;

  1243.     printf ("Copyright (c) 2012-2015 Gordon Henderson\n") ;

  1244.     printf ("\n") ;

  1245.     printf ("    This program is free software; you can redistribute it and/or modify\n") ;

  1246.     printf ("    it under the terms of the GNU Leser General Public License as published\n") ;

  1247.     printf ("    by the Free Software Foundation, either version 3 of the License, or\n") ;

  1248.     printf ("    (at your option) any later version.\n") ;

  1249.     printf ("\n") ;

  1250.     printf ("    This program is distributed in the hope that it will be useful,\n") ;

  1251.     printf ("    but WITHOUT ANY WARRANTY; without even the implied warranty of\n") ;

  1252.     printf ("    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n") ;

  1253.     printf ("    GNU Lesser General Public License for more details.\n") ;

  1254.     printf ("\n") ;

  1255.     printf ("    You should have received a copy of the GNU Lesser General Public License\n") ;

  1256.     printf ("    along with this program. If not, see <http://www.gnu.org/licenses/>.\n") ;

  1257.     printf ("\n") ;

  1258.     return 0 ;

  1259.   }

  1260. 

  1261.   if (geteuid () != 0)

  1262.   {

  1263.     fprintf (stderr, "%s: Must be root to run. Program should be suid root. This is an error.\n", argv [0]) ;

  1264.     return 1 ;

  1265.   }

  1266. 

  1267. // Initial test for /sys/class/gpio operations:

  1268. 

  1269.   /**/ if (strcasecmp (argv [1], "exports"    ) == 0)	{ doExports     (argc, argv) ;	return 0 ; }

  1270.   else if (strcasecmp (argv [1], "export"     ) == 0)	{ doExport      (argc, argv) ;	return 0 ; }

  1271.   else if (strcasecmp (argv [1], "edge"       ) == 0)	{ doEdge        (argc, argv) ;	return 0 ; }

  1272.   else if (strcasecmp (argv [1], "unexport"   ) == 0)	{ doUnexport    (argc, argv) ;	return 0 ; }

  1273.   else if (strcasecmp (argv [1], "unexportall") == 0)	{ doUnexportall (argv [0]) ;	return 0 ; }

  1274. 

  1275. // Check for load command:

  1276. 

  1277.   if (strcasecmp (argv [1], "load"   ) == 0)	{ doLoad   (argc, argv) ; return 0 ; }

  1278.   if (strcasecmp (argv [1], "unload" ) == 0)	{ doUnLoad (argc, argv) ; return 0 ; }

  1279. 

  1280. // Check for usb power command

  1281. 

  1282.   if (strcasecmp (argv [1], "usbp"   ) == 0)	{ doUsbP   (argc, argv) ; return 0 ; }

  1283. 

  1284. // Gertboard commands

  1285. 

  1286.   if (strcasecmp (argv [1], "gbr" ) == 0)	{ doGbr (argc, argv) ; return 0 ; }

  1287.   if (strcasecmp (argv [1], "gbw" ) == 0)	{ doGbw (argc, argv) ; return 0 ; }

  1288. 

  1289. // Check for allreadall command, force Gpio mode

  1290. 

  1291.   if (strcasecmp (argv [1], "allreadall") == 0)

  1292.   {

  1293.     wiringPiSetupGpio () ;

  1294.     doAllReadall      () ;

  1295.     return 0 ;

  1296.   }

  1297. 

  1298. // Check for -g argument

  1299. 

  1300.   /**/ if (strcasecmp (argv [1], "-g") == 0)

  1301.   {

  1302.     wiringPiSetupGpio () ;

  1303. 

  1304.     for (i = 2 ; i < argc ; ++i)

  1305.       argv [i - 1] = argv [i] ;

  1306.     --argc ;

  1307.     wpMode = WPI_MODE_GPIO ;

  1308.   }

  1309. 

  1310. // Check for -1 argument

  1311. 

  1312.   else if (strcasecmp (argv [1], "-1") == 0)

  1313.   {

  1314.     wiringPiSetupPhys () ;

  1315. 

  1316.     for (i = 2 ; i < argc ; ++i)

  1317.       argv [i - 1] = argv [i] ;

  1318.     --argc ;

  1319.     wpMode = WPI_MODE_PHYS ;

  1320.   }

  1321. 

  1322. // Check for -p argument for PiFace

  1323. 

  1324.   else if (strcasecmp (argv [1], "-p") == 0)

  1325.   {

  1326.     piFaceSetup (200) ;

  1327. 

