【嵌入式】——arm裸机开发 step by step 之 按键控制 LED 和 蜂鸣器

一、arm-9 TQ2440

　key.h

#ifndef __KEY_H__
#define __KEY_H__

#define GPFCON (*(volatile unsigned long *)0x56000050)
#define GPFDAT (*(volatile unsigned long *)0x56000054)

extern void key_init(void);
extern int key1(void);
extern int key2(void);
extern int key3(void);
extern int key4(void);

#endif

 key.c

#include "key.h"

void key_init(void){
    //设置key 1 2 3 4 为输入引脚
    GPFCON = ~0x3 & ~(0x3<<4) & ~(0x3<<8) & ~(0x3<<2);    
}

int key1(void){
    if(GPFDAT & (0x1<<1)){
        return 0;
    }
    else{
        return 1;
    }
}

int key2(void){
    if(GPFDAT & (0x1<<4)){
        return 0;
    }
    else{
        return 1;
    }
}


int key3(void){
    if(GPFDAT & (0x1<<2)){
        return 0;
    }
    else{
        return 1;
    }
}

int key4(void){
    if(GPFDAT & (0x1)){
        return 0;
    }
    else{
        return 1;
    }
}

buzzer.h

#ifndef __BUZZER_H__
#define __BUZZER_H__

#define GPBCON (*(volatile unsigned long *)0x56000010)
#define GPBDAT (*(volatile unsigned long *)0x56000014)

extern void buzzer_init(void);
extern void buzzer_on(void);
extern void buzzer_off(void);

#endif

 buzzer.c

#include "buzzer.h"

void buzzer_init(void){
    GPBCON &= ~0x3;
    GPBCON |= 0x1;
}

void buzzer_on(void){
    GPBDAT |= 1;    
}

void buzzer_off(void){
    GPBDAT &= ~1;
}

led.h

#ifndef __LED_H__
#define __LED_H__

#define GPBCON (*(volatile unsigned long*)0x56000010)
#define GPBDAT (*(volatile unsigned long*)0x56000014)

extern void led_init(void);
extern void led1_on(void);
extern void led1_off(void);
extern void led2_on(void);
extern void led2_off(void);
extern void led3_on(void);
extern void led3_off(void);
extern void led4_on(void);
extern void led4_off(void);

#endif

led.c

#include "led.h"

//初始化led寄存器
void led_init(void){
    //设置 led 1 2 3 4 为输出引脚
    GPBCON &= ~(0xFF<<10);
    GPBCON = (1<<10) | (1<<12) | (1<<14) | (1<<16);
}

void led1_on(void){
    //GPBDAT &= ~(1<<5);
    GPBDAT &= ~(1<<5); 
}
void led1_off(void){
    GPBDAT |= 1<<5;
}

void led2_on(void){
    GPBDAT &= ~(1<<6); 
}
void led2_off(void){
    GPBDAT |= (1<<6);
}

void led3_on(void){
    GPBDAT &= ~(1<<7);
}
void led3_off(void){
    GPBDAT |= (1<<7);
}


void led4_on(void){
    GPBDAT &= ~(1<<8);
}
void led4_off(void){
    GPBDAT |= (1<<8);
}

main.c

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

void delay(void);

int main(void){
    led_init();
    key_init();
    //蜂鸣器
    buzzer_init();
    while(1){
        if(key1()){
            led1_on();
            led2_on();
        }
        else{
            led1_off();
            led2_off();
        }
        if(key2()){
            led3_on();
            led4_on();
        }
        else{
            led3_off();
            led4_off();
        }
        if(key3()){
            buzzer_on();
        }
        else{
            buzzer_off();
        }
    }
}

void delay(void){
    int i;
    for(i = 0; i < 0xf000; i++){
        ;
    }
}

led.lds

SECTIONS
{
    . = 0x30000000;
    .text :{
       main.o (.text);
       *.o (.text);
    }
    .data :{
        *.o (.data);
    }
    __bss_start = .;
    .bss :{
        *.o (.bss);
    }
    __end = .;
};

Makefile

CC=arm-linux-gcc
LD=arm-linux-ld
OBJ=arm-linux-objcopy
keyled_c:keyled_c.o
    $(LD) -nostartfiles -nostdlib -T led.lds -e main -o keyled_c keyled_c.o
    $(OBJ) -O binary keyled_c keyled_c.bin
keyled_c.o:keyled_c.c
    $(CC) -march=armv5te -nostdlib -c -o keyled_c.o keyled_c.c
clean:
    @rm -vf keyled_c.o keyled_c keyled_c.bin

上面的 led.lds 是设置代码和数据段的地址区

二、arm-A8 S5PV210

#define GPC0CON (*(volatile unsigned long*)0xE0200060)
#define GPC0DAT (*(volatile unsigned long*)0xE0200064)

#define GPH0CON (*(volatile unsigned long*)0xE0200C00)
#define GPH0DAT (*(volatile unsigned long*)0xE0200C04)

#define GPD0CON (*(volatile unsigned long*)0xE02000A0)
#define GPD0DAT (*(volatile unsigned long*)0xE02000A4)

#define GPD01OUT (1<<(4*1))

#define GPC03OUT (1<<(3*4))
#define GPC04OUT (1<<(4*4))

#define GPH00IN ~(0xF<<(4*0))
#define GPH01IN ~(0xF<<(4*1))
int main(void){
    //设置led1 2 GPC0CON 为输出引脚
    GPC0CON = GPC03OUT | GPC04OUT;
    //设置按键1 2 GPH0CON 为输入引脚
    GPH0CON = GPH00IN & GPH01IN;
    //设置蜂鸣器 GPD0CON 为输出引脚
    GPD0CON = GPD01OUT;

    while(1){
        if(GPH0DAT & 0x1){
            GPC0DAT = 0x00;
            GPD0DAT = 0x00;
        }
        else{
            GPC0DAT = 0x08;
            GPD0DAT = 0x02;
        }
        if(GPH0DAT & 0x02){
            GPC0DAT = 0x00;
        }
        else{
            GPC0DAT = 0x10;
        }
    }
}

　　以上的宏定义都是根据开发板电路图找到CPU相对应的管脚，然后设置管脚就可以实现相应的功能。

Makefile：

CC=arm-linux-gcc
LD=arm-linux-ld
OBJ=arm-linux-objcopy
keyled_c:keyled_c.o
    $(LD) -nostartfiles -nostdlib -Ttext=0x20008000 -e main -o keyled_c keyled_c.o
    $(OBJ) -O binary keyled_c keyled_c.bin
keyled_c.o:keyled_c.c
    $(CC) -march=armv5te -nostdlib -c -o keyled_c.o keyled_c.c
clean:
    @rm -vf keyled_c.o keyled_c keyled_c.bin