in8s()

Read 8-bit values from a port

Synopsis:

#include <hw/inout.h>

void * in8s( void * buff,
             unsigned len,
             uintptr_t port );

Arguments:

buff

A pointer to a buffer where the function can store the values read.

len

The number of values that you want to read.

port

The port you want to read the values from.

Library:

libc

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

Description:

The in8s() function reads len 8-bit values from the specified port and stores them in the buffer pointed to by buff.

Returns:

A pointer to the end of the read data.

Classification:

QNX Neutrino

Caveats:

The calling thread must have I/O privileges; see 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.

See also:

in8(), in16(), in16s(), in32(), in32s(), mmap_device_io(), out8(), out8s(), out16(), out16s(), out32(), out32s()