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Cameron
2018-03-18 00:56:37 -04:00
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content/dxp_Lab5_a1.asm Normal file
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;*******************************************************************************
; MSP430 Assembler Code Template for use with TI Code Composer Studio
; dxp_Lab5_a1.asm
; Displays a clockwise circle
; dbp 0301_365_20053
; Built with CCE for MSP430 Version: 1.00
; Updated for version 4.x.x by Dorin Patru April 2011
; Re-coded completely for CCS v5.4, Launch Pad and Capacitive Booster Pack
; by Dorin Patru October 2013
;*******************************************************************************
;-------------------------------------------------------------------------------
.cdecls C,LIST,"msp430g2553.h" ; Include device header file
;-------------------------------------------------------------------------------
; .data ; presume .data begins at 0x0200
SPEED: .word 0x7fff ; display half speed
;-------------------------------------------------------------------------------
.text ; Assemble into program memory
.retain ; Override ELF conditional linking
; and retain current section
.retainrefs ; Additionally retain any sections
; that have references to current
; section
;-------------------------------------------------------------------------------
RESET mov.w #__STACK_END,SP ; Initialize stackpointer
StopWDT mov.w #WDTPW|WDTHOLD,&WDTCTL ; Stop watchdog timer
;-------------------------------------------------------------------------------
; Main loop here
;-------------------------------------------------------------------------------
clr r10 ; delay counter
clr r11 ; LED select
bic.b #0xff,&P1DIR ; set up P1 as input
bis.b #0xf8,&P1DIR ; set up P1[7:3] as outputs
;-------------------------------------------------------------------------------
; LEDs 4-1 not elegant display
;-------------------------------------------------------------------------------
CIRCLE: bic.b #0xf8,&P1OUT ; prepare to display LEDs 1-4
bis.b #0x80, &P1OUT ; turn on LED4
call #DELAY ; wait around
bic.b #0x80, &P1OUT ; turn off LED4
bis.b #0x40, &P1OUT ; turn on LED3
call #DELAY ; wait around
bic.b #0x40, &P1OUT ; turn off LED3
bis.b #0x20, &P1OUT ; turn on LED2
call #DELAY ; wait around
bic.b #0x20, &P1OUT ; turn off LED2
bis.b #0x10, &P1OUT ; turn on LED1
call #DELAY ; wait around
bic.b #0x10, &P1OUT ; turn off LED1
;-------------------------------------------------------------------------------
; LEDs 5-8 display loop
;-------------------------------------------------------------------------------
bic.b #0xf8,&P1OUT ; turn out all LEDs
bis.b #0xf8,&P1OUT ; prepare to display LEDs 5-8
mov.b #0x08, r11 ; prepare r11 for the loop
clrc ; clear carry
DISP_LOOP rla.b r11 ;
jc CIRCLE ; check if you need to display another LED
bic.b r11, &P1OUT ; turn on LEDs 5-8
call #DELAY ; wait around
jmp DISP_LOOP ; jump to display the next LED
jmp CIRCLE ; circle again
;-------------------------------------------------------------------------------
; Delay Subroutine
;-------------------------------------------------------------------------------
DELAY: mov.w &SPEED,R10
MORE_DELAY: dec.w R10 ; Decrement R10
jnz MORE_DELAY ; Delay over?
ret ; return
;-------------------------------------------------------------------------------
; Stack Pointer definition
;-------------------------------------------------------------------------------
.global __STACK_END
.sect .stack
;-------------------------------------------------------------------------------
; Interrupt Vectors
;-------------------------------------------------------------------------------
.sect ".reset" ; MSP430 RESET Vector
.short RESET