第一个Arm程序led(ASD1.2)

打开DebugRel Settings（ALT + F7），选择”ARM Linker”， 选择”Linktype为Simple”，将”Simple image”的”RO Base”改为0x30000000。设置“Equvalent Command Line”为：

-info totals -entry 0x30000000 -ro-base 0x30000000 -first Init.o(Init)

//init.s

    IMPORT main

    CODE32

    AREA Init,CODE,READONLY

    ENTRY

    ldr r0, =0x53000000

    mov r1, #0x0

    str r1, [r0]

    ldr sp, =1024 * 4

    

    bl main

main_loop

    b main_loop

    END

//main.c

#define GPBCON (*(volatile unsigned long *)0x56000010)

#define GPBDAT (*(volatile unsigned long *)0x56000014)

#define LED1 (1 << (5 * 2))

#define LED2 (1 << (6 * 2))

#define LED3 (1 << (7 * 2))

#define LED4 (1 << (8 * 2))

#define LEDS (LED1 | LED2 | LED3 | LED4)

void delay(int dly);

int main()

{

    int flag = 0;

    GPBCON = LEDS;

    

    while (1) {

        if (flag) {

            GPBDAT = 0xffffffff;

            flag = 0;

        } else {

            GPBDAT = 0x00000000;

            flag = 1;

        }

        delay(120);

    }

    return 0;

}

void delay(int dly)

{

    int i;

    for (;dly > 0; dly--)

        for (i = 0;i < 10000; i++);

}