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Read a 32-bit value from a port
#include <hw/inout.h>
uint32_t in32( uintptr_t port );
#define inbe32 ( port ) ...
#define inle32 ( 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 in32() function reads a 32-bit value from the specified port.
The inbe32() and inle32() macros read a 32-bit value that's in big-endian
or little-endian format, respectively, from the specified port, and returns the value as native-endian.
A 32-bit value in native-endian.
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.
Both inbe32() and inle32() are implemented as macros.
in8(),
in8s(),
in16(),
in16s(),
in32s(),
mmap_device_io(),
out8(),
out8s(),
out16(),
out16s(),
out32(),
out32s()
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