Date: Thu, 30 Oct 1997 21:38:21 +0000 From: coelho@compuland.com.br To: questions@freebsd.org Subject: Help to read parallel port Message-ID: <199710302337.VAA22350@sv.compuland.com.br>
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Hi:
I need to convert this c++ code, originally made for Linux. It
reads the parallel port. I want to set up a termometer, using a
inexpensive sensor. My problem is that <asm/io.h> and the function
ioperm, to open the lpt port...
Anyone has a tip ? What direction to do the same on a FreeBSD box ?
Thanks a lot!
Regards,
Helio.
#include <stdio.h>
#include <asm/io.h>
#define BASEPORT 0x3bc /* lp0 */
int main()
{
/* Get access to parallelport */
if (ioperm(BASEPORT,3,1)) {perror("ioperm");exit(1);}
long result, numsamples, i;
double temperature, offset, dutycycle;
numsamples=1000000; // one million samples
result=0;
for (i=0;i<numsamples;i++) //count number of high samples on pin 11
{
result=((0x40 & inb(BASEPORT+1)) >> 6)+result;
// bit-and with 0100000 (get level from pin 11 of statusreg.) //
and shift right 6 steps, then add the number to result.
}
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