Don,
Did you ever get your 7260 TS-XDIO on DIO2 header to work
as outputs ? I saw your snip that was commented out.
/***
...
for discrete outputs
*xdio_r0 = 0x00;
*xdio_r1 = 0xFF;
****/
and was curious if you got this to work. I tried it and
only see 3.3V on ALL the outputs.
"This is coming from a SW engineer with a ChE background",
so I might be leading down a wrong path, but
concerning a very simplistic Breadboard setup: I have a BB
with one side 5V TLL and the other side at 3.3V. I use
two 74HC05 Hex inverters, they take 2-7V. I have one on
each side, VCC at 3.3V and the other at 5.0V (separate supply).
(the one at the SBC running at 3.3V VCC, actually off DIO2 pin 16.
I tie the GNDs together and use the output of the 3.3V 74HC05
to the input of the one running at 5.0V and then use that
output for any 5V TTL signals (inverted twice). You could
configure the setup to go in the other direction as well I think.
Testing the circuit before connecting the DIO signals worked
fine. The 74HC05 (at VCC 5.0V tiggers just fine with 3.3 logic
high).
I just wish I could get the 7260 TS-XDIO lines to toggle.
Let me know if you got your code to run as outputs. I found
it strange that the direction logic changed between simple
DIO and TS-XDIO setups. (or the documentation had a typo).
The opto-isolators are best for production deployment. They
also make a bus transeiver made for these applications where
you set the direction but I could only find a SMT.
Best Regards,
Rich
--- In "Don W. Carr" <> wrote:
>
> 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" <doncarr@> 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
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>
>
>
> --
> Dr. Don W. Carr
> J. G. Montenegro 2258
> Guadalajara, Mexico
> +52-333-630-0704
> +52-333-836-4500 ext 2930
>
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