/* output.host.c */ /* io-hub - Modular Input/Output. {{{ * * Copyright (C) 2012 Nicolas Schodet * * APBTeam: * Web: http://apbteam.org/ * Email: team AT apbteam DOT org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * }}} */ #include "common.h" #include "output.h" #include "modules/host/host.h" #include "modules/host/mex.h" /** Host output context. */ struct output_host_t { /** Previous sent state. */ uint32_t previous; /** Message type. */ uint8_t mtype; }; /** Global context. */ static struct output_host_t output_host_global; #define ctx output_host_global void output_host_init (void) { const char *mex_instance = host_get_instance ("io-hub0", 0); ctx.mtype = mex_node_reservef ("%s:output", mex_instance); ctx.previous = (uint32_t) -1; } void output_host_update (void) { uint32_t new = 0, bit = 1; /* Collect all output states. */ #define OUTPUT(io, init) do { \ if (IO_PORT_ (io) & IO_BV_ (io)) \ new |= bit; \ bit <<= 1; \ } while (0); // <- do not copy this code unless you know why! OUTPUT_LIST #undef OUTPUT /* If changed, sent it. */ if (ctx.previous != new) { mex_msg_t *m = mex_msg_new (ctx.mtype); mex_msg_push (m, "L", new); mex_node_send (m); ctx.previous = new; } }