I used "sudo apt-get install" and libmodbus5 was already there.
halcompile --install x200_vfd.comp does:
gcc -I/usr/include -I/usr/include/linuxcnc -URTAPI -U__MODULE__ -DULPAI
-Os -o x200_vfd /tmp/tmp4bdQIY/x200_vfd.c -Wl,-rpath,/lib -L/lib
-llinxcnchal
Then, no error about missing typedef (and function prototypes)- which
would have been a lack of a header file. It's got the header file, now
"undefined reference" for the functions. So the header prototyped the
function now, but it's not seeing the actual compiled code
"modbus_write_registers" etc
Danny
On 4/8/2022 12:25 PM, gene heskett wrote:
On Friday, 8 April 2022 13:06:57 EDT Danny Miller wrote:
So, I think libmodbus-dev is correct, the typedef and function names
match.
I installed it, now the file in /usr/include/modbus/modbus.h should
work, and it looks like halcompile definitely uses it when given an
explicit path, since the error message changes.
That directory just has the header file, it looks like the error is
that it can't actually find the compiled definitions of the functions
called out in the header.
Danny
That sounds like you do not have libmodbus5 installed. And that puzzles
me a bit because libmodbus-dev should have pulled it in as a dependency.
What utility are you useing to install this stuff?
On 4/7/2022 9:01 PM, Danny Miller wrote:
Thanks Andy! Closer... it's in /usr/include/modbus/
I specified that. Now it doesn't fail on a missing type modbus_t,
but
rather "undefined reference" to any modbus_write_bit etc functions.
So even though I did get that install for libmodbus to work, it just
has the header file. It's not able to find the definitions in a
compiled file.
More ideas?
Danny
On 4/7/2022 5:23 AM, andy pugh wrote:
On Thu, 7 Apr 2022 at 03:27, Danny Miller <dan...@austin.rr.com>
wrote:
And same prob. It's looking for stuff in the libmodbus's modbus.h
but
it's not seeing it somehow.
You could try giving it a complete path:
#include "/usr/share/modbus/modbus.h"
(quotes rather than braces, I think, for an explicit path)
Or, maybe
#include <modbus/modbus.h>
As libmodbus installs into a directory.
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Cheers, Gene Heskett.
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