public class MCP23017
extends com.diozero.internal.provider.mcp23xxx.MCP23x17
The MCP23X17 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits (IODIRA/B). The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.
The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and PORTB). The MCP23X17 can be configured to operate in the 8-bit or 16-bit modes via IOCON.BANK.
There are two interrupt GPIOs, INTA and INTB, that can be associated with their respective ports, or can be logically OR'ed together so that both GPIOs will activate if either port causes an interrupt. A special mode (Byte mode with IOCON.BANK = 0) causes the address pointer to toggle between associated A/B register pairs. For example, if the BANK bit is cleared and the Address Pointer is initially set to address 12h (GPIOA) or 13h (GPIOB), the pointer will toggle between GPIOA and GPIOB. Note that the Address Pointer can initially point to either address in the register pair.
deviceStates, shutdown
Constructor and Description |
---|
MCP23017() |
MCP23017(int interruptGpio) |
MCP23017(int interruptGpioA,
int interruptGpioB) |
MCP23017(int controller,
int address,
int interruptGpio) |
MCP23017(int controller,
int address,
int interruptGpioA,
int interruptGpioB) |
Modifier and Type | Method and Description |
---|---|
void |
close() |
protected byte |
readByte(int register) |
protected void |
writeByte(int register,
byte value) |
getBoardPinInfo, getDefValReg, getGPIntEnReg, getGPIOReg, getGPPullUpReg, getIntCapReg, getIntConReg, getIntFReg, getIOConReg, getIODirReg, getIPolReg, getOLatReg
closeGpio, createDigitalInputDevice, createDigitalInputOutputDevice, createDigitalOutputDevice, getName, getValue, getValues, initialise, setDirections, setInputMode, setOutputMode, setValue, setValues, valueChanged
createPinKey, deviceClosed, deviceOpened, getDevice, isDeviceOpened, isShutdown, shutdown
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
provisionDigitalInputDevice, provisionDigitalInputOutputDevice, provisionDigitalOutputDevice
createPinKey, deviceClosed, deviceOpened, isDeviceOpened, isShutdown, shutdown
public MCP23017() throws RuntimeIOException
RuntimeIOException
public MCP23017(int interruptGpio) throws RuntimeIOException
RuntimeIOException
public MCP23017(int interruptGpioA, int interruptGpioB) throws RuntimeIOException
RuntimeIOException
public MCP23017(int controller, int address, int interruptGpio) throws RuntimeIOException
RuntimeIOException
public MCP23017(int controller, int address, int interruptGpioA, int interruptGpioB) throws RuntimeIOException
RuntimeIOException
public void close() throws RuntimeIOException
close
in interface GpioExpander
close
in interface Closeable
close
in interface AutoCloseable
close
in class com.diozero.internal.provider.mcp23xxx.MCP23xxx
RuntimeIOException
protected void writeByte(int register, byte value)
writeByte
in class com.diozero.internal.provider.mcp23xxx.MCP23xxx
protected byte readByte(int register)
readByte
in class com.diozero.internal.provider.mcp23xxx.MCP23xxx
Copyright © 2016–2017 mattjlewis. All rights reserved.