97 lines
4.8 KiB
NASM
Executable File
97 lines
4.8 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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; MSP430F20x1 Demo - Comp_A, Detect Threshold, Set P1.0 if P1.1 > 0.25*Vcc
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;
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; Description: Use comparator_A to detect a voltage threshold. Using an
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; external potentiometer, an unknown analog voltage is applied to P1.1.
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; Comparator_A compares the unknown voltage to an internal reference
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; voltage, in this example 0.25*VCC. If the interesting voltage is higher
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; than 0.25*Vcc, P1.0 is set, if not, P1.0 is reset.
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; ACLK = n/a, MCLK = SMCLK = default
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;
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; MSP430F20x1
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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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; R<-|P1.1/CA1 P1.0|--> LED
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; | | |
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; ---|VSS
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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 ; Program Start
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;------------------------------------------------------------------------------
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RESET mov.w #0280h,SP ; Initialize stackpointer
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StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT
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SetupP1 bis.b #001h,&P1DIR ; P1.0 = output
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mov.b #CARSEL+CAREF0+CAON,&CACTL1 ; 0.25Vcc = -comp, on
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mov.b #P2CA4,&CACTL2 ; P1.1/CA1 = +comp
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;
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Mainloop bit.b #CAOUT,&CACTL2 ; Test comparator_A output
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jz OFF ; jmp--> if CAOUT reset
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;
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ON bis.b #001h,&P1OUT ; P1.0 = 1
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jmp Mainloop ;
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OFF bic.b #001h,&P1OUT ; P1.0 = 0
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jmp Mainloop ;
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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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