No jtag device found after program download (LPC2378)

Hello,

I use uVision V3.50 and the evaluation board MCB2300 (Keil) with an LPC2378.
I have compiled some of the code examples and was able to download them to flash via JTAG using ULINK adapter.
After I had downloaded a selfwritten program, I am not able to download anything anymore. I get a popup saying "No JTAG devices found".

Does anyone have any idea how this can be solved?

 RE: No jtag device found after program download (LPC2378)

You need to erase the device using FlashMagic. Take a look here: http://www.keil.com/support/docs/3315.htm

 RE: No jtag device found after program download (LPC2378)

Thanks for the suggestion, but I have already tried using FlashMagic (3.48.195), even with a brandnew board that just came out of the box, without any result.
I have removed jumpers J4 and J13, boot the board, but when I try to read the device signature (with the advanced hardware option 'Use DTR and RTS...' enabled), I get an error saying: Operation failed (reading signature).
What is the problem here, and how can it be resolved?

 RE: No jtag device found after program download (LPC2378)

This just works fine here. Are you using FlashMagic 3.50? Is the brand-new board still displaying some text in the LCD display?

- Connection needs to be on COM1 on the MCB23xx. - Cable should be a 1:1 cable connecting to a COM interface of the computer.

 RE: No jtag device found after program download (LPC2378)

Thanks for your fast response. See http://www.keil.com/support/man/docs/mcb2300/mcb2300_su_connecting_serial.htm: it says COM0 on MCB2300 should be used!
I will try the newest FlashMagic. Stay tuned.

 RE: No jtag device found after program download (LPC2378)

I just discovered that FlashMagic does not work in combination with my Eminent USB/RS232 converter. After connecting my 1:1 RS232 cable to a regular com port on my PC and to COM0 on my MCB2300 board, I got things back to work using FlashMagic.