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
