Output Port Access

This group contains macros and defines to initialize port pins for output and safely set output states. More...

Macros
#define	IO_PORT_STRENGTH_WEAK   0
	Bit mask to set weak drive strength for all selected pins. More...
#define	IO_PORT_STRENGTH_STRONG   0xff
	Bit mask to set strong drive strength for all selected pins. More...
#define	IO_PORT_DRAIN_DISABLE   0
	Bit mask to disable drain mode for all selected pins. More...
#define	IO_PORT_DRAIN_ENABLE   0xff
	Bit mask to enable drain mode for all selected pins. More...
#define	IO_PORT_OUT_INIT(port, pins, strength, drain, on, set)
	Initializes a set of port pins as outputs. More...
#define	IO_PORT_OUT_SET(port, pins, on, set)
	Set a set of output port pins. More...

Detailed Description

This group contains macros and defines to initialize port pins for output and safely set output states.

Macro Definition Documentation

IO_PORT_DRAIN_DISABLE

#define IO_PORT_DRAIN_DISABLE   0

Bit mask to disable drain mode for all selected pins.

IO_PORT_DRAIN_ENABLE

#define IO_PORT_DRAIN_ENABLE   0xff

Bit mask to enable drain mode for all selected pins.

IO_PORT_OUT_INIT

#define IO_PORT_OUT_INIT	(		port,
			pins,
			strength,
			drain,
			on,
			set
	)

Value:

{ \
        port##_DIR |= pins; \
        SFR_PAGE(_pp3, noSST); \
        port##_OD &= (drain) | ~(pins); \
        port##_OD |= (drain) & (pins); \
        port##_DS &= (strength) | ~(pins); \
        port##_DS |= (strength) & (pins); \
        SFR_PAGE(_pp0, noSST); \
        port##_DATA &= ((set) ^ ~(on)) | ~(pins); \
        port##_DATA |= ((set) ^ ~(on)) & (pins); \
}

Initializes a set of port pins as outputs.

Warning

Expects port page 0 and RMAP 0, take care in ISRs

Parameters

port	The parallel port to configure
pins	A bit mask of the pins to select
strength	A bit mask of pins with strong drive strength
drain	A bit mask of pins that only drive GND
on	A bit mask of pins that defines the states which represent on

See also

IO_PORT_ON_GND

IO_PORT_ON_HIGH

Parameters

set	Initial logical values for the defined outputs

IO_PORT_OUT_SET

#define IO_PORT_OUT_SET	(		port,
			pins,
			on,
			set
	)

Value:

{\
        port##_DATA &= ((set) ^ ~(on)) | ~(pins); \
        port##_DATA |= ((set) ^ ~(on)) & (pins); \
}

Set a set of output port pins.

Warning

Expects port page 0 and RMAP 0, take care in ISRs

Parameters

port	The parallel port to set
pins	A bit mask of the pins to select
on	A bit mask of pins that defines the states which represent on

See also

IO_PORT_ON_GND

IO_PORT_ON_HIGH

Parameters

set	Set logical values for the defined outputs

IO_PORT_STRENGTH_STRONG

#define IO_PORT_STRENGTH_STRONG   0xff

Bit mask to set strong drive strength for all selected pins.

IO_PORT_STRENGTH_WEAK

#define IO_PORT_STRENGTH_WEAK   0

Bit mask to set weak drive strength for all selected pins.