gpiotest.c

基于linux和s3c2440的gpio驱动程序

//written by bcng xiyong,2007-7-1
//set gpj4 to zero to give a kill signal to chip ltc2950

//a guidline about how to use gpio_driver
//p[0] is the address of the iocon of the io
//p[1] is the bit place, from 0 to xx,
//for example, GPJ4, p[1] is 0x4;

//for write function, the 3th parameter, if the second bit is set,  them use keep before   

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

#define GPJCON 0x560000d0
#define GPJ2 0x2

#define GPGCON 0x56000060
#define GPG4 0x4
int main(int argc,char *argv[] )
{
   int fd,FunctionIndex;
   unsigned long conreg,pin;
   unsigned long  p[2];
   fd=open("/dev/gpio",O_RDWR | O_NOCTTY);
   if (fd < 0)
        {
                printf("can not open led!\n");
		return -1;
        }
  
  p[0]=GPGCON;  //GPJCON
  p[1]=GPG4;
  
  if (argc==3)
  {
                sscanf(argv[1], "%x", &conreg);
                sscanf(argv[2], "%x", &pin);
                p[0]=conreg;  //GPJCON
  		p[1]=pin;
  		printf("con is %x,pin is %x\n",p[0],p[1]);
        
  }
  else
  {
  	printf("inpt error\n");
  	return -1;
  }

  

   
  printf("+----------------------------------------+\n");
  printf("|      ARM  Linux  GPIO driver test                  |\n");
  printf("|      Write on 2007.7.1   xiyong bcng GPG4        |\n");
  printf("+----------------------------------------+\n");
  printf("\n");

  printf("\n Please select the function to test ( Main Menu):");
  printf("\n  1: write 1 ");
  printf("\n  2: write 0 ");
  printf("\n  3: set pin to function10 ");
  printf("\n  4: set pin to function11 ");
  printf("\n  5: set pin to input ");
  printf("\n  6: set pullup ");
  printf("\n  7: disable pullup ");
  printf("\n  8: display register value ");
  
  printf("\n  0: exit ");
  
  for(;;)
  {
   scanf("%d",&FunctionIndex);
   switch(FunctionIndex)
   {
   case 1: 
      
      printf("write 1\n");
      write(fd,p,1);
      
      break;
   
   case 2: 
      
      printf("write 0\n");
      write(fd,p,0);
      
      break;
      
   case 3:
      printf("set pin to function10 \n");
      write(fd,p,2);
      break;
   
   case 4:
      printf("set pin to function11 \n");
      write(fd,p,4);
      break;
   
   case 5:
      printf("set pin to input \n");
      read(fd,p,0);
      break;
   
   case 6:
      printf("set pullup\n");
      read(fd,p,3);
      break;
   
   case 7:
      printf("disable pullup\n");
      read(fd,p,2);
      break;
      
   case 8:
      printf("display register value\n");
      read(fd,p,8);
      break;
      
   case 0:
      close(fd);
      exit(1);
   default: 
      close(fd);
      exit(1); 
  }
  
} 
   
}