STM32 key control LED

mai.c

#include "stm32f10x.h" //STM32 The header file 
#include "sys.h"
#include "delay.h"
#include "led.h"
#include "key.h"

extern unsigned char flag_1ms;

u8	sysstat=0;


int main (void)
{
    
  uint8_t key;
 
	SysTick_Config(72000000/1000);  // timing 1 millisecond 


	Led_Init();   //led gpio initialization 
	Key_Init();   // Key initialization 
	while(1)
  {
    

		if(flag_1ms==1)  //1 Once in milliseconds 
		{
    

			flag_1ms=0;
      Led_Poll();  //LED Cycle show 
      
      key = Key_Scan();

				if(key==1)
				{
    
					sysstat++;
					if(sysstat>3){
    sysstat=0;}
				}
				else if(key==2)
				{
    
					if(sysstat==0){
    sysstat=3;}
					else{
    sysstat--;}
				}
       
				switch(sysstat)
				{
    
					case 0:LED1_ON;LED2_OFF;LED3_OFF;break;   //led1  bright 
					case 1:LED2_ON;LED1_OFF;LED3_OFF;break;    //led2  bright 
					case 2:LED3_ON;LED1_OFF;LED2_OFF;break;    //led3  bright 
					case 3:Led_Poll();break;   //LED Cycle show 
				}
      }
   }
}

led.h

#ifndef __LED_H
#define __LED_H	 

#include "stm32f10x.h"

/*  Definition LED Connected GPIO port ,  The user only needs to modify the following code to change the control LED Pin  */
// R- Red 
#define LED1_GPIOB    	GPIOB			              /* GPIO port  */
#define LED1_GPIO_CLK 	    RCC_APB2Periph_GPIOB		/* GPIO Port clock  */
#define LED1_GPIO_PIN		GPIO_Pin_5			        /*  Connect to SCL Clock line GPIO */

// G- green 
#define LED2_GPIOB    	GPIOB			              /* GPIO port  */
#define LED2_GPIO_CLK 	    RCC_APB2Periph_GPIOB		/* GPIO Port clock  */
#define LED2_GPIO_PIN		GPIO_Pin_0			        /*  Connect to SCL Clock line GPIO */

// B- Blue 
#define LED3_GPIOB    	GPIOB			              /* GPIO port  */
#define LED3_GPIO_CLK 	    RCC_APB2Periph_GPIOB		/* GPIO Port clock  */
#define LED3_GPIO_PIN		GPIO_Pin_1			        /*  Connect to SCL Clock line GPIO */

// Method 1：
#define LED1_ON  GPIO_WriteBit(GPIOB,GPIO_Pin_0,Bit_RESET)   // Lighten up LED1
#define LED1_OFF GPIO_WriteBit(GPIOB,GPIO_Pin_0,Bit_SET)     // Extinguish LED1
#define LED2_ON  GPIO_WriteBit(GPIOB,GPIO_Pin_1,Bit_RESET)   // Lighten up LED2
#define LED2_OFF GPIO_WriteBit(GPIOB,GPIO_Pin_1,Bit_SET)     // Extinguish LED2
#define LED3_ON  GPIO_WriteBit(GPIOB,GPIO_Pin_5,Bit_RESET)   // Lighten up LED2
#define LED3_OFF GPIO_WriteBit(GPIOB,GPIO_Pin_5,Bit_SET)     // Extinguish LED2

	// Method 2：
//#define LED1_ON  GPIO_WriteBit(GPIOB,GPIO_Pin_0,(BitAction)(0));   // Lighten up LED1
//#define LED1_OFF GPIO_WriteBit(GPIOB,GPIO_Pin_0,(BitAction)(1));    // Extinguish LED1
//#define LED2_ON  GPIO_WriteBit(GPIOB,GPIO_Pin_1,(BitAction)(0));  // Lighten up LED2
//#define LED2_OFF GPIO_WriteBit(GPIOB,GPIO_Pin_1,(BitAction)(1));   // Extinguish LED2
//#define LED3_ON  GPIO_WriteBit(GPIOB,GPIO_Pin_5,(BitAction)(0));   // Lighten up LED2
//#define LED3_OFF GPIO_WriteBit(GPIOB,GPIO_Pin_5,(BitAction)(1));     // Extinguish LED2	
	
