Posted on May 17, 2011 at 12:06Hi,
I'm using the ED3k3 board with a uPSD3334V-40U6 MCU. I have purhcased an expanded code limit upto 32kb.
I'm running a simple message program that uses UART0 to transmit messages from a buffered queue.
My program compiles fine, however, when I use my RLINK-ST JTAG to flash it over, I get the following pop-up window:
''OPI 51
Step is not over yet? Go on?
YES or NO''
here's the disassembly code the program hangs at is:
01AB: 20 db 20h ; ' '
If I hit yes, the pop-up window comes back again, if I hit no, the program stops execution at some assembly instruction for code in the startup.a51:
01A3: 20D504 JB F0, 01AA
I am using the default startup.a51 that was provided with a slight modification to SCON, SCON = 0x52H.
I have checked to make sure all the environment variables are correct, I have already used the UART and the UART isr in a different project with same hardware and it works fine.
In debugging, I found some instances where initializing some global and local variables (int) to zero causes problems. In some cases, if I comment out the initialization and leave just the declaration, then the pop-up window doesnt show.
Is there an new errata sheet I should look into?
I am a novice, any help is appreciated.
thanks.
