I’m running the UART loopback program provided in the e-Book on my Fez Panda.
However whenever it encounters the UART.Read() line it does not progress further in the code (yes I have a wire shorting Tx and Rx). I found this by running Debug.Print statements. Any idea how I can debug this? I checked that the references to Microsoft.SPOT.Hardware.SerialPort was added for System.IO.Ports, and I’m also able to run the LED blinking example program in the same project space.
Edit: updated topic to say solved
I keep forgetting about fixing that example. I will look into a fix tomorrow
User_5
December 23, 2010, 4:53pm
3
It was throwing an exception. We updated the exmaple…
Thanks for investigating this! I’ll be able to try it out again the middle of next week. Have a nice holiday
When I run the program, at the line UART.ReadTimeout = 0; I get the error window popup:
“An unhandled exception of type ‘System.InvalidOperationException’ occurred in Microsoft.SPOT.Hardware.SerialPort.dll”.
It has the options continue and break. If I click continue I have the following in my Debug window:
Rebooting...
Found debugger!
Create TS.
Loading start at 4e13c, end 56314
Attaching file.
Assembly: mscorlib (4.1.2821.0) (3880 RAM - 33236 ROM - 19134 METADATA)
AssemblyRef = 0 bytes ( 0 elements)
TypeRef = 0 bytes ( 0 elements)
FieldRef = 0 bytes ( 0 elements)
MethodRef = 0 bytes ( 0 elements)
TypeDef = 1112 bytes ( 139 elements)
FieldDef = 272 bytes ( 135 elements)
MethodDef = 1572 bytes ( 786 elements)
Attributes = 0 bytes ( 0 elements)
TypeSpec = 16 bytes ( 4 elements)
Resources = 232 bytes ( 29 elements)
Resources Files = 16 bytes ( 2 elements)
Resources Data = 437 bytes
Strings = 1551 bytes
Signatures = 2126 bytes
ByteCode = 11702 bytes
Loading Deployment Assemblies.
Attaching deployed file.
Assembly: Microsoft.SPOT.Hardware.SerialPort (4.1.2821.0) (508 RAM - 3440 ROM - 1527 METADATA)
AssemblyRef = 8 bytes ( 2 elements)
TypeRef = 96 bytes ( 24 elements)
FieldRef = 0 bytes ( 0 elements)
MethodRef = 80 bytes ( 20 elements)
TypeDef = 16 bytes ( 2 elements)
FieldDef = 32 bytes ( 16 elements)
MethodDef = 92 bytes ( 46 elements)
Attributes = 0 bytes ( 0 elements)
TypeSpec = 0 bytes ( 0 elements)
Resources = 0 bytes ( 0 elements)
Resources Files = 0 bytes ( 0 elements)
Resources Data = 0 bytes
Strings = 667 bytes
Signatures = 239 bytes
ByteCode = 1118 bytes
Attaching deployed file.
Assembly: Scratchpad (1.0.0.0) (328 RAM - 1344 ROM - 566 METADATA)
AssemblyRef = 12 bytes ( 3 elements)
TypeRef = 56 bytes ( 14 elements)
FieldRef = 0 bytes ( 0 elements)
MethodRef = 76 bytes ( 19 elements)
TypeDef = 24 bytes ( 3 elements)
FieldDef = 4 bytes ( 2 elements)
MethodDef = 12 bytes ( 5 elements)
Attributes = 0 bytes ( 0 elements)
TypeSpec = 0 bytes ( 0 elements)
Resources = 16 bytes ( 2 elements)
Resources Files = 8 bytes ( 1 elements)
Resources Data = 13 bytes
Strings = 274 bytes
Signatures = 98 bytes
ByteCode = 317 bytes
Attaching deployed file.
Assembly: Microsoft.SPOT.Hardware (4.1.2821.0) (1752 RAM - 11440 ROM - 7371 METADATA)
AssemblyRef = 8 bytes ( 2 elements)
TypeRef = 124 bytes ( 31 elements)
FieldRef = 24 bytes ( 6 elements)
MethodRef = 120 bytes ( 30 elements)
TypeDef = 496 bytes ( 62 elements)
FieldDef = 176 bytes ( 88 elements)
MethodDef = 444 bytes ( 222 elements)
Attributes = 0 bytes ( 0 elements)
TypeSpec = 0 bytes ( 0 elements)
Resources = 0 bytes ( 0 elements)
Resources Files = 0 bytes ( 0 elements)
Resources Data = 0 bytes
Strings = 1329 bytes
Signatures = 1067 bytes
ByteCode = 2611 bytes
Attaching deployed file.
Assembly: FEZPanda_GHIElectronics.NETMF.FEZ (4.1.3.0) (380 RAM - 1332 ROM - 729 METADATA)
AssemblyRef = 12 bytes ( 3 elements)
TypeRef = 68 bytes ( 17 elements)
FieldRef = 0 bytes ( 0 elements)
MethodRef = 40 bytes ( 10 elements)
TypeDef = 88 bytes ( 11 elements)
FieldDef = 16 bytes ( 8 elements)
MethodDef = 12 bytes ( 5 elements)
Attributes = 0 bytes ( 0 elements)
TypeSpec = 0 bytes ( 0 elements)
Resources = 16 bytes ( 2 elements)
Resources Files = 8 bytes ( 1 elements)
Resources Data = 13 bytes
Strings = 270 bytes
Signatures = 69 bytes
ByteCode = 146 bytes
Attaching deployed file.
