dcmotor.s43

msp430单片机部分代码,,,msp430单片机部分代码

;******************************************************************************
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#include          "msp430x11x1.h" ; Standard Equations

NAME  DCmotorspeedcontroller
;******************************************************************************
;    
;    Murugavel Raju
;    Texas Instruments, Inc
;    
;******************************************************************************
;CPU registers used
;******************************************************************************

#define    Duty_cycle   R6                

;******************************************************************************
;Constants
;******************************************************************************
PWM_OUT    equ    004h                    ; bit2 of Port1 / TA1  
Period     equ    0ffh                    ; Counts for D/A, 8bits = 256 
;******************************************************************************
;
;******************************************************************************
           RSEG  CSTACK
           DS    0           
;****************************************************************************** 
           RSEG CODE
;****************************************************************************** 

RESET      mov     #SFE(CSTACK),SP         ; define stackpointer
           call    #Init_Sys               ; Initialize            

Mainloop   bit.b   #BIT0,&P2IN             ; check if 'decrease' button pressed      
           jz      Next1
           
           bit.b   #BIT1,&P2IN             ; check if 'increase' button pressed
           jz      Next2
           
           jmp     Mainloop                ; loop if no button pressed 

Next1      cmp     #0,Duty_cycle           ; check if PWM = 0
           jz      Mainloop                ; repeat loop
           dec     Duty_cycle              ; increment the PWM by one step           
           jmp     SendPWM         
           
Next2      cmp     #0ffh,Duty_cycle        ; check if 256 steps are done
           jz      Mainloop                ; Repeat for next cycle
           inc     Duty_cycle              ; increment the PWM by one step
                      
SendPWM    mov     Duty_cycle,&CCR1        ; Send value to PWM output
           call    #Delay                  ; insert a small delay between key polling
           jmp     Mainloop                ; repeat loop
                                            
;******************************************************************************
Init_Sys;  Modules and Controls Registers set-up subroutine
;******************************************************************************
StopWDT    mov     #WDTPW+WDTHOLD,&WDTCTL  ; Stop Watchdog Timer

SetupBC    mov.b   #XTOFF+RSEL2+RSEL1+RSEL0,&BCSCTL1   
                                           ; RSEL=7
           mov.b   #0ffh,&DCOCTL           ; DCO selected for highest freq.                                            
                                                                                                           
SetupP1    mov.b   #0,&P1OUT               ; P1OUT reset
           bis.b   #PWM_OUT,&P1SEL         ; P1.2/TA1 for PWM OUT                
           bis.b   #0ffh,P1DIR             ; P1.2 output for PWM OUT and remaining unused

SetupP2    mov.b   #03ch,&P2DIR            ; P2.0,P2.1 as inputs,P2.2 to P2.5 outputs(unused) 
           
           mov     #Period,&CCR0           ; Set Period length for PWM output  
           mov     #0,&CCR1                ; Initial PWM value for output
           mov     #OUTMOD_7,&CCTL1        ; Set output mode 7 for TA1
SetupTA    mov     #TASSEL1+MC0,&TACTL     ; Set TimerA Up mode, SMCLK as TACLK
           
           mov     #0,Duty_cycle           ; reset Duty_cycle buffer
           ret                             ; Return from subroutine
                                            

;******************************************************************************
Delay;     Software delay
;******************************************************************************
           push    #03FFFh                 ; Delay to TOS
L1         dec     0(SP)                   ; Decrement TOS
           jnz     L1                      ; Delay over?
           incd    SP                      ; Clean TOS
           ret                             ; Return from subroutine
                                                     

;****************************************************************************** 
             COMMON  INTVEC                 ; MSP430F1xx Interrupt vectors             
;******************************************************************************               
             ORG     RESET_VECTOR
RESET_VEC    DW      RESET                  ; POR, ext. Reset, Watchdog

             END