From a2b89c88185d680051076e9b341c8b8f6cf5b25d Mon Sep 17 00:00:00 2001
From: Jonathan McCrohan <jmccrohan@gmail.com>
Date: Sat, 15 Oct 2011 14:44:28 +0100
Subject: Add GPLv3 licence.

---
 modbuslog.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 modbuslog.c

(limited to 'modbuslog.c')

diff --git a/modbuslog.c b/modbuslog.c
new file mode 100644
index 0000000..a73dd94
--- /dev/null
+++ b/modbuslog.c
@@ -0,0 +1,117 @@
+/* 
+ * modbuslog
+ *
+ * Copyright (C) 2011 Jonathan McCrohan
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// gcc modbuslog.c -o modbuslog `pkg-config --libs --cflags libmodbus libconfig`
+
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <libconfig.h>
+#include <modbus.h>
+
+#define SLAVE_ID 1
+#define START_ADDRESS 0
+#define NUMBER_REGISTERS 14
+#define DEBUG 1
+
+int main(int argc, char *argv[])
+{
+
+const char *CONFIG_FILE = "modbuslog.cfg";
+
+ config_t cfg;
+ //config_setting_t *setting;
+
+ const char *modbus_device_address;
+ int modbus_baud_rate;
+ int modbus_data_bits;
+ const char *modbus_parity;
+ int modbus_stop_bits;
+
+ config_init(&cfg);
+
+
+  if(!config_read_file(&cfg, CONFIG_FILE))
+  {
+    fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
+            config_error_line(&cfg), config_error_text(&cfg));
+    config_destroy(&cfg);
+    fprintf(stderr, "Unable to find CONFIG_FILE.\n");
+    return -1;
+  }
+
+ modbus_t *ctx;
+ uint16_t tab_reg[64];
+ int rc;
+ int i;
+
+ if(!(config_lookup_string(&cfg, "modbus.device", &modbus_device_address)
+	&& config_lookup_int(&cfg, "modbus.baud", &modbus_baud_rate)
+	&& config_lookup_int(&cfg, "modbus.data_bits", &modbus_data_bits)
+	&& config_lookup_string(&cfg, "modbus.parity", &modbus_parity)
+	&& config_lookup_int(&cfg, "modbus.stop_bits", &modbus_stop_bits))
+){
+	fprintf(stderr, "Check modbus configuration in configuration file.\n");
+	return -1;
+}
+
+ if(DEBUG){
+  printf("%s %d %c %d %d\n",modbus_device_address, modbus_baud_rate, modbus_parity[0], modbus_data_bits, modbus_stop_bits);
+ }
+
+ctx = modbus_new_rtu(modbus_device_address, modbus_baud_rate, modbus_parity[0], modbus_data_bits, modbus_stop_bits);
+
+modbus_set_slave(ctx, SLAVE_ID);
+modbus_set_debug(ctx, DEBUG);
+
+if (ctx == NULL) {
+    fprintf(stderr, "Unable to create the libmodbus context\n");
+    return -1;
+}
+
+
+
+if (modbus_connect(ctx) == -1) {
+    fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
+    modbus_free(ctx);
+    return -1;
+}
+
+rc = modbus_read_input_registers(ctx, START_ADDRESS, NUMBER_REGISTERS, tab_reg);
+
+
+if (rc == -1) {
+    fprintf(stderr, "ERROR: %s\n", modbus_strerror(errno));
+    return -1;
+}
+
+
+for (i=0; i < rc; i=i+2) {
+    printf("reg[%d]=%d\n", i, tab_reg[i]+tab_reg[i+1]);
+}
+
+
+modbus_close(ctx);
+modbus_free(ctx);
+
+    return 0;
+}
-- 
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