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101 lines
2.0 KiB
101 lines
2.0 KiB
10 years ago
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.device attiny13
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.def cnt=r17
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.def P0=r20
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.def chc=r18
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.def faze=r19
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;### NASTAVENI ###
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.equ CChDelay=8 ;DELAY pro zmenu barev - cim min tim rychlejsi je zmena
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.equ TIMEROV=2 ;porovnavaci hodnota pro timer - konstanta
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.org 0x0000 ;RESET
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rjmp RESET ;skok na start po resetu
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.org 0x0006 ;TC0 overflow
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rjmp CASOVAC
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.org 0x0007
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rjmp casovac
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.org 0x0010
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RESET:
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ldi r16,low(RAMEND) ;nastavi stack pointer
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out SPL,r16
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cli ;zakazat vsechna preruseni
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ldi r16,0b00011111 ;výstupní = 1
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out DDRB,r16
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ldi r16,0 ;vypnout PullUp
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out PORTB,r16
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ldi r16,0b00000001 ;TC0 prescaler na 1 - velice plynule, bez blikani
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out TCCR0B,r16 ;4800000Hz
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ldi r16,0b00000010 ;TC0 je v rezimu CTC
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out TCCR0A,r16
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ldi r16,TIMEROV ;overflow 32 clks - upravuje rychlost prepinani (konstanta)
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out OCR0A,r16 ;
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in r16, TIMSK0 ;interrupt enable
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ori r16, 0b00000100
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out timsk0,r16
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ldi P0,0 ;0
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clr cnt
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clr chc
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clr faze ;faze: 0 = nahoru 1=dolu
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sei ;zapnout globalne interrupt
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LOOP:
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rjmp LOOP ;skok na loop
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CASOVAC:
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inc cnt ;cnt=cnt+1
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cpi cnt,128 ;cnt==128? ANO->pokracovat, NE->skok na NOV
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brne nov
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clr cnt ;CNT je 128 -> vymazat CNT
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;vynulovat LED kanaly:
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cbi portb,0 ; (0)
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cbi portb,1 ; (1)
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cbi portb,2 ; (2)
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cbi portb,3 ; (3)
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cbi portb,4 ; (4)
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inc chc ;Zvysime citac pro zmenu barvy CHC o 1
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cpi chc,CChDelay ;CHC==delay? ANO->pokracovat, NE->skok na NOV
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brne nov
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clr chc ;MENI SE BARVY
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cpi faze,0
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brne FazeNot0
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;FAZE je 0
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inc P0
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cpi P0,85
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brne nov
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inc faze
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FazeNot0:
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;FAZE je 1
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dec P0
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cpi P0,0
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brne nov
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clr faze
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;sprava PWM kanalu - podminene zapnuti LED
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nov: ;NOV label
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cp cnt,P0 ;P0==CNT? ANO->zapni P0, NE->skok na NOT0
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brne endcounter
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sbi portb,0
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sbi portb,1
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sbi portb,2
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sbi portb,3
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sbi portb,4
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endcounter: ;ENDCOUNTER label - konec preruseni
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reti ;navrat z obsluhy preruseni
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