IOBus Struct Reference

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Detailed Description

I/O bus descriptor.

This structure describes a group of contiguous digital I/O lines that have to be handled as bus.

Note:

I/O operations on a bus do not affect I/O lines on the same port but not belonging to the bus.

Definition at line 126 of file pal.h.

#include <pal.h>

Data Fields
ioportid_t	portid
	Port identifier.
ioportmask_t	mask
	Bus mask aligned to port bit 0.
uint_fast8_t	offset
	Offset, within the port, of the least significant bit of the bus.

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Field Documentation

ioportid_t IOBus::portid

Port identifier.

Definition at line 130 of file pal.h.

Referenced by palReadBus(), palSetBusMode(), and palWriteBus().

ioportmask_t IOBus::mask

Bus mask aligned to port bit 0.

Note:

The bus mask implicitly define the bus width. A logical AND is performed on the bus data.

Definition at line 136 of file pal.h.

Referenced by palReadBus(), palSetBusMode(), and palWriteBus().

uint_fast8_t IOBus::offset

Offset, within the port, of the least significant bit of the bus.

Definition at line 140 of file pal.h.

Referenced by palReadBus(), palSetBusMode(), and palWriteBus().