[rtl] Re: about comedi_trig_ioctl

[Ren Yuhong]

Hi, Markus and all,

Thank you all for your kind suggestion.  Since I am still not clear about the usage of "comedi_trig_ioctl", I tried to program my own analog input/output test program based on the NI PCI6035E card, which has been setup well in my machine. Attached please find the "my_test2.c" and my Makefile, I just tried to read from a DIO channel and write data into an AO channel.

Before "make", all related modules including rtl_*, comedi, and ni_pcimio have been inserted successfully. And I have added "-lcomedi" in the linking.

However, though I have included "comedilib.h",  the result of my "make" warned me that:
 in the line of "comedi_t   *cf"-----parse error before  '*', and 'cf' undeclared.

I checked this "comedilib.h", it includes "comedi.h".  I am puzzled with this problem, could you please point out where I was wrong?

BTW,  I wonder if there is a simple Comedi+RTLinux program which could be utilized to test my DAQ card running in RTL mode? Thanks a lot in advance.

Regards,

Yuhong
 
 
 
 
 
 
 
 

include /usr/src/linux/.config  

##### Compiler, Flags, Paths, etc. #####

RTL_CFLAGS  = -Wall -Wstrict-prototypes -O2 \
        -fomit-frame-pointer -fno-strength-reduce
RTL_CFLAGS += -I/usr/src/ComediLib/include
RTL_DEFS    = -D__RTL__ -D__KERNEL__ \
        -DMODULE -c

ifeq ($(CONFIG_MODVERSIONS),y)
RTL_DEFS += -DMODVERSIONS -include \
        /usr/src/rtlinux-2.3/linux/include/linux/modversions.h
endif

RTL_INCLUDE = -I . -I /usr/include/rtlinux \
         -I /usr/src/rtlinux-2.3/linux/include/asm-i386

LFLAGS = -L/usr/lib
LFLAGS += -L/usr/src/ComediLib/lib -lcomedi

GCC = gcc

##### File Names #####
RTL_SOURCE      =       my_test2.c

RTL_TARGET      =       my_test2.o

##### Build Rules #####

all: $(RTL_TARGET)

$(RTL_TARGET): $(RTL_SOURCE)
        $(GCC) $(RTL_INCLUDE) $(RTL_CFLAGS) $(RTL_DEFS) \
        -c $(RTL_SOURCE) -o $(RTL_TARGET)

clean:
        -rm -f *.o 

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/errno.h>

#include <rtl.h>
#include <rtl_fifo.h>
#include <rtl_sched.h>
#include <rtl_sync.h>
#include <rtl_debug.h>

//#include <comedi.h>           //main comedi header file
#include <comedilib.h>         // Includes "comedi.h" already

// Using NI PCI6035E, which has been setup well
int AI_device = 0; //AI subdevice
int AO_device =1 ; //AO subdevice
int DIO_device = 2; //DIO subdevice
int DIO_chan = 0;  //DIO channel
int AI_chan = 0;  //AI channel
int AO_chan = 0;  //AO channel
int range = 0;
int aref = 0;

int init_module(void);
void cleanup_module(void);

pthread_t thread;

void *start_routine(void *arg)
{
        int data,ret;
        struct sched_param p;
        p.sched_priority = 1;
        pthread_setschedparam(pthread_self(), SCHED_FIFO, &p);
        pthread_make_periodic_np(pthread_self(), gethrtime(), 500000000);

        comedi_t *cf;
        cf=comedi_open("/dev/comedi0");

        while (1) {
                     comedi_data_read(cf,DIO_device,DIO_chan,range,aref,&data);
                     ret=comedi_data_write(cf,AO_device,AO_chan,range,aref,10.0);
                     pthread_wait_np();                                                
                         
        }
        return 0;
}

int init_module(void) {
        
        return pthread_create(&thread, NULL, start_routine, 0);
}

void cleanup_module(void) {
        pthread_delete_np(thread);
}