| 1 |
76 |
olivier.gi |
/*===========================================================================*/
|
| 2 |
|
|
/* Copyright (C) 2001 Authors */
|
| 3 |
|
|
/* */
|
| 4 |
|
|
/* This source file may be used and distributed without restriction provided */
|
| 5 |
|
|
/* that this copyright statement is not removed from the file and that any */
|
| 6 |
|
|
/* derivative work contains the original copyright notice and the associated */
|
| 7 |
|
|
/* disclaimer. */
|
| 8 |
|
|
/* */
|
| 9 |
|
|
/* This source file is free software; you can redistribute it and/or modify */
|
| 10 |
|
|
/* it under the terms of the GNU Lesser General Public License as published */
|
| 11 |
|
|
/* by the Free Software Foundation; either version 2.1 of the License, or */
|
| 12 |
|
|
/* (at your option) any later version. */
|
| 13 |
|
|
/* */
|
| 14 |
|
|
/* This source is distributed in the hope that it will be useful, but WITHOUT*/
|
| 15 |
|
|
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
|
| 16 |
|
|
/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
|
| 17 |
|
|
/* License for more details. */
|
| 18 |
|
|
/* */
|
| 19 |
|
|
/* You should have received a copy of the GNU Lesser General Public License */
|
| 20 |
|
|
/* along with this source; if not, write to the Free Software Foundation, */
|
| 21 |
|
|
/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
|
| 22 |
|
|
/* */
|
| 23 |
|
|
/*===========================================================================*/
|
| 24 |
|
|
/* SANDBOX */
|
| 25 |
|
|
/*---------------------------------------------------------------------------*/
|
| 26 |
|
|
/* */
|
| 27 |
|
|
/* Author(s): */
|
| 28 |
|
|
/* - Olivier Girard, olgirard@gmail.com */
|
| 29 |
|
|
/* */
|
| 30 |
|
|
/*---------------------------------------------------------------------------*/
|
| 31 |
|
|
/* $Rev: 19 $ */
|
| 32 |
|
|
/* $LastChangedBy: olivier.girard $ */
|
| 33 |
|
|
/* $LastChangedDate: 2009-08-04 23:47:15 +0200 (Tue, 04 Aug 2009) $ */
|
| 34 |
|
|
/*===========================================================================*/
|
| 35 |
|
|
|
| 36 |
141 |
olivier.gi |
#include "omsp_system.h"
|
| 37 |
76 |
olivier.gi |
|
| 38 |
|
|
volatile char shift_direction = 0x01; // Global variable
|
| 39 |
|
|
|
| 40 |
|
|
int main(void) {
|
| 41 |
|
|
|
| 42 |
|
|
WDTCTL = WDTPW | WDTHOLD; // Disable watchdog timer
|
| 43 |
|
|
|
| 44 |
|
|
P2DIR = 0xff; // Port 2.0-2.7 = output
|
| 45 |
|
|
P2OUT = shift_direction; // Initialize Port 2
|
| 46 |
|
|
|
| 47 |
|
|
P1DIR = 0x00; // Port 1.0-1.7 = input
|
| 48 |
|
|
P1IE = 0x01; // Port 1.0 interrupt enabled
|
| 49 |
|
|
P1IES = 0x00; // Port 1.0 interrupt edge selection (0=pos 1=neg)
|
| 50 |
|
|
P1IFG = 0x00; // Clear all Port 1 interrupt flags (just in case)
|
| 51 |
|
|
|
| 52 |
|
|
eint(); // Enable interrupts
|
| 53 |
|
|
|
| 54 |
|
|
while (1) {
|
| 55 |
|
|
if (P2OUT == 0x00) {
|
| 56 |
|
|
P2OUT = shift_direction;
|
| 57 |
|
|
|
| 58 |
|
|
} else if (shift_direction == 0x01) {
|
| 59 |
|
|
P2OUT = (P2OUT << 1);
|
| 60 |
|
|
|
| 61 |
|
|
} else {
|
| 62 |
|
|
P2OUT = (P2OUT >> 1);
|
| 63 |
|
|
}
|
| 64 |
|
|
}
|
| 65 |
|
|
}
|
| 66 |
|
|
|
| 67 |
|
|
// Port1 Interrupt Service Routine using msp430-gcc
|
| 68 |
|
|
interrupt(PORT1_VECTOR) port1_isr(void) {
|
| 69 |
|
|
if (P1IFG & 0x01) {
|
| 70 |
|
|
shift_direction ^= 0x81;
|
| 71 |
|
|
P1IFG &= ~0x01; // Clear Port 1.0 interrupt flag
|
| 72 |
|
|
}
|
| 73 |
|
|
}
|
