Sound Driver

Description

The PC Speaker is used to play some sound in k. It is used by moduling the frequency to produce sound with the channel 2 of the PIT.

Syscall interface

NAME
    playsound - play a melody
SYNOPSIS
    int playsound(t_melody *melody, int repeat);
DESCRIPTION
    playsound() launches the given melody, and repeats it, if the repeat
    flag is set.
RETURN VALUE
    playsound() returns 0 on success or -1 otherwise.

Recommended methodology

• Enable the channel 2 of the PIT
• Prepare the PIT
• Make a function to stop the sound
• Make the sound you want: COUNT = PIT Frequency (Hz) / Sound Frequency (Hz)
• Play the sound as long as requested (Using the first timer)
• Handle the repeat option

Possible bug causes

• You may have disabled the counter 0 of the PIT by enabling the counter 2
• You may have disabled the PC speaker in the BIOS
• If you already are listening to something, you may not have any sound

Notes

The creation of each t_melody can be found in sdk/mkksf/mkksf.c