Added program to switch baudrate of M-Bus slave (untested)

bin/Makefile.am

@@ -16,7 +16,8 @@ noinst_HEADERS			=
 bin_PROGRAMS			= mbus-tcp-scan mbus-tcp-request-data \
                           mbus-tcp-select-secondary mbus-tcp-scan-secondary \
                           mbus-serial-scan mbus-serial-request-data \
-                          mbus-serial-select-secondary mbus-serial-scan-secondary
+                          mbus-serial-select-secondary mbus-serial-scan-secondary \
+                          mbus-serial-switch-baudrate
 
 # tcp
 mbus_tcp_scan_LDFLAGS	= -L$(top_builddir)/mbus
@@ -52,3 +53,7 @@ mbus_serial_scan_secondary_LDFLAGS = -L$(top_builddir)/mbus
 mbus_serial_scan_secondary_LDADD   = -lmbus
 mbus_serial_scan_secondary_SOURCES = mbus-serial-scan-secondary.c
 
+mbus_serial_switch_baudrate_LDFLAGS = -L$(top_builddir)/mbus
+mbus_serial_switch_baudrate_LDADD   = -lmbus
+mbus_serial_switch_baudrate_SOURCES = mbus-serial-switch-baudrate.c
+

bin/mbus-serial-switch-baudrate.c

@@ -0,0 +1,90 @@
+//------------------------------------------------------------------------------
+// Copyright (C) 2010-2012, Robert Johansson and contributors, Raditex AB
+// All rights reserved.
+//
+// FreeSCADA 
+// http://www.FreeSCADA.com
+// freescada@freescada.com
+//
+// Contributors:
+// Large parts of this file was contributed by Stefan Wahren.
+//
+//------------------------------------------------------------------------------
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <stdio.h>
+#include <mbus/mbus.h>
+
+
+//------------------------------------------------------------------------------
+// Execution starts here:
+//------------------------------------------------------------------------------
+int
+main(int argc, char **argv)
+{
+    mbus_handle *handle;
+    mbus_frame reply;
+    char *device;
+    int address, ret;
+    int source_baudrate = 9600, target_baudrate;
+
+    if (argc == 4)
+    {
+        device = argv[1];
+        address = atoi(argv[2]);
+        target_baudrate = atoi(argv[3]);
+    }
+    else if (argc == 6 && strcmp(argv[1], "-b") == 0)
+    {
+        source_baudrate = atoi(argv[2]);
+        device = argv[3];
+        address = atoi(argv[4]);
+        target_baudrate = atoi(argv[5]);
+    }
+    else
+    {
+        fprintf(stderr, "usage: %s device address target-baudrate\n", argv[0]);
+        return 0;
+    }
+
+    if ((handle = mbus_connect_serial(device)) == NULL)
+    {
+        printf("Failed to setup connection to M-bus device: %s\n", mbus_error_str());
+        return -1;
+    }
+    
+    if (mbus_serial_set_baudrate(handle->m_serial_handle, source_baudrate) == -1)
+    {
+        printf("Failed to set baud rate.\n");
+        return -1;
+    }
+
+    if (mbus_send_switch_baudrate_frame(handle, address, target_baudrate) == -1)
+    {
+        printf("Failed to send switch baudrate frame: %s\n", mbus_error_str());
+        return -1; 
+    }
+
+    ret = mbus_recv_frame(handle, &reply);  
+    
+    if (ret == -1)
+    {
+        printf("No reply from device\n");
+        return -1;
+    }
+
+    if (mbus_frame_type(&reply) != MBUS_FRAME_TYPE_ACK)
+    {
+        printf("Unknown reply:\n");
+        mbus_frame_print(&reply);
+    }
+    
+    mbus_disconnect(handle);
+    return 0;
+}
+

mbus/mbus-protocol-aux.c

@@ -1253,6 +1253,70 @@ mbus_send_select_frame(mbus_handle * handle, const char *secondary_addr_str)
     return 0;
 }
 
+//------------------------------------------------------------------------------
+// send a user data packet from master to slave: the packet let the
+// adressed slave(s) switch to the given baudrate
+//------------------------------------------------------------------------------
+int
+mbus_send_switch_baudrate_frame(mbus_handle * handle, int address, int baudrate)
+{
+    int retval = 0;
+    int control_information = 0;
+    mbus_frame *frame;
+    
+    switch (baudrate)
+    {
+      case 300:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_300;
+        break;
+      case 600:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_600;
+        break;
+      case 1200:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_1200;
+        break;
+      case 2400:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_2400;
+        break;
+      case 4800:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_4800;
+        break;
+      case 9600:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_9600;
+        break;
+      case 19200:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_19200;
+        break;
+      case 38400:
+        control_information = MBUS_CONTROL_INFO_SET_BAUDRATE_38400;
+        break;
+      default:
+        MBUS_ERROR("%s: invalid baudrate %d\n", __PRETTY_FUNCTION__, baudrate);
+        return -1;
+    }
+    
+    frame = mbus_frame_new(MBUS_FRAME_TYPE_CONTROL);
+    
+    if (frame == NULL)
+    {
+        MBUS_ERROR("%s: failed to allocate mbus frame.\n", __PRETTY_FUNCTION__);
+        return -1;
+    }
+    
+    frame->control = MBUS_CONTROL_MASK_SND_UD | MBUS_CONTROL_MASK_DIR_M2S; 
+    frame->address = address;
+    frame->control_information = control_information;
+
+    if (mbus_send_frame(handle, frame) == -1)
+    {
+        MBUS_ERROR("%s: failed to send mbus frame.\n", __PRETTY_FUNCTION__);
+        retval = -1;
+    }
+
+    mbus_frame_free(frame);
+    return retval;
+}
+
 //------------------------------------------------------------------------------
 // send a request packet to from master to slave
 //------------------------------------------------------------------------------

mbus/mbus-protocol-aux.h

@@ -186,6 +186,17 @@ int mbus_send_frame(mbus_handle * handle, mbus_frame *frame);
  */
 int mbus_send_select_frame(mbus_handle * handle, const char *secondary_addr_str);
 
+/** 
+ * Sends switch baudrate frame using "unified" handle
+ * 
+ * @param handle   Initialized handle
+ * @param address  Address (0-255)
+ * @param baudrate Baudrate (300,600,1200,2400,4800,9600,19200,38400)
+ * 
+ * @return Zero when successful.
+ */
+int mbus_send_switch_baudrate_frame(mbus_handle * handle, int address, int baudrate);
+
 /** 
  * Sends data request frame to given slave using "unified" handle
  *