/* select.c - Output selection mechanism. */ /* dev2 - Multi-purpose development board using USB and Ethernet. {{{ * * Copyright (C) 2009 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 "io.h" #include "select.h" #define ENABLE _BV (2) #define SELA _BV (5) #define SELB _BV (4) /* Initialise selector. */ void select_init (void) { PORTC &= ~(ENABLE | SELA | SELB); DDRC |= ENABLE | SELA | SELB; } /* Select an output (1-4) or switch off (0, anything else). */ void select_out (uint8_t num) { uint8_t p = PORTC & ~(ENABLE | SELA | SELB); switch (num) { case 1: PORTC = p | ENABLE; break; case 2: PORTC = p | ENABLE | SELA; break; case 3: PORTC = p | ENABLE | SELB; break; case 4: PORTC = p | ENABLE | SELA | SELB; break; default: PORTC = p; break; } }