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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:                                                    */
/*                        - Watchdog mode.                                   */
/*                                                                           */
/* Author(s):                                                                */
/*             - Olivier Girard,    olgirard@gmail.com                       */
/*                                                                           */
/*---------------------------------------------------------------------------*/
/* $Rev: 18 $                                                                */
/* $LastChangedBy: olivier.girard $                                          */
/* $LastChangedDate: 2009-08-04 23:44:12 +0200 (Tue, 04 Aug 2009) $          */
/*===========================================================================*/

.global main

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

        
main:

        /* --------------   WATCHDOG TEST:  STARTUP SEQUENCE  --------------- */

        mov   &IFG1, r4         ;# Check if we come out of a watchdog reset
        cmp #0x0000, r4
        jeq   RD_WR_ACCESS

        mov &0x0250, r15        ;# If yes, check RAM variable to see where to go next

        cmp #0x0000, r15
        jeq   RESET_64
        cmp #0x1000, r15
        jeq   RESET_512
        cmp #0x2000, r15
        jeq   RESET_8192
        cmp #0x3000, r15
        jeq   RESET_32768
        cmp #0x4000, r15
        jeq   CHECK_32768
        
        jmp  end_of_test

        
        /* --------------   WATCHDOG TEST:  RD/WR ACCESS    --------------- */
RD_WR_ACCESS:
        mov  #0x0000, &0x0250

        mov  &WDTCTL, &0x0200
        mov  #0x5aff, &WDTCTL
        mov  &WDTCTL, &0x0202
        mov  #0x5a55, &WDTCTL
        mov  &WDTCTL, &0x0204
        mov  #0x5aaa, &WDTCTL
        mov  &WDTCTL, &0x0206
        mov  #0x5a00, &WDTCTL
        mov  &WDTCTL, &0x0208

        mov  #0xDEAD, &WDTCTL    ;# Generate reset through wrong password 
        
        jmp  end_of_test         ;# Force end of test if watchdog reset don't happen


                
        /* --------------   WATCHDOG TEST:  WATCHODG MODE /64  ------------ */
RESET_64:
        bic.b #0x01,   &IFG1
        mov   #0x1000, &0x0250
        
        mov   #0x5a0b, &WDTCTL   ;# Enable watchdog mode /64 & clear counter

        mov   #0x0000, &0x0200
wait_loop_64:
        inc   &0x0200
        jmp   wait_loop_64

        jmp   end_of_test        ;# Force end of test if watchdog reset don't happen
        


        /* --------------   WATCHDOG TEST:  INTERVAL MODE /512  ------------ */
RESET_512:
        bic.b #0x01,   &IFG1
        mov   #0x2000, &0x0250

        mov   #0x5a0a, &WDTCTL    ;# Enable watchdog mode /512 & clear counter

        mov   #0x0000, &0x0202
wait_loop_512:
        inc   &0x0202
        jmp   wait_loop_512
        
        jmp   end_of_test         ;# Force end of test if watchdog reset don't happen


        
        /* --------------   WATCHDOG TEST:  INTERVAL MODE /8192  ------------ */
RESET_8192:
        bic.b #0x01,   &IFG1
        mov   #0x3000, &0x0250

        mov   #0x5a09, &WDTCTL    ;# Enable watchdog mode /8192 & clear counter

        mov   #0x0000, &0x0204
wait_loop_8192:
        inc   &0x0204
        jmp   wait_loop_8192
        
        jmp   end_of_test         ;# Force end of test if watchdog reset don't happen

        
        
        /* --------------   WATCHDOG TEST:  INTERVAL MODE /32768  ------------ */
RESET_32768:
        bic.b #0x01,   &IFG1
        mov   #0x4000, &0x0250

        mov   #0x5a08, &WDTCTL    ;# Enable interval mode /32768 & clear counter

        mov   #0x0000, &0x0206
wait_loop_32768:
        inc   &0x0206
        jmp   wait_loop_32768
        
        jmp   end_of_test         ;# Force end of test if watchdog reset don't happen

        
CHECK_32768:
        bic.b #0x01,   &IFG1
        mov   #0x5000, &0x0250
        

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


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

WDOG_VECTOR:
        bis  #0x3400, r5
        mov    &IFG1, r6
        mov       r4, r7
        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