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olivier.gi |
/*===========================================================================*/
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/* Copyright (C) 2001 Authors */
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/* */
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/* This source file may be used and distributed without restriction provided */
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/* that this copyright statement is not removed from the file and that any */
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/* derivative work contains the original copyright notice and the associated */
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/* disclaimer. */
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/* */
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/* This source file is free software; you can redistribute it and/or modify */
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/* it under the terms of the GNU Lesser General Public License as published */
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/* by the Free Software Foundation; either version 2.1 of the License, or */
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/* (at your option) any later version. */
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/* */
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/* This source is distributed in the hope that it will be useful, but WITHOUT*/
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
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/* License for more details. */
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/* */
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/* You should have received a copy of the GNU Lesser General Public License */
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/* along with this source; if not, write to the Free Software Foundation, */
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/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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/* */
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/*===========================================================================*/
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/* SANDBOX */
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/*---------------------------------------------------------------------------*/
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/* */
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/* Author(s): */
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/* - Olivier Girard, olgirard@gmail.com */
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/* */
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/*---------------------------------------------------------------------------*/
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/* $Rev: 19 $ */
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/* $LastChangedBy: olivier.girard $ */
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/* $LastChangedDate: 2009-08-04 23:47:15 +0200 (Tue, 04 Aug 2009) $ */
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/*===========================================================================*/
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#include <msp430x11x1.h>
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#include <signal.h> // Needed for using interrupts with msp430-gcc
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volatile char shift_direction = 0x01; // Global variable
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int main(void) {
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WDTCTL = WDTPW | WDTHOLD; // Disable watchdog timer
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P2DIR = 0xff; // Port 2.0-2.7 = output
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P2OUT = shift_direction; // Initialize Port 2
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P1DIR = 0x00; // Port 1.0-1.7 = input
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P1IE = 0x01; // Port 1.0 interrupt enabled
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P1IES = 0x00; // Port 1.0 interrupt edge selection (0=pos 1=neg)
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P1IFG = 0x00; // Clear all Port 1 interrupt flags (just in case)
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eint(); // Enable interrupts
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while (1) {
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if (P2OUT == 0x00) {
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P2OUT = shift_direction;
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} else if (shift_direction == 0x01) {
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P2OUT = (P2OUT << 1);
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} else {
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P2OUT = (P2OUT >> 1);
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}
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}
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}
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// Port1 Interrupt Service Routine using msp430-gcc
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interrupt(PORT1_VECTOR) port1_isr(void) {
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if (P1IFG & 0x01) {
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shift_direction ^= 0x81;
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P1IFG &= ~0x01; // Clear Port 1.0 interrupt flag
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}
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}
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