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I am trying to use Teraterm rs232 comport. when I am running MDK Arm Software to download the program or in debug mode. The problem I see is that the ULINK2 can not be accessed when I set TeraTerm to the comport where I have a USB adapter to RS232 interface.
As soon as I close Teraterm the ULINK2 can be accessed.
This problem started occurring when I had to reinstall the MDK ARM software because I tried to install the free STM Lo version. and lost the MDKLite license. So I just uninstalled the MDK version and reinstalled it again to get back the MDK Lite license.
I was running out of Ideas. So I reinstalled the Keil software to a second place on my hard drive. Then It was also behaving the same. Then I Just removed the cable from the board while leaving the keil program running. then Keil was responsive. I guess that the RS232 cable was driving the two pins and affecting the board. then I just removed the RS232 adapter from the PC and put back in the PC. Then Keil ULINK2 was still responsive after that. So It looks like that the RS232 Adapter had been affecting the board and stopping debug operation when Tera Term was running. But now after the rs232 adapter went through a reset everything is operating as expected.
the serial cable may be causing the lpc2300 to enter ISP mode
www.compuphase.com/lpc2100_isp.htm
Thank You, Ron. I think it is a good idea to make a special rs232 cable to with only the rx and tx wires hooked up. So that the other pins are floating.