71 lines
3.3 KiB
NASM
71 lines
3.3 KiB
NASM
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;-------------------------------------------------------------------------------
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; File: Lab6_D1.asm
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; Description: The program toggles LEDs periodically.
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; The LEDs are initialized off. An endless loop is entered.
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; A SWDelay1 loop creates 1s delay before toggling the LEDs.
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; LEDs will toggle: off for 1s and on for 1s.
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;
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; Clocks: ACLK = 32.768kHz, MCLK = SMCLK = default DCO = 2^20=1,048,576 Hz
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; Platform: TI Experimenter's Board
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;
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; MSP430xG461x
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; -----------------
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; /|\| |
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; | | |
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; --|RST |
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; | P2.2|-->LED1(GREEN)
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; | P2.1|-->LED2(YELLOW)
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;
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; Author: Aleksandar Milenkovic, milenkovic@computer.org
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; Date: September 14, 2018
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;-------------------------------------------------------------------------------
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.cdecls C,LIST,"msp430.h" ; Include device header file
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;-------------------------------------------------------------------------------
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.def RESET ; Export program entry-point to
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; make it known to linker.
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;-------------------------------------------------------------------------------
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.text ; Assemble into program memory.
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.retain ; Override ELF conditional linking
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; and retain current section.
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.retainrefs ; And retain any sections that have
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; references to current section.
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;-------------------------------------------------------------------------------
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RESET: mov.w #__STACK_END,SP ; Initialize stack pointer
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StopWDT: mov.w #WDTPW|WDTHOLD,&WDTCTL ; Stop watchdog timer
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Setup: bis.b #0x06,&P2DIR ; Set P2.2 and P2.1 to output
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; direction (0000_0110)
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bic.b #0x04,&P2OUT ; Set P2OUT to 0x0000_0100 (LEDS off)
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InfLoop: mov.w #0xFFFF, R5 ; Software delay (65,535*16cc/2^20 ~ 1s)
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SWDelay1: nop ; 1cc (total delay is 16 cc)
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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dec.w R5 ; 1cc
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jnz SWDelay1 ; 2cc
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xor.b #0x06, P2OUT ; toggle LEDs
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jmp InfLoop ; goto InfLoop
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;-------------------------------------------------------------------------------
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; Stack Pointer definition
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;-------------------------------------------------------------------------------
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.global __STACK_END
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.sect .stack
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;-------------------------------------------------------------------------------
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; Interrupt Vectors
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;-------------------------------------------------------------------------------
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.sect ".reset" ; MSP430 RESET Vector
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.short RESET
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