fet140_dma_05.s43

基于IAR Workbench for MSP430 的汇编语言例程

;******************************************************************************
;   MSP-FET430P140 Demo - DMA0 Repeated Block to DAC0 Sine Output, CCR2, DCO
;
;   Description; DMA0 is used to transfer a sine look-up table word-by-word 
;   as a repeating block to DAC12_0. The effect is sine wave output. Timer_A 
;   operates in upmode with CCR2 loading DAC12_0 on rising edge and DAC12_0IFG
;   triggering next DMA1 transfer. DAC12_0 uses internal 1.5V reference.
;   ACLK = n/a, MCLK = SMCLK = TACLK = default DCO ~ 800k
;   //* MSP430F169 Device Required*//
;
;                MSP430F169             
;             -----------------
;         /|\|              XIN|-  
;          | |                 |    
;          --|RST          XOUT|-       
;            |                 |
;            |        DAC0/P6.6|--> ~ 1kHz sine wave
;            |                 | 
;
;
;   M.Buccini
;   Texas Instruments, Inc
;   January 2004
;******************************************************************************
#include  "msp430x16x.h"
;------------------------------------------------------------------------------ 
            ORG     01100h                  ; Progam Start 
;------------------------------------------------------------------------------ 
RESET       mov.w   #0A00h,SP               ; Initialize 'x1x9 stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop watchdog timer
SetupADC12  mov.w   #REFON,&ADC12CTL0       ; Internal reference 
SetupDMA0   mov.w   #Sin_tab,&DMA0SA        ; Source block address
            mov.w   #DAC12_0DAT,&DMA0DA     ; Destination single address
            mov.w   #020h,&DMA0SZ           ; Block size
            mov.w   #DMA0TSEL_5,&DMACTL0    ; DAC12IFG trigger
            mov.w   #DMADT_4+DMASRCINCR_3+DMAEN,&DMA0CTL; Rpt, inc src, word-word 
SetupDAC120 mov.w   #DAC12LSEL_2+DAC12IR+DAC12AMP_5+DAC12IFG+DAC12ENC,&DAC12_0CTL
SetupC1     mov.w   #OUTMOD_3,&CCTL1        ; CCR1 set/reset
            mov.w   #01,&CCR1               ; CCR1 PWM Duty Cycle	  
SetupC0     mov.w   #025-1,&CCR0            ; Clock period of CCR0 
SetupTA     mov.w   #TASSEL_2+MC_1,&TACTL   ; SMCLK, contmode
                                            ;
Mainloop    bis.b   #CPUOFF,SR              ; Enter LPM0
            nop                             ; Needed only for debugger
                                            ;
;------------------------------------------------------------------------------ 
; 12-bit Sine Lookup table with 32 steps
;------------------------------------------------------------------------------ 
Sin_tab     DW 2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056
            DW 4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447 
            DW 2048, 1648, 1264,  910,  600,  345,  156,   39 
            DW    0,   39,  156,  345,  600,  910, 1264, 1648 
;
;------------------------------------------------------------------------------ 
;           Interrupt Vectors Used MSP430x15x/16x         
;------------------------------------------------------------------------------ 
             ORG     0FFFEh                  ; POR, ext. Reset, Watchdog, Flash
             DW      RESET                   ; 
             END