--- /dev/null
+/*
+ * extensions.c:
+ * Part of the GPIO program to test, peek, poke and otherwise
+ * noodle with the GPIO hardware on the Raspberry Pi.
+ * Copyright (c) 2012-2013 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 <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 <mcp23017.h>
+#include <mcp23s08.h>
+#include <mcp23s17.h>
+#include <sr595.h>
+
+#include "extensions.h"
+
+extern int wiringPiDebug ;
+
+#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) ;
+} ;
+
+
+/*
+ * extractInt:
+ * Check & return an integer at the given location (prefixed by a :)
+ *********************************************************************************
+ */
+
+static char *extractInt (char *progName, char *p, int *num)
+{
+ if (*p != ':')
+ {
+ fprintf (stderr, "%s: colon expected\n", progName) ;
+ return NULL ;
+ }
+
+ ++p ;
+
+ if (!isdigit (*p))
+ {
+ fprintf (stderr, "%s: digit expected\n", progName) ;
+ return NULL ;
+ }
+
+ *num = strtol (p, NULL, 0) ;
+ while (isdigit (*p))
+ ++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 < 0x03) || (i2c > 0x77))
+ {
+ fprintf (stderr, "%s: i2c address (0x%X) out of range\n", progName, i2c) ;
+ return FALSE ;
+ }
+
+ mcp23008Setup (pinBase, i2c) ;
+
+ return TRUE ;
+}
+
+
+/*
+ * doExtensionMcp23017:
+ * MCP23008 - 16-bit I2C GPIO expansion chip
+ * mcp23002: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))
+ {
+ fprintf (stderr, "%s: i2c address (0x%X) out of range\n", 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))
+ {
+ fprintf (stderr, "%s: SPI address (%d) out of range\n", progName, spi) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &port)) == NULL)
+ return FALSE ;
+
+ if ((port < 0) || (port > 7))
+ {
+ fprintf (stderr, "%s: port address (%d) out of range\n", 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))
+ {
+ fprintf (stderr, "%s: SPI address (%d) out of range\n", progName, spi) ;
+ return FALSE ;
+ }
+
+ if ((params = extractInt (progName, params, &port)) == NULL)
+ return FALSE ;
+
+ if ((port < 0) || (port > 7))
+ {
+ fprintf (stderr, "%s: port address (%d) out of range\n", 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))
+ {
+ fprintf (stderr, "%s: pin count (%d) out of range - 8-32 expected.\n", 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 ;
+}
+
+
+/*
+ * Function list
+ *********************************************************************************
+ */
+
+struct extensionFunctionStruct extensionFunctions [] =
+{
+ { "mcp23008", &doExtensionMcp23008 },
+ { "mcp23017", &doExtensionMcp23017 },
+ { "mcp23s08", &doExtensionMcp23s08 },
+ { "mcp23s17", &doExtensionMcp23s17 },
+ { "sr595", &doExtensionSr595 },
+ { NULL, NULL },
+} ;
+
+
+/*
+ * doExtension:
+ * Load in a wiringPi extension
+ *********************************************************************************
+ */
+
+int doExtension (char *progName, char *extensionData)
+{
+ char *p ;
+ char *extension = extensionData ;
+ struct extensionFunctionStruct *extensionFn ;
+ int pinBase = 0 ;
+
+// Get the extension extension name by finding the first colon
+
+ p = extension ;
+ while (*p != ':')
+ {
+ if (!*p) // ran out of characters
+ {
+ fprintf (stderr, "%s: extension name not terminated by a colon\n", progName) ;
+ return FALSE ;
+ }
+ ++p ;
+ }
+
+ *p++ = 0 ;
+
+ if (!isdigit (*p))
+ {
+ fprintf (stderr, "%s: pinBase number expected after extension name\n", progName) ;
+ return FALSE ;
+ }
+
+ while (isdigit (*p))
+ {
+ if (pinBase > 1000000000)
+ {
+ fprintf (stderr, "%s: pinBase too large\n", progName) ;
+ return FALSE ;
+ }
+
+ pinBase = pinBase * 10 + (*p - '0') ;
+ ++p ;
+ }
+
+ if (pinBase < 64)
+ {
+ fprintf (stderr, "%s: pinBase (%d) too small. Minimum is 64.\n", 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) ;
+ }
+
+ fprintf (stderr, "%s: extension %s not found\n", progName, extension) ;
+ return FALSE ;
+}
~ianmdlvl / wiringPi.git / blobdiff