35 lines
976 B
Text
35 lines
976 B
Text
.TH rtapi_outb "3rtapi" "2006-10-12" "LinuxCNC Documentation" "RTAPI"
|
|
.SH NAME
|
|
|
|
rtapi_outb, rtapi_inb \- Perform hardware I/O
|
|
|
|
.SH SYNTAX
|
|
.HP
|
|
void rtapi_outb(unsigned char \fIbyte\fR, unsigned int \fIport\fR)
|
|
.HP
|
|
unsigned char rtapi_inb(unsigned int \fIport\fR)
|
|
|
|
.SH ARGUMENTS
|
|
.IP \fIport\fR
|
|
The address of the I/O port
|
|
.IP \fIbyte\fR
|
|
The byte to be written to the port
|
|
|
|
.SH DESCRIPTION
|
|
\fBrtapi_outb\fR writes a byte to a hardware I/O port. \fBrtapi_inb\fR
|
|
reads a byte from a hardware I/O port.
|
|
|
|
.SH REALTIME CONSIDERATIONS
|
|
May be called from init/cleanup code and from within realtime tasks.
|
|
Not available in userspace components.
|
|
|
|
.SH RETURN VALUE
|
|
\fBrtapi_inb\fR returns the byte read from the given I/O port
|
|
|
|
.SH NOTES
|
|
The I/O address should be within a region previously allocated by
|
|
\fBrtapi_request_region\fR. Otherwise, another real-time module or the Linux
|
|
kernel might attempt to access the I/O region at the same time.
|
|
|
|
.SH SEE ALSO
|
|
\fBrtapi_region(3rtapi)\fR
|