Open davidoccam opened 9 years ago
dear Klas, I switched to master branch and all my perceived problems went away. I am using gpio binary and wpi:setup_sys(). and so far no root needed sorry to have raised false problems David Martin
Hi,
No worries. So everything is ok then?
Cheers, Klas
dear Klas,
using git 2.0a tag
NIF would not load so I put in a test for the error.
on_load() -> %% Force wiringPi to return -1 on initalization failure. In %% wiringPi this was not necessary, but starting at v2 the setup %% functions exit instead. a change between wiringPi v1 and v2. %% Use return values in order to provide more erlangy error handling. os:putenv("WIRINGPI_CODES", "true"), case erlang:load_nif(filename:join(code:priv_dir(wpi), "./wpi_drv"), 0) of ok->io:format("wpi on_load ok~n",[]); Error1->io:format("Error in wpi on_load ~p~n",[Error1]) end.
Error in wpi on_load {error, {load_failed, "Failed to load NIF library: '/home/pi/rcouch-newbuild/rel/rcouch/bin/../lib/wpi-0.1/priv/wpi_drv.so: undefined symbol: lcdPosition'"}}
The NIF load continued to fail similarly until I commented out wpi.c lines as follows
160-162 lcdInit 174 lcdHome 186 lcdClear 200 lcdPosition 213 lcdPutchar 231 lcdPuts 245 value=shiftIn..... 269 shiftOut
==> wpi (compile)
The NIF then loaded and worked as expected
(rcouch@127.0.0.1)1> wpi:setup_sys(). wpi on_load ok ok
perhaps I should be using master? It seems only lcd functions are affected and I am not using this so no real problem for me.
thanks for your sharing David Martin