26 lines
1.1 KiB
NASM
26 lines
1.1 KiB
NASM
.include "msp430g2553.inc"
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org 0x0C000
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RESET:
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mov.w #0x400, SP
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mov.w #WDTPW|WDTHOLD, &WDTCTL
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mov.b #11110111b, &P1DIR ; all pins outputs except P1.3
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mov.b #00001000b, &P1REN ; enable resistor pull for P1.3
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mov.b #00001000b, &P1IE ; P1.3 set as an interrupt
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mov.b #00001000b, R7 ; set LEDs off and P1.3 pullup
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mov.b R7, &P1OUT ; LED1, LED2 on
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mov.b #00000001b, R8 ; initial value to xor with R7
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EINT ; enable interrupts
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bis.w #CPUOFF, SR
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PUSH:
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xor.b R8, R7 ; next LED state
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xor.b #01000000b, R8 ; 0x0041 -> 0x0001 -> 0x0041
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mov.b R7, &P1OUT ; set LEDs to new state
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bic.b #00001000b, &P1IFG ; interrupt flag P1.3 set to 0
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reti ; return from interrupt
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org 0xffe4
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dw PUSH ; interrupt from button goes here
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org 0xfffe
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dw RESET ; interrupt from reset button goes here |