Hi,

I am using an Olimex LPC-P2148 board. It has an ARM7TDMI-S based LPC2148 on it. I am using the ARM-JTAG parallel connector to debug it and I am using Keil uVision3 as compiler and debugger. I configured Keil with the ToolConf utility that came with HJTAG When i write a program without interrupts there is no problem running and debugging it on chip. Also there is no problem when I use interrupts and run the software without the debug adapter(no connections with PC at all). But when I run the program in uVision with debugging facility, the interrupts become disabled, even if the flags are raised, the interrupt jumps just don't happen.

So in short, i don't know why interrupts work without debugging, and why they stop working while debugging. As far as i thought of it there may be two sources, first is the ARM-JTAG connector and second is the HJTAG.

Things I tried:
I tried disabling semihosting and vector catch(and combinations), that didn't change anything.
I tried decreasing the connection speed, that only slowed down the debugging and uploading.

If anyone could help me, I would be very glad.

Alp Sayın

Could you check the value of  CPSR and see if the interrupt is disabled? Thx a lot.

send the sample program i wiil try to solve

very sorry for the late reply;

it seems when lpc2148 is in debug mode with jtag connector, the interrupts are disabled, i've read it in the datasheet of thelpc2148. To walkthrough this problem ARM suggests using RealMonitor, which i found to be a little difficult. Therefore I amkind of actually stuck in my project Well, I think I'll just code well, simulate and hope it will work for real

Anyways, thanks for the replies...

In debug mode, the interrupts are disabled. But, the interrupts will occur after the mcu returns to running mode.
Could you make sure that the CPSR and interrupt has been initialized appropriately?

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