Output Asynchronous

Hi to all

I´m trying to execute a program output 4096 samles ( numbering from 0 to 4095).

the info demo provide the next information:

overall info:

version code: 0x00073b

driver name: ni_pcimio

board name: pci-6024e

number of subdevices: 7

.

.

subdevice 1:

type: 2 (analog output)

number of channels: 2

max data value: 4095

ranges:

all chans: [-10,10] [0,10] [-1,1] [0,1]

command:

start: now

scan_begin: timer

convert: now

scan_end: count

stop: none|count

command fast 1chan:

can't do timed?!?

not supported

Well, when i try to execute my program, the sencond comand_comedi_test return 0. However, th comedi_command() function return to me -1 and the comedi_perror give me the following error:

Comedi_command: Conseguido

The Spanish word "conseguido" means in English "achieve".

I think the error is printable in Spanish because is a System Operative error, DO you think?

I would be lovely if somebody could help me because i´m driving crazy for this problem.

Any more cuestion: Does it output the 4096 samples in one scan or no? i very confused and I like somebody explain to me how the samples are output and how works the streaming buffer the comedi.

Here you are my code:

#include <comedilib.h>

#include <comedi.h>

#include <linux/kernel.h>

 

int main(int argc, char *argv[])

{

comedi_t *device;

comedi_cmd cmd;

sampl_t data[4096]; 

int subdevice; /* Dispositivo de Salida Analogica */

unsigned int chanlist[1]; 

int ret=1;

int err;

int i;

int m;

subdevice=1;

for(i=0;i<4096;i++)

data[i]=i;

device=comedi_open("/dev/comedi0");

if (device<0)

{

comedi_perror("/dev/comedi0");

exit(1);

} 

// subdevice=comedi_find_subdevice_by_type(device,COMEDI_SUBD_AO,0);

/* Inicializamos la estructura comedi_cmd */

memset (&cmd,0,sizeof(cmd));



/* Configuramos la estructura comedi_cmd */



cmd.subdev=subdevice;

cmd.flags=TRIG_WAKE_EOS;

cmd.start_src=TRIG_NOW; /* La escritura de datos comienza de inmediato*/

cmd.start_arg=0;

cmd.scan_begin_src=TRIG_TIMER; /* Se escribe el conjunto de muestras (scan) a la velocidad indicada en el argumento */

cmd.scan_begin_arg=1000000; /* 100 nanosegundos */

/* Velocidad a la que realizamos cada muestra */

cmd.convert_src=TRIG_NOW;

cmd.convert_arg=0; /* Lo mas rapido posible */

cmd.scan_end_src=TRIG_COUNT;

cmd.scan_end_arg=1;

/* Escribiremos solo un conjunto de muestras (1 scaneo) */

cmd.stop_src=TRIG_NONE;

cmd.stop_arg=0;

chanlist[0]=CR_PACK(0,0,AREF_GROUND);

cmd.chanlist=chanlist;

cmd.chanlist_len=1;

while(ret!=0)

{

ret=comedi_command_test(device,&cmd);

if (ret<0)

{

comedi_perror("comedi_command_test");

exit(1);

}

} 

//lseek (comedi_fileno(device),subdevice,SEEK_SET);



write (comedi_fileno(device),data,sizeof(sampl_t)*4096); 

err=comedi_command(device,&cmd);

if (err<0)

{

comedi_perror("comedi_command");

}

while(1) 

write(comedi_fileno(device),data,sizeof(sampl_t)*4096);



}



 

 Thank you very much for you greatful help and sorry for my bad English (i hope it will be better soon)

Universidad Politecnica de Madrid (EUITT)

 


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