diff -r dafbbd5e9922 -r f534ace74eea thermferm/sensors.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/thermferm/sensors.c	Sun May 18 21:24:55 2014 +0200
@@ -0,0 +1,135 @@
+/*****************************************************************************
+ * Copyright (C) 2014
+ *   
+ * Michiel Broek <mbroek at mbse dot eu>
+ *
+ * This file is part of the mbsePi-apps
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * mbsePi-apps 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
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with EC-65K; see the file COPYING.  If not, write to the Free
+ * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *****************************************************************************/
+
+#include "../lib/mbselib.h"
+#include "sensors.h"
+
+#ifdef HAVE_WIRINGPI_H
+
+
+extern bool		debug;
+extern sys_config	Config;
+extern int		my_shutdown;
+
+
+
+PI_THREAD (my_sensors_loop)
+{
+    w1_therm		*tmp1, *old1;
+    char		*device, line[60], *p = NULL;
+    FILE		*fp;
+    int			temp, rc, deviation;
+
+    syslog(LOG_NOTICE, "Thread my_sensors_loop started");
+    if (debug)
+	fprintf(stdout, "Thread my_sensors_loop started\n");
+
+    /*
+     * Loop forever until the external shutdown variable is set.
+     */
+    for (;;) {
+    	/*
+    	 * Here send our 1-wire sensors values
+    	 */
+    	for (tmp1 = Config.w1therms; tmp1; tmp1 = old1) {
+	    old1 = tmp1->next;
+
+	    if (my_shutdown) {
+		syslog(LOG_NOTICE, "Thread my_sensors_loop stopped");
+		if (debug)
+		    fprintf(stdout, "Thread my_sensors_loop stopped\n");
+	    	return 0;
+	    }
+
+	    /*
+	     * Build path to the on-wire sensor
+	     */
+	    device = xstrcpy((char *)"/sys/bus/w1/devices/");
+	    device = xstrcat(device, tmp1->master);
+	    device = xstrcat(device, (char *)"/");
+	    device = xstrcat(device, tmp1->name);
+	    device = xstrcat(device, (char *)"/w1_slave");
+
+	    /*
+	     * Read sensor data
+	     */
+	    if ((fp = fopen(device, "r"))) {
+		/*
+		 * The output looks like:
+		 * 72 01 4b 46 7f ff 0e 10 57 : crc=57 YES
+		 * 72 01 4b 46 7f ff 0e 10 57 t=23125
+		 */
+		fgets(line, 50, fp);
+		line[strlen(line)-1] = '\0';
+		if ((line[36] == 'Y') && (line[37] == 'E')) {
+		    /*
+		     * CRC is Ok, continue
+		     */
+		    fgets(line, 50, fp);
+		    line[strlen(line)-1] = '\0';
+		    strtok(line, (char *)"=");
+		    p = strtok(NULL, (char *)"=");
+		    rc = sscanf(p, "%d", &temp);
+		    if ((rc == 1) && (tmp1->lastval != temp)) {
+			/*
+			 * It is possible to have read errors or extreme values.
+			 * This can happen with bad connections so we compare the
+			 * value with the previous one. If the difference is too
+			 * much, we don't send that value. That also means that if
+			 * the next value is ok again, it will be marked invalid too.
+			 * Maximum error is 20 degrees for now.
+			 */
+			deviation = 20000;
+			if ( (tmp1->lastval == 0) ||
+			     (tmp1->lastval && (temp > (tmp1->lastval - deviation)) && (temp < (tmp1->lastval + deviation))) ) {
+			    /*
+			     * Temperature is changed and valid, set flag.
+			     */
+			    tmp1->update = TRUE;
+			} else {
+			    syslog(LOG_NOTICE, "deviation error deviation=%d, old=%d new=%d", deviation, tmp1->lastval, temp);
+			    if (debug) {
+				fprintf(stdout, "deviation error deviation=%d, old=%d new=%d\n", deviation, tmp1->lastval, temp);
+			    }
+			}
+			tmp1->lastval = temp;
+		    }
+		} else {
+		    syslog(LOG_NOTICE, "sensor %s/%s CRC error", tmp1->master, tmp1->name);
+		}
+		fclose(fp);
+		tmp1->present = 1;
+	    } else {
+		tmp1->present = 0;
+		if (debug)
+		    printf("sensor %s is missing\n", tmp1->name);
+	    }
+
+	    free(device);
+	    device = NULL;
+    	}
+    }
+}
+
+
+
+#endif