Add option to set Silabs JLink VCP baud rate (#144)

Author: josesimoes

nanoFirmwareFlasher/Options.cs

@@ -179,6 +179,12 @@ public class Options
             HelpText = "ID of the J-Link device to update. If not specified the first connected J-Link device will be used.")]
         public string JLinkDeviceId { get; set; }
 
+        [Option(
+            "setvcpbr",
+            Required = false,
+            HelpText = "Set baud rate of J-Link Virtual COM Port. If a value is not specified it will use the default value for Wire Protocol.")]
+        public int? SetVcpBaudRate { get; set; }
+
         #endregion
 
 

nanoFirmwareFlasher/Program.cs

@@ -1148,8 +1148,14 @@ static async Task RunOptionsAndReturnExitCodeAsync(Options o)
                             Console.WriteLine($"Connected to J-Link device with ID {jlinkDevice.ProbeId}");
                         }
 
-                        // set VCP baud rate (if needed)
-                        _ = SilinkCli.SetVcpBaudRate(o.JLinkDeviceId is null ? connectedJLinkDevices.First() : "", _verbosityLevel);
+                        // set VCP baud rate (if requested)
+                        if (o.SetVcpBaudRate.HasValue)
+                        {
+                            _ = SilinkCli.SetVcpBaudRate(
+                                o.JLinkDeviceId is null ? connectedJLinkDevices.First() : "",
+                                o.SetVcpBaudRate.Value,
+                                _verbosityLevel);
+                        }
 
                         // set verbosity
                         jlinkDevice.Verbosity = _verbosityLevel;
@@ -1200,8 +1206,14 @@ static async Task RunOptionsAndReturnExitCodeAsync(Options o)
 
                         operationPerformed = true;
 
-                        // set VCP baud rate (if needed)
-                        _ = SilinkCli.SetVcpBaudRate(o.JLinkDeviceId is null ? connectedJLinkDevices.First() : "", _verbosityLevel);
+                        if (o.SetVcpBaudRate.HasValue)
+                        {
+                            // set VCP baud rate (if needed)
+                            _ = SilinkCli.SetVcpBaudRate(
+                                o.JLinkDeviceId is null ? connectedJLinkDevices.First() : "",
+                                o.SetVcpBaudRate.Value,
+                                _verbosityLevel);
+                        }
 
                         if (_exitCode != ExitCodes.OK)
                         {

nanoFirmwareFlasher/SilinkCli.cs

@@ -19,20 +19,22 @@ internal class SilinkCli
     {
         private const int SilinkTelnetPort = 49000;
         private const int SilinkAdminPort = SilinkTelnetPort + 2;
-        private const int TargetBaudRate = 921600;
+        private const int DefaultBaudRate = 921600;
 
         /// <summary>
         /// This will set the baud rate of the VCP in a Silabs Jlink board.
         /// Before setting the value the devices is queried and the new setting is applied only if needed.
         /// </summary>
         /// <param name="probeId">Id of the JLink probe to adjust the baud rate.</param>
+        /// <param name="baudRate">Value of baud rate to set.</param>
         /// <param name="verbosity">Verbosity level for the operation. <see cref="VerbosityLevel.Quiet"/> will be used if not specified.</param>
         /// <returns></returns>
         /// <remarks>
         /// Currently this operation is only supported in Windows machines.
         /// </remarks>
         public static ExitCodes SetVcpBaudRate(
             string probeId,
+            int baudRate,
             VerbosityLevel verbosity = VerbosityLevel.Quiet)
         {
             // check that we can run on this platform
@@ -50,6 +52,9 @@ public static ExitCodes SetVcpBaudRate(
                 return ExitCodes.E8002;
             }
 
+            // store baud rate value
+            int targetBaudRate = baudRate == 0 ? DefaultBaudRate : baudRate;
+
             Console.ForegroundColor = ConsoleColor.White;
 
             // launch silink 
@@ -101,12 +106,12 @@ public static ExitCodes SetVcpBaudRate(
                     const string regexPattern = "(?:Stored port speed  : )(?'baudrate'\\d+)";
 
                     var myRegex1 = new Regex(regexPattern, RegexOptions.Multiline);
-                    var currentBaud = myRegex1.Match(currentConfig);
+                    var currentVcomConfig = myRegex1.Match(currentConfig);
 
-                    if (currentBaud.Success)
+                    if (currentVcomConfig.Success)
                     {
                         // verify current setting
-                        if (int.TryParse(currentBaud.Groups["baudrate"].Value, out int baudRate) && baudRate == TargetBaudRate)
+                        if (int.TryParse(currentVcomConfig.Groups["baud rate"].Value, out int currentBaudRate) && currentBaudRate == targetBaudRate)
                         {
                             if (verbosity >= VerbosityLevel.Detailed)
                             {
@@ -131,7 +136,7 @@ public static ExitCodes SetVcpBaudRate(
                     Thread.Sleep(250);
 
                     // compose command
-                    buffer = Encoding.Default.GetBytes($"serial vcom config speed {TargetBaudRate}\r");
+                    buffer = Encoding.Default.GetBytes($"serial vcom config speed {targetBaudRate}\r");
                     silinkSocket.Send(buffer);
 
                     Thread.Sleep(250);
@@ -146,7 +151,7 @@ public static ExitCodes SetVcpBaudRate(
                         Console.WriteLine($"{opResult}");
                     }
 
-                    if (opResult.Contains($"Baudrate set to {TargetBaudRate} bps"))
+                    if (opResult.Contains($"Baudrate set to {targetBaudRate} bps"))
                     {
                         if (verbosity == VerbosityLevel.Normal)
                         {