gistfile1.txt

27> [pie:gpio_init(Pin, input) || Pin <- Pins].                                            
["R15B03/lib/runtime_tools-1.8.9/ebin",
 "R15B03/lib/runtime_tools-1.8.9/ebin",
 "R15B03/lib/runtime_tools-1.8.9/ebin"]

static ERL_NIF_TERM
gpio_init_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    int pin, mode;
    if (!enif_get_int(env, argv[0], &pin) ||
        !enif_get_int(env, argv[1], &mode))
    {  
        return enif_make_badarg(env);
    }
    return gpio_init(pin, mode) == 1 ? atom_ok : error_failed_tuple;
}