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Read an 8-bit value from a port
#include <hw/inout.h>
uint8_t in8( uintptr_t port );
- port
- The port you want to read the value from.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The in8() function reads an 8-bit value from the specified
port.
An 8-bit value.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
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.
in8s(),
in16(),
in16s(),
in32(),
in32s(),
mmap_device_io(),
out8(),
out8s(),
out16(),
out16s(),
out32(),
out32s()
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