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[Hank]

Hi,

I just received my new Dragon board with the optional LCD display and I am trying to test it using the USB LCD text sample that is provided with the board. I have been able to program the board to turn the LED’s on and off so I believe that the USB driver is installed correctly but when I try to communicate with the board using the LCD_text.c program it fails on the following line:

DragonDeviceHandle = CreateFile("\\\\.\\DRAGON_USB-0",
GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);

The LCD_Text.c file had a compile error and I had to change the following line from

HANDLE* DragonDeviceHandle;

To

HANDLE DragonDeviceHandle;

So, I am not sure if the version of the LCD_Text file that I have has been tested and it may have more errors. Perhaps the "\\\\.\\DRAGON_USB-0" parameter in the CreateFile is wrong. Have any of you been able to get this sample to work?

Thank you very much for any help. If you have a fixed version of the LCD_Text file you can send it to me directly at hheidt @ cox . net

[fpga4fun]

1. What version of MSVC are you using?
2. Can you give us more details by "the program fails"? Does the assert fails?

[Hank]

The assert fails. The handle returned by the CreateFile() call is NULL. I am using Visual Studio .Net to build the program but I'll try building the application using Visual Studio 6.0 tonight and if it works I'll update this thread. I am running under Windows XP Professional.

[Hank]

I have it working now. I tried everything on a different computer and the LCD_Text.c application now works when compiled with either VS .Net or VS 6.0.

Perhaps if I re-install the Dragon USB driver it will fix the problem on my previous computer.

[fpga4fun]

Good. Still weird that it didn't work on one computer.
You could check the following:
1. Plug the Dragon board in USB, XP should "beep"
2. Check the Device Manager, the Dragon board should be listed (in the USB section)

[inan]

Hi,

I would like to run LCD_Text.c code but I am not familiar with Visual Studio.NET, what kind of project should I create (MFC, win32, etc)? Is there any specific configuration that has to be done instead default? What am I supposed to see on the screen after application runs succesfully?

I got lost on running this code, thanks for any help.

[chokol]

I remember reading an article about his problem somewhere. Maybe I will check again and tell you later
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