NetBurner Community Forum

Is it possible to read the current state of the RSTi (aka RESET) pin on a Mod5270?

From digging through the Freescale 5270 manual, I see that I can read the Reset Status Register (RSR) and see whether the last reset event was caused by the RSTi pin or not, but I actually need to read the current value of that pin AFTER the reset has occurred.

I'm trying to emulate the classic reset button on the back of a Wifi Router where a short push does a normal reset and holding it down for 5 seconds causes it to reset all defaults.

I'm basically looking for a way to be able to read that pin after starting up to know if it is still being held down or not.

Any suggestions?

Thanks.
Scott

As long as RSTI is low you will not have any code running.
Hard to read a value if your CPU is halted.

The right way to do this is with a Cap coupled reset circuit and a separate sense line.

Thanks Paul that's what I was afraid of. We do indeed have the reset switch on a cap-coupled line. If I hold the switch down it does a reset, but then will startup and run code normally. My HW guy swore I should be able to read the state of the switch after the reset.

I grilled him on it at the time as I was concerned about this.

I just went back and looked at his schematic closer and I can see there is a tag with it also going off to J2-35. So I guess maybe he did go off and research it after I expressed concern and connected it to a GPIO also exactly as you suggested. He just never told me.

Thanks.
Scott