When I use JTAG to load my C code to evaluation board, it loads successfully. However, when I executed my code from main(), I immediately got "CPU is not halted" error, followed by "No APB-AP found" error.
I was able to load and executed the USB-related code before I got this error.
I googled for it and use JTAG command "rx 0" to reset the target, but it does not make any change.
I am using ARM Cortex-M3 Processor, J-Link ARM V4.14d, IAR Embedded workbench IDE.
Thanks for ur help.