linux寄存器读写工具

gpio_01

已于 2022-04-15 09:52:10 修改

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分类专栏： linux 文章标签： linux

于 2022-04-12 15:44:58 首次发布

本文链接：https://blog.youkuaiyun.com/gpio_01/article/details/124125828

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这个程序实现了对设备内存的读写操作。通过命令行参数指定操作类型（读或写）、地址和值（如果适用）。它打开/dev/mem文件，映射内存区域，执行指定的操作，然后解除映射并关闭文件。

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <string.h>
#include <sstream>
#include <iostream>

using namespace std;

static int dev_fd;
bool isWriOrRead = true;

int String2int(char *strIn)
{
	int outDat = -1;
	if (strIn != NULL)
	{
		string str1 = strIn;
		stringstream ss;
		ss << str1;
		ss >> outDat;

	}
	return outDat;
}
int main(int argc, char **argv)
{
	printf("reg change test-%s-%s-%s!\n", argv[1], argv[2], argv[3]);
    dev_fd = open("/dev/mem", O_RDWR | O_NDELAY);
    if (dev_fd < 0)
    {
        printf("open(/dev/mem) failed.");
        return 0;
    }
	if (!strcmp(argv[1], "read"))
	{
		isWriOrRead = true;
	}
	else if (!strcmp(argv[1], "write"))
	{
		isWriOrRead=false;
	}
	else
	{
		printf("command error!\n sample:himm read 0x80000000\n himm write 0x80000000 0x01\n");
		return 0;
	}
	long regAddr=0x00;
	long regVal = 0x00;
	sscanf(argv[2],"%x", &regAddr);

	if (isWriOrRead == false)
	{
		sscanf(argv[3], "%x", &regVal);
	}
	long baseAddr = regAddr&0xFFFFF000,offsetAddr= regAddr&0x00000FFF;
	printf("input data::0x%08x--0x%08x\n", regAddr, regVal);
    unsigned char *map_base=(unsigned char * )mmap(NULL, offsetAddr+1, PROT_READ | PROT_WRITE, MAP_SHARED, dev_fd, baseAddr);
	if (map_base == MAP_FAILED)
	{
		if (dev_fd)
			close(dev_fd);
		return -1;
	}
     
	if (isWriOrRead == false)
	{
		*(volatile unsigned int *)(map_base+ offsetAddr) = regVal;
	}
	printf("reg data::0x%08x--0x%08x\n", regAddr, *(volatile unsigned int *)(map_base + offsetAddr));

    if(dev_fd)
        close(dev_fd);

    munmap(map_base, offsetAddr+1);//解除映射关系

    return 0;
}