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Imants Pulkstenis
2019-11-12 23:43:53 +02:00
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; --COPYRIGHT--,BSD_EX
; Copyright (c) 2012, Texas Instruments Incorporated
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions
; are met:
;
; * Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
;
; * Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
;
; * Neither the name of Texas Instruments Incorporated nor the names of
; its contributors may be used to endorse or promote products derived
; from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
; EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;
; ******************************************************************************
;
; MSP430 CODE EXAMPLE DISCLAIMER
;
; MSP430 code examples are self-contained low-level programs that typically
; demonstrate a single peripheral function or device feature in a highly
; concise manner. For this the code may rely on the device's power-on default
; register values and settings such as the clock configuration and care must
; be taken when combining code from several examples to avoid potential side
; effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
; for an API functional library-approach to peripheral configuration.
;
; --/COPYRIGHT--
;*******************************************************************************
; MSP430F20x3 Demo - SD16A, Sample A1+ Continuously, Set P1.0 if > 0.3V
;
; Description: A continuous single-ended sample is made on A1+ using internal
; VREf. Unipolar output format used.
; Inside of SD16 ISR, if A1 > 1/2VRef (0.3V), P1.0 set, else reset.
; ACLK = n/a, MCLK = SMCLK = SD16CLK = default DCO
;
; MSP430F20x3
; ------------------
; /|\| XIN|-
; | | |
; --|RST XOUT|-
; | |
; Vin+ -->|A1+ P1.2 |
; |A1- = VSS P1.0|-->LED
; | |
;
; P.Thanigai
; Texas Instruments Inc.
; May 2007
; Built with Code Composer Essentials Version: 2.0
;*******************************************************************************
.cdecls C,LIST, "msp430.h"
;-------------------------------------------------------------------------------
.def RESET ; Export program entry-point to
; make it known to linker.
;------------------------------------------------------------------------------
.text ; Program Start
;------------------------------------------------------------------------------
RESET mov.w #0280h,SP ; Initialize stackpointer
StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT
SetupP1 bis.b #001h,&P1DIR ; P1.0 output
SetupSD16 mov.w #SD16REFON+SD16SSEL_1,&SD16CTL ; 1.2V ref, SMCLK
mov.b #SD16INCH_1,&SD16INCTL0 ; A1+/-
mov.w #SD16UNI+SD16IE,&SD16CCTL0 ; 256OSR, unipolar, inter
mov.b #SD16AE2,&SD16AE ; P1.1 A1+, A1- = VSS
bis.w #SD16SC,&SD16CCTL0 ; Start conversion
;
Mainloop bis.w #CPUOFF+GIE,SR ; CPU off, enable interrupts
nop ; Required only for debugger
;
;-------------------------------------------------------------------------------
SD16_ISR;
;-------------------------------------------------------------------------------
bic.b #01h,&P1OUT ;
cmp.w #07FFFh,&SD16MEM0 ; SD16MEM0 > 0.3V?, clears IFG
jlo Done ;
bis.b #01h,&P1OUT ;
Done reti ;
;
;------------------------------------------------------------------------------
; Interrupt Vectors
;------------------------------------------------------------------------------
.sect ".reset" ; MSP430 RESET Vector
.short RESET ;
.sect ".int05" ; SD16 Vector
.short SD16_ISR ;
.end