虚拟机环境:Oracle VM VirtualBox
Linux系统:ubuntu_14.04.6
交叉编译工具:[100ask分享的所有文件](https://eyun.baidu.com/s/3b1UtLc)
100ask分享的所有文件 > 002_JZ2440资料光盘_20180516(免费) > 资料光盘 > A盘 > tools.zip > arm-linux-gcc-4.3.2.tar.bz2
gcc-3.4.5-glibc-2.3.6/bin
第一步:查看原理图
left | middle | right |
---|---|---|
nLED4 | nLED2 | nLED1 |
GPF6 | GPF5 | GPF4 |
输出低电平点亮LED灯
输出高电平熄灭LED灯
left | middle | right |
---|---|---|
EINT0 | EINT2 | EINT11 |
GPF0 | GPF2 | GPG3 |
抬起为高电平
按下为低电平
第二步:查看芯片手册
相应引脚配置为输出
输出低电平
第三步:编写程序
crt0.S:
.text
.global _start
_start:
ldr r0,=0x53000000
mov r1,#0x0
str r1,[r0]
ldr sp,=1024*4
bl main
halt_loop:
b halt_loop
key_led.c:
#define GPFCON (*(volatile unsigned long *)0x56000050)
#define GPFDAT (*(volatile unsigned long *)0x56000054)
#define GPGCON (*(volatile unsigned long *)0x56000060)
#define GPGDAT (*(volatile unsigned long *)0x56000064)
/*
nLED1 GPF4
nLED2 GPF5
nLED4 GPF6
EINT0 GPF0
EINT2 GPF2
EINT11 GPG3
EINT19 GPG11
*/
int main(void)
{
unsigned long dwDat;
GPFCON = 0x00001500;
GPGCON = 0x00000000;
while (1) {
dwDat = GPFDAT;
if (dwDat & (1<<0))
GPFDAT |= (1<<6);
else
GPFDAT &= ~(1<<6);
if (dwDat & (1<<2))
GPFDAT |= (1<<5);
else
GPFDAT &= ~(1<<5);
dwDat = GPGDAT;
if (dwDat & (1<<3))
GPFDAT |= (1<<4);
else
GPFDAT &= ~(1<<4);
if (dwDat & (1<<11))
GPFDAT |= (1<<4) | (1<<5) | (1<<6);
else
GPFDAT &=~((1<<4) | (1<<5) | (1<<6));
}
return 0;
}
第四步:编写makefile
makefile:
ARM_LINUX_XXX=/home/xlbtlmy/Desktop/ARM_Linux/gcc-3.4.5-glibc-2.3.6/bin
CC=$(ARM_LINUX_XXX)/arm-linux-gcc
LD=$(ARM_LINUX_XXX)/arm-linux-ld
OBJCOPY=$(ARM_LINUX_XXX)/arm-linux-objcopy
OBJDUMP=$(ARM_LINUX_XXX)/arm-linux-objdump
TARGET=$(OPT)
src_c=$(shell ls *.c)
objs_c=$(patsubst %.c,%.o,$(src_c))
src_s=$(shell ls *.S)
objs_s=$(patsubst %.S,%.o,$(src_s))
objs=$(objs_c) $(objs_s)
BIN=$(TARGET).bin
ELF=$(TARGET).elf
DIS=$(TARGET).dis
$(BIN):$(objs)
$(LD) -Ttext 0x00000000 crt0.o key_led.o -o $(ELF)
$(OBJCOPY) -O binary -S $(ELF) $(BIN)
$(OBJDUMP) -D -m arm $(ELF) > $(DIS)
%.o:%.c
$(CC) -c -o $@ $<
%.o:%.S
$(CC) -c -o $@ $<
.PHONY:clean
clean:
rm -f *.o *.bin *.elf *.dis
make OPT=key_led
第五步:烧录运行
eop.bat:
@echo off
:JTAG(0:OpenJTAG 1:DongleJTAG 2:Wiggler)
SET JTAG=0
:CPU(0:S3C2410 1:S3C2440 2:S3C6410)
SET CPU=1
:Flash(0:Nand 1:Nor)
SET Flash=0
:Access(0:Write 1:Read)
SET Access=0
:Offset()
SET Offset=0
:File()
SET File=key_led.bin
oflash %JTAG% %CPU% %Flash% %Access% %Offset% %File%
pause
注意问题:
1.编写makefile时,要注意链接时,要将crt0.o放在key_led.o前面,否则现象异常
第五步:观察实验现象
按对应位置的按键,对应位置的LED亮