复件 gpio_test.c

利用开发板上的/dev/mem设备,进行内存映射,驱动cpu的GPIO口,点亮和熄灭led灯.附makefile文件

//ppc编译方法:/eldk/usr/ppc-linux/bin/gcc -o gpio_test.exe gpio_test.c
//ppc编译方法:${CROSS_COMPILE}gcc -o gpio_test.exe gpio_test.c
/***************************************************************************
FileName:	gpio_test.c				copyright:	富通科技
WriteDate:	2007-02-06				AUTHOR:		陆冲之
Version:	0.1						Last Modify:2007-02-06
Content:	这里放置了CLI_Menu的函数
***************************************************************************/
//#include <common.h>
//#include <exports.h>

//#include <common.h>			/*include目录下*/
//#include <command.h>		/*include目录下*/
//#include <asm/processor.h>	/*include/asm-ppc目录下??*/
//#include <spi.h>			/*include目录下*/
//
//#include "gpio.h"
//#include <asm/types.h>
//#include <asm/io.h>

#define __KERNEL__
//#define CONFIG_4xx
//#include <ppc4xx.h>
//#include <common.h>
//#include <command.h>
//#include <asm/io.h>


#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>

/*********************************************************************************
Func Name	:int main(int argc, char* argv[])
Content		:测试GPIO
In  Param	:argc	:输入参数个数量
Out Param	:argv	:输入参数值数组
return		:0		:正常返回
			 其它	:参看程序
Write Date	:2007-02-06							AUTHOR	:陆冲之
Last Modify	:2007-02-06
return to   :NONE
********************************************************************************/
#define GPIO_REGISTER unsigned int
int main(int argc, char* argv[])
{	
	int fd;
	char dev_name[] = "/dev/mem";

	char *start;

	printf("test 7\n");
	//printf("%u\n",offset);

	fd = open(dev_name,O_RDWR);
	if(fd<0)
	{
		printf("open %s is error\n",dev_name);
		return -1 ;
	}
	start = mmap( NULL, 4, PROT_READ|PROT_WRITE, MAP_SHARED,fd, 0xEF600700/getpagesize());
	if(start==NULL || start==MAP_FAILED)
	{
		printf("gpio base mmap is error\n");
		munmap(start,4); /*解除映射*/
		close(fd);
		return -1;
	}
	//*gpio_base  = (*gpio_base & ~0x00000002);
	printf("%u\n",start);
	munmap(start,4); /*解除映射*/
	close(fd);




	//unsigned int *p = (unsigned int*)ioremap(0xEF600700, 4);

	//unsigned int data = readl(0xEF600700);
	//writew((data&= ~0x00000002) ,0xEF600700);

	//unsigned int add=ioremap(0xEF600700,4); 
	//printk("<1>ioremap 0x%x\n",add); 
	/*unsigned int *p;
	unsigned int data;
	p = (int *)0xEF600700;
	data = *p;
	printf("%u",data);

	printf("hello,world!\n");
	*p &= ~0x00000002;*/
	//out32(GPIO0_OR, in32(GPIO0_OR) & ~0x00000002);
	//*(volatile ulong *)GPIO0_OR &= ~0x00000002;
	return 0;
}