.globl _start _start: @因为这里的标号是程序的入口，一定要用 _start ， @否则链接器将找不到程序的入口 ldr r1, 0xE0200280 @设置GPJ2CON的bit[0:15]，让GPJ2_0、GPJ2_1、GPJ2_2、GPJ2_3 ldr r0, 0x00001111 @都作为输出引脚 str r0, [r1] ldr r1, 0xE0200284 @设置GPJ2DAT的bit[0:3]，让GPJ2_0、GPJ2_1、GPJ2_2、GPJ2_3 mov r0,#0 @引脚输出低电平，LED亮 str r0, [r1] halt: @让CPU一直执行这条指令，防止PC指针跑飞 b halt

1.led_S\Makefile
.......\mktools.c
.......\start.S
1.led_S

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