Package mars.mips.instructions.syscalls

Class SyscallMidiOut

java.lang.Object

mars.mips.instructions.syscalls.AbstractSyscall

mars.mips.instructions.syscalls.SyscallMidiOut

All Implemented Interfaces:

Syscall

public class SyscallMidiOut
extends AbstractSyscall

Service to output simulated MIDI tone to sound card. The call returns immediately upon generating the tone. By contrast, syscall 33 (MidiOutSync) does not return until tone duration has elapsed.

Constructor Summary

Constructors

Constructor	Description
SyscallMidiOut()	Build an instance of the syscall with its default service number and name.

Method Summary

Modifier and Type	Method	Description
void	simulate(BasicStatement statement)	Performs syscall function to send MIDI output to sound card.

Methods inherited from class mars.mips.instructions.syscalls.AbstractSyscall

getName, getNumber, setNumber

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SyscallMidiOut

public SyscallMidiOut()

Build an instance of the syscall with its default service number and name.

Method Details

simulate

public void simulate(BasicStatement statement)
              throws SimulatorException

Performs syscall function to send MIDI output to sound card. This requires four arguments in registers $a0 through $a3.
$a0 - pitch (note). Integer value from 0 to 127, with 60 being middle-C on a piano.
$a1 - duration. Integer value in milliseconds.
$a2 - instrument. Integer value from 0 to 127, with 0 being acoustic grand piano.
$a3 - volume. Integer value from 0 to 127.
Default values, in case any parameters are outside the above ranges, are $a0=60, $a1=1000, $a2=0, $a3=100.
See MARS documentation elsewhere or www.midi.org for more information. Note that the pitch, instrument and volume value ranges 0-127 are from javax.sound.midi; actual MIDI instruments use the range 1-128.

Specified by:

simulate in interface Syscall

Specified by:

simulate in class AbstractSyscall

Parameters:

statement - BasicStatement object for this syscall instruction.

Throws:

SimulatorException