stm32寄存器版学习笔记01 GPIO口的配置(LED、按键)

//led.c                    
//LED IO口初始化
void LED_Init(void)
{
    RCC->APB2ENR|=1<<2;      //使能PORTA时钟        
    RCC->APB2ENR|=1<<5;      //使能PORTD时钟         
    GPIOA->CRH&=0XFFFFFFF0; 
    GPIOA->CRH|=0X00000003;//PA8推挽输出     
  GPIOA->ODR|=1<<8;                //PA8输出高
                                              
    GPIOD->CRL&=0XFFFFF0FF;
    GPIOD->CRL|=0X00000300;//PD2推挽输出
    GPIOD->ODR|=1<<2;         //PD2输出高
}

//led.h
#ifndef __LED_H
#define __LED_H     
#include "sys.h"

//LED端口定义
#define LED0 PAout(8)    // PA8
#define LED1 PDout(2)    // PD2    

void LED_Init(void);    //初始化                         
#endif 

//main.c
#include "sys.h"
#include "usart.h"        
#include "delay.h"    
#include "led.h" 
int main(void)
{         
    Stm32_Clock_Init(9); //系统时钟设置
    delay_init(72);             //延时初始化
    LED_Init();        //初始化与LED连接的硬件接口
    while(1)
    {
        LED0=0;
        LED1=1;
        delay_ms(300);
        LED0=1;
        LED1=0;
        delay_ms(300);
    }     
}

//key.c
#include "key.h"
#include "delay.h"
//按键初始化函数
//PA0 PA15 PC5设置成输入
void KEY_Init(void)
{
    RCC->APB2ENR|=1<<2;     //使能PORTA时钟
    RCC->APB2ENR|=1<<4;     //使能PORTC时钟
    JTAG_Set(SWD_ENABLE);    //关闭JTAG 开启SWD PA15占用了JTAG一个口
    GPIOA->CRL&=0XFFFFFFF0;    //PA0设置成输入  
    GPIOA->CRL|=0X00000008;   
    GPIOA->CRH&=0X0FFFFFFF;    //PA15设置成输入
    GPIOA->CRH|=0X80000000;              
    GPIOA->ODR|=1<<15;           //PA15上拉 PA0默认下拉
    GPIOC->CRL&=0XFF0FFFFF;    //PC5设置成输入  
    GPIOC->CRL|=0X00800000;   
    GPIOC->ODR|=1<<5;           //PC5上拉
} 
//按键处理函数
//mode:0不支持连续按;1,支持连续按
//响应优先级KEY0>KEY1>WK_UP
u8 KEY_Scan(u8 mode)
{     
    static u8 key_up=1;//按键按松开标志
    if(mode)key_up=1;  //支持连按      
    if(key_up&&(KEY0==0||KEY1==0||WK_UP==1))
    {
        delay_ms(10);//去抖动
        key_up=0;
        if(KEY0==0)
                    return KEY0_PRES;
        else if(KEY1==0)
                    return KEY1_PRES;
        else if(WK_UP==1)
                    return WKUP_PRES; 
    }else if(KEY0==1&&KEY1==1&&WK_UP==0)
            key_up=1;          
    return 0;// 无按键按下
}

//key.h
#ifndef __KEY_H
#define __KEY_H     
#include "sys.h"

#define KEY0_PRES    1        //KEY0按下
#define KEY1_PRES    2        //KEY1按下
#define WKUP_PRES    3        //WK_UP按下

#define KEY0  PCin(5)          //PC5
#define KEY1  PAin(15)         //PA15 
#define WK_UP PAin(0)          //PA0  WK_UP
     
void KEY_Init(void);        
u8 KEY_Scan(u8 mode);        
#endif

//main.c
#include "sys.h"
#include "usart.h"        
#include "delay.h"    
#include "led.h" 
#include "key.h" 

int main(void)
{         
    u8 t;      
    Stm32_Clock_Init(9);     
    delay_init(72);            
    LED_Init();                   
    KEY_Init();          
    LED0 = 0;                    
    while(1)
    {
        t=KEY_Scan(0);        
        switch(t)
        {                 
            case KEY0_PRES:
                LED0=!LED0;
                break;
            case KEY1_PRES:
                LED1=!LED1;
                break;
            case WKUP_PRES:                
                LED0=!LED0;
                LED1=!LED1;
                break;
            default:
                delay_ms(10);    
        } 
    }         
}