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-> mapping to an 1/x like behaviour
[my-code/atmel.git]
/
beginners
/
m128_tests.asm
1
.include "../include/m128def.inc"
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; interrupt vectors
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5
jmp RESET
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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jmp _INT4
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jmp _INT5
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jmp _INT6
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jmp _INT7
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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reti
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nop
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RESET:
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; init
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; set stackpointer
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ldi r17,high(RAMEND)
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out SPH,r17
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ldi r17,low(RAMEND)
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out SPL,r17
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; uart
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ldi r17,(1<<TXEN0)
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out UCSR0B,r17
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ldi r17,(1<<UCSZ01|1<<UCSZ00)
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sts UCSR0C,r17
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ldi r17,0
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sts UBRR0H,r17
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ldi r17,25
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out UBRR0L,r17
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; switches
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ldi r17,(1<<PE4)|(1<<PE5)|(1<<PE6)|(1<<PE7)
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out PORTE,r17
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ldi r17,(1<<ISC41)|(1<<ISC51)|(1<<ISC61)|(1<<ISC71)
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out EICRB,r17
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ldi r17,(1<<INT4)|(1<<INT5)|(1<<INT6)|(1<<INT7)
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out EIMSK,r17
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; misc
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ldi r21,5
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ldi r18,0x34
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; enable interrupts
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sei
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; loop
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MAIN:
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UART_T:
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sbis UCSR0A,UDRE0
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rjmp UART_T
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out UDR0,r18
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rjmp MAIN
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_INT4:
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inc r18
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ldi r23,0
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WAIT_1:
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ldi r24,0
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WAIT_2:
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ldi r25,0
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WAIT_3:
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inc r25
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cpi r25,0xff
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brne WAIT_3
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inc r24
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cpi r24,0xff
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brne WAIT_2
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inc r23
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cpi r23,0xff
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brne WAIT_1
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reti
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_INT5:
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dec r18
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reti
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_INT6:
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add r18,r21
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reti
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_INT7:
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subi r18,5
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reti
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