[nmglug] parallel port address

[Bob Knight]

You probably don't want to hear this, but it compiles fine here after I 
get rid of the newlines inserted by the mail client...

Ubuntu Intrepid, gcc 4.3.2 ubuntuized.

Bob

akaluta wrote:
> Seasons Greetings All;
> The parallel port location found in /proc/ioports/ is 0378-037a
> parportO.
> The pertinent uncooperative program part: "#define base 0x0378"
>  /* printer port base address */
> a                                                                                    
>
> I have tried inputting various address permutations i.e 0x378 ,0378 ,
> 0378-037a I get varying error messages: cannot locate 378 ,alternately
> "invalid digit 8 in octal constant"
>
> program quoted:
> "/*
>  * Simple parallel port output control program for Linux
>  * Written and copyright by Tomi Engdahl 1998
>  * (e-mail: tomi.engdahl at hut.fi)
>  *
>  * The program output the data value to PC parallel port data pins
>  * (default lpt1 I/O address 0x378). The data values are given as the
>  * command line parameter to the program. The number can be
>  * in decimal (0..255) or hexadecimal format (0x00..0xFF).
>  *
>  */
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <sys/io.h>
>
> #define base 0x0378           /* printer port base address */
>
> main(int argc, char **argv)
> {                    
>   int value;
>
>   if (argc!=2)
>     fprintf(stderr, "Error: Wrong number of arguments. This program
> needs one argument which is number between 0 and 255.\n"), exit(1);
>   if (sscanf(argv[1],"%i",&value)!=1)
>     fprintf(stderr, "Error: Parameter is not a number.\n"), exit(1);
>   if ((value<0) || (value>255))
>     fprintf(stderr, "Error: Invalid numeric value. The parameter number
> must be between 0 and 255\n"), exit(1);
>   if (ioperm(base,1,1))
>     fprintf(stderr, "Error: Couldn't get the port at %x\n", base),
> exit(1);
>
>   outb((unsigned char)value, base);
> }" end quote.
>                                           
>
> Any insights,provided to the greenhorn,are appreciated. 
>                                              Best Regards,Anthony K
>
>
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