Re: [ts-7000] Re: TS-XDIO sample code.

["Don W. Carr" <>]

Well, I could see the attachment on my end, maybe because I sent it. I suppose they might strip the the attachments off at yahoo. Anyway, here is the code pasted directly as text. Don.

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


/******************************************************************/

static unsigned char *xdio_start;
static unsigned char *xdio_r0;
static unsigned char *xdio_r1;
static unsigned char *xdio_r2;
static unsigned char *xdio_r3;
static unsigned short *ptr16;

#define TV_ELAPSED_US(x, y)     ((((x).tv_sec - (y).tv_sec) * 1000000) + \
        ((x).tv_usec - (y).tv_usec))

/*********************************************************************/

long calc_dif(long count, long last)
{
  if (last > count)
  {
    // Ok, we rolled over
    return count + 65536 - last;
  }
  else
  {
    return count - last;
  }
}

/*********************************************************************/

int main(int argc, char *argv[])
{
  int fd = open("/dev/mem", O_RDWR|O_SYNC);
  //xdio at 0x12c00000-0x12c00003
  xdio_start = (unsigned char *) mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x12C00000);
  xdio_r0 = (unsigned char *) (xdio_start + 0);
  xdio_r1 = (unsigned char *) (xdio_start + 1);
  xdio_r2 = (unsigned char *) (xdio_start + 2);
  xdio_r3 = (unsigned char *) (xdio_start + 3);

  ptr16 = (unsigned short *) xdio_r2;

  *xdio_r0 = 0x40; // ?? give me the value to write here
  *xdio_r1 = 0x00; // ?? give me the value to write here
/***
  *xdio_r0 = 0x82;
  *xdio_r1 = 0x00;
   for discrete outputs
  *xdio_r0 = 0x00;
  *xdio_r1 = 0xFF;
****/

  printf("Wrote, r0 = 0x43, r1 = 0x00\n");

  struct timeval now;
  struct timeval last_time;
  gettimeofday(&last_time, NULL);
  unsigned short last_count = *ptr16;
  while (1)
  {
    sleep(1);
    gettimeofday(&now, NULL);
    unsigned short count16 = *ptr16;
    int elapsed_time = TV_ELAPSED_US(now, last_time);
    long n_pulses = calc_dif((long) count16, (long) last_count);
    double frequency = ((double) n_pulses) / (((double) elapsed_time) / 1000000);
    unsigned char byte0 = *xdio_r2;
    unsigned char byte1 = *xdio_r3;
    printf("--- %02hhx %02hhx %02hhx %02hhx -  %hx %hu  %d %d %0.0lf\n",
         xdio_r0, *xdio_r1, byte0, byte1, count16, count16, n_pulses, elapsed_time, frequency);

    last_count = count16;
    last_time = now;
  }
}

/******************************************************************/

On 4/17/06, rx7vt <> wrote:

--- In "Don W. Carr" <> wrote:
>

> I wrote some code, and it appears to work, but with glitches, such
that some
> times, the new count I read is actually less than the previous
count, and,
> it appears to not count all pulses. I had an external source set to
EXACTLY
> 100 Hz, and expected to get 200 Hz since the xdio counter counts both
> falling and rising edges, but got consistantly lower.

Looks like attachments don't work. Could you upload the file to the
'files' section? (Or, if I'm missing something about how to see the
code that you sent, please enlighten me....)

Thanks...

SPONSORED LINKS

Linux os	Hardware	Arms
Computer internet	Computer security	Computer hardware security

---

YAHOO! GROUPS LINKS

•  Visit your group "ts-7000" on the web.
   
•  To unsubscribe from this group, send an email to:
   =Unsubscribe
   
•  Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

---

--
Dr. Don W. Carr
J. G. Montenegro 2258
Guadalajara, Mexico
+52-333-630-0704
+52-333-836-4500 ext 2930

---

YAHOO! GROUPS LINKS

•  Visit your group "ts-7000" on the web.
   
•  To unsubscribe from this group, send an email to:
   =Unsubscribe
   
•  Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

---