msp430x20x2_adc10_09.s43

MSP430F20xx的汇编程序示例

;*******************************************************************************
;   MSP430F20x2 Demo - ADC10, DTC Sample A10 32x, 1.5V, Repeat Single, DCO
;
;   Description: Use DTC to sample A10 32 times with reference to internal 1.5v.
;   Vref Software writes to ADC10SC to trigger sample burst. In Mainloop MSP430
;   waits in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC)
;   will force exit from any LPMx in Mainloop on reti. (ADC10OSC/4)/64
;   determines sample time which needs to be greater than 30us for temperature
;   sensor. DTC transfers conversion code to RAM 200h - 240h. P1.0 set at start
;   of conversion burst, reset oncompletion. Temperature sensor offset and slope
;   will vary from device to device per datasheet tolerance.
;
;                MSP430F20x2
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |A10          P1.0|-->LED
;
;   L. Westlund
;   Texas Instruments Inc.
;   May 2006
;   Built with IAR Embedded Workbench Version: 3.41A
;*******************************************************************************
#include "msp430x20x2.h"
;-------------------------------------------------------------------------------
            RSEG    CSTACK                  ; Define stack segment
;-------------------------------------------------------------------------------
            RSEG    CODE                    ; Assemble to Flash memory
;-------------------------------------------------------------------------------
RESET       mov.w   #SFE(CSTACK),SP         ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupADC10  mov.w   #INCH_10+ADC10DIV_3+CONSEQ_2,&ADC10CTL1 ;
            mov.w   #SREF_1+ADC10SHT_3+MSC+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
            mov.b   #020h,&ADC10DTC1        ; 32 conversions
SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output
                                            ;
Mainloop    bic.w   #ENC,&ADC10CTL0         ;
busy_test   bit     #BUSY,&ADC10CTL1        ; ADC10 core inactive?
            jnz     busy_test               ;
            mov.w   #0200h,&ADC10SA         ; Data buffer start
            bis.b   #001h,&P1OUT            ; P1.0 =1
            bis.w   #ENC+ADC10SC,&ADC10CTL0 ; Start sampling
            bis.w   #CPUOFF+GIE,SR          ; LPM0, ADC10_ISR will force exit
            bic.b   #001h,&P1OUT            ; P1.0 = 0
            jmp     Mainloop                ; Again
                                            ;
;-------------------------------------------------------------------------------
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;  Exit LPM0 on reti
;-------------------------------------------------------------------------------
            bic.w   #CPUOFF,0(SP)           ; Exit LPM0 on reti
            reti                            ;
                                            ;
;-------------------------------------------------------------------------------
            COMMON  INTVEC                  ; Interrupt Vectors
;-------------------------------------------------------------------------------
            ORG     ADC10_VECTOR            ; ADC10 Vector
            DW      ADC10_ISR
            ORG     TIMERA0_VECTOR          ; Timer_A0 Vector
            DW      TA0_ISR
            ORG     RESET_VECTOR            ; POR, ext. Reset
            DW      RESET
            END