Need help for STM32F103ZGT6 in Keil. Have reset problems. Please help.

Hello,

I am working on STM32F103ZGT6 with Keil Compiler. The version of Keil & other info are as below,
IDE-Version:
µVision V4.23.00.0

Tool Version Numbers:
Toolchain: MDK-ARM Standard Version: 4.23
Toolchain Path: C:\Keil\ARM\BIN40
C Compiler: Armcc.Exe V4.1.0.894
Assembler: Armasm.Exe V4.1.0.894
Linker/Locator: ArmLink.Exe V4.1.0.894
Librarian: ArmAr.Exe V4.1.0.894
Hex Converter: FromElf.Exe V4.1.0.894
CPU DLL: SARMCM3.DLL V4.23
Dialog DLL: DARMSTM.DLL V1.63.0.0
Target DLL: UL2CM3.DLL V1.95
Dialog DLL: TARMSTM.DLL V1.60

I am facing a weird problem, that STm32 is resetting for the smallest change in Code.

For example :
#define GuiConst_DISPLAY_WIDTH_test 480
#define GuiConst_BYTE_LINES_test 272
#define GuiConst_DISPLAY_BYTES_test (GuiConst_DISPLAY_WIDTH_test*GuiConst_BYTE_LINES_test)

And somewhere in my code, I have statements as below. for(i = 0; i < (GuiConst_DISPLAY_BYTES_test); i++) { LCD_Data_Disp_Transfer(k); }
, If the above code is present, the micro is working properly, where "GuiConst_DISPLAY_BYTES_test" is a Macro as defined above.

If I change it to "GuiConst_DISPLAY_WIDTH_test" in "for" loop, the STM32 starts resetting once it is in Debug Mode, it resets automatically every one sec automatically. Actually it is not reaching till this "for" loop at all. I can see that, it is entering into "main()", but after executing some functions in "main()", it resets automatically.

Can you please tell me, what could be the problem.
Should I have to update Keil, for this new STM32F103ZT6. Please guide me.. I have wasted lot of time in trail and error.

I have just posted an example where it is affecting.. But actually it is affecting in many more places. For many more changes. it is becoming difficult for me to do any changes and debug my development.

Rgds
Shankar B T
shankar.tangai@ika.in