OK6410之裸机led

 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 }

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<   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!!

 

 

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