--- /dev/null
+/*
+ * extensions.c:
+ * Originally part of the GPIO program to test, peek, poke and otherwise
+ * noodle with the GPIO hardware on the Raspberry Pi.
+ * Now used as a general purpose library to allow systems to dynamically
+ * add in new devices into wiringPi at program run-time.
+ * Copyright (c) 2012-2015 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ * https://projects.drogon.net/raspberry-pi/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 <stdarg.h>
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include <wiringPi.h>
+
+#include "mcp23008.h"
+#include "mcp23016.h"
+#include "mcp23017.h"
+#include "mcp23s08.h"
+#include "mcp23s17.h"
+#include "sr595.h"
+#include "pcf8591.h"
+#include "pcf8574.h"
+#include "max31855.h"
+#include "max5322.h"
+#include "mcp3002.h"
+#include "mcp3004.h"
+#include "mcp4802.h"
+#include "mcp3422.h"
+#include "sn3218.h"
+#include "drcSerial.h"
+
+#include "wpiExtensions.h"
+
+extern int wiringPiDebug ;
+
+static int verbose ;
+static char errorMessage [1024] ;
+
+
+#ifndef TRUE
+# define TRUE (1==1)
+# define FALSE (1==2)
+#endif
+
+// Local structure to hold details
+
+struct extensionFunctionStruct
+{
+ const char *name ;
+ int (*function)(char *progName, int pinBase, char *params) ;
+} ;
+
+
+/*
+ * verbError:
+ * Convenient error handling
+ *********************************************************************************
+ */
+
+static void verbError (const char *message, ...)
+{
+ va_list argp ;
+ va_start (argp, message) ;
+ vsnprintf (errorMessage, 1023, message, argp) ;
+ va_end (argp) ;
+
+ if (verbose)
+ fprintf (stderr, "%s\n", errorMessage) ;
+}
+
+
+/*
+ * extractInt:
+ * Check & return an integer at the given location (prefixed by a :)
+ *********************************************************************************
+ */
+
+static char *extractInt (char *progName, char *p, int *num)
+{
+ if (*p != ':')
+ {
+ verbError ("%s: colon expected", progName) ;
+ return NULL ;
+ }
+
+ ++p ;
+
+ if (!isdigit (*p))
+ {
+ verbError ("%s: digit expected", progName) ;
+ return NULL ;
+ }
+
+ *num = strtol (p, NULL, 0) ;
+ while (isdigit (*p))
+ ++p ;
+
+ return p ;
+}
+
+
+/*
+ * extractStr:
+ * Check & return a string at the given location (prefixed by a :)
+ *********************************************************************************
+ */
+
+static char *extractStr (char *progName, char *p, char **str)
+{
+ char *q, *r ;
+
+ if (*p != ':')
+ {
+ verbError ("%s: colon expected", progName) ;
+ return NULL ;
+ }
+
+ ++p ;
+
+ if (!isprint (*p))
+ {
+ verbError ("%s: character expected", progName) ;
+ return NULL ;
+ }
+
+ q = p ;
+ while ((*q != 0) && (*q != ':'))
+ ++q ;
+
+ *str = r = calloc (q - p + 2, 1) ; // Zeros it
+
+ while (p != q)
+ *r++ = *p++ ;
+
+ return p ;
+}
+
+
+
+/*
+ * doExtensionMcp23008:
+ * MCP23008 - 8-bit I2C GPIO expansion chip
+ * mcp23002:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23008 (char *progName, int pinBase, char *params)
+{
+ int i2c ;
+
+ if ((params = extractInt (progName, params, &i2c)) == NULL)
+ return FALSE ;
+
+ if ((i2c < 0x01) || (i2c > 0x77))
+ {
+ verbError ("%s: i2c address (0x%X) out of range", progName, i2c) ;
+ return FALSE ;
+ }
+
+ mcp23008Setup (pinBase, i2c) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23016:
+ * MCP230016- 16-bit I2C GPIO expansion chip
+ * mcp23016:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23016 (char *progName, int pinBase, char *params)
+{
+ int i2c ;
+
+ if ((params = extractInt (progName, params, &i2c)) == NULL)
+ return FALSE ;
+
+ if ((i2c < 0x03) || (i2c > 0x77))
+ {
+ verbError ("%s: i2c address (0x%X) out of range", progName, i2c) ;
+ return FALSE ;
+ }
+
+ mcp23016Setup (pinBase, i2c) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23017:
+ * MCP230017- 16-bit I2C GPIO expansion chip
+ * mcp23017:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23017 (char *progName, int pinBase, char *params)
+{
+ int i2c ;
+
+ if ((params = extractInt (progName, params, &i2c)) == NULL)
+ return FALSE ;
+
+ if ((i2c < 0x03) || (i2c > 0x77))
+ {
+ verbError ("%s: i2c address (0x%X) out of range", progName, i2c) ;
+ return FALSE ;
+ }
+
+ mcp23017Setup (pinBase, i2c) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23s08:
+ * MCP23s08 - 8-bit SPI GPIO expansion chip
+ * mcp23s08:base:spi:port
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23s08 (char *progName, int pinBase, char *params)
+{
+ int spi, port ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI address (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &port)) == NULL)
+ return FALSE ;
+
+ if ((port < 0) || (port > 7))
