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nbdwt73
PostPosted: Tue Jun 14, 2005 6:28 pm 
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Joined: Wed Jan 07, 2004 12:14 pm
Posts: 434
Location: Charlotte, NC
FINALLY!!!

Posted the solution to the WIKI (http://www.knoppmythwiki.org/index.php?page=LIRCHowTo). Let me know if you have a problem.
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khrusher
 Post subject:
PostPosted: Thu Jun 16, 2005 7:49 am 
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Joined: Tue Apr 13, 2004 6:51 pm
Posts: 890
Location: Groton, MA
hmmm, just read the post you referenced. I think I tried that before. The only piece that I haven't done since the move to A16 was use irrecord to create a lircd.conf file. I'm using the file i generated with R4V5 that worked perfectly. That can't be my issue, can it?

To summarize the R5A16 steps

1) apt-get remove lirc
2) assure linux sources are availible
3) install lirc-0.7.0
4) config, make, install
5) configure modules + lirc

Most of these steps are straight forward (you either type 'make' or you dont). maybe my module config/loading is amiss.

my related module files are (sorry for the length) :

/etc/modutils/lirc only has one line (the post says "on both lines")
Code:
alias char-major-61-0 lirc_serial


Code:
root@mythtv:/etc # cat modules
# /etc/modules: kernel modules to load at boot time.
#
# This file should contain the names of kernel modules that are
# to be loaded at boot time, one per line.  Comments begin with
# a `#', and everything on the line after them are ignored.
BusLogic
tmscsim
usbcore
uhci_hcd
ohci_hcd
usb_storage
ieee1394
rtc
ac
battery
button
container
fan
processor
thermal
video
pcmcia_core
rsrc_nonstatic
yenta_socket
pcmcia
ohci1394
serial_core
8250
parport
parport_pc
agpgart
intel_agp
hw_random
map_funcs
chipreg
mtdcore
i2c_core
i2c_i801
mii
e100
soundcore
snd
snd_page_alloc
snd_timer
snd_pcm
snd_ac97_codec
snd_intel8x0
snd_mixer_oss
af_packet
autofs4
ipv6
md5


Code:
root@mythtv:/etc # egrep "(lirc|serial)" modules.conf
### update-modules: start processing /etc/modutils/lirc
#This file is modified by lirc's maintainer scripts.
#               add options lirc_serial sense=0
alias char-major-61-0 lirc_serial
### update-modules: end processing /etc/modutils/lirc
### update-modules: start processing /etc/modutils/setserial
#post-install serial /etc/init.d/setserial start | logger -p daemon.info -t "setserial-module reload"
#pre-remove serial /etc/init.d/setserial stop | logger -p daemon.info -t "setserial-module uload"
alias /dev/tts          serial
alias /dev/tts/0        serial
alias /dev/tts/1        serial
alias /dev/tts/2        serial
alias /dev/tts/3        serial
post-install serial /etc/init.d/setserial modload > /dev/null 2> /dev/null
pre-remove serial /etc/init.d/setserial modsave  > /dev/null 2> /dev/null
### update-modules: end processing /etc/modutils/setserial


bottom of /etc/init.d/bootmisc.sh
Code:
setserial /dev/ttyS0 uart none
modprobe lirc_serial
/usr/local/sbin/lircd
/usr/local/sbin/lircmd


and finally

Code:
root@mythtv:/etc/init.d # /usr/local/sbin/lircd -v
lircd 0.7.0

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R5F1 - Dell P4 2.4Ghz 500MB - PVR250 x 2 - GeForce FX 5200 - Onboard sound/NIC 80GB ATA/250GB ATA/400GB SATA
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nbdwt73
 Post subject:
PostPosted: Thu Jun 16, 2005 10:12 am 
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Joined: Wed Jan 07, 2004 12:14 pm
Posts: 434
Location: Charlotte, NC
I am using the same lircd.conf and lircrc that I have had since before R4V5 (can't remember how old...) so I don't think that is your issue. The difference in process (admittedly I am not sure why yet) is that I did not alter modutils (or any other update to modules) nor did I alter ivtv (still says "alias char-major-61-0 lirc_i2c").

I did the same thing you did and coud not make it work. So I started over with a fresh build (have built 3 so far following the steps in the wiki exactly and have had no problems - don't alter modules or ivtv).

