Critical Warning (16248): pin is placed too close with ADC pins.

Hi Rahul,

Thanks very much for following up. Basically any critical warnings freak me out. I tried more things after I posted the message here.

1. I changed the signal name to a shorter name and reassign pin K5 to it. Wow, the critical warning was gone, but there was another warning "Warning (15714): Some pins have incomplete I/O assignments. Refer to the I/O Assignment Warnings report for details"
2. I found this link https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/solutions/rd03312014_182.html , but set_instance_assignment -name <parameter> DEFAULT -to <pin_name> threw errors
3. I added the following to the qsf file

"set_instance_assignment -name CURRENT_STRENGTH_NEW 12MA -to Signal

set_instance_assignment -name SLEW_RATE 2 -to Signal"

The "incomplete I/O assignments" warning was gone, but the ADC critical warning was back again

3. I commented the 2 lines I added to qsf and stay with the incomplete I/O assignment warning for now, this is more acceptable.

So basically this is quite funky and I don't know how to fix. If it is the noise issue of the GPIO pin, how to fix? Thanks