+ {
+ verbError ("%s: port address (%d) out of range", progName, port) ;
+ return FALSE ;
+ }
+
+ mcp23s08Setup (pinBase, spi, port) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23s17:
+ * MCP23s17 - 16-bit SPI GPIO expansion chip
+ * mcp23s17:base:spi:port
+ *********************************************************************************
+ */
+
+static int doExtensionMcp23s17 (char *progName, int pinBase, char *params)
+{
+ int spi, port ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI address (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &port)) == NULL)
+ return FALSE ;
+
+ if ((port < 0) || (port > 7))
+ {
+ verbError ("%s: port address (%d) out of range", progName, port) ;
+ return FALSE ;
+ }
+
+ mcp23s17Setup (pinBase, spi, port) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionSr595:
+ * Shift Register 74x595
+ * sr595:base:pins:data:clock:latch
+ *********************************************************************************
+ */
+
+static int doExtensionSr595 (char *progName, int pinBase, char *params)
+{
+ int pins, data, clock, latch ;
+
+// Extract pins
+
+ if ((params = extractInt (progName, params, &pins)) == NULL)
+ return FALSE ;
+
+ if ((pins < 8) || (pins > 32))
+ {
+ verbError ("%s: pin count (%d) out of range - 8-32 expected.", progName, pins) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &data)) == NULL)
+ return FALSE ;
+
+ if ((params = extractInt (progName, params, &clock)) == NULL)
+ return FALSE ;
+
+ if ((params = extractInt (progName, params, &latch)) == NULL)
+ return FALSE ;
+
+ sr595Setup (pinBase, pins, data, clock, latch) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionPcf8574:
+ * Digital IO (Crude!)
+ * pcf8574:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionPcf8574 (char *progName, int pinBase, char *params)
+{
+ int i2c ;
+
+ if ((params = extractInt (progName, params, &i2c)) == NULL)
+ return FALSE ;
+
+ if ((i2c < 0x03) || (i2c > 0x77))
+ {
+ verbError ("%s: i2c address (0x%X) out of range", progName, i2c) ;
+ return FALSE ;
+ }
+
+ pcf8574Setup (pinBase, i2c) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionPcf8591:
+ * Analog IO
+ * pcf8591:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionPcf8591 (char *progName, int pinBase, char *params)
+{
+ int i2c ;
+
+ if ((params = extractInt (progName, params, &i2c)) == NULL)
+ return FALSE ;
+
+ if ((i2c < 0x03) || (i2c > 0x77))
+ {
+ verbError ("%s: i2c address (0x%X) out of range", progName, i2c) ;
+ return FALSE ;
+ }
+
+ pcf8591Setup (pinBase, i2c) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMax31855:
+ * Analog IO
+ * max31855:base:spiChan
+ *********************************************************************************
+ */
+
+static int doExtensionMax31855 (char *progName, int pinBase, char *params)
+{
+ int spi ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI channel (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ max31855Setup (pinBase, spi) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp3002:
+ * Analog IO
+ * mcp3002:base:spiChan
+ *********************************************************************************
+ */
+
+static int doExtensionMcp3002 (char *progName, int pinBase, char *params)
+{
+ int spi ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI channel (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ mcp3002Setup (pinBase, spi) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp3004:
+ * Analog IO
+ * mcp3004:base:spiChan
+ *********************************************************************************
+ */
+
+static int doExtensionMcp3004 (char *progName, int pinBase, char *params)
+{
+ int spi ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI channel (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ mcp3004Setup (pinBase, spi) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMax5322:
+ * Analog O
+ * max5322:base:spiChan
+ *********************************************************************************
+ */
+
+static int doExtensionMax5322 (char *progName, int pinBase, char *params)
+{
+ int spi ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI channel (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ max5322Setup (pinBase, spi) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp4802:
+ * Analog IO
+ * mcp4802:base:spiChan
+ *********************************************************************************
+ */
+
+static int doExtensionMcp4802 (char *progName, int pinBase, char *params)
+{
+ int spi ;
+
+ if ((params = extractInt (progName, params, &spi)) == NULL)
+ return FALSE ;
+
+ if ((spi < 0) || (spi > 1))
+ {