Also notice bootmisc.sh (lircmd is not there) - when I added it, it didn't work.
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khrusher
 Post subject:
PostPosted: Thu Jun 16, 2005 6:42 pm 
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Joined: Tue Apr 13, 2004 6:51 pm
Posts: 890
Location: Groton, MA
Well, I have my remote working, but it wasnt easy. I added a pile of printk statements to the code that was griping, lirc-0.7.1/drivers/lirc_serial/lirc_serial.c. printk statements output to the /var/log/kern.log file where I was seeing the error dump. By seeing which line of code preceeded the dump, I found the problematic statement. And by shit-luck the statement was buried in an #ifdef / #else block. So I forced the compiler to take the other path and joy, joy success.

Tech details:

Top of lirc_serial.c has
Code:
#if defined(rdtsc)

#define USE_RDTSC
#warning "Note: using rdtsc instruction"
#endif

further down
Code:
#ifdef USE_RDTSC
/* This is an overflow/precision juggle, complicated in that we can't
   do long long divide in the kernel */

/* When we use the rdtsc instruction to measure clocks, we keep the
 * pulse and space widths as clock cycles.  As this is CPU speed
 * dependent, the widths must be calculated in init_port and ioctl
 * time
 */

/* So send_pulse can quickly convert microseconds to clocks */
static unsigned long conv_us_to_clocks = 0;

static inline int init_timing_params(unsigned int new_duty_cycle,
                unsigned int new_freq)
{
        unsigned long long loops_per_sec,work;

        duty_cycle=new_duty_cycle;
        freq=new_freq;

        loops_per_sec=current_cpu_data.loops_per_jiffy;
        loops_per_sec*=HZ;

        /* How many clocks in a microsecond?, avoiding long long divide */
        work=loops_per_sec;
        work*=4295;  /* 4295 = 2^32 / 1e6 */
        conv_us_to_clocks=(work>>32);

        /* Carrier period in clocks, approach good up to 32GHz clock,
           gets carrier frequency within 8Hz */
        period=loops_per_sec>>3;
        period/=(freq>>3);

        /* Derive pulse and space from the period */

        pulse_width = period*duty_cycle/100;
        space_width = period - pulse_width;
        dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
                "clk/jiffy=%ld, pulse=%ld, space=%ld, "
                "conv_us_to_clocks=%ld\n",
                freq, duty_cycle, current_cpu_data.loops_per_jiffy,
                pulse_width, space_width, conv_us_to_clocks);
        return 0;
}
#else /* ! USE_RDTSC */
static inline int init_timing_params(unsigned int new_duty_cycle,
                unsigned int new_freq)
{
/* period, pulse/space width are kept with 8 binary places -
 * IE multiplied by 256. */
        if(256*1000000L/new_freq*new_duty_cycle/100<=
           LIRC_SERIAL_TRANSMITTER_LATENCY) return(-EINVAL);
        if(256*1000000L/new_freq*(100-new_duty_cycle)/100<=
           LIRC_SERIAL_TRANSMITTER_LATENCY) return(-EINVAL);
        duty_cycle=new_duty_cycle;
        freq=new_freq;
        period=256*1000000L/freq;
        pulse_width=period*duty_cycle/100;
        space_width=period-pulse_width;
        dprintk("in init_timing_params, freq=%d pulse=%ld, "
                "space=%ld\n", freq, pulse_width, space_width);
        return 0;
}
#endif /* USE_RDTSC */

Somehow rtdsc is defined so the first block is used. However, the line in the first block causes the modprobe failure.
Code:
loops_per_sec=current_cpu_data.loops_per_jiffy;

The first block should provide better timings if functional, but I prefer less-accurate timings that at least load.


STEPS TO FIX - This is a hack, that works for me, Im sure there are better ways.

To force the compiler to use the second block, I change

lirc-0.7.1/drivers/lirc_serial/lirc_serial.c line 109

from:
Code:
Old Code:
    #define USE_RDTSC

to:
Code:
New Code:
     #define DONT_USE_RDTSC


then
Code:
killall lircd
make
make install
rmmod lirc_serial
modprobe lirc_serial
lircd

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R5F1 - Dell P4 2.4Ghz 500MB - PVR250 x 2 - GeForce FX 5200 - Onboard sound/NIC 80GB ATA/250GB ATA/400GB SATA
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