developing drivers for custom boards

Yup, another thing came to mind. In the comp file I have:

function read
function write

In that order. Does that mean the read will be first then the write or is that controlled by the HAL file?

Thanks Andy, on futher thought I think it makes sense to do an address read for the first data byte to be sent to PC, just like the address write for the first byte sent to the card.

This way I can not worry about having the threads in the wrong order.

Now PCW may have already suggested I do it this way, But I took his advice to mean a single address write then clock all the data both ways. So PCW, if you did mean that, it only took me a week to come around and see it - LOL

Finally found time to get back to this, I followed the instructions given by andy to install my comp file:

sudo comp --install/somewhere/eppdriver.comp

here are the errors:

ruby@ruby-desktop:~$ sudo comp --install /home/ruby/emc2/configs/eppdriver.comp
[sudo] password for ruby:
Traceback (most recent call last):
File "/usr/bin/comp", line 1321, in <module>
main()
File "/usr/bin/comp", line 1290, in main
process(f, mode, outfile)
File "/usr/bin/comp", line 1164, in process
a, b = parse(filename)
File "/usr/bin/comp", line 404, in parse
a, b = f.split("\n;;\n", 1)
ValueError: need more than 1 value to unpack
ruby@ruby-desktop:~$

now not really knowing if thesew are errors, warnings, or flat out failures, I tried to load it in my hal file:


loadrt eppdriver ioaddr=0x378

won't load, message after all the intresting stuff is:

can't find module 'eppdriver' in usr/realtime......


I looked and in fact it is not there. So I can only assume there was a real problem with the comp --install? The comp file is the one I posted here with only the base_address +3 changes

BTW, happy to post more error messages if needed when I get back to work tomorrow. I was rushing when I posted and my Emc machine does not have Internet access so everything is copy paste transfer post.

Just found and read this thread:
www.linuxcnc.org/component/option,com_ku...tart,0/lang,english/

I am not clear to how the OP resolved the same exact error I have, But I am going to make sure the file is "clean" Update in just a bit.

Next update: Checked all spelling and such. Even re-typed the driver just to be sure there are no crazy codes, did this in Gedit. Still same error.