STM32 learning record: play with keys to control buzzer and led

List of articles

STM32F103ZE： Punctual atomic elite board , Call the library to write independent keys , Control buzzer and LED.

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Preface

First call the library to write the control program of independent keys , Then the bit operation is carried out through the bit library encapsulated in advance , For buzzer and LED Compiling .

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One 、 Yes key.c Compiling

Look at the schematic

You can find , Key KEY_UP stay PA0 Pin 、KEY0 stay PE4、KEY1 stay PE3;

1. to key.h The creation of a header file

The procedure is as follows

#ifndef __key_H
#define __key_H
#include "sys.h"
#define KEY0 GPIO_ReadInputDataBit(GPIOE,GPIO_Pin_4)
#define KEY1 GPIO_ReadInputDataBit(GPIOE,GPIO_Pin_3)
#define KEY_UP GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0)
#define KEY0_PRESS 1
#define KEY1_PRESS 2
#define KEYUP_PRESS 3

void KEY_Init(void);
u8 KEY_Scan(u8);// Scan function 

#endif

2.key.c The program on

Click the library encapsulated in advance , find gpio.c file

GPIO Initialization and RCC The enabling function is gpio.h and rcc.h in , Double click to open them

Find the function to use
GPIO Initialization function

RCC->APB2 Enable function

KEY_Init Initialize the function program

void KEY_Init(void)
{
    		
		GPIO_InitTypeDef  GPIO_InitStruct;//
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOE,ENABLE);// Can make GPIOA、GPIOE
		GPIO_InitStruct.GPIO_Pin=GPIO_Pin_3|GPIO_Pin_4;// port 3、4
		GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU;// Pull up mode 
		GPIO_Init(GPIOE,&GPIO_InitStruct);//GPIOE initialization 
		
		GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0;
		GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPD;// Drop down mode 
		GPIO_Init(GPIOA,&GPIO_InitStruct);
}

You can see , These two functions are used , The rest are selected on this basis “ To configure ”, See what Chuan Shen is , Just configure it .

KEY_Scan() Key scan function

key_up It's a static parameter , keep key_up++,mode It's a parameter , It is used to determine the mode of keys , Is a continuous key , Or just one button （ Only press once ）; And mode by 0 continuity ,mode by 1 Only one

u8 KEY_Scan(u8 mode)// Key scan function 
{
    
		static u8 key_up=1;
		if(mode)key_up=1;// Press continuously 
		if(key_up&&(KEY0==0||KEY1==0||KEY_UP==1))
		{
    
				delay_ms(10);
				key_up=0;
				if(KEY0==0)return KEY0_PRESS;
				else if(KEY1==0)return KEY1_PRESS;
				else if(KEY_UP==1)return KEYUP_PRESS;
		}
		else if(KEY0==1&&KEY1==1&&KEY_UP==0)key_up=1;
		return 0;
}

Two 、 Yes main.c Programming

1.LED、BEEP Define header file

LED.h

The code is as follows （ Shown ）：

#ifndef __led_H
#define __led_H
#include "sys.h"
#define LED0 PBout(5)// PB5
#define LED1 PEout(5)// PE5 
void LED_Init(void);

#endif

BEEP.h

The code is as follows （ Shown ）：

#ifndef __BEEP_H
#define __BEEP_H
#include "sys.h"
#define BEEP PBout(8) // BEEP, Buzzer interface  

void BEEP_Init(void);	// initialization 

#endif

2.main.c

The code is as follows （ Shown ）：

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "beep.h"

int main(void)
 {
    
			u8 key=0;	
			delay_init();	    	 	  
			LED_Init();		  		
			BEEP_Init();  	      	
			KEY_Init();
			LED0=0;				
			while(1) 
			{
    
					key=KEY_Scan(0);	// Get the key value 
					if(key)
					{
    						   
							switch(key)
							{
    				 
									case KEYUP_PRESS:BEEP=!BEEP;break;							
									case KEY1_PRESS:LED1=!LED1;break;
									case KEY0_PRESS:LED0=!LED0;LED1=!LED1;break;
							}
					}else delay_ms(10); 
	}	 
}

