ubxtool: Adds interface option for UBX-CFG-PRT.

The UBX-CFG-PRT command can specify any port, though it defaults to
the current port.  This option allows the port ID to be specified,
either as a name or as an integer.  At present, it only affects the
PRT preset, though it could be used for other port-related commands in
the future.

Note that the baud rate is only applicable to the UART port, so
there's no point in applying this to the -S option.

TESTED:
Tested on LEA-6S, LEA-M8F, LEA-M8T, and	LEA-M8N

2 files changed, 28 insertions, 5 deletions

diff --git a/man/ubxtool.xml b/man/ubxtool.xml
index 97a897bd..a23e6c08 100644
--- a/man/ubxtool.xml
+++ b/man/ubxtool.xml
@@ -33,6 +33,7 @@ BSD terms apply: see the file COPYING in the distribution root for details.
    <arg choice='opt'>-f <replaceable>file/device</replaceable>
    </arg>
    <arg choice='opt'>-h </arg>
+   <arg choice='opt'>-i <replaceable>interface</replaceable></arg>
    <arg choice='opt'>-m <replaceable>mode</replaceable></arg>
    <arg choice='opt'>-P <replaceable>protver</replaceable></arg>
    <arg choice='opt'>-p <replaceable>preset</replaceable></arg>
@@ -180,6 +181,13 @@ a usage message and exit.</para>
     </listitem>
    </varlistentry>
    <varlistentry>
+    <term>-i interface</term>
+    <listitem>
+     <para>Specifies interface (port) for port-related commands.
+</para>
+    </listitem>
+   </varlistentry>
+   <varlistentry>
     <term>-m mode</term>
     <listitem>
      <para>Sets optional mode parameter to a -p PRESET command.
diff --git a/ubxtool b/ubxtool
index cbcc3b31..ffb22f52 100755
--- a/ubxtool
+++ b/ubxtool
@@ -84,6 +84,8 @@ opts = {
     'input_speed': 9600,
     # default input wait time -w in seconds
     'input_wait': 2.0,
+    # interface for port-related commands
+    'interface': None,
     # optional mode to -p P
     'mode': None,
     # the name of an OAF file, extension .jpo
@@ -143,6 +145,7 @@ class ubx(object):
                 4: 'SPI',
                 0: 'DDC',  # The inappropriate name for i2c used in the spec
                 }
+    port_id_map = dict([x[::-1] for x in port_ids.items()])
 
     def ack_ack(self, buf):
         "UBX-ACK-ACK decode"
@@ -1946,17 +1949,25 @@ class ubx(object):
         gps_model.gps_send(6, 0x86, m_data)
 
     def send_cfg_prt(self):
-        "UBX-CFG-PRT, get I/O Port"
-        m_data = bytearray(0)
+        "UBX-CFG-PRT, get I/O Port settings"
+        port = opts['interface']
+        if port is None:
+            m_data = bytearray()
+        else:
+            m_data = bytearray([port])
         gps_model.gps_send(6, 0x0, m_data)
 
     def send_set_speed(self, speed):
         "UBX-CFG-PRT, set port"
 
+        # Note that this is only applicable to the UART port (1),
+        # so there's no need to pay attention to 'interface'.
+        # If there's any possibility for a receiver to have multiple
+        # UART ports, it's not mentioned in the doc.
+
         # FIXME!  Poll current masks, then adjust speed
         m_data = bytearray(20)
-        m_data[0] = 1             # port 1, UART 1
-        # m_data[0] = 3           # port 3, USB
+        m_data[0] = 1             # port 1, UART
         m_data[4] = 0xc0          # 8N1
         m_data[5] = 0x8           # 8N1
 
@@ -2390,6 +2401,7 @@ def usage():
           '       -f F          open F as file/device\n'
           '                     default: %s\n'
           '       -h            print help\n'
+          '       -i I          interface (port) for UBX-CFG-PRT\n'
           '       -m M          optional mode to -p P\n'
           '       -P P          Protocol version for sending commands\n'
           '                     default: %s\n'
@@ -2434,7 +2446,7 @@ else:
 
 try:
     (options, arguments) = getopt.getopt(options,
-                                         "?c:d:e:f:hm:rP:p:s:w:v:R:S:V")
+                                         "?c:d:e:f:hi:m:rP:p:s:w:v:R:S:V")
 except getopt.GetoptError as err:
     sys.stderr.write("%s: %s\n"
                      "Try '%s -h' for more information.\n" %
@@ -2452,6 +2464,9 @@ for (opt, val) in options:
         opts['input_file_name'] = val
     elif opt == '-h' or opt == '-?':
         usage()
+    elif opt == '-i':
+        valnum = gps_model.port_id_map.get(val.upper())
+        opts['interface'] = valnum if valnum is not None else int(val)
     elif opt == '-m':
         opts['mode'] = int(val)
     elif opt == '-P':