CanFestival: include/hcs12/asm-m68hc12/portsaccess.h Source File

00001 /*
-00002 This file is part of CanFestival, a library implementing CanOpen Stack. 
-00003 
-00004 Copyright (C): Edouard TISSERANT and Francis DUPIN
-00005 
-00006 See COPYING file for copyrights details.
-00007 
-00008 This library is free software; you can redistribute it and/or
-00009 modify it under the terms of the GNU Lesser General Public
-00010 License as published by the Free Software Foundation; either
-00011 version 2.1 of the License, or (at your option) any later version.
-00012 
-00013 This library is distributed in the hope that it will be useful,
-00014 but WITHOUT ANY WARRANTY; without even the implied warranty of
-00015 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-00016 Lesser General Public License for more details.
-00017 
-00018 You should have received a copy of the GNU Lesser General Public
-00019 License along with this library; if not, write to the Free Software
-00020 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-00021 */
-00022 /*
-00023 Variables to access to the io_ports
-00024 */
-00025 
-00026 
-00027 #ifndef __PORTS_ACCESS__
-00028 #define __PORTS_ACCESS__
-00029 
-00030 /*
-00031 By default the address is 0X0000 on HCS12.
-00032 But the ports can be remaped. See the file ports.h
-00033 */
-00034 
-00035 
-00036 extern volatile unsigned char _io_ports[];
-00037 
-00038 /* To use for a 8 bits access */
-00039 #define IO_PORTS_8(adr) \
-00040 _io_ports[adr]
-00041 
-00042 /* To use for a 16 bits access */
-00043 /* Example : IO_PORTS_16(CAN0IDAR1)= 0xABCD;
-00044 will put AB at @CAN0IDAR1 and CD at  @CAN0IDAR1 + 1
-00045 */
-00046 #define IO_PORTS_16(adr) \
-00047 *((unsigned volatile short*) (_io_ports + (adr)))
-00048 
-00049 #endif
-