diff --git a/buzzer.c b/buzzer.c
index a6611a4..cddbe23 100644
--- a/buzzer.c
+++ b/buzzer.c
@@ -72,7 +72,7 @@ void __attribute__((weak)) buzzer_end_callback(buzzer_t *buzzer){
 void buzzer_interrupt(buzzer_t *buzzer){
 	uint16_t i;
 	if (buzzer->active)
-		buzzer->counting += buzzer->millisScaledBy10;
+		buzzer->counting += buzzer->cycleMsInterval;
     if (buzzer->active && buzzer->play_param.len > 0 
 		&& buzzer->counting > buzzer->play_param.time){	
 		i = buzzer->play_param.i;
@@ -184,7 +184,7 @@ void buzzer_turn_on(buzzer_t *buzzer, uint16_t freq){
 void buzzer_start(buzzer_t *buzzer, uint16_t freq, uint16_t period, uint16_t loop_time){
     if (buzzer != NULL){
         buzzer->play_param.i = 0;
-        buzzer->play_param.time = period*10;//millisScaledBy10
+        buzzer->play_param.time = period;//cycleMsInterval
         buzzer->play_param.loop_time = loop_time*2;
         buzzer->play_param.pTimes = NULL;
         buzzer->play_param.pFreq = NULL;
diff --git a/buzzer.h b/buzzer.h
index a1d902e..1c57d31 100644
--- a/buzzer.h
+++ b/buzzer.h
@@ -17,8 +17,8 @@
 #include <stddef.h>
 #include <string.h>
 
-//#define _BUZZER_DERIVER_USE_PWM 
-#define _BUZZER_DERIVER_USE_GPIO 
+#define _BUZZER_DERIVER_USE_PWM 
+//#define _BUZZER_DERIVER_USE_GPIO 
 
 /*
  * Enumerates
@@ -58,7 +58,7 @@ typedef enum{
  * 
  */
 #ifdef _BUZZER_DERIVER_USE_PWM
-typedef void (*pwmOutFx)(uint32_t freq);
+typedef void (*pwmOutFx)(uint16_t freq);
 #endif
 
 #ifdef _BUZZER_DERIVER_USE_GPIO
@@ -85,7 +85,7 @@ typedef struct{
 
     // the interrupt period that you will call buzzer_interrupt()
     // necessary for buzzer_start() and buzzer_start_array()
-    uint16_t millisScaledBy10;
+    uint16_t cycleMsInterval;
 
     buzzer_active_e active;
     uint16_t counting;