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Imants Pulkstenis
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; --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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; MSP430F20F3 Demo - SD16, Using the Integrated Temperature Sensor
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;
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; Description: Use SD16 and it's integrated temperature sensor to detect
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; temperature delta. The temperature sensor output voltage is sampled
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; ~ every 240ms and compared with the last value and if more than ~0.5C
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; delta, P1.0 is set, else reset.
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; SD16 Internal VRef, Bipolar offset binary output format used.
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; Watchdog used as interval time and ISR used to start next SD16 conversion.
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; ACLK = n/a, MCLK = default DCO, SMCLK = SD16CLK = default DCO/8
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;
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; MSP430F20xx
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; -----------------
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; /|\| XIN|-
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; | | |
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; --|RST XOUT|-
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; | |
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; |A6+ |
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; |A6- 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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ADCDeltaOn .equ 31 ; ~ 0.5 Deg C delta for LED on
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; CPU Registers Used
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LastADCVal .equ R4
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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 ; Program Start
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;------------------------------------------------------------------------------
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RESET mov.w #0280h,SP ; Initialize stackpointer
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bis.b #DIVS_3,&BCSCTL2 ; SMCLK/8
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SetupWDT mov.w #WDT_MDLY_32,&WDTCTL ; WDT Timer interval
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bis.b #WDTIE,&IE1 ; Enable WDT interrupt
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SetupP1 bis.b #001h,&P1DIR ; P1.0 output
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SetupSD16 mov.w #SD16REFON+SD16SSEL_1,&SD16CTL ; 1.2V ref, SMCLK
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mov.b #SD16INCH_6,&SD16INCTL0 ; A6+/-
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mov.w #SD16SNGL+SD16IE,&SD16CCTL0 ; Single conv, interrupt
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;
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Mainloop bis.w #CPUOFF+GIE,SR ; CPU off, enable interrupts
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nop ; Required only for debugger
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;
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;-------------------------------------------------------------------------------
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SD16_ISR;
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;-------------------------------------------------------------------------------
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add.w #ADCDeltaOn,LastADCVal ;
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bic.b #01h,&P1OUT ; LED off
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cmp.w LastADCVal,&SD16MEM0 ; Clears IFG
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jlo SD16_ISR_1 ;
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bis.b #01h,&P1OUT ; LED on
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SD16_ISR_1 mov.w &SD16MEM0,LastADCVal ; Store value
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reti ;
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;
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;-------------------------------------------------------------------------------
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WDT_ISR;
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;-------------------------------------------------------------------------------
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bis.w #SD16SC,&SD16CCTL0 ; Start conversion
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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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.sect ".int10" ; Watchdog Vector
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.short WDT_ISR ;
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.sect ".int05" ; SD16 Vector
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.short SD16_ISR ;
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.end
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