; --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--
;*******************************************************************************
;   MSP430F20x2 Demo - ADC10, Sample A1, 1.5V, TA1 Trig, Set P1.0 if > 0.5V
;
;   Description: A1 is sampled 16/second (ACLK/2048) with reference to 1.5V.
;   Timer_A is run in upmode and TA1 is used to automatically trigger
;   ADC10 conversion, TA0 defines the period. Internal oscillator times sample
;   (16x) and conversion (13x). Inside ADC10_ISR if A1 > 0.5Vcc, P1.0 is set,
;   else reset. Normal mode is LPM3.
;   //* An external watch crystal on XIN XOUT is required for ACLK *//
;
;                MSP430F20x2
;             -----------------
;         /|\|              XIN|-
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;        >---|P1.1/A1      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                           ; Progam Start
;------------------------------------------------------------------------------
RESET       mov.w   #0280h,SP               ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupADC10  mov.w   #SHS_1+CONSEQ_2+INCH_1,&ADC10CTL1 ; TA1 trigger sample start
            mov.w   #SREF_1+ADC10SHT_2+REFON+ADC10ON+ADC10IE,&ADC10CTL0;
            mov.w   #30,&TACCR0             ; Delay to allow Ref to settle
            bis.w   #CCIE,&TACCTL0          ; Compare-mode interrupt.
            mov.w   #TACLR+MC_1+TASSEL_2,&TACTL; up mode, SMCLK
            bis.w   #LPM0+GIE,SR            ; Enter LPM0,enable interrupts
            bic.w   #CCIE,&TACCTL0          ; Disable timer interrupt
            dint                            ; Disable Interrupts
            bis.w   #ENC,&ADC10CTL0         ; ADC10 enable set
            bis.b   #002h,&ADC10AE0         ; P1.1 ADC10 option select
SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output
SetupC0     mov.w   #2048-1,&TACCR0         ; PWM Period
SetupC1     mov.w   #OUTMOD_3,&TACCTL1      ; TACCR1 set/reset
            mov.w   #2047,&TACCR1           ; TACCR1 PWM Duty Cycle
SetupTA     mov.w   #TASSEL_1+MC_1,&TACTL   ; ACLK, up mode
                                            ;
Mainloop    bis.w   #LPM3+GIE,SR            ; Enter LPM3
            nop                             ; Required only for debugger
                                            ;
;-------------------------------------------------------------------------------
TA0_ISR;    ISR for TACCR0
;-------------------------------------------------------------------------------
            clr.w   &TACTL                  ; Clear Timer_A control registers
            bic.w   #LPM0,0(SP)             ; Exit LPM0 on reti
            reti                            ;
;-------------------------------------------------------------------------------
ADC10_ISR;
;-------------------------------------------------------------------------------
            bic.b   #01h,&P1OUT             ; P1.0 = 0
            cmp.w   #0155h,&ADC10MEM        ; ADC10MEM = A1 > 0.5V?
            jlo     ADC10_Exit              ; Again
            bis.b   #01h,&P1OUT             ; P1.0 = 1
ADC10_Exit  reti                            ;
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .sect   ".int05"                ; ADC10 Vector
            .short  ADC10_ISR               ;
            .sect   ".int09"                ; Timer_A0 Vector
            .short  TA0_ISR                 ;
            .end