Espresso 0.0.2c

drivers/audio/pcspeaker.c

@@ -0,0 +1,46 @@
+#include <stdlib.h>
+#include <port_io.h>
+
+#include <drivers/audio/pcspeaker.h>
+
+/*
+this code is taken from the OSDev wiki: https://wiki.osdev.org/PC_Speaker
+with slight modifications to the local variable and parameter names,
+along with removing the 'static' keyword from play_sound and nosound (which is renamed to stop_sound)
+*/
+
+void play_sound(uint32_t nfrequence)
+{
+ 	uint32_t div;
+ 	uint8_t tmp;
+ 
+  // Set the PIT to the desired frequency
+ 	div = 1193180 / nfrequence;
+ 	outb(0x43, 0xb6);
+ 	outb(0x42, (uint8_t) (div));
+ 	outb(0x42, (uint8_t) (div >> 8));
+ 
+  // And play the sound using the PC speaker
+ 	tmp = inb(0x61);
+  if (tmp != (tmp | 3))
+  {
+ 		outb(0x61, tmp | 3);
+ 	}
+ }
+ 
+// make it shut up
+void stop_sound(void)
+{
+ 	uint8_t tmp = inb(0x61) & 0xFC;
+ 	outb(0x61, tmp);
+ }
+ 
+// Make a beep
+void beep(void)
+{
+  play_sound(1000);
+  //timer_wait(10);
+  sleep(10);
+  stop_sound();
+  //set_PIT_2(old_frequency);
+ }