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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        */
/*                                                                           */
/*===========================================================================*/
/*                               CLOCK MODULE                                */
/*---------------------------------------------------------------------------*/
/* Test the clock module:                                                    */
/*                        - Check the MCLK clock generation.                 */
/*                                                                           */
/* 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   DMEM_BASE, (__data_start     )
.set   DMEM_200,  (__data_start+0x00)
.set   DMEM_250,  (__data_start+0x50)

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

.macro LPM_CUSTOM               ; # Stop CPU and LFXT oscillator
 bis    #0x0030, r2
.endm
.macro LPM_CUSTOM_exit
 bic    #0x0030, @r1
.endm

        
WAIT_FUNC:
        dec r14
        jnz WAIT_FUNC
        ret
        
main:
        mov #DMEM_250, r1       ; # Initialize stack pointer
        eint                    ; # Enable interrupts
        
        mov   #0x0000, &DMEM_200
        mov   #0x0000, r15
        mov   #0x0000, r10

        
      /* --------------      MCLK GENERATION - LFXT_CLK INPUT    ----------------- */
        
        mov.b  #0x80, &BCSCTL2  ; # Div /1
        mov    #0x0003, r14
        call   #WAIT_FUNC

        mov    #0x0001, r15     ; # First make sure CPU runs with LFXT_CLK
        mov    #0x000A, r14
        call   #WAIT_FUNC

        mov    #0x0002, r15     ; # Make sure the CPU stops and LFXT oscillator too
        LPM_CUSTOM

        mov    #0x0003, r15     ; # Make sure CPU re-runs with LFXT_CLK
        mov    #0x000A, r14
        call   #WAIT_FUNC
        
        mov    #0x0004, r15
                                

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


        /* ----------------------    FUNCTIONS    --------------- */

IRQ00_ROUTINE:
        add #0x5678, r10
        LPM_CUSTOM_exit
        reti

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

.section .vectors, "a"
.word IRQ00_ROUTINE      ; 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 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