+ verbError ("%s: SPI channel (%d) out of range", progName, spi) ;
+ return FALSE ;
+ }
+
+ mcp4802Setup (pinBase, spi) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionSn3218:
+ * Analog Output (LED Driver)
+ * sn3218:base
+ *********************************************************************************
+ */
+
+static int doExtensionSn3218 (char *progName, int pinBase, char *params)
+{
+ sn3218Setup (pinBase) ;
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp3422:
+ * Analog IO
+ * mcp3422:base:i2cAddr
+ *********************************************************************************
+ */
+
+static int doExtensionMcp3422 (char *progName, int pinBase, char *params)
+{
+ int i2c, sampleRate, gain ;
+
+ if ((params = extractInt (progName, params, &i2c)) == NULL)
+ return FALSE ;
+
+ if ((i2c < 0x03) || (i2c > 0x77))
+ {
+ verbError ("%s: i2c address (0x%X) out of range", progName, i2c) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &sampleRate)) == NULL)
+ return FALSE ;
+
+ if ((sampleRate < 0) || (sampleRate > 3))
+ {
+ verbError ("%s: sample rate (%d) out of range", progName, sampleRate) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &gain)) == NULL)
+ return FALSE ;
+
+ if ((gain < 0) || (gain > 3))
+ {
+ verbError ("%s: gain (%d) out of range", progName, gain) ;
+ return FALSE ;
+ }
+
+ mcp3422Setup (pinBase, i2c, sampleRate, gain) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionDrcS:
+ * Interface to a DRC Serial system
+ * drcs:base:pins:serialPort:baud
+ *********************************************************************************
+ */
+
+static int doExtensionDrcS (char *progName, int pinBase, char *params)
+{
+ char *port ;
+ int pins, baud ;
+
+ if ((params = extractInt (progName, params, &pins)) == NULL)
+ return FALSE ;
+
+ if ((pins < 1) || (pins > 100))
+ {
+ verbError ("%s: pins (%d) out of range (2-100)", progName, pins) ;
+ return FALSE ;
+ }
+
+ if ((params = extractStr (progName, params, &port)) == NULL)
+ return FALSE ;
+
+ if (strlen (port) == 0)
+ {
+ verbError ("%s: serial port device name required", progName) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &baud)) == NULL)
+ return FALSE ;
+
+ if ((baud < 1) || (baud > 4000000))
+ {
+ verbError ("%s: baud rate (%d) out of range", progName, baud) ;
+ return FALSE ;
+ }
+
+ drcSetupSerial (pinBase, pins, port, baud) ;
+
+ return TRUE ;
+}
+
+
+
+/*
+ * Function list
+ *********************************************************************************
+ */
+
+static struct extensionFunctionStruct extensionFunctions [] =
+{
+ { "mcp23008", &doExtensionMcp23008 },
+ { "mcp23016", &doExtensionMcp23016 },
+ { "mcp23017", &doExtensionMcp23017 },
+ { "mcp23s08", &doExtensionMcp23s08 },
+ { "mcp23s17", &doExtensionMcp23s17 },
+ { "sr595", &doExtensionSr595 },
+ { "pcf8574", &doExtensionPcf8574 },
+ { "pcf8591", &doExtensionPcf8591 },
+ { "mcp3002", &doExtensionMcp3002 },
+ { "mcp3004", &doExtensionMcp3004 },
+ { "mcp4802", &doExtensionMcp4802 },
+ { "mcp3422", &doExtensionMcp3422 },
+ { "max31855", &doExtensionMax31855 },
+ { "max5322", &doExtensionMax5322 },
+ { "sn3218", &doExtensionSn3218 },
+ { "drcs", &doExtensionDrcS },
+ { NULL, NULL },
+} ;
+
+
+/*
+ * loadWPiExtension:
+ * Load in a wiringPi extension
+ *********************************************************************************
+ */
+
+int loadWPiExtension (char *progName, char *extensionData, int printErrors)
+{
+ char *p ;
+ char *extension = extensionData ;
+ struct extensionFunctionStruct *extensionFn ;
+ int pinBase = 0 ;
+
+ verbose = printErrors ;
+
+// Get the extension extension name by finding the first colon
+
+ p = extension ;
+ while (*p != ':')
+ {
+ if (!*p) // ran out of characters
+ {
+ verbError ("%s: extension name not terminated by a colon", progName) ;
+ return FALSE ;
+ }
+ ++p ;
+ }
+
+ *p++ = 0 ;
+
+ if (!isdigit (*p))
+ {
+ verbError ("%s: pinBase number expected after extension name", progName) ;
+ return FALSE ;
+ }
+
+ while (isdigit (*p))
+ {
+ if (pinBase > 1000000000)
+ {
+ verbError ("%s: pinBase too large", progName) ;
+ return FALSE ;
+ }
+
+ pinBase = pinBase * 10 + (*p - '0') ;
+ ++p ;
+ }
+
+ if (pinBase < 64)
+ {
+ verbError ("%s: pinBase (%d) too small. Minimum is 64.", progName, pinBase) ;
+ return FALSE ;
+ }
+
+// Search for extensions:
+
+ for (extensionFn = extensionFunctions ; extensionFn->name != NULL ; ++extensionFn)
+ {
+ if (strcmp (extensionFn->name, extension) == 0)
+ return extensionFn->function (progName, pinBase, p) ;
+ }
+
+ verbError ("%s: extension %s not found", progName, extension) ;
+ return FALSE ;
+}
~ianmdlvl / wiringPi.git / blobdiff