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/*===========================================================================*/
/* Copyright (C) 2001 Authors                                                */
/*                                                                           */
/* This source file may be used and distributed without restriction provided */
/* that this copyright statement is not removed from the file and that any   */
/* derivative work contains the original copyright notice and the associated */
/* disclaimer.                                                               */
/*                                                                           */
/* This source file is free software; you can redistribute it and/or modify  */
/* it under the terms of the GNU Lesser General Public License as published  */
/* by the Free Software Foundation; either version 2.1 of the License, or    */
/* (at your option) any later version.                                       */
/*                                                                           */
/* This source 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 Lesser General Public       */
/* License for more details.                                                 */
/*                                                                           */
/* You should have received a copy of the GNU Lesser General Public License  */
/* along with this source; if not, write to the Free Software Foundation,    */
/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA        */
/*                                                                           */
/*===========================================================================*/
/*                            WATCHDOG TIMER                                 */
/*---------------------------------------------------------------------------*/
/* Test the Watdog timer:                                                    */
/*                        - Clock source selection.                          */
/*                                                                           */
/* Author(s):                                                                */
/*             - Olivier Girard,    olgirard@gmail.com                       */
/*                                                                           */
/*---------------------------------------------------------------------------*/
/* $Rev: 19 $                                                                */
/* $LastChangedBy: olivier.girard $                                          */
/* $LastChangedDate: 2009-08-04 23:47:15 +0200 (Tue, 04 Aug 2009) $          */
/*===========================================================================*/

.global main

.set   BCSCTL1, 0x0057
.set   BCSCTL2, 0x0058

.set   IE1,    0x0000
.set   IFG1,   0x0002
.set   WDTCTL, 0x0120

WAIT_FUNC:
        dec r14
        jnz WAIT_FUNC
        ret
        
main:

        /* -------   WATCHDOG TEST INTERVAL MODE /64 - SMCLK /2      ------ */

        mov   #0x0250, r1         ;# Initialize stack & Enable interrupts
        eint
        bis.b   #0x01,   &IE1

        mov.b   #0x02, &BCSCTL2   ;# SMCLK = MCLK/2
        mov   #0x5a1b, &WDTCTL    ;# Enable interval mode /64 & clear counter
        mov   #0x0001, r15

        mov   #0x0170, r14
        call  #WAIT_FUNC
        
        mov   #0x1000, r15

        
        /* -------   WATCHDOG TEST INTERVAL MODE /64 - ACLK        ------ */

        mov   #0x0250, r1         ;# Initialize stack & Enable interrupts
        eint
        bis.b   #0x01,   &IE1

        mov.b   #0x00, &BCSCTL1   ;# ACLK = LFXTCLK/1
        mov   #0x5a1f, &WDTCTL    ;# Enable interval mode /64 & clear counter
        mov   #0x1001, r15

        mov   #0x1000, r14
        call  #WAIT_FUNC
        
        mov   #0x2000, r15

        

        /* ----------------------         END OF TEST        --------------- */
end_of_test:
        nop
        br #0xffff


        /* ----------------------      INTERRUPT ROUTINES    --------------- */

WDOG_VECTOR:
        xor  #0x0001, r5        ; # Toggle r5[0] for testbench stimulus check
        reti


        /* ----------------------         INTERRUPT VECTORS  --------------- */

.section .vectors, "a"
.word end_of_test  ; Interrupt  0 (lowest priority)    <unused>
.word end_of_test  ; Interrupt  1                      <unused>
.word end_of_test  ; Interrupt  2                      <unused>
.word end_of_test  ; Interrupt  3                      <unused>
.word end_of_test  ; Interrupt  4                      <unused>
.word end_of_test  ; Interrupt  5                      <unused>
.word end_of_test  ; Interrupt  6                      <unused>
.word end_of_test  ; Interrupt  7                      <unused>
.word end_of_test  ; Interrupt  8                      <unused>
.word end_of_test  ; Interrupt  9                      <unused>
.word WDOG_VECTOR  ; Interrupt 10                      Watchdog timer
.word end_of_test  ; Interrupt 11                      <unused>
.word end_of_test  ; Interrupt 12                      <unused>
.word end_of_test  ; Interrupt 13                      <unused>
.word end_of_test  ; Interrupt 14                      NMI
.word main         ; Interrupt 15 (highest priority)   RESET