On 15 April 2015 at 01:32, Joe H <[email protected]> wrote:
> "dmesg" does show
> information, but no pin out.I could use a pointer in the correct
> direction.  I've been reading the manual but I am stuck.

dmesg is a way to view the log of kernel messages. When LinuxCNC
starts up with a Mesa card it prints the information to the kernel
log, but after a reboot or other information the data will tend to
scroll off the top.

If you start the PC then "sudo dmesg -c" then the kernel log will be
cleared. Then you can start LinuxCNC and "dmesg" again to see the
pinout in the terminal.
You can either copy and paste the information from the terminal window
to a text editor, or use dmesg > hm2.txt to send the log to a text
file then open that.

You can also get this information without starting (all of) LinuxCNC.
(And this can be a good way to find out what the pinout of a specific
firmware is).
Assuming for this example that you are interested in the SVST8_4.BIT
firmware file open a terminal and..

halrun
loadrt hostmot2
loadrt hm2_pci config="firmware=hm2/5i20/SVST8_4.BIT"
show pin
show param
exit
dmesg

That will give you a list of all the HAL pins, all the parameters and
then the pinout for that firmware. Because no modifiers are used then
all functions will be enabled and there may well be no pins "free" for
GPIO. You typically make pins available for GPIO by disabling other
functions.

Another way to find the pinout of a specific firmware is to to look here:
http://git.linuxcnc.org/gitweb?p=hostmot2-firmware.git;a=tree

For example the default pinout for SVST8_4 can be seen in the
PIN_SVST8_4_72.VHD file. (72 means "pinout for 72 pin cards" such as
5i20, 5i23 etc)


-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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