  1328.     for (i = 2 ; i < argc ; ++i)

  1329.       argv [i - 1] = argv [i] ;

  1330.     --argc ;

  1331.     wpMode = WPI_MODE_PIFACE ;

  1332.   }

  1333. 

  1334. // Default to wiringPi mode

  1335. 

  1336.   else

  1337.   {

  1338.     wiringPiSetup () ;

  1339.     wpMode = WPI_MODE_PINS ;

  1340.   }

  1341. 

  1342. // Check for -x argument to load in a new extension

  1343. 

  1344.   if (strcasecmp (argv [1], "-x") == 0)

  1345.   {

  1346.     if (argc < 3)

  1347.     {

  1348.       fprintf (stderr, "%s: -x missing extension specification.\n", argv [0]) ;

  1349.       exit (EXIT_FAILURE) ;

  1350.     }

  1351. 

  1352.     if (!loadWPiExtension (argv [0], argv [2], TRUE))	// Prints its own error messages

  1353.       exit (EXIT_FAILURE) ;

  1354. 

  1355.     for (i = 3 ; i < argc ; ++i)

  1356.       argv [i - 2] = argv [i] ;

  1357.     argc -= 2 ;

  1358.   }

  1359. 

  1360.   if (argc <= 1)

  1361.   {

  1362.     fprintf (stderr, "%s: no command given\n", argv [0]) ;

  1363.     exit (EXIT_FAILURE) ;

  1364.   }

  1365. 

  1366. // Core wiringPi functions

  1367. 

  1368.   /**/ if (strcasecmp (argv [1], "mode"   ) == 0) doMode      (argc, argv) ;

  1369.   else if (strcasecmp (argv [1], "read"   ) == 0) doRead      (argc, argv) ;

  1370.   else if (strcasecmp (argv [1], "write"  ) == 0) doWrite     (argc, argv) ;

  1371.   else if (strcasecmp (argv [1], "pwm"    ) == 0) doPwm       (argc, argv) ;

  1372.   else if (strcasecmp (argv [1], "awrite" ) == 0) doAwrite    (argc, argv) ;

  1373.   else if (strcasecmp (argv [1], "aread"  ) == 0) doAread     (argc, argv) ;

  1374. 

  1375. // GPIO Nicies

  1376. 

  1377.   else if (strcasecmp (argv [1], "toggle" ) == 0) doToggle    (argc, argv) ;

  1378. 

  1379. // Pi Specifics

  1380. 

  1381.   else if (strcasecmp (argv [1], "pwm-bal"  ) == 0) doPwmMode    (PWM_MODE_BAL) ;

  1382.   else if (strcasecmp (argv [1], "pwm-ms"   ) == 0) doPwmMode    (PWM_MODE_MS) ;

  1383.   else if (strcasecmp (argv [1], "pwmr"     ) == 0) doPwmRange   (argc, argv) ;

  1384.   else if (strcasecmp (argv [1], "pwmc"     ) == 0) doPwmClock   (argc, argv) ;

  1385.   else if (strcasecmp (argv [1], "pwmTone"  ) == 0) doPwmTone    (argc, argv) ;

  1386.   else if (strcasecmp (argv [1], "drive"    ) == 0) doPadDrive   (argc, argv) ;

  1387.   else if (strcasecmp (argv [1], "readall"  ) == 0) doReadall    () ;

  1388.   else if (strcasecmp (argv [1], "nreadall" ) == 0) doReadall    () ;

  1389.   else if (strcasecmp (argv [1], "pins"     ) == 0) doPins       () ;

  1390.   else if (strcasecmp (argv [1], "i2cdetect") == 0) doI2Cdetect  (argc, argv) ;

  1391.   else if (strcasecmp (argv [1], "i2cd"     ) == 0) doI2Cdetect  (argc, argv) ;

  1392.   else if (strcasecmp (argv [1], "reset"    ) == 0) doReset      (argv [0]) ;

  1393.   else if (strcasecmp (argv [1], "wb"       ) == 0) doWriteByte  (argc, argv) ;

  1394.   else if (strcasecmp (argv [1], "clock"    ) == 0) doClock      (argc, argv) ;

  1395.   else if (strcasecmp (argv [1], "wfi"      ) == 0) doWfi        (argc, argv) ;

  1396.   else

  1397.   {

  1398.     fprintf (stderr, "%s: Unknown command: %s.\n", argv [0], argv [1]) ;

  1399.     exit (EXIT_FAILURE) ;

  1400.   }

  1401.   return 0 ;

  1402. }