Leo
Here is a code snippet that uses the PC speaker driver (rather than the
sound chip which would be more involved) to create two short beeps. You can
edit it to make the beeps longer or shorter.
You can also remove one of the beeps. You might also want to replace the
busy-wait for-loop with an RT wait of some sort. If you want a reference see
"The Indispensable PC Hardware Book"
by Hans-Peter Messmer (third edition).
short tc = 1193180/440;
int i;
outb(inb(0x61) | 3), 0x61);
outb(0xB6, 0x43);
outb(tc & 0xFF, 0x42);
outb((tc >> 8) & 0xFF, 0x42);
for(i=0; i<20000000; i++){}
outb(inb(0x61) & 0xFC, 0x61);
for(i=0; i<100000000; i++){}
outb(inb(0x61) | 3), 0x61);
outb(0xB6, 0x43);
outb(tc & 0xFF, 0x42);
outb((tc >> 8) & 0xFF, 0x42);
for(i=0; i<20000000; i++){}
outb(inb(0x61) & 0xFC, 0x61);
Daniel
>hello!
>I plan to write a simple interrupt routine to verify the PC
>have recieved the interrupt signal.
>
>could the interrupt routine do nothing but make a beep
>sound?
>
>It seems that following code doesn't work.:
>
>printk("D", 0x07);
>
>regards.
>
>leo
>
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