Hi Hans!
Am Mittwoch, 8. Mai 2019 18:54:37 UTC+2 schrieb Hans Leeuw:
>
> I set it at the maximum size for the moment although it can be a little
> smaller indeed.... I forgot to make it smaller in my example. I think it is
> not important for the resolution issue though.
>
When the size of the ERam is too small the main loop doesn't start -> no
ADC sampling at all. You'll get garbage.
> Starting the outer loop at 0 wil only lead to printing the step cycle one
> compleet cycle earlier (from the start) but does not change the resolution
> either.
>
Correct!
Where do I fail to catch an error message?
>
A lot of errors are uncatched. This version catches them all
#include "stdio.h"
#include "libpruio/pruio.h" // include header
#include <unistd.h>
int main(int argc, char **argv)
{
int i = 1, n;
char *emsg = "CTOR";
pruIo *io = pruio_new(PRUIO_DEF_ACTIVE, 4, 0x98, 0);
while (!io->Errr) {
if (pruio_adc_setStep(io, 7, 0, 1, 0, 0)) {emsg = "step 7"; i = 2;
break;} //Step 7, AIN-0
if (pruio_adc_setStep(io, 8, 1, 1, 0, 0)) {emsg = "step 8"; i = 2;
break;} //Step 8, AIN-1
if (pruio_adc_setStep(io, 9, 2, 1, 0, 0)) {emsg = "step 9"; i = 2;
break;} //Step 9, AIN-2
if (pruio_adc_setStep(io, 10, 3, 1, 0, 0)) {emsg = "step 10"; i = 2;
break;} //Step 10, AIN-3
if (pruio_adc_setStep(io, 11, 4, 1, 0, 0)) {emsg = "step 11"; i = 2;
break;} //Step 11, AIN-4
if (pruio_adc_setStep(io, 12, 5, 1, 0, 0)) {emsg = "step 12"; i = 2;
break;} //Step 12, AIN-5
if (pruio_adc_setStep(io, 13, 6, 1, 0, 0)) {emsg = "step 13"; i = 2;
break;} //Step 13, AIN-6
if (pruio_adc_setStep(io, 14, 7, 1, 0, 0)) {emsg = "step 14"; i = 2;
break;} //Step 14, AIN-7
// upload settings, prepare MM mode
if (pruio_config(io, 220500, 255<<7, 45352, 0)) {emsg = "config"; i =
3; break;}
// start measurement //Starts in rb_mode
if (pruio_rb_start(io)) {emsg = "rb_start"; i =
4; break;}
printf("initialized\n");
usleep(10000);
/* now current ADC samples are available for AIN-0 to AIN-7 in array
io->Adc->Value[] */
for(n = 0; n <= 13; n++) { // print some lines
for(i = 0; i < 8; i++) // all steps
printf(" %4X", io->Adc->Value[i + (8 * n)]); // output one channel
in hex
printf("\n"); // next line
}
i = 0;
}
/* we're done */
if (io->Errr) printf("%s failed (%s)\n", emsg, io->Errr);
pruio_destroy(io); /* destroy driver structure */
return i;
}
Try it. You also can check the available ERam size by printing out io->ESize
.
> The documentation also mentions a status bit that is used to indicate that
> the ADC is busy converting (page 1828). Is the status bit information used
> in the rb-mode?
>
Yes, the status bit gets checked for restart as well as the FiFo counter
before fetching a sample.
Regards
--
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