gpfa.c

来自「C和汇编语言的混合编程实验基于S3C2410的」· C语言 代码 · 共 48 行

/*  这是一个利用GPIO做跑马灯的程序
/* GPIO1到GPIO4分别对应2410的GPF4到GPF7 */
#include "2410lib.h"
#include "2410addr.h"
#include "timer.h"
//定义寄存器地址
#define GPFCON    (*(volatile unsigned *)0x56000050) //Port F control
#define GPFDAT    (*(volatile unsigned *)0x56000054) //Port F data
#define GPFUP     (*(volatile unsigned *)0x56000058) //Pull-up control F

int Main()
{
       int x=0;
    //时钟、端口、串口初始化   
    SetClockDivider(1, 1);
	SetSysFclk(DFT_FCLK_VAL);
	Port_Init();
		
	Uart_Select(0);
	Uart_Init(0, UART_BAUD);
       
       GPFCON=(GPFCON|0xFF00)&0xFFFF55FF;//GPF4--GPF7设置为output
       GPFUP|=0xFF00;   //disable GPF pull up
   while(1)
    {
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0xE0;
 	   Delay(200);
 	   __asm    //嵌入汇编指令               
 	   {
 	   	add x,x,#1
 	   	nop
 	   	nop
 	   }
       
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0xD0;
       Delay(200);
       
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0xB0;
       Delay(200);
       
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0x70;
       Delay(200);
       
       Uart_Printf("the value of x is: %d\n",x);//串口输出
       
    }
 }