initial commit
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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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; MSP430F20x3 Demo - SD16A Sequence of conversions
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; The SD16A takes a sample of a single sequence of channels: A0, A1, then A2.
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; Sampling begins with ch A0. The 4th conversion result of each channel is
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; stored in memory.
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;
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;
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; MSP430F20x3
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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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; Vin+ -->|A0+ P1.0 |
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; |A01- = VSS |
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; | |
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; Vin+ -->|A1+ P1.2 |
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; |A1- = VSS |
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; | |
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; Vin+ -->|A2+ P1.4 |
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; |A2- = VSS |
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; | |
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; | VREF |---+
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; | | |
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; | | -+- 100nF
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; | | -+-
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; | | |
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; | AVss |---+
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; | |
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;
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;
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; R. B. Elliott / H. Grewal
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; Texas Instruments
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; April 2007
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; Built with Code Composer Essentials V2.0
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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 0F800h ; Program Reset
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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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mov.b #DIVS_3, &BCSCTL2 ; SMCLK/8
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SetupSD16 mov.w #SD16REFON+SD16SSEL_1,&SD16CTL ; 1.2V ref, SMCLK
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mov.b #SD16INCH_0+SD16INTDLY_0,&SD16INCTL0 ; Set channel A0+/-
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mov.w #SD16UNI+SD16IE+SD16SNGL,&SD16CCTL0 ; 256OSR, unipolar,
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; enable interrupt,
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; single conversion
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mov.b #SD16AE0,&SD16AE ; P1.0 A0+, A0- = VSS
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mov.w #03600h, R4 ; Delay for 1.2V ref startup
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Delay dec.w R4;
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jne Delay;
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mov.w #0h, R5 ; R5 = ch_count
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;
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Mainloop bis.w #SD16SC,&SD16CCTL0 ; Start conversion
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bis.w #CPUOFF+GIE,SR ; CPU off, enable interrupts
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nop ; Required only for debugger
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jmp Mainloop ; jump back to mainloop
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;-------------------------------------------------------------------------------
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SD16_ISR;
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;-------------------------------------------------------------------------------
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cmp.w #01h, R5;
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jlo Case0 ; current channel is A0
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jeq Case1 ; current channel is A1
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jmp Case2 ; current channel is A2
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Case0 mov.w &SD16MEM0, R7 ; R7 = A0 conversion results
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inc.w R5 ; ch_counter++
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mov.b #SD16INCH_1,&SD16INCTL0 ; Enable channel A1+/-
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mov.b #SD16AE2, &SD16AE ; Enable external input on A1+
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jmp Done ; break
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Case1 mov.w &SD16MEM0, R8 ; R8 = A1 conversion results
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inc.w R5 ; ch_counter++
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mov.b #SD16INCH_2,&SD16INCTL0 ; Enable channel A2+/-
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mov.b #SD16AE4, &SD16AE ; Enable external input on A2+
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jmp Done ; break
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Case2 mov.w &SD16MEM0, R9 ; R9 = A2 conversion results
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mov.w #0h, R5 ; Reset channel count (end of seq)
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mov.b #SD16AE0, &SD16AE ; Reset external input to A0+/-
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mov.b #SD16INCH_0,&SD16INCTL0 ; Reset channel observed
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Done bic.w #LPM0,0(SP) ; Exit LPM0
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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 ".int07" ; SD16 Vector
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.short SD16_ISR ;
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.end
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