Assembly: Microsoft.SPOT.Native (4.1.2821.0) (1144 RAM - 6516 ROM - 4479 METADATA)
AssemblyRef = 4 bytes ( 1 elements)
TypeRef = 80 bytes ( 20 elements)
FieldRef = 0 bytes ( 0 elements)
MethodRef = 60 bytes ( 15 elements)
TypeDef = 336 bytes ( 42 elements)
FieldDef = 192 bytes ( 95 elements)
MethodDef = 224 bytes ( 111 elements)
Attributes = 48 bytes ( 6 elements)
TypeSpec = 0 bytes ( 0 elements)
Resources = 72 bytes ( 9 elements)
Resources Files = 8 bytes ( 1 elements)
Resources Data = 747 bytes
Strings = 648 bytes
Signatures = 595 bytes
ByteCode = 418 bytes
Resolving.
Total: (6804 RAM - 57308 ROM - 33806 METADATA)
AssemblyRef = 44 bytes ( 11 elements)
TypeRef = 424 bytes ( 106 elements)
FieldRef = 24 bytes ( 6 elements)
MethodRef = 376 bytes ( 94 elements)
TypeDef = 2072 bytes ( 259 elements)
FieldDef = 692 bytes ( 344 elements)
MethodDef = 2356 bytes ( 1175 elements)
DebuggingInfo = 1188 bytes
Attributes = 48 bytes ( 6 elements)
TypeSpec = 16 bytes ( 4 elements)
Resources Files = 120 bytes ( 5 elements)
Resources = 336 bytes ( 42 elements)
Resources Data = 1210 bytes
Strings = 4739 bytes
Signatures = 4194 bytes
ByteCode = 16312 bytes
The debugging target runtime is loading the application assemblies and starting execution.
Ready.
'Microsoft.SPOT.Debugger.CorDebug.dll' (Managed): Loaded 'C:\Program Files\Microsoft .NET Micro Framework\v4.1\Assemblies\le\mscorlib.dll', Symbols loaded.
'Microsoft.SPOT.Debugger.CorDebug.dll' (Managed): Loaded 'C:\Program Files\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Native.dll', Symbols loaded.
'Microsoft.SPOT.Debugger.CorDebug.dll' (Managed): Loaded 'C:\Program Files\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Hardware.dll', Symbols loaded.
'Microsoft.SPOT.Debugger.CorDebug.dll' (Managed): Loaded 'C:\Program Files\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Hardware.SerialPort.dll', Symbols loaded.
'Microsoft.SPOT.Debugger.CorDebug.dll' (Managed): Loaded 'C:\Documents and Settings\p.nanda\my documents\visual studio 2010\Projects\Scratchpad\Scratchpad\bin\Debug\le\Scratchpad.exe', Symbols loaded.
'Microsoft.SPOT.Debugger.CorDebug.dll' (Managed): Loaded 'C:\Program Files\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\FEZPanda_GHIElectronics.NETMF.FEZ.dll'
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
COM port opened
#### Exception System.InvalidOperationException - 0x00000000 (1) ####
#### Message:
#### System.IO.Ports.SerialPort::set_ReadTimeout [IP: 0009] ####
#### MFConsoleApplication1.Program::Main [IP: 0035] ####
A first chance exception of type 'System.InvalidOperationException' occurred in Microsoft.SPOT.Hardware.SerialPort.dll
An unhandled exception of type 'System.InvalidOperationException' occurred in Microsoft.SPOT.Hardware.SerialPort.dll
Uncaught exception
The thread '<No Name>' (0x1) has exited with code 0 (0x0).
This is my full program:
using System.Threading;
using System.IO.Ports;
using System.Text;
using Microsoft.SPOT;
using GHIElectronics.NETMF.FEZ;
namespace MFConsoleApplication1
{
public class Program
{
public static void Main()
{
SerialPort UART = new SerialPort( "COM1", 115200 );
int read_count = 0;
byte[] tx_data;
byte[] rx_data = new byte[ 10 ];
tx_data = Encoding.UTF8.GetBytes( "FEZ" );
string rx_string = "";
UART.Open();
Debug.Print( "COM port opened" );
UART.ReadTimeout = 0;
while ( true )
{
// flush all data
UART.Flush();
// send some data
Debug.Print( "Writing 'FEZ'" );
UART.Write( tx_data, 0, tx_data.Length );
// wait to make sure data is transmitted
Thread.Sleep( 100 );
// read the data
Debug.Print( "Reading 'FEZ'" );
read_count = UART.Read( rx_data, 0, rx_data.Length );
Debug.Print( "Read data" );
rx_string = rx_data + "\r\n";
Debug.Print( rx_string.ToString() );
if ( read_count != 3 )
{
// we sent 3 so we should have 3 back
Debug.Print( "Wrong size: " + read_count.ToString() );
}
else
{
Debug.Print( rx_data.ToString() );
// the count is correct so check the values
// I am doing this the easy way so the code is more clear
if ( tx_data[ 0 ] == rx_data[ 0 ] )
{
if ( tx_data[ 1 ] == rx_data[ 1 ] )
{
if ( tx_data[ 2 ] == rx_data[ 2 ] )
{
Debug.Print( "Perfect data!" );
}
}
}
}
Thread.Sleep( 100 );
}
}
}
}
Set timeout before you open the port.
Wrong:
...
UART.Open();
Debug.Print( "COM port opened" );
UART.ReadTimeout = 0;
...
Correct:
...
UART.ReadTimeout = 0;
UART.Open();
Debug.Print( "COM port opened" );
...
That was it.
SerialPort UART = new SerialPort( "COM1", 115200 );
UART.ReadTimeout = 0;
int read_count = 0;
byte[] tx_data;
byte[] rx_data = new byte[ 10 ];
tx_data = Encoding.UTF8.GetBytes( "FEZ" );
string rx_string = "";
UART.Open();
Debug.Print( "COM port opened" );
