Hi,
I apologize for being mute so long. Seriously, I could not find enough
free minutes to switch my computer on; and in the rare cases I succeed, I
fell asleep before entering my password. And I did not notice your
mail during the sporadic uses of a precarious internet connection.
Let's hope things are getting better.
Cristian Axenie wrote:
> Hello all!
> I am trying to test the general purpose counter, GPCT, on the NI PCI 6024E
> DAQ board using the latest snapshot of Xenomai-Analogy branch. Reading
> through previous post I didn't find any post regarding the configuration and
> read operation for simple event counter. Following the PCI E series Register
> Level Programmer Manual and the DAQ-STC manual I've managed to implement a
> counter setup function and a counter read function. Both are based on
> instructions but I have a problem with the values beeing read from the save
> register in the counter structure. To make it clear I am attaching the
> implemented functions.
>
> The counter setup / initialization function :
>
> int counter_setup(void)
> {
> // return code
> int rc;
> // counter setup bits
> lsampl_t counter_setup;
> // number of read pulses on single event operation
> unsigned int pulses;
> // config data
> unsigned int data[10];
> // instruction instance
> a4l_insn_t insn;
>
> // ensure clock disarm
> insn.type = A4L_INSN_CONFIG;
> insn.idx_subd = ID_SUBDEV_COUNTER;
> insn.chan_desc = 0;
> insn.data_size = sizeof(data[0])*2;
> data[0] = A4L_INSN_CONFIG_DISARM;
> data[1] = NI_GPCT_ARM_IMMEDIATE;
> insn.data = data;
>
> if((rc = a4l_snd_insn(&desc, &insn))<0){
> fprintf(stderr,"counter setup: arm counter failed (rc=%d)\n",rc);
> }
>
> // reset counter
> insn.type = A4L_INSN_CONFIG;
> insn.idx_subd = ID_SUBDEV_COUNTER;
> insn.chan_desc = 0;
> insn.data_size = sizeof(data[0]);
> data[0] = A4L_INSN_CONFIG_RESET;
> insn.data = data;
>
> if((rc = a4l_snd_insn(&desc, &insn))<0){
> fprintf(stderr,"counter setup : reset counter failed (rc=%d)\n",rc);
> }
>
> // set counter mode bits
> counter_setup = NI_GPCT_COUNTING_MODE_NORMAL_BITS;
> counter_setup |= NI_GPCT_COUNTING_DIRECTION_UP_BITS;
> counter_setup |= NI_GPCT_NO_HARDWARE_DISARM_BITS;
> counter_setup |= NI_GPCT_EDGE_GATE_NO_STARTS_NO_STOPS_BITS;
> counter_setup |= NI_GPCT_DISABLED_GATE_SELECT;
>
> insn.type = A4L_INSN_CONFIG;
> insn.idx_subd = ID_SUBDEV_COUNTER;
> insn.chan_desc = 0;
> insn.data_size = sizeof(data[0])*2;
> data[0] = A4L_INSN_CONFIG_SET_COUNTER_MODE;
> data[1] = counter_setup;
> insn.data = data;
>
> if((rc = a4l_snd_insn(&desc, &insn))<0){
> fprintf(stderr,"counter setup: set counter mode failed (rc=%d)\n",rc);
> }
>
> // arm the counter
> insn.type = A4L_INSN_CONFIG;
> insn.idx_subd = ID_SUBDEV_COUNTER;
> insn.chan_desc = 0;
> insn.data_size = sizeof(data[0])*2;
> data[0] = A4L_INSN_CONFIG_ARM;
> data[1] = NI_GPCT_ARM_IMMEDIATE;
> insn.data = data;
>
> if((rc = a4l_snd_insn(&desc, &insn))<0){
> fprintf(stderr,"counter setup : arm counter failed (rc=%d)\n",rc);
> }
>
> // read insn setup
> insn.type = A4L_INSN_READ;
> insn.idx_subd = ID_SUBDEV_COUNTER;
> insn.chan_desc = 0;
> insn.data_size = sizeof(data);
> insn.data = &data;
>
> if((rc = a4l_snd_insn(&desc, &insn))<0){
> fprintf(stderr,"counter setup: read setup failed (rc=%d)\n",rc);
> }
> }
>
> And the counter read function :
>
> long counter_read(){
> // return code
> int rc;
> // single event pulses counter
> long pulses;
> // the read operation
> if((rc = a4l_sync_read(&desc,ID_SUBDEV_COUNTER, 0, 0,&pulses, 4))<0){
> fprintf(stderr,"counter reader : single event counting failed
> (rc=%d)\n",rc);
> }
> // return the number of pulses
> return ((long)pulses - COUNTER_OFFSET);
> }
>
> So my test program simply loops and reads the values from the counter. The
> problem is that I think I have some problems in the configuration bits
> because the values that are read from the counter aren't valid.
> A short preview :
Could you print the values in hexadecimal? With a bit of luck, that
might help to disclose a big / little endian issue. PCI devices are
little endian and if I remember well, you are using a PowerPC
micro-controller.
>
> val : -5419898
> val : -5418501
> val : -5417102
> val : -5415702
> val : -5414302
> val : -5412902
> val : -5411497
> val : -5410101
> .....
> val : 397603
> val : 398948
> val : 400293
> val : 401651
> val : 402998
> val : 404343
> val : 405687
> val : 407033
> ....
> val : -12501
> val : -11075
> val : -9650
> val : -8224
> val : -6795
> val : -4115
> val : -2297
> val : -869
> val : 552
> val : 1936
> val : 3311
> val : 4692
> val : 6061
> val : 7441
> val : 8819
>
> Furthermore some of the configuration values are mapping the legacy Comedi
> configuration bits.
> The test I'm running to simulate the simple event input is based on a 1Hz
> pulse train applied on CTRSRC0/PFI8 and another thing is that the counting
> never stops.
> Certainly it is a configuration problem or a flaw in the function design or
> am I missing something ? Any suggestions will be appreciated.
>
> Best,
> Cristian
> _______________________________________________
> Xenomai-help mailing list
> [email protected]
> https://mail.gna.org/listinfo/xenomai-help
--
Alexis.
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