enableInterrupt()

void enableInterrupt	(	int	gpio,
		MCPIntTrigger	trigger,
		bool	defaultValue = false,
		uint8_t	hwAddr = 0
	)

Enables interrupt on the specific pin.

Interrupt flags are cleared reading GPIO or calling getPortIntCaptured().

Parameters

gpio	Input pin to setup as interrupt source (MCP_A0...MCP_A7 and MCP_B0...MCP_B7)
trigger	Type of interrupt trigger. MCPIntTrigger::DefaultChange, trigs interrupt if pin is different than defaultValue parameter. MCPIntTrigger::PreviousChange trigs interrupt if pin just changes its value.
defaultValue	Default value when trigger is MCPIntTrigger::DefaultChange. False = low, True = high
hwAddr	Optional hardware device address

Example:

// INTA or INTB are high on interrupt
io.setINTActiveHigh(true);

// INTB is high whenever B1 changes its value
io.enableInterrupt(MCP_B1, MCPIntTrigger::PreviousChange);

// INTA is high whenever A2 is high
io.enableInterrupt(MCP_A2, MCPIntTrigger::DefaultChange, false);

Examples

VGA/HardwareTest/HardwareTest.ino.

Definition at line 288 of file MCP23S17.cpp.