com.dalsemi.system
Class BitPort

java.lang.Object
  |
  +--com.dalsemi.system.BitPort

public class BitPort

extends Object

This class allows bit manipulation of available processor port pins, SMC Ethernet controller port pins and provides abstracted methods of manipulating bits in memory mapped IO addresses through the DataPort class.

See Also:

DataPort

Field Summary

static byte	ETH_EEDO SMC EEDO, output ONLY, pin 4.
static byte	ETH_EESK SMC EESK, output ONLY, pin 7.
static byte	ETH_IOS0 SMC IOS0, input ONLY, pin 98.
static byte	ETH_IOS1 SMC IOS1, input ONLY, pin 99.
static byte	ETH_IOS2 SMC IOS2, input ONLY, pin 1.
int	latchValue The last written value.
static byte	Port3Bit0 P3.0, RXD0, "serial 0", pin 4.
static byte	Port3Bit1 P3.1, TXD0, "serial 0", pin 5.
static byte	Port3Bit2 P3.2, /INT0, /SMCINT (Ethernet interrupt), pin 6.
static byte	Port3Bit3 P3.3, /INT1, /EXTINT (External interrupt), pin 7.
static byte	Port3Bit4 P3.4, T0, /SMCRST (Ethernet Reset), pin 10.
static byte	Port3Bit5 P3.5, T1, INTOW (Internal 1-Wire), pin 11.
static byte	Port5Bit0 P5.0, C0TX, I2C SCL, pin 21.
static byte	Port5Bit1 P5.1, C0RX, I2C SDA, pin 20.
static byte	Port5Bit2 P5.2, C1RX, RXD1, DS2480 RX, "serial 1", pin 19.
static byte	Port5Bit3 P5.3, C1TX, TXD1, DS2480 TX, "serial 1", pin 18.
static byte	Port5Bit4 P5.4, /PCE0, pin 17.
static byte	Port5Bit5 P5.5, /PCE1, pin 16.
static byte	Port5Bit6 P5.6, /PCE2, pin 15.
static byte	Port5Bit7 P5.7, /PCE3, pin 14.

Constructor Summary

BitPort(byte bitname)
Creates a new instance of BitPort using the bit specified.

BitPort(DataPort port)
Creates a new instance of BitPort using the DataPort object specified.

Method Summary

void	clear() Clears the port pin low.
void	clear(int bitpos) Clears the specified bit low.
int	read() Reads the port pin.
int	readBit(int bitpos) Reads the specified pin.
int	readLatch() Reads the current latch value.
int	readLatch(int bitpos) Reads the latch value of the specified pin.
void	set() Sets the pin high.
void	set(int bitpos) Sets the specified bit high.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

Port5Bit0

public static final byte Port5Bit0

P5.0, C0TX, I2C SCL, pin 21.

Port5Bit1

public static final byte Port5Bit1

P5.1, C0RX, I2C SDA, pin 20.

Port5Bit2

public static final byte Port5Bit2

P5.2, C1RX, RXD1, DS2480 RX, "serial 1", pin 19.

Port5Bit3

public static final byte Port5Bit3

P5.3, C1TX, TXD1, DS2480 TX, "serial 1", pin 18.

Port5Bit4

public static final byte Port5Bit4

P5.4, /PCE0, pin 17.

Port5Bit5

public static final byte Port5Bit5

P5.5, /PCE1, pin 16.

Port5Bit6

public static final byte Port5Bit6

P5.6, /PCE2, pin 15.

Port5Bit7

public static final byte Port5Bit7

P5.7, /PCE3, pin 14.

Port3Bit0

public static final byte Port3Bit0

P3.0, RXD0, "serial 0", pin 4.

Port3Bit1

public static final byte Port3Bit1

P3.1, TXD0, "serial 0", pin 5.

Port3Bit2

public static final byte Port3Bit2

P3.2, /INT0, /SMCINT (Ethernet interrupt), pin 6.

Port3Bit3

public static final byte Port3Bit3

P3.3, /INT1, /EXTINT (External interrupt), pin 7.

Port3Bit4

public static final byte Port3Bit4

P3.4, T0, /SMCRST (Ethernet Reset), pin 10.

Port3Bit5

public static final byte Port3Bit5

P3.5, T1, INTOW (Internal 1-Wire), pin 11.

ETH_EESK

public static final byte ETH_EESK

SMC EESK, output ONLY, pin 7. WARNING: This pin may also be used as serial flow control by the serial driver. Be aware of resource usage. You have been warned!

ETH_EEDO

public static final byte ETH_EEDO

SMC EEDO, output ONLY, pin 4. WARNING: This pin may also be used as serial flow control by the serial driver. Be aware of resource usage. You have been warned!

ETH_IOS0

public static final byte ETH_IOS0

SMC IOS0, input ONLY, pin 98. WARNING: This pin may also be used as serial flow control by the serial driver. Be aware of resource usage. You have been warned!

ETH_IOS1

public static final byte ETH_IOS1

SMC IOS1, input ONLY, pin 99. WARNING: This pin may also be used as serial flow control by the serial driver. Be aware of resource usage. You have been warned!

ETH_IOS2

public static final byte ETH_IOS2

SMC IOS2, input ONLY, pin 1. WARNING: This pin may also be used as serial flow control by the serial driver. Be aware of resource usage. You have been warned!

latchValue

public int latchValue

The last written value.

Constructor Detail

BitPort

public BitPort(byte bitname)

Creates a new instance of BitPort using the bit specified.

Parameters:

bitname - descriptor of bit to twiddle (e.g. Port5Bit0)

BitPort

public BitPort(DataPort port)

Creates a new instance of BitPort using the DataPort object specified.

Parameters:

port - An eight bit wide field of bits to twiddle

Method Detail

set

public void set()

Sets the pin high.

clear

public void clear()

Clears the port pin low.

read

public int read()

Reads the port pin.

Returns:

pin value

readLatch

public int readLatch()

Reads the current latch value. This is always the last value written. To read the current value of the pin, call the read method.

Returns:

latch value

set

public void set(int bitpos)
         throws IllegalAddressException

Sets the specified bit high.

Parameters:

bitpos - value 0-7 of bit to set

Throws:

IllegalAddressException - if DataPort reports an exception during the operation

clear

public void clear(int bitpos)
           throws IllegalAddressException

Clears the specified bit low.

Parameters:

bitpos - value 0-7 of bit to clear

Throws:

IllegalAddressException - if DataPort reports an exception during the operation

readBit

public int readBit(int bitpos)
            throws IllegalAddressException

Reads the specified pin.
Side effect: Will update all bits in the byte.

Parameters:

bitpos - value 0-7 of bit to read.

Returns:

port pin value

Throws:

IllegalAddressException - if DataPort reports an exception during the operation

readLatch

public int readLatch(int bitpos)

Reads the latch value of the specified pin. This is always the last value written. To read the current value of the pin, call the read method.

Parameters:

bitpos - value 0-7 of bit to read.

Returns:

latch value