106 lines
5.4 KiB
NASM
Executable File
106 lines
5.4 KiB
NASM
Executable File
; --COPYRIGHT--,BSD_EX
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; Copyright (c) 2012, Texas Instruments Incorporated
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions
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; are met:
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;
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; * Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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;
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; * Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution.
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;
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; * Neither the name of Texas Instruments Incorporated nor the names of
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; its contributors may be used to endorse or promote products derived
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; from this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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; EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;
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; ******************************************************************************
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;
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; MSP430 CODE EXAMPLE DISCLAIMER
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;
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; MSP430 code examples are self-contained low-level programs that typically
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; demonstrate a single peripheral function or device feature in a highly
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; concise manner. For this the code may rely on the device's power-on default
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; register values and settings such as the clock configuration and care must
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; be taken when combining code from several examples to avoid potential side
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; effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
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; for an API functional library-approach to peripheral configuration.
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;
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; --/COPYRIGHT--
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;*******************************************************************************
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; MSP430F20xx Demo - Basic Clock, LPM3 Using WDT ISR, 32kHz ACLK
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;
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; Description: This program operates MSP430 normally in LPM3, pulsing P1.0
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; at 4 second intervals. WDT ISR used to wake-up system. All I/O configured
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; as low outputs to eliminate floating inputs. Current consumption does
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; increase when LED is powered on P1.0. Demo for measuring LPM3 current.
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; ACLK = LFXT1/4 = 32768/4, MCLK = SMCLK = default DCO
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; //* External watch crystal installed on XIN XOUT is required for ACLK *//
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;
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; MSP430F20xx
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; -----------------
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; /|\| XIN|-
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; | | | 32kHz
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; --|RST XOUT|-
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; | |
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; | P1.0|-->LED
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;
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; P.Thanigai
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; Texas Instruments Inc.
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; May 2007
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; Built with Code Composer Essentials Version: 2.0
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;*******************************************************************************
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.cdecls C,LIST, "msp430.h"
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;-------------------------------------------------------------------------------
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.def RESET ; Export program entry-point to
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; make it known to linker.
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;------------------------------------------------------------------------------
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.text ; Progam Start
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;------------------------------------------------------------------------------
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RESET mov.w #0280h,SP ; Initialize stackpointer
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SetupWDT mov.w #WDT_ADLY_1000,&WDTCTL ; WDT 1s*4 interval timer
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SetupBC bis.b #DIVA_2,&BCSCTL1 ; ACLK/4
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bis.b #WDTIE,&IE1 ; Enable WDT interrupt
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SetupP1 mov.b #0FFh,&P1DIR ; All P1.x outputs
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clr.b &P1OUT ; All P1.x reset
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SetupP2 mov.b #0FFh,&P2DIR ; All P2.x outputs
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clr.b &P2OUT ; All P2.x reset
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;
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Mainloop bis.b #001h,&P1OUT ; Set P1.0
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push.w #5000 ; Delay to TOS
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Delay dec.w 0(SP) ; Decrement TOS
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jnz Delay ; Delay over?
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incd.w SP ; Clean stack
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bic.b #001h,&P1OUT ; Reset P1.0
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bis.w #LPM3+GIE,SR ; Enter LPM3, enable interrupts
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jmp Mainloop ; Again
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;
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;-------------------------------------------------------------------------------
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WDT_ISR ; Exit LPM3 on reti
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;-------------------------------------------------------------------------------
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bic.w #LPM3,0(SP) ; Clear LPM3 from TOS
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reti ;
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;
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;------------------------------------------------------------------------------
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; Interrupt Vectors
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;------------------------------------------------------------------------------
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.sect ".reset" ; MSP430 RESET Vector
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.short RESET ;
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.end
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