interrupt-on-change feature by setting INTCON register not working

[varun-s]

Using the MCP23017 to capture push button press.

Configuration:
mcp.interrupt_enable = 0xFF00 #interrupts enabled on port B
mcp.interrupt_configuration = 0xFF00 # Port B bits set, so corresponding I/O pin should be compared to DEFVAL register
mcp.default_value = 0x0000

Expected behavior :
interrupt should only be triggered when the button is pushed

Actual:
Interrupts are generated on both button push and 'pull' edges

[flyte]

This might be caused by switch bounce, which makes the logic level rapidly switch between high and low multiple times when engaging or disengaging the switch.

http://www.labbookpages.co.uk/electronics/debounce.html

You can try putting a small capacitor across the switch terminals to see if it helps, as explained in the link above.