in8()

Read an 8-bit value from a port

Synopsis:

#include <hw/inout.h>

uint8_t in8( uintptr_t port );

Arguments:

port
The port you want to read the value from.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The in8() function reads an 8-bit value from the specified port.

Returns:

An 8-bit value.

Classification:

QNX Neutrino

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes

Caveats:

The calling thread must have the PROCMGR_AID_IO ability enabled and must have I/O privileges; see procmgr_ability() , and ThreadCtl() 's _NTO_TCTL_IO command for details.

The calling process must also use mmap_device_io() to access the device's I/O registers.

Last modified: 2013-12-23

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