add possibility to change buzzer freq (original contrib by fertito)

driver/buzzer.c

@@ -82,6 +82,8 @@ void reset_buzzer(void)
 {
 	sBuzzer.time 	= 0;
 	sBuzzer.state 	= BUZZER_OFF;
+
+	sBuzzer.steps	= BUZZER_TIMER_STEPS;		
 }
 
 // *************************************************************************************************
@@ -107,7 +109,7 @@ void start_buzzer(u8 cycles, u16 on_time, u16 off_time)
 		TA1CTL = TACLR | MC_1 | TASSEL__ACLK;
 
 		// Set PWM frequency 
-		TA1CCR0 = BUZZER_TIMER_STEPS;		
+                TA1CCR0 = sBuzzer.steps;
 
 		// Enable IRQ, set output mode "toggle"
 		TA1CCTL0 = OUTMOD_4;

driver/buzzer.h

@@ -87,6 +87,10 @@ struct buzzer
 	
 	// Current buzzer output state
 	u8 state;
+
+        // Current steps (~freq)
+        u8 steps;
+
 };
 extern struct buzzer sBuzzer;