I wrote the module for kernel 2.4.
if i understand this error messages correctly, just comment out the lines
INC_MOD_USE_COUNT ;
and
DEC_MOD_USE_COUNT;
hopefully it will work now.
greets,ernst
2007/2/11, Giovanni <[EMAIL PROTECTED]>:
>
> I tried to compile the servo.c program with the makefile indicated in
> the email, but I get a compilation error.
>
> Here is the Makefile:
>
> AXIS_TOP_DIR=/home/giovanni/fox/sdk/sdk-2.01-phrozen-new/devboard-R2_01
>
> TARGET := servo
> WARN := -W -Wstrict-prototypes -Wmissing-prototypes
> INCLUDE := -isystem /home/giovanni/fox/sdk/sdk-2.01-phrozen-new
> /devboard-R2_01/os/linux-2.6/include
> CFLAGS := -O2 -DMODULE -D__KERNEL__ ${WARN} ${INCLUDE} -mlinux -DCRISMMU
> CC := gcc-cris
>
> PREVENT_RECURSIVE_INCLUDE = 1
>
> PATH=$PATH:/usr/local/cris
>
> ${TARGET}.o: ${TARGET}.c
>
> .PHONY: clean
>
> clean:
> rm -rf {TARGET}.o
>
> Here is the error:
>
> [EMAIL PROTECTED]:~/fox/sdk/sdk-2.01-phrozen-new/devboard-R2_01/apps/servo$
> make
> gcc-cris -O2 -DMODULE -D__KERNEL__ -W -Wstrict-prototypes
> -Wmissing-prototypes -isystem /home/giovanni/fox/sdk/sdk-2.01-phrozen-new
> /devboard-R2_01/os/linux-2.6/include -mlinux -DCRISMMU -c -o servo.o
> servo.c
> servo.c:29: warning: static declaration for `init_module' follows
> non-static
> servo.c:30: warning: static declaration for `cleanup_module' follows
> non-static
> servo.c: In function `device_open':
> servo.c:138: `MOD_INC_USE_COUNT' undeclared (first use in this function)
> servo.c:138: (Each undeclared identifier is reported only once
> servo.c:138: for each function it appears in.)
> servo.c: In function `device_release':
> servo.c:158: `MOD_DEC_USE_COUNT' undeclared (first use in this function)
> make: *** [servo.o] Error 1
>
> How can I do to make this file compile correctly ?
>
> Best regards,
> Giovanni
>
> Ernst Mayerhofer <[EMAIL PROTECTED]<ernst.mayerhofer%40gmail.com>>
> wrote: if you want to make something which works really well, you have to do
> it in
>
> the kernel ;-)
>
> I made a kernel module once. As I modified it now for you and didn't test
> it
> on the foxboard, there might be a problem, so feel free to ask me if there
> is some problem.
>
> just compile the servo.c attached with the also attached makefile. you
> have
> to change the path of AXIS_TOP_DIR in the Makefile.
>
> once you have compiled it, transfer it to the foxboard and type:
> $ insmod servo.o
> if you want to see the kernel log messages, type
> $ dmesg
> then you can make a new device node , eg
> $ mknod c /etc/servo c 249 0
> and, if you want to set the servo to a specific position, write the value
> of
> T_on in us to /etc/servo:
> $ echo 500 > /etc/servo
>
> it should work!
> notice that if you want to use it, you have to enable the fast timer api.
>
> greets and pardon for my bad english,
>
> ernst mayerhofer
>
> 2007/2/2, Giovanni <[EMAIL PROTECTED] <pino_otto%40yahoo.com>>:
> >
> > This solution sounds cool.
> >
> > Did you try it with a real case ?
> >
> > I would like to run some real working code based on this idea. If you
> have
> > some code ready to run, can you post it ? Otherwise we can collaborate
> to
> > develop some working code and test it.
> >
> > Best regards,
> > Giovanni
> >
> > spargelzack <[EMAIL PROTECTED] <spargelzack%40yahoo.com><spargelzack%
> 40yahoo.com>> wrote:
> > (sorry if this shows up twice, i'm not familiar with the yahoo groups
> >
> > interface yet)
> >
> > Hi Everybody
> >
> > I found a cheap + fast solution for using servos with the foxboard.
> >
> > First, there is a way to use the i/o lines not described on the
> > acmesystems website (it's well known on the axis developer website
> > though). You can use write() on Ports A+B after proper initialization.
> >
> > The Clock interval is around 5 us, so you have to pass about 4000
> > values for a full 2ms period.
> >
> > But as i found out, the 20ms interval isn't all that important. What
> > matters is the length of the pulse.
> >
> > So, here's my code:
> >
> > --
> > #include <stdio.h>
> > #include "stdlib.h"
> > #include "unistd.h"
> > #include "sys/ioctl.h"
> > #include "fcntl.h"
> > #include <sys/time.h>
> > #include <asm/etraxgpio.h>
> >
> > int main(int argc, char **argv){
> > int fd;
> > int i;
> > int pos;
> > unsigned char mask;
> > unsigned char period[4000];
> >
> > if(argc > 1)
> > pos = atoi(argv[1]);
> > else
> > pos = 100;
> >
> > // better use memset() here, but this is proof-of-concept code
> > for(i=0; i<pos+1; i++){
> > if(pos > i)
> > period[i] = 0xFF;
> > else
> > period[i] = 0;
> > }
> >
> > fd = open("/dev/gpiob", O_RDWR);
> >
> > if(!fd){
> > printf("open error\n");
> > exit(-1);
> > }
> >
> > mask = 1<<6 | 1<<7; // use pins PB6 and PB7 according to the
> > fox pinout
> >
> > // prepare for write()
> > if(ioctl(fd, _IO(ETRAXGPIO_IOCTYPE, IO_CFG_WRITE_MODE),
> > IO_CFG_WRITE_MODE_VALUE(1, mask, 1<<1))){
> > perror("ioctl error");
> > exit(-1);
> > }
> >
> > for(;;){
> > write(fd, &period, pos+1); // write the pulse,
> > followed by a zero to set the output
> > usleep(5000); // let the CPU breathe a bit..
> > }
> > }
> > --
> >
> > This only works with ports A and B, not with the G line.
> >
> > Supply any value between 100 and 400 as first argument to set the
> > position of two servos connected to PB6 and PB7.
> >
> > example:
> >
> > ./motor 180
> >
> > This uses LESS THAN 1% CPU when running.
> >
> > This is proof of concept code, so it's UGLY AND NOT USEFUL OUT OF THE
> > BOX. Also, my english sucks a bit.
> >
> > --- In [email protected]
> > <foxboard%40yahoogroups.com><foxboard%40yahoogr
> oups.com>, "zooltheno1"
> > <[EMAIL PROTECTED]> wrote:
> > >
> > > Hi
> > > I want to use RC-Servos with the Foxboard, the normal interfall is
> > > 1-2ms and 20ms pause.
> > > I tried to use udelay for the delay, put the minimum is 40ms,
> > > which is far to slow, even normal AC is faster.
> > > How could I get the nesasery delay without 100% CPU load ?
> > >
> > > Bye
> > > Ralph
> > >
> >
> >
> >
> >
> >
> > ------------------------------------------------
> > Resources are limited, Imagination is unlimited.
> >
> > ---------------------------------
> > Want to start your own business? Learn how on Yahoo! Small Business.
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
> ------------------------------------------------
> Resources are limited, Imagination is unlimited.
>
> ---------------------------------
> Get your own web address.
> Have a HUGE year through Yahoo! Small Business.
>
> [Non-text portions of this message have been removed]
>
>
>
[Non-text portions of this message have been removed]
