NIF does not load due to undefined symbol in wpi.c e.g. 'lcdPosition' and other issues in R17

[davidoccam]

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

([email protected])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

[davidoccam]

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

[klajo]

Hi,

No worries. So everything is ok then?

Cheers, Klas