Add multitone support for loudspeaker

stm-firmware/main.c

@@ -259,7 +259,7 @@ int main()
 			oven_driver_set_power(0U);
 
 			/* Activate loundspeaker permanently */
-			loudspeaker_set(1);
+			loudspeaker_set(100);
 		} else if (pid_controller_active) {
 			/* In case temperature measuremnt is okay and controlelr is working, write output power */
 			oven_driver_set_power(pid_controller_output < 0 ? 0U : (uint8_t)pid_controller_output);