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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        */
/*                                                                           */
/*===========================================================================*/
/*                            CPU OPERATING MODES                            */
/*---------------------------------------------------------------------------*/
/* Test the CPU Operating modes:                                             */
/*                                 - CPUOFF (<=> R2[4]): turn off CPU.       */
/*                                 - OSCOFF (<=> R2[5]): turn off LFXT_CLK.  */
/*                                 - SCG1   (<=> R2[7]): turn off SMCLK.     */
/*===========================================================================*/

.global main

.set   P1IN,  0x0020
.set   P1OUT, 0x0021
.set   P1DIR, 0x0022
.set   P1IFG, 0x0023
.set   P1IES, 0x0024
.set   P1IE,  0x0025
.set   P1SEL, 0x0026
.set   P2IN,  0x0028
.set   P2OUT, 0x0029
.set   P2DIR, 0x002A
.set   P2IFG, 0x002B
.set   P2IES, 0x002C
.set   P2IE,  0x002D
.set   P2SEL, 0x002E

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

        
WAIT_FUNC:
        dec r14
        jnz WAIT_FUNC
        ret
        
main:
        ; Enable GPIO interrupts on P1[0]
        mov.b #0x00, &P1DIR
        mov.b #0x00, &P1IFG
        mov.b #0x00, &P1IES
        mov.b #0x01, &P1IE

        ; Initialize stack and enable global interrupts
        mov   #0x0250, r1
        eint

        mov    #0x1000, r15

        
        /* -------------- SCG1   (<=> R2[7]): turn off SMCLK --------------- */

        mov.b  #0x06, &BCSCTL2  ; # Div /8

        mov    #0x0008, r2      ; # SCG1=0 (SMCLK on)
        mov    #0x1001, r15
        mov    #0x0020, r14
        call   #WAIT_FUNC

        mov    #0x0088, r2      ; # SCG1=1 (SMCLK off)
        mov    #0x1002, r15
        mov    #0x0020, r14
        call   #WAIT_FUNC

        mov    #0x1003, r15      ; # SCG1=1 (SMCLK off) with IRQ
        mov    #0x0020, r14
        call   #WAIT_FUNC

        mov    #0x1004, r15      ; # SCG1=1 (SMCLK off) return from IRQ
        mov    #0x0020, r14
        call   #WAIT_FUNC

        mov    #0x0008, r2      ; # SCG1=0 (SMCLK on)
        mov    #0x1005, r15
        mov    #0x0020, r14
        call   #WAIT_FUNC
        
        mov     #0x2000, r15

        
        /* -------------- OSCOFF (<=> R2[5]): turn off LFXT1CLK --------------- */

        mov.b  #0x00, &BCSCTL2  ; # Div /1 --> select DCOCLK
        mov    #0x0008, r2      ; # OSCOFF=0 (LFXT1 on)
        mov    #0x2001, r15
        mov    #0x0050, r14
        call   #WAIT_FUNC

        mov.b  #0x00, &BCSCTL2  ; # Div /1 --> select DCOCLK
        mov    #0x0028, r2      ; # OSCOFF=1 (LFXT1 off)
        mov    #0x2002, r15
        mov    #0x0050, r14
        call   #WAIT_FUNC

        mov    #0x2003, r15      ; # OSCOFF=1 (LFXT1 off) with IRQ
        mov    #0x0050, r14
        call   #WAIT_FUNC

        mov    #0x2004, r15      ; # OSCOFF=1 (LFXT1 off) return from IRQ
        mov    #0x0050, r14
        call   #WAIT_FUNC
        
        mov.b  #0x08, &BCSCTL2  ; # Div /1 --> select LFXT1CLK
        mov    #0x0028, r2      ; # OSCOFF=1 (LFXT1 off)
        mov    #0x2005, r15
        mov    #0x0050, r14
        call   #WAIT_FUNC

        mov.b  #0x00, &BCSCTL2  ; # Div /1 --> select DCOCLK
        mov    #0x0008, r2      ; # OSCOFF=0 (LFXT1 on)
        mov    #0x2006, r15
        mov    #0x0050, r14
        call   #WAIT_FUNC
        
        mov     #0x3000, r15

        
        /* -------------- CPUOFF (<=> R2[4]): turn off CPU    --------------- */

        ; Enable GPIO interrupts on P2[0]
        mov.b #0x00, &P2DIR
        mov.b #0x00, &P2IFG
        mov.b #0x00, &P2IES
        mov.b #0x01, &P2IE

        mov.b  #0x00, &BCSCTL2  ; # Div /1 --> select DCOCLK

        mov    #0x3001, r15
        mov    #0x0008, r2      ; # CPUOFF=0 (CPU on)
        mov    #0x0020, r14
        call   #WAIT_FUNC

        mov    #0x3002, r15
        mov    #0x0018, r2      ; # CPUOFF=1 (CPU off)
        mov    #0x0020, r14
        call   #WAIT_FUNC

        mov    #0x3003, r15
        mov    #0x0008, r2      ; # CPUOFF=0 (CPU on)
        mov    #0x0020, r14
        call   #WAIT_FUNC

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

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

PORT1_VECTOR:
        push       r14
        mov    #0x0050, r14
        call   #WAIT_FUNC
        pop        r14
        mov.b #0x00, &P1IFG
        reti    

PORT2_VECTOR:
        push       r14
        mov    #0x0050, r14
        call   #WAIT_FUNC
        pop        r14
        mov.b #0x00, &P2IFG
        bic    #0x10, 0(r1) ;exit lowpower mode
        reti    


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

.section .vectors, "a"
.word end_of_test  ; Interrupt  0 (lowest priority)    <unused>
.word end_of_test  ; Interrupt  1                      <unused>
.word PORT1_VECTOR ; Interrupt  2                      <unused>
.word PORT2_VECTOR ; 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 end_of_test  ; 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