		// Method 3：
//#define LED1_OFF  GPIO_SetBits(GPIOB,GPIO_Pin_0);    //  LED The lights are high level 
//#define LED1_ON GPIO_ResetBits(GPIOB,GPIO_Pin_0);    //  LED The lights are all low level 
//#define LED2_OFF  GPIO_SetBits(GPIOB,GPIO_Pin_1);    //  LED The lights are high level 
//#define LED2_ON   GPIO_ResetBits(GPIOB,GPIO_Pin_1);  //  LED The lights are all low level 
//#define LED3_OFF GPIO_SetBits(GPIOB,GPIO_Pin_5);     //  LED The lights are high level 
//#define LED3_ON  GPIO_ResetBits(GPIOB,GPIO_Pin_5);   //  LED The lights are all low level 
	


void Led_Init(void);   //led gpio initialization 

void	Led_OFF(void);  // LED3 Total destruction  
void	Led_Poll(void); //LED Cycle show 

#endif /* __LED_H */

led.c

#include "led.h"

typedef	struct  //led Variable members 
{
    
	u8 timer;
  u16 num;
     
}led_ctr_type;

led_ctr_type led_ctr = {
    0,0};  // Variable initialization 

void Led_Init(void)
{
    		
		/* Define a GPIO_InitTypeDef Type of structure */
		GPIO_InitTypeDef GPIO_InitStructure;

		/* Turn on LED dependent GPIO Peripheral clock */
		RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);
		/* Choose what you want to control GPIO Pin */
		GPIO_InitStructure.GPIO_Pin = LED1_GPIO_PIN|LED2_GPIO_PIN|LED3_GPIO_PIN;	

		/* Set pin mode to universal push pull output */
		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;   

		/* Set the pin rate to 50MHz */   
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 

		/* Call library function , initialization GPIO*/
		GPIO_Init(GPIOB, &GPIO_InitStructure);	
}


void	Led_OFF(void)  // LED3 Total destruction  
{
    
	LED1_OFF; 
  LED2_OFF;
  LED3_OFF;

}

void	Led_Poll(void)  // LED Cycle show 
{
    

			switch(led_ctr.timer)   //index Every time 500 Millisecond plus once , Alternate execution 500 millisecond case(X)  Jump once 
			{
    
				case 0:LED1_ON;  break;  // LED1 bright 
				case 1:Led_OFF(); break;   // LED Total destruction 
				case 2:LED2_ON;break;     //LED2 bright 
				case 3:Led_OFF(); break;   // LED Total destruction 
				case 4:LED3_ON;break;     //LED3 bright 
				case 5:Led_OFF(); break;   // LED Total destruction 
			}
			
		led_ctr.num++;
		if(led_ctr.num>=500)   // timing 500 millisecond 
		{
    
			led_ctr.num=0;       
			led_ctr.timer++;   //index Every time 500 Millisecond plus once 
			if(led_ctr.timer>5){
    led_ctr.timer=0;}   //timer Set less than 5, because case Only write 5
		}
	}

key.h

#ifndef __KEY_H
#define __KEY_H	 
#include "sys.h"
#include "led.h"
#include "delay.h"

#define	KEY1	GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0)
#define	KEY2	GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_13)

void Key_Init(void);// initialization 
u8 Key_Scan(void);	// Key scan function 
				    
#endif

key.c

#include "key.h"

void Key_Init(void){
     // Interface initialization of microswitch 
	GPIO_InitTypeDef  GPIO_InitStructure; // Definition GPIO Initialization enumeration structure 	
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);  
     
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // Select pin number （0~15 or all）                        
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; // choice IO How the interface works  // Pull down resistance          
	GPIO_Init(GPIOA,&GPIO_InitStructure);			

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; // Select pin number （0~15 or all）                        
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; // choice IO How the interface works  // Pull down resistance          
	GPIO_Init(GPIOC,&GPIO_InitStructure);			
}

u8 Key_Scan(void)		// Key scan function 
{
    
	static	u16 timer1=0,timer2=0;
	// Key 1 Handle 
	if(KEY1==1)
	{
    
		timer1++;
		if(timer1==10)	// timing 10 Millisecond return KEY1
		{
    
			return(1);
		} 
    else if(timer1==1000){
    timer1=500;return(1);} // Otherwise, press and hold to return the valid value 
	}
	else{
    timer1=0;}
	// Key 2 Handle 
	if(KEY2==1)
	{
    
		timer2++;
		if(timer2==10)	// timing 10 Millisecond return KEY1
		{
    
			return(2);
		} 
    else if(timer2==1000){
    timer2=500;return(2);} // Otherwise, press and hold to return the valid value 
	}
	else{
    timer2=0;}

	return(0);
}