【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<<) & ~(0x3<<) & ~(0x3<<);
 }

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

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

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

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

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 |= ;
 }

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

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<<);
     GPBCON = (<<) | (<<) | (<<) | (<<);
 }

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

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

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

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

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(){
         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 = ; 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(){
         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