Re: [LIP] Sound function

Hi,

You can write your own funtions to program the PIT and get sound of the speaker.
info can be found at 

http://www.arl.wustl.edu/~lockwood/class/cs306/class-resources/gpe/speaker.txt.html

The following C code does that job.

void speaker(int freq)
{
unsigned short counter;
unsigned char temp;

	//Speaker port
	if (ioperm(0x61, 1, 1)) 
	{
 		perror("ioperm(speaker_port)"); 
   		return;
    }  
    //PIT Control port
	if (ioperm(0x43, 1, 1))   
 	{
  		perror("ioperm(PIT_port)"); 
    	return;
 	}
 	
 	//PIT Channel 2
	if (ioperm(0x42, 1, 1)) 
 	{
  		perror("ioperm(PIT_port)"); 
		return;
  	} 
  	
	counter = 0x1234DD / freq;
	outb(0xb6,0x43);
	outb(counter%256,0x42);
	outb(counter/256,0x42);
	temp = inb(0x61);
	outb(temp|3,0x61);
	ioperm(0x61, 1, 0);
	ioperm(0x43, 1, 0);
	ioperm(0x42, 1, 0);

}

void speaker_off(void)
{
unsigned char temp;

	//Speaker port
	if (ioperm(0x61, 1, 1)) 
 	{
  		perror("ioperm(speaker_port)"); 
    	return;
 	}  
	temp = inb(0x61);
	outb(temp&0xfc,0x61);
	ioperm(0x61, 1, 0);

}

BUT you should have permissions to access the ioports. You can run
that code as root.


Regards,
V.Arun






On Mon, 8 Nov 2004 09:43:47 +0530 (IST), H S Rai <[email protected]> wrote:
> Is there some function in C++ (GCC) to generate sound of particular
> frequency (for internal PC speaker) like:
> 
>        sound(frequency); // Generate sound of frequency
> 
> Thanks in advance,
> 
> --
> H.S.Rai    http://www.grex.org/~hsrai | Registered Linux User # 223684
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-- 

Arun Venkataswamy


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