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e12digitalGP.c

/*
e12digitalGP.c
reads/writes/configures the coprocessors general purpose port zero
7/24/03
Nathan Z. Gustavson ngustavson@emacinc.com
Emac.inc
www.emacinc.com
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/types.h>
#include <asm/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <sched.h>
#include <sys/resource.h>
#include <sys/io.h>
#include <E12user.h>
#include <packet.h>
#include <coprocessor.h>

#define DIGRESPONSE BITMASK(PRTIN0)

#define ARGCHECK(num){if(argc<=num){printf("invalid number of arguements\n");help();return -1;}}


#define OPENDEV(filed,dev){if((filed = open(dev, O_RDWR))<=0){printf("couldn't open %s\n",dev);return -1;}}


static int help(void)
{
const char *help_table = "**********************************************
*e12digitalGP                                *
*Nathan Z. Gustavson                         *
*Emac.inc                                    * 
*"__DATE__"                                 *
*usage:                                      *   
*e12digitalGP device port command (data/mask)*
*commands                                    *
*                                            *
*I/O mask  - i mask is input/output bitmask  *
*1 = output 0 = input                        *
*                                            *
*read      - r (mask/data) unused            *
*returns current state of the pins           * 
*                                            *
*write     - w data                          *
*drive output pins with data                 *
**********************************************\n";
printf("%s",help_table);
return 0;
}




int main(int argc,char **argv)
{
int fd,rxnum;
__u8 mask;
Cop_Data *Cop = CopDeviceCreate(0);
__u32 typemask=0;
__u8 buffer[100];
int port;

ARGCHECK(3);

OPENDEV(fd,argv[1]);

port = strtoul(argv[2],NULL,0);

if((port>1)||(port<0))
    {
      printf("invalid port %u\n",port);
      help();
      return 0;
    }

switch(*argv[3])//switch command
  {
  case 'i':
    ARGCHECK(4);    
    mask = strtoul(argv[4],NULL,0);
    E12_Digital_Cfg(fd, mask,port);
    break;

  case 'r':
  ARGCHECK(3); 
  E12_Digital_Req(fd);
  while(!(typemask&DIGRESPONSE))
    {//disregard any other data
      rxnum =read(fd,buffer,sizeof(buffer));
      typemask = E12_Packet_Route(Cop,buffer, rxnum);
    }
  printf("%x\n",Cop->Digital[port]);
  break;

  case 'w':
    ARGCHECK(4);
    mask = (unsigned char)strtoul(argv[4],NULL,0);
    E12_Digitalout(fd,mask,port);
    break;

  default:
    printf("invalid command\n");
    help();
  }

return 0;

}

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