fet140_dma_01.s43

基于IAR Workbench for MSP430 的汇编语言例程

;******************************************************************************
;   MSP-FET430P140 Demo - DMA0 Repeated Burst to-from RAM, Software Trigger
;
;   Description; A 16 word block from 220h-240h is transfered to 240h-260h
;   using DMA0 in a burst block using software DMAREQ trigger.
;   After each transfer, source, destination and DMA size are 
;   reset to inital software setting because DMA transfer mode 5 is used. 
;   P1.0 is toggled durring DMA transfer only for demonstration purposes.
;   ** RAM location 0x220 - 0x260 used - always make sure no compiler conflict **
;   ACLK = n/a, MCLK = SMCLK = default DCO ~ 800k
;   //* MSP430F169 Device Required*//
;
;                MSP430F169
;             -----------------
;         /|\|              XIN|-  
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;   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 WDT
SetupP1     bis.b   #001h,&P1DIR            ; P1.0  output
            mov.w   #0220h,&DMA0SA          ; Start block address
            mov.w   #0240h,&DMA0DA          ; Destination block address
            mov.w   #0010h,&DMA0SZ          ; Block size
            mov.w   #DMADT_5+DMASRCINCR_3+DMADSTINCR_3+DMAEN,&DMA0CTL; Rpt, inc
            bis.w   #DMAEN,&DMA0CTL         ; Enable DMA0
                                            ;                                                     
Mainloop    bis.b   #01h,&P1OUT             ; P1.0 = 1, LED on
            bis.w   #DMAREQ,&DMA0CTL        ; Trigger block transfer
            bic.b   #01h,&P1OUT             ; P1.0 = 0, LED off
            jmp     Mainloop                ; Again
                                            ;
;------------------------------------------------------------------------------ 
;           Interrupt Vectors Used MSP430x15x/16x         
;------------------------------------------------------------------------------ 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            END