fet440_adc12_08.s43

msp430f440的头程序

#include          "msp430x44x.h" // Standard Equations
;******************************************************************************
;   MSP-FET430P440 Demo - ADC12, Sequence of Conversions (non-repeated)
;
;   Description: This program will show how to convert a non-repeated sequence
;                of channels.
;               
;   This example shows how to perform A/D conversions on a sequence of channels.
;   A single sequence of conversions is performed - one conversion each on 
;   channels A0, A1, A2, and A3. Each conversion uses AVcc and AVss for the 
;   references. The conversion results are stored in ADC12MEM0, ADC12MEM1,
;   ADC12MEM2, and ADC12MEM3 respectively and are moved to R5, R6, R7, and R8
;   respectively after the sequence is complete. Test by applying voltages to 
;   pins A0, A1, A2, and A3, then setting and running to a break point at 
;   "jmp Mainloop."  To view the conversion results, open a register window in 
;   C-Spy and view the contents of R5, R6, R7, and R8.
;
;   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 MSP430x4xx User's Guide for instructions on using the ADC12.
;
;
;
;                MSP430F449
;            -----------------
;           |                 |
;           |              A0 |<---- Vin0
;           |              A1 |<---- Vin1
;           |              A2 |<---- Vin2
;           |              A3 |<---- Vin3
;           |                 |
;
;
;       M.Mitchell
;       Texas Instruments, Inc
;       January, 2002
;******************************************************************************
;------------------------------------------------------------------------------ 
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 channel inputs
                                             ;
SetupADC12  mov     #ADC12ON+MSC+SHT0_2,&ADC12CTL0 ; Turn on ADC12, set MSC
            mov     #SHP+CONSEQ_1,&ADC12CTL1 ; Use samp. timer, single sequence
            bis.b   #INCH_0,&ADC12MCTL0      ; AVcc=ref+, channel=A0
            bis.b   #INCH_1,&ADC12MCTL1      ; AVcc=ref+, channel=A1
            bis.b   #INCH_2,&ADC12MCTL2      ; AVcc=ref+, channel=A2
            bis.b   #INCH_3+EOS,&ADC12MCTL3  ; AVcc=ref+, channel=A3, end seq.
                                             ;
            mov     #BIT3,&ADC12IE           ; Enable ADC12IFG.0 for ADC12MEM0
            bis     #ENC,&ADC12CTL0          ; Enable conversions
            eint                             ; Enable interrupts
                                             ;            
Mainloop    bis     #ADC12SC,&ADC12CTL0      ; Start conversions
            bis     #CPUOFF,SR               ; Wait in LPM0 for seq to complete
                                             ;
            nop                              ; Only Required for CSPY
            jmp     Mainloop                 ; SET BREAKPOINT HERE
                                             ;
;------------------------------------------------------------------------------ 
ADC12ISR    ; Interrupt Service Routine for ADC12
;------------------------------------------------------------------------------
            bic    #CPUOFF,0(SP)
            mov     &ADC12MEM0,R5            ; Move A0 result
            mov     &ADC12MEM1,R6            ; Move A1 result
            mov     &ADC12MEM2,R7            ; Move A2 result
            mov     &ADC12MEM3,R8            ; Move A3 result, IFG is reset
            reti                             ;
                                             ;
;------------------------------------------------------------------------------ 
;           Interrupt Vectors        
;------------------------------------------------------------------------------
            ORG     0FFFEh                   ; MSP430 RESET Vector
            DW      RESET                    ;
            ORG     0FFEEh                   ; ADC12 Interrupt Vector
            DW      ADC12ISR                 ;
            END