fet140_adc12_06.s43

基于IAR Workbench for MSP430 的汇编语言例程

;******************************************************************************
;   MSP-FET430P140 Demo - ADC12, Repeated Sequence of Conversions
;
;   Description: This program will show how to perform a repeated sequence of
;                conversions using the "repeat sequence-of-channels" mode.
;
;   This example shows how to perform a repeated sequence of conversions using 
;   "repeat sequence-of-channels" mode.  AVcc is used for the reference and 
;   repeated sequence of conversions is performed on Channels A0, A1, A2, and 
;   A3. Each conversion result is stored in ADC12MEM0, ADC12MEM1, ADC12MEM2, 
;   and ADC12MEM3 respectively. After each sequence, the 4 conversion results 
;   are moved to ram locations.  The conversion results for channel A0 are
;   moved to ram addresses 0x200 - 0x20E, A1 results are moved to addresses
;   0x210 - 0x21E, A2 results are moved to addresses 0x220 - 0x22E, and A3 
;   results are moved to 0x230 - 0x23E. Test by applying voltages to channels 
;   A0 - A3. Open a memory window in C-Spy and view the memory contents at the 
;   above locations after stopping program execution. Remember the conversion 
;   results are 12-bits so you must set the memory window to 16-bit mode.
;
;   Note that a sequence has no restrictions on which channels are converted. 
;   For example, a valid sequence could be A0, A3, A2, A4, A2, A1, A0, and A7.
;   See the MSP430x1xx User's Guide for instructions on using the ADC12.
;
;   *Note*  This example only functions on MSP production silicon, not PMS
;   pre-production silicon.  Production silicon will be noted on the chip as 
;   "M430F149" whereas pre-production silicon will be marked "P430F149."
;
;
;                MSP430F149
;            -----------------
;           |                 |
;           |              A0 |<---- Vin0
;           |              A1 |<---- Vin1
;           |              A2 |<---- Vin2
;           |              A3 |<---- Vin3
;           |                 |
;
;
;   M.Mitchell
;   Texas Instruments, Inc
;   January 2004
;******************************************************************************
#include          "msp430x14x.h" // Standard Equations

A0result      EQU     0200h                 ; Channel A0 results
A1result      EQU     0210H                 ; Channel A1 results
A2result      EQU     0220H                 ; Channel A2 results
A3result      EQU     0230H                 ; Channel A3 results
                                            ;
;------------------------------------------------------------------------------ 
main        ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------ 
RESET       mov     #0A00h,SP               ; Initialize stackpointer
StopWDT     mov     #WDTPW+WDTHOLD,&WDTCTL  ; Stop watchdog
            bis.b   #BIT0+BIT1+BIT2+BIT3,&P6SEL ; Enable A/D inputs
                                            ;
SetupADC12  mov     #SHT0_8+MSC+ADC12ON,&ADC12CTL0 
                                            ; Turn on ADC12, use int. osc.
                                            ; extend sampling time so won't
                                            ; get overflow
                                            ; Set MSC so conversions triggered
                                            ; automatically
            mov     #SHP+CONSEQ_3,&ADC12CTL1  
                                            ; Use sampling timer, set mode
            mov     #BIT3,&ADC12IE          ; Enable ADC12IFG.3 for ADC12MEM3
            mov.b   #INCH_0,ADC12MCTL0      ; A0 goes to MEM0
            mov.b   #INCH_1,ADC12MCTL1      ; A1 goes to MEM1
            mov.b   #INCH_2,ADC12MCTL2      ; A2 goes to MEM2
            mov.b   #EOS+INCH_3,ADC12MCTL3  ; A3 goes to MEM3, end of sequence
                                            ;
            clr     R5                      ; Clear pointer
            eint                            ; Enable interrupts
                                            ;
Mainloop    bis     #ENC,&ADC12CTL0         ; Enable conversions
            bis     #ADC12SC,&ADC12CTL0     ; Start conversions
            bis     #CPUOFF,SR              ; Hold in LPM0 
                    nop                     ; Need only for C-SPY
                                            ;           
;------------------------------------------------------------------------------ 
ADC12ISR    ; Interrupt Service Routine for ADC12
;------------------------------------------------------------------------------
            mov     &ADC12MEM0,A0result(R5) ; Move results to RAM
            mov     &ADC12MEM1,A1result(R5) ; Move results to RAM
            mov     &ADC12MEM2,A2result(R5) ; Move results to RAM
            mov     &ADC12MEM3,A3result(R5) ; Move results to RAM, IFG reset
            incd    R5                      ; Increment results table pointer
            and     #0Eh,R5                 ; Modulo pointer
            reti            
;------------------------------------------------------------------------------ 
;           Interrupt Vectors        
;------------------------------------------------------------------------------
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ;
            ORG     0FFEEh                  ; ADC12 Interrupt Vector
            DW      ADC12ISR                ;
            END