#include #include #include void play_sound(uint32_t frequency) { uint32_t divided; uint8_t tmp; divided = 1193180 / frequency; outb(0x43, 0xb6); outb(0x42, (uint8_t) (divided)); outb(0x42, (uint8_t) (divided >> 8)); tmp = inb(0x61); if (tmp != (tmp | 3)) { outb(0x61, tmp | 3); } } static void shut_up() { uint8_t tmp = inb(0x61) & 0xFC; outb(0x61, tmp); } // Make a beep void beep(uint32_t frequency, uint32_t ticks) { play_sound(frequency); timer_wait(ticks); shut_up(); }