beeper.c

См. документацию.

 
#include <io/ports.h>
#include <drv/beeper.h>
#include <sys/timer.h>
 
uint32_t config = 0;            
 
void beeperPlay(uint32_t frequency) {
    uint32_t Div;
    uint8_t tmp;
 
    Div = getFrequency() * 1000;
    Div /= frequency;
    
    outb(0x43, 0xb6);
    outb(0x42, (uint8_t) (Div) );
    outb(0x42, (uint8_t) (Div >> 8));
    
    tmp = inb(0x61);
    
    if (tmp != (tmp | 3)) {
        outb(0x61, tmp | 3);
    }
}
 
void beeperSilent() {
    uint8_t tmp = inb(0x61) & 0xFC;
    outb(0x61, tmp);
}