3、 ... and 、 Macro definition calls library method

1.key.h The header file

The code is as follows , Shown

#ifndef __KEY_H
#define __KEY_H 
#include "stm32f10x.h"

//  Pin definition 
#define KEY1_GPIO_CLK RCC_APB2Periph_GPIOE
#define KEY1_GPIO_PORT GPIOE 
#define KEY1_GPIO_PIN GPIO_Pin_3

#define KEY0_GPIO_CLK RCC_APB2Periph_GPIOE
#define KEY0_GPIO_PORT GPIOE 
#define KEY0_GPIO_PIN GPIO_Pin_4

#define KEY_UP_GPIO_CLK RCC_APB2Periph_GPIOA
#define KEY_UP_GPIO_PORT GPIOA 
#define KEY__UP_GPIO_PIN GPIO_Pin_0

#define KEY_ON 1
#define KEY_OFF 0

void Key_GPIO_Init(void);
uint8_t Key_Scan(GPIO_TypeDef* GPIOx,uint16_t GPIO_Pin);
				    
#endif

2.key.c Programming

The code is as follows , Shown

#include "stm32f10x.h"
#include "key.h"

void Key_GPIO_Init(void)
{
    
	GPIO_InitTypeDef GPIO_InitStructure;
	
	/* Turn on the clock of the key port */
	RCC_APB2PeriphClockCmd(KEY0_GPIO_CLK|KEY1_GPIO_CLK|KEY_UP_GPIO_CLK,ENABLE);
	
	// Select the pin of the key 
	GPIO_InitStructure.GPIO_Pin = KEY0_GPIO_PIN; 
	//  Set the pin of the key as pull-up input 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; 
	// Use the structure initialization key 
	GPIO_Init(KEY0_GPIO_PORT, &GPIO_InitStructure);
	
	// Select the pin of the key 
	GPIO_InitStructure.GPIO_Pin = KEY1_GPIO_PIN; 
	// Set the pin of the key as pull-up input 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; 
	// Use the structure initialization key 
	GPIO_Init(KEY1_GPIO_PORT, &GPIO_InitStructure);	
	
	// Select the pin of the key 
	GPIO_InitStructure.GPIO_Pin =  KEY__UP_GPIO_PIN; 
	// Set the pin of the key as the pull-down input 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; 
	// Use the structure initialization key 
	GPIO_Init(KEY_UP_GPIO_PORT, &GPIO_InitStructure);	
}

uint8_t Key_Scan(GPIO_TypeDef* GPIOx,uint16_t GPIO_Pin)
{
    			
	/* Check if a key is pressed  */
	if(GPIO_ReadInputDataBit(GPIOx,GPIO_Pin) == KEY_ON )  
	{
    	 
		/* Wait for the key to release  */
		while(GPIO_ReadInputDataBit(GPIOx,GPIO_Pin) == KEY_ON);   
		return 	KEY_ON;	 
	}
	else
		return KEY_OFF;
}

3.main.c Programming

The code is as follows , Shown

#include "led.h"
#include "key.h"

 int main(void)
{
    	
	/* LED Port initialization  */
	LED_Init();
	LED0=0;
	/*  Key port initialization  */
	Key_GPIO_Init();
	
	/*  Turn the key state , If the key is pressed, it will be reversed LED */
	/* Press in turn KEY0、KEY1*/	  
	while(1)
	{
    
		if( Key_Scan(KEY1_GPIO_PORT,KEY1_GPIO_PIN) == KEY_ON  )
		{
    
			/*LED1 reverse */
			LED1=!LED1;
		} 
		
		if( Key_Scan(KEY0_GPIO_PORT,KEY0_GPIO_PIN) == KEY_ON  )
		{
    
			/*LED0 reverse */
			LED0=!LED0;
		}	
	}
}

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Four 、 Experimental phenomena

Press KEY_UP The buzzer is on , Press again to close ,KEY1 control LED1（ A green light ） The flip state of ,KEY0 control LED1 and LED0 The flip state of .

Play with the key to control the buzzer and LED