嵌入式Linux交叉开发环境
开发主机(Host)
目标机(Target)
连接介质
汇编程序:
.text
@设置LED灯的配置寄存器 GPX2CON7 为输出状态
ldr r0,=0x11000c40
ldr r1,[r0]
bic r1,#0xf0000000
orr r1,#0x10000000
str r1,[r0]
loop:
@设置LED灯输出高电平 GPX2DAT
ldr r0,=0x11000c44
ldr r1,[r1]
orr r1,#0x80
str r1,[r0]
bl delayis
@ 设置LED灯输出低电平
ldr r0,=0x11000c44
ldr r1,[r0]
ldr r1,#0x80
str r1,[r0]
bl delayis
b loop
delayis:
ldr r4,=0x1fffffff
delayis_loop:
sub r4,r4,#1
cmp r4,#0
bne delayis_loop
mov pc,lr
.end
Makefile :
CROSS = arm-none-linux-gnueabi-
CC=$(CROSS)gcc
LD=$(CROSS)ld
OBJCOPY=$(CROSS)objcopy
all:led.s
$(CC) -g -c -o led.o led.s
$(LD) led.o -Ttext 0x40001000 -o led.elf
$(OBJCOPY) -O binary -S led.elf led.bin
$(CROSS)objdump -D led.elf > led.dis
clean:
rm -f *.o *.elf *.bin *.dis
环境变量 :
export PATH=/home/linux/gcc-4.6.4/bin:$PATH