[nmglug] parallel port address
akaluta
akaluta at taosnet.com
Sat Dec 27 20:17:31 PST 2008
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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