in16(), inbe16(), inle16()
Read a 16-bit value from a port
#include <hw/inout.h> uint16_t in16( uintptr_t port ); #define inbe16 ( port ) ... #define inle16 ( port ) ...
- The port you want to read the value from.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The in16() function reads a 16-bit value from the specified port in native-endian format (there's no conversion required).
The inbe16() and inle16() macros read a 16-bit value that's in big-endian or little-endian format, respectively, from the specified port, and returns the value as native-endian.
The inbe16() and inle16() macros access the specified port more than once if endian conversion is necessary. This could be a problem on some hardware.
A 16-bit value in native-endian.
The calling process must also use mmap_device_io() to access the device's I/O registers.
Both inbe16() and inle16() are implemented as macros.
Last modified: 2013-12-23