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Re: [Discuss-gnuradio] Compile error


From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Compile error
Date: Mon, 10 Feb 2003 16:33:22 -0800
User-agent: Mutt/1.4i

On Mon, Feb 10, 2003 at 04:54:35PM -0500, Ravi Palaniappan wrote:
> Hello,
>  i connected the PCIDAS 4020 board and the RF-IF 4937 tuner.when i 
>  run
> 
> ./givelp1 ./fm_demod2 102.5 103.9
> 
> i get an error
> 

> could not load logo file '/dev/null'

The warning above is normal...

> Input Sampling Rate: 20000000
> Complex FIR decimation factor: 125
> QuadDemod Sampling Rate: 160000
> Real FIR decimation factor: 5
> Audio Sampling Rate: 32000
> can't set GrMC4020Source configuration (GIOCSETCONFIG): 
> Inappropriate ioctl for device
> 
> any ideas?
> 
> thanks,
> -Ravi

Hmmm,

Sounds like the device file doesn't match the assigned device number.

To rule out the obvious, do you have the mc4020 driver code built and
installed?  


Try this:

$ cat /proc/devices

$ ls -l /dev/mc4020*

On my system, they give these results:

address@hidden home]$ cat /proc/devices 
Character devices:
  1 mem
  2 pty/m%d
  3 pty/s%d
  4 tts/%d
  5 cua/%d
  6 lp
  7 vcs
 10 misc
 14 sound
 29 fb
109 lvm
116 alsa
127 mc4020              <<---  this is the one we care about
128 ptm
136 pts/%d
162 raw
180 usb
226 drm

Block devices:
  1 ramdisk
  2 fd
  3 ide0
  8 sd
  9 md
 11 sr
 22 ide1
 58 lvm
 65 sd
 66 sd

address@hidden home]$ ls -l /dev/mc4020*
cr--r--r--    1 root     root     127,   0 Feb 10 00:52 /dev/mc4020_0
cr--r--r--    1 root     root     127,   1 Feb 10 00:52 /dev/mc4020_1
cr--r--r--    1 root     root     127,  16 Feb 10 00:52 /dev/mc4020aux0
cr--r--r--    1 root     root     127,  17 Feb 10 00:52 /dev/mc4020aux1


Note that in each, the character major number is 127.

Do you get a stream of ascii integers when you try:

$ /usr/local/bin/mc4020-read-adc --ch3 --1v

As root, take a look at the tail of /var/log/messages for any messages
put out by the mc4020 driver.  When the module is first loaded, you
should get messages like this:

# tail -100 /var/log/messages

...
Feb 10 01:06:48 hanbo kernel: mc4020_init_module
Feb 10 01:06:48 hanbo kernel: mc4020: found board at ed000000, irq = 19
...


Eric




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