initial commit
This commit is contained in:
Imants Pulkstenis
@@ -0,0 +1,114 @@
|
||||
; --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--
|
||||
;*******************************************************************************
|
||||
; MSP430F20x1 Demo - Comp_A, Simple 2.2V Low Battery Detect
|
||||
;
|
||||
; Description: Two comparator_A reference generators 0.25*Vcc and ~ 0.55V
|
||||
; are compared for a simple battery check of 2.2V. In the subroutine
|
||||
; Batt_Check a small capacitor that must be added to P2.3 is first charged
|
||||
; to 0.25*Vcc and then compared to ~ 0.55V. If 0.25*Vcc,
|
||||
; is above ~0.55V, P1.0 is toggled, else set. Batt_Check is
|
||||
; called constantly in an endless loop - in an actual application,
|
||||
; Batt_Check should be called very infrequently to save power.
|
||||
; ACLK = n/a, MCLK = SMCLK = default DCO
|
||||
;
|
||||
; There is a tolerence of the Comp_A reference generator and in the
|
||||
; device specific datasheet. In most applications, the tolerence of the
|
||||
; reference generator is more than adequate to detect Low Battery.
|
||||
;
|
||||
; MSP430F20x1
|
||||
; -----------------
|
||||
; /|\ | XIN|-
|
||||
; | | |
|
||||
; ---|RST XOUT|-
|
||||
; | |
|
||||
; +-----|P1.1 P1.0|-->LED
|
||||
; | | |
|
||||
; ===.1uf| |
|
||||
; | | |
|
||||
; +-----|VSS
|
||||
;
|
||||
; 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
|
||||
mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT
|
||||
bis.b #001h,&P1DIR ; P1.0 output
|
||||
mov.b #P2CA4,&CACTL2 ; P1.1 = CA1
|
||||
;
|
||||
Mainloop call #Batt_Check ;
|
||||
jmp Mainloop ;
|
||||
;
|
||||
;-------------------------------------------------------------------------------
|
||||
Batt_Check
|
||||
;-------------------------------------------------------------------------------
|
||||
mov.b #CAREF0+CAON,&CACTL1 ; 0.25*Vcc on P2.3, Comp. on
|
||||
Wait clr.w R15 ; Delay to R15
|
||||
L1 dec.w R15 ;
|
||||
jnz L1 ; Delay over?
|
||||
mov.b #CARSEL+CAREF1+CAREF0+CAON,&CACTL1 ; 0.55V on -, Comp. on
|
||||
bit.b #CAOUT,&CACTL2 ;
|
||||
clr.b &CACTL1 ; Disable Comp_A, save power
|
||||
jnc Batt_Low ;
|
||||
xor.b #001h,&P1OUT ; P1.0 toggle
|
||||
ret ;
|
||||
Batt_Low bis.b #001h,&P1OUT ; P1.0 set
|
||||
ret
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
; Interrupt Vectors
|
||||
;------------------------------------------------------------------------------
|
||||
.sect ".reset" ; MSP430 RESET Vector
|
||||
.short RESET ;
|
||||
.end
|
||||
Reference in New Issue
Block a user