Memory layout of a data structure: Difference between revisions

=={{header|XPL0}}==

<syntaxhighlight lang "XPL0">

Assuming RS-232 pin 1 is connected to bit 0 of an I/O port et cetera, the

bits can be assigned names, such as these:

def CD=1<<0, RD=1<<1, TD=1<<2, DTR=1<<3, DSR=1<<4, RTS=1<<5, CTS=1<<6, RI=1<<7;

def RS232=$10;

The 'port' command can then be used to access these pin signals by name like this:

port(RS232):= TD ! RTS;

if port(RS232) & RD then ...

Note: The 'port' command is implemented in the Intel x86 versions but not

in the Raspberry Pi or Windows (EXPL32) versions.

]</syntaxhighlight>