--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/thermferm/units.c Fri Jul 04 23:37:53 2014 +0200
@@ -0,0 +1,200 @@
+/*****************************************************************************
+ * 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 "thermferm.h"
+
+
+extern int debug;
+extern sys_config Config;
+extern int my_shutdown;
+
+extern const char UNITMODE[5][8];
+
+
+
+int read_w1_28(char *address, int *val)
+{
+ char *device, line[60], *p = NULL;
+ FILE *fp;
+ int rc = 0;
+
+ device = xstrcpy((char *)"/sys/bus/w1/devices/");
+ device = xstrcat(device, address);
+ 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", val);
+ if (rc != 1) {
+ syslog(LOG_NOTICE, "sensor %s data parse error", address);
+ rc = 3;
+ }
+ } else {
+ syslog(LOG_NOTICE, "sensor %s CRC error", address);
+ rc = 1;
+ }
+ fclose(fp);
+ } else {
+ syslog(LOG_NOTICE, "sensor %s is missing", address);
+ rc = 2;
+ }
+
+ free(device);
+ device = NULL;
+
+ return rc;
+}
+
+
+
+#ifdef HAVE_WIRINGPI_H
+PI_THREAD (my_units_loop)
+#else
+void *my_units_loop(void *threadid)
+#endif
+{
+ units_list *unit;
+ int temp, deviation;
+
+ /*
+ * Initialize units for processing
+ */
+ for (unit = Config.units; unit; unit = unit->next) {
+ /*
+ * Safety, turn everything off
+ */
+ unit->heater_state = unit->cooler_state = unit->fan_state = unit->door_state = 0;
+ if (unit->profile && (int)unit->prof_started && (unit->mode == UNITMODE_PROFILE)) {
+ syslog(LOG_NOTICE, "Starting unit %s profile %s", unit->name, unit->profile);
+ } else if (unit->mode == UNITMODE_BEER) {
+ syslog(LOG_NOTICE, "Starting unit %s beer cooler at %.1f degrees", unit->name, unit->beer_set);
+ } else if (unit->mode == UNITMODE_FRIDGE) {
+ syslog(LOG_NOTICE, "Starting unit %s as refridgerator at %.1f degrees", unit->name, unit->fridge_set);
+ } else if (unit->mode == UNITMODE_NONE) {
+ syslog(LOG_NOTICE, "Starting unit %s in inactive state", unit->name);
+ } else {
+ syslog(LOG_NOTICE, "Starting unit %s in off state", unit->name);
+ }
+ }
+
+ syslog(LOG_NOTICE, "Thread my_units_loop started");
+ if (debug)
+ fprintf(stdout, "Thread my_units_loop started\n");
+
+ /*
+ * Loop forever until the external shutdown variable is set.
+ */
+ for (;;) {
+
+ if (my_shutdown)
+ break;
+
+ /*
+ * Update the state of all fermenter units
+ */
+ for (unit = Config.units; unit; unit = unit->next) {
+
+ if (my_shutdown)
+ break;
+
+ if (unit->air_address) {
+ if (read_w1_28(unit->air_address, &temp) == 0) {
+ /*
+ * 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 ((unit->air_temp == 0) ||
+ (unit->air_temp && (temp > (int)unit->air_temp - deviation) && (temp < ((int)unit->air_temp + deviation)))) {
+ unit->air_temp = temp;
+ } else {
+ syslog(LOG_NOTICE, "deviation error deviation=%d, old=%d new=%d", deviation, unit->air_temp, temp);
+ if (debug) {
+ fprintf(stdout, "deviation error deviation=%d, old=%d new=%d\n", deviation, unit->air_temp, temp);
+ }
+ }
+ }
+ }
+ if (my_shutdown)
+ break;
+
+ if (unit->beer_address) {
+ if (read_w1_28(unit->beer_address, &temp) == 0) {
+ deviation = 20000;
+ if ((unit->beer_temp == 0) ||
+ (unit->beer_temp && (temp > (int)unit->beer_temp - deviation) && (temp < ((int)unit->beer_temp + deviation)))) {
+ unit->beer_temp = temp;
+ } else {
+ syslog(LOG_NOTICE, "deviation error deviation=%d, old=%d new=%d", deviation, unit->beer_temp, temp);
+ if (debug) {
+ fprintf(stdout, "deviation error deviation=%d, old=%d new=%d\n", deviation, unit->beer_temp, temp);
+ }
+ }
+ }
+ }
+ if (my_shutdown)
+ break;
+
+
+ }
+ usleep(10000);
+ }
+
+ /*
+ * Stop units processing in a neat way
+ */
+ for (unit = Config.units; unit; unit = unit->next) {
+ /*
+ * Turn everything off
+ */
+ unit->heater_state = unit->cooler_state = unit->fan_state = unit->door_state = 0;
+ syslog(LOG_NOTICE, "Stopped unit %s mode %s", unit->name, UNITMODE[unit->mode]);
+ }
+
+ syslog(LOG_NOTICE, "Thread my_units_loop stopped");
+ if (debug)
+ fprintf(stdout, "Thread my_units_loop stopped\n");
+ return 0;
+}
+
+