init

button.c

@@ -120,12 +120,18 @@ void button_handler(struct Button* handle)
 /**
   * @brief  Start the button work, add the handle into work list.
   * @param  btn: target handle strcut.
-  * @retval None
+  * @retval 0: succeed. -1: already exist.
   */
-void button_start(struct Button* btn)
+int button_start(struct Button* btn)
 {
+	struct Button* target = head_handle;
+	while(target) {
+		if(target == btn) return -1;	//already exist.
+		target = target->next;
+	}
 	btn->next = head_handle;
 	head_handle = btn;
+	return 0;
 }
 
 /**
@@ -158,74 +164,4 @@ void button_ticks()
 		button_handler(target);
 	}
 }
-
-
-
-/*
-
-struct Button btn1;
-struct Button btn2;
-struct Button btn3;
-
-void main()
-{
-	button_init(&btn1, read_K1_pin, 0);
-	button_attach(&btn1, CLICK,            BTN1_Click_Handler);
-	button_attach(&btn1, DOUBLE_CLICK,     BTN1_DOUBLE_Click_Handler);
-	button_attach(&btn1, LONG_RRESS_START, BTN1_LONG_RRESS_START_Handler);
-	button_attach(&btn1, LONG_PRESS_HOLD,  BTN1_LONG_PRESS_HOLD_Handler);
-	button_attach(&btn1, LONG_PRESS_STOP,  BTN1_LONG_PRESS_STOP_Handler);
-	button_start(&btn1);
-	
-	button_init(&btn2, read_K2_pin, 0);
-	button_attach(&btn2, CLICK,            BTN2_Click_Handler);
-	button_attach(&btn2, DOUBLE_CLICK,     BTN2_DOUBLE_Click_Handler);
-	button_attach(&btn2, LONG_RRESS_START, BTN2_LONG_RRESS_START_Handler);
-	button_attach(&btn2, LONG_PRESS_HOLD,  BTN2_LONG_PRESS_HOLD_Handler);
-	button_attach(&btn2, LONG_PRESS_STOP,  BTN2_LONG_PRESS_STOP_Handler);
-	button_start(&btn2);
-	
-	button_init(&btn3, read_K3_pin, 0);
-	button_attach(&btn3, CLICK,            BTN3_Click_Handler);
-	button_attach(&btn3, DOUBLE_CLICK,     BTN3_DOUBLE_Click_Handler);
-	button_attach(&btn3, LONG_RRESS_START, BTN3_LONG_RRESS_START_Handler);
-	button_attach(&btn3, LONG_PRESS_HOLD,  BTN3_LONG_PRESS_HOLD_Handler);
-	button_attach(&btn3, LONG_PRESS_STOP,  BTN3_LONG_PRESS_STOP_Handler);
-	button_start(&btn3);
-
-	//make the timer invoking the button_ticks() interval 5ms.
-	// timer_start(button_ticks, 0, 5);	
-	
-	while(1)
-	{
-
-	}
-
-	button_stop(&btn1);
-	button_stop(&btn2);
-	button_stop(&btn3);
-}
-
-*/
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
 

button.h

@@ -15,6 +15,7 @@ typedef enum {
 	number_of_event
 }BtnEvent;
 
+
 struct Button {
 	uint16_t ticks;
 	uint8_t  state : 3;
@@ -26,15 +27,14 @@ struct Button {
 	struct Button* next;
 };
 
+
 #ifdef __cplusplus  
 extern "C" {  
 #endif  
 
 void button_init(struct Button* handle, uint8_t(*pin_level)(), uint8_t active_level);
 void button_attach(struct Button* handle, BtnEvent event, CallBackFunc cb);
-void button_handler(struct Button* handle);
-
-void button_start(struct Button* btn);
+int  button_start(struct Button* btn);
 void button_stop(struct Button* btn);
 void button_ticks(void);