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Handles range,maxdata information correctly. Internal triggering works.

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This commit is contained in:
David Schleef 2002-06-07 00:16:42 +00:00
parent 34327d3efd
commit f3ef54ca5c
1 changed files with 39 additions and 25 deletions
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64
demo/ao_waveform.c
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@ -56,7 +56,7 @@
/* frequency of the sine wave to output */
double waveform_frequency = 100.0;
double waveform_frequency = 10.0;
/* peak-to-peak amplitude, in DAC units (i.e., 0-4095) */
double amplitude = 4000;
@ -84,21 +84,40 @@ void dds_init_sine(void);
void dds_init_pseudocycloid(void);
void dds_init_sawtooth(void);
int comedi_internal_trigger(comedi_t *dev, unsigned int subd, unsigned int trignum)
{
comedi_insn insn;
lsampl_t data[1];
memset(&insn, 0, sizeof(comedi_insn));
insn.insn = INSN_INTTRIG;
insn.subdev = subd;
insn.data = data;
insn.n = 1;
data[0] = trignum;
return comedi_do_insn(dev, &insn);
}
int main(int argc, char *argv[])
{
comedi_cmd cmd;
comedi_insn insn;
int err;
int n,m;
int total=0;
comedi_t *dev;
unsigned int chanlist[16];
unsigned int maxdata;
comedi_range *rng;
int ret;
lsampl_t insn_data = 0;
parse_options(argc,argv);
/* Force n_chan to be 1 */
n_chan = 1;
n_chan = 2;
if(value){
waveform_frequency = value;
@ -111,6 +130,12 @@ int main(int argc, char *argv[])
}
subdevice = comedi_find_subdevice_by_type(dev,COMEDI_SUBD_AO,0);
maxdata = comedi_get_maxdata(dev,subdevice,0);
rng = comedi_get_range(dev,subdevice,0,0);
offset = (double)comedi_from_phys(0.0,rng,maxdata);
amplitude = (double)comedi_from_phys(1.0,rng,maxdata) - offset;
memset(&cmd,0,sizeof(cmd));
cmd.subdev = subdevice;
cmd.flags = 0;
@ -136,26 +161,24 @@ int main(int argc, char *argv[])
dds_output(data,BUF_LEN);
dds_output(data,BUF_LEN);
dump_cmd(stdout,&cmd);
if ((err = comedi_command(dev, &cmd)) < 0) {
comedi_perror("comedi_command");
exit(1);
}
m=write(comedi_fileno(dev),data,BUF_LEN*sizeof(sampl_t));
perror("write");
if(m<0){
perror("write");
exit(1);
}
printf("m=%d\n",m);
memset(&insn, 0, sizeof(comedi_insn));
insn.insn = INSN_INTTRIG;
insn.subdev = subdevice;
insn.n = 1;
insn.data = &insn_data;
insn.data[ 0 ] = 0;
err = comedi_do_insn(dev, &insn);
if( err < 0 )
{
perror("comedi_do_insn()");
abort();
ret = comedi_internal_trigger(dev, subdevice, 0);
if(ret<0){
perror("comedi_internal_trigger\n");
exit(1);
}
while(1){
@ -167,7 +190,7 @@ int main(int argc, char *argv[])
perror("write");
exit(0);
}
//printf("m=%d\n",m);
printf("m=%d\n",m);
n-=m;
}
total+=BUF_LEN;
@ -191,18 +214,9 @@ unsigned int adder;
void dds_init(void)
{
int i;
adder=waveform_frequency/freq*(1<<16)*(1<<WAVEFORM_SHIFT);
dds_init_function();
/* this is due to a bug in the NI-E driver */
if(range){
for(i=0;i<WAVEFORM_LEN;i++){
waveform[i]^=0x800;
}
}
}
void dds_output(sampl_t *buf,int n)