rtapi_outb

NAME

rtapi_outb, rtapi_inb — Perform hardware I/O

SYNTAX

void rtapi_outb ( unsigned char byte, unsigned int port )

unsigned char rtapi_inb ( unsigned int port )

ARGUMENTS

port
The address of the I/O port

byte
The byte to be written to the port

DESCRIPTION

rtapi_outb writes a byte to a hardware I/O port.

rtapi_inb reads a byte from a hardware I/O port.

REALTIME CONSIDERATIONS

May be called from init/cleanup code and from within realtime tasks. Not available in userspace components.

RETURN VALUE

rtapi_inb returns the byte read from the given I/O port

NOTES

The I/O address should be within a region previously allocated by rtapi_request_region.
Otherwise, another real-time module or the Linux kernel might attempt to access the I/O region at the same time.

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