OK6410之裸机led

来源：互联网发布：武汉java达内传智播客编辑：程序博客网时间：2024/04/30 04:58

init.s文件：

PRESERVE8
    IMPORT main
AREA |C$$code|, CODE, READONLY
global start
start
    ;/* 硬件相关的设置 */
    ;/* Peri port setup */
    ldr r0, =0x70000000
    orr r0, r0, #0x13
    mcr p15,0,r0,c15,c2,4     ; //@ 256M(0x70000000-0x7fffffff)

;/* 关看门狗 */
;/* 往WTCON(0x7E004000)写0 */

ldr r0, =0x7E004000
mov r1, #0
str r1, [r0]

;/*堆栈*/
    ldr sp,=8*1024     ;//@此时堆栈的大小不能大于8K，SRAM只有8K
bl main

halt
b halt

END

main.c文件：

#define rGPMCON          (*(volatile unsigned *)(0x7F008820))
#define rGPMDAT          (*(volatile unsigned *)(0x7F008824))
#define rGPMPUD          (*(volatile unsigned *)(0x7F008828))

void msDelay(int time)
{
    volatile unsigned int i,j;
    for(i = 0; i < 20; i++) ;//如果是532M的时钟，应该用2000000
      for(j=0; j<time; j++);
}

void delay()
{
volatile int i = 0x10000;
while (i--);
}

void GPIO_Init(void)
{
rGPMCON = 0x11111;
rGPMPUD = 0x00;
rGPMDAT = 0X1F;
}

void LedTest(void)
{
volatile unsigned int i;
while (1)
{
  for(i=0; i<4; i++)
  {
   rGPMDAT = ~(1<<i);
  delay();
  }

}
}
void main(void)
{
GPIO_Init();
LedTest();
while(1);
}

编译：

RVDS需要进行设置一下

1.target settings->post-linker->arm realview fromELF

2.language settings->arm1176JZF-S

3.language compiler->arm1176JZF-S

4.realview linker->simple->0x50000000

->Image entry point->0x50000000

->init.o

5.realview fromelf->output file name->demo.bin
操作步骤：：

首先切换到SD卡的uboot：

1.dnw 50008000

2.把文件通过USB传输进来

3.nand erase 0 100000

4.nand write.uboot 50008000 0 100000

5.切换到nand启动，效果就出来了！！