Blue Bridge Cup stm32g431 - three lines of code for keys (long press, short press, click, double click)

Three lines of code for the key

key_value = KEY_Scan(); // Read the key value of the key 
key_up = key_value & (key_old ^ key_value);	// The rising edge of the key is detected   Only effective at the moment when the key is lifted   All other moments are null and void 
key_down = ~key_value & (key_old ^ key_value);	// The falling edge of the key is detected   It is only effective at the moment when the key is pressed   All other moments are null and void 
key_old = key_value;	// Record the key value after the last key press 

Long press of the key 、 Short press

 Long press the key 、 It's easy to follow a short train of thought , When the first key is pressed key_down The falling edge starts timing , Given a timing time , If in this plan 
 Detected within the time key_up Rising edge （ Means the key is released ）, Short press . If... Is not detected within this timing time key_up Rising edge , be 
 For long press .

uint8_t KEY_Time_Count;
uint8_t key_value,key_up,key_down,uc_Key_Value;
static uint8_t key_old;

void KEY_Proc(void)
{
    
	if(uwTick - uwTick_KEY_Set_Point<10) return;	// Deceleration function 
		uwTick_KEY_Set_Point=uwTick;
		
	
	key_value = KEY_Scan();
	key_up = key_value & (key_old ^ key_value);
	
	key_down = ~key_value & (key_old ^ key_value);
	key_old = key_value;
	
	if(key_down)	// When a key is pressed 
	{
    
		KEY_Time_Count = 0;  Clear the timer   Time from zero   Here a basic timer is used for timing 
	}
	
	if(KEY_Time_Count < 10) // If the timing time is less than 1s  Short press 
	{
    
		switch(key_up) // Judge whether the key is lifted   Select the key value to execute the corresponding program of short press 
		{
    
			case 1:
				ucLed = 0xFF;
				break;

		}
	}
	else // Long press   Timing time exceeded 1s
	{
    
		switch(key_value) // Judge whether the key is pressed   Select the key value of the key to perform the corresponding function 
		{
    
			case 1:
				ucLed = 0x00;
				break;
		}
		
	}

//*** Basic timer 6 The update callback function of is configured as 100ms Updated once 
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    
	if(htim->Instance == TIM6)
	{
    
		KEY_Time_Count++;	// Every time 100ms Count plus 1
		HAL_TIM_Base_Start_IT(&htim6);
	}
}

Key click 、 double-click

 Click the key 、 Double click the train of thought and long press 、 The short press is similar . Start timing at the rising edge after the first key press , To press the key for the second time 
 During this period of time , Click... If the time exceeds the specified time . If the falling edge is detected within the specified time, it is double-click .

uint8_t key_value,key_up,key_down,uc_Key_Value;
static uint8_t key_old;
uint8_t key_down_num;
uint8_t  KEY_Pressed_Num_Time_Count;

void KEY_Proc(void)
{
    
	if(uwTick - uwTick_KEY_Set_Point<10) return;	// Deceleration function 
		uwTick_KEY_Set_Point=uwTick;	// Every time 10ms Scan once 
		
	
	key_value = KEY_Scan();
	key_up = key_value & (key_old ^ key_value);
	
	key_down = ~key_value & (key_old ^ key_value);
	key_old = key_value;
	
	if(key_up) // When the key is pressed and lifted for the first time  
	{
    
		if(key_down_num == 0)
			key_down_num = 1; // Record that the first key has been pressed 
	}
	
	if(key_down_num == 1) // When the key is pressed and lifted for the first time   Start timing 
	{
    
		KEY_Pressed_Num_Time_Count += 10; 
		if(KEY_Pressed_Num_Time_Count >= 150) // When the key is pressed 1.5s The second press of the key is not detected after time - single click 
		{
    
			switch(key_old)
			{
    
				case 2:
					ucLed = 0x80;
					break;
				
			}
			key_down_num = 0;	// Zero clearing 
			KEY_Pressed_Num_Time_Count = 0;	// Zero clearing 
		}
		
	}
	
	if(key_down)	// When a key press is detected - double-click 
	{
    
		if(key_down_num == 1)	// When the key is pressed for the first time 
		{
    
			switch(key_down)
			{
    
				case 2:
					ucLed = 0x01;
					break;
				
			}
			KEY_Pressed_Num_Time_Count = 0; 
			key_down_num = 0;
		}
	}
	
}