4412裸机程序按键控制led灯

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4412裸机程序按键控制led灯

在ubuntu中写的

c语言代码：

#define GPX2CON (*(volatile unsigned long *) 0x11000c40)#define GPX2DAT (*(volatile unsigned long *) 0x11000c44)#define GPL2CON (*(volatile unsigned long *) 0x11000100)#define GPL2DAT (*(volatile unsigned long *) 0x11000104)#define GPK1CON (*(volatile unsigned long *) 0x11000060)#define GPK1DAT(*(volatile unsigned long *) 0x11000064)void delay(int r0){volatile int count = r0;while(count--);}void main(){GPX2CON = 0x00000003;GPL2CON = 0x00000001;GPK1CON = 0x00000010;while(1){if((GPX2DAT & 0x01) == 1){ GPL2DAT = 1;GPK1DAT = 0x2;}if((GPX2DAT & 0x01) == 0){GPL2DAT = 0;GPK1DAT = 0;}}}

汇编代码：

.global _start_start:        //disable watch dog        ldr     r0, =0x10060000        mov     r1, #0        str     r1, [r0]        //turn on icache        mrc     p15, 0, r0, c1, c0, 0        //bic   r0, r0, #0x00002300     /* clear bits 13, 9:8 (--V- --RS) */        //bic   r0, r0, #0x00000087     /* clear bits 7, 2:0 (B--- -CAM) */        //orr   r0, r0, #0x00000002     /* set bit 2 (A) Align */        //orr   r0, r0, #0x00001000     /* set bit 12 (I) I-Cache */#ifdef CONFIG_SYS_ICACHE_OFF        // clear bit 12 (I) I-cache        bic     r0, r0, #0x00001000#else        // set bit 12 (I) I-cache        orr     r0, r0, #0x00001000#endif        mcr     p15, 0, r0, c1, c0, 0        //mcr p15, 0, r0, c7, c5, 0     @ invalidate icache        //set stack        ldr     sp, =0x02050000        bl      mainhalt:        b halt

makefile：

key.bin: start.o key.o        arm-none-linux-gnueabi-ld -Ttext 0x0 -o key.elf $^        arm-none-linux-gnueabi-objcopy -O binary key.elf key.bin        arm-none-linux-gnueabi-objdump -D key.elf > key_elf.dis%.o : %.S        arm-none-linux-gnueabi-gcc -o $@ $< -c -nostdlib%.o : %.c        arm-none-linux-gnueabi-gcc -o $@ $< -c -nostdlibclean:        rm *.o *.elf *.bin *.dis  -f

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