cpu/msp430/minileds.c

   1 /*
   2  * Copyright (c) 2006, Swedish Institute of Computer Science
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)$Id: minileds.c,v 1.1 2006/09/27 09:32:08 bg- Exp $
  30  */
  31
  32 /*
  33  * Minileds is intended to substitute the full leds package when only
  34  * a small portion of the full functionality is required. It is
  35  * intended to be syntactically compatible but with a simplified
  36  * semantics. The semantic difference lies in not counting the number
  37  * of leds_on and leds_off:s. It saves a substantial amount of RAM
  38  * (820 bytes on a msp430).
  39  */
  40
  41 #include <io.h>
  42
  43 #include "contiki.h"
  44
  45 #include "dev/leds.h"
  46
  47 void
  48 leds_init(void)
  49 {
  50   LEDS_PxDIR |= (LEDS_CONF_RED | LEDS_CONF_GREEN | LEDS_CONF_YELLOW);
  51   LEDS_PxOUT |= (LEDS_CONF_RED | LEDS_CONF_GREEN | LEDS_CONF_YELLOW);
  52 }
  53
  54 static const unsigned char l2p[LEDS_ALL + 1] = {
  55   0,
  56   LEDS_CONF_GREEN,
  57   LEDS_CONF_YELLOW,
  58   LEDS_CONF_YELLOW | LEDS_CONF_GREEN,
  59   LEDS_CONF_RED,
  60   LEDS_CONF_RED | LEDS_CONF_GREEN,
  61   LEDS_CONF_RED | LEDS_CONF_YELLOW,
  62   LEDS_CONF_RED | LEDS_CONF_YELLOW | LEDS_CONF_GREEN
  63 };
  64
  65
  66 void
  67 leds_on(unsigned char leds)
  68 {
  69   LEDS_PxOUT &= ~l2p[leds & LEDS_ALL];
  70 }
  71
  72 void
  73 leds_off(unsigned char leds)
  74 {
  75   LEDS_PxOUT |= l2p[leds & LEDS_ALL];
  76 }
  77
  78 void
  79 leds_toggle(unsigned char leds)
  80 {
  81   /*
  82    * Synonym: void leds_invert(unsigned char leds);
  83    */
  84   asm(".global leds_invert\nleds_invert:\n");
  85
  86   LEDS_PxOUT ^= l2p[leds & LEDS_ALL];
  87 }