QNX Developer Support
|This version of this document is no longer maintained. For the latest documentation, see http://www.qnx.com/developers/docs.|
Write a 32-bit value to a port
#include <hw/inout.h> void out32( uintptr_t port, uint32_t val ); #define outbe16( port, val ) ... #define outle32( port, val ) ...
- The port you want to write the value to.
- The value that you want to write.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The out32() function writes the 32-bit value, specified by val, to the specified port.
The outbe32() and outle32() functions macros the native-endian 32-bit value, specified by val, to the specified port in big-endian or little-endian format, respectively.
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.
outbe16() and outle16() are implemented as macros.