SCI Interrupt Won't Occur W/O Target Device

[Designer11]

Hi,

I'm facing with an odd SCI interrupt issue, and i don't know whether that is how interrupt works or is there something wrong with my interrupt initialization code. I'm using Real Term to send string of commands to the target device which has RS232 and everything works flawlessly. I'm able to trace/see the SCI interrupt occurs and enter various break points in debug mode. The real and odd problem is when i unplugged the target device from my board and try to send commands, the first thing i notice is the SCI interrupt won't occurs at all. Is that how it suppose to work ?

I would like to know if there is a method to "kick start" the SCI interrupt without having it plug into the target device.

Thanks

D

[Designer11]

I found the bug. On power up i request the target device to send back  a few parameters and when the target is not plugged in it stuck in the request data loop.

[Rick_Li]

That's a good news!

Please update this thread if you need further assistance!