Problemet yttrar sig som så att jag bara får udda siffror i minuter och sekunder. Tiosekunder går bra. Tiominuter går inte så bra. Timmar hag jag inte kollat än (vafan, det tar ju en timme!
). I mina öron låter det som att en bit på ett eller annat vis faller bort. Här är hela koden till min Nixie-klocka. Har inga direkta förbehållningar men om nu använder den eller delar av den vill jag gärna veta det. Om inte annat så för skojs skull
.Kod: Markera allt
.include "8515def.inc"
.org $0000
rjmp reset
.org ovf0ADDR
rjmp sweep
.def temp=r16
.def rtcdat=r17
.def cnt=r18
.def tim1=r19
.def tim2=r20
;initiera stackpekaren
ldi temp, HIGH(RAMEND)
out SPH, temp
ldi temp, LOW(RAMEND)
out SPL, temp
reset:
;initiera stackpekaren
ldi temp, HIGH(RAMEND)
out SPH, temp
ldi temp, LOW(RAMEND)
out SPL, temp
;Sätt upp portar
ser temp
out ddra, temp
out ddrb, temp
out ddrc, temp
ldi temp, 0b11111000
out ddrd, temp
;initiera interrupts
ldi temp, 0b00000010
out timsk, temp
; sei
;initiera timer0
ldi temp, 0b00000010
out tccr0, temp
;Sätt igång RTC
;ldi rtcdat, 0b10000000
;sbi PORTD, PIND7
;rcall txrtc
;ldi rtcdat, 0b00000000
;rcall txrtc
;cbi PORTD, PIND7
;sei
main:
;sbis PIND, 0
;rjmp settime
rcall sweep
rjmp main
Sweep:
clr tim1
clr tim2
sbi ddrd, 6
ldi rtcdat, 0b10000001
sbi PORTD, PIND7
rcall txrtc
cbi ddrd, 6
;rcall delay
clr rtcdat
rcall rxrtc
cbi PORTD, PIND7
out porta, rtcdat
sbi PORTD, PIND7
sbi ddrd, 6
ldi rtcdat, 0b10000011
;rcall delay
rcall txrtc
cbi ddrd, 6
;rcall delay
clr rtcdat
rcall rxrtc
cbi PORTD, PIND7
out portb, rtcdat
sbi PORTD, PIND7
sbi ddrd, 6
ldi rtcdat, 0b10000101
;rcall delay
rcall txrtc
cbi ddrd, 6
;rcall delay
clr rtcdat
rcall rxrtc
;rcall delay
cbi PORTD, PIND7
out portc, rtcdat
ret
inccnt:
push temp
in temp, sreg
push temp
inc tim1
cpi tim1, 90
brne return
clr tim1
inc tim2
cpi tim2, 10
brne return
rcall sweep
rjmp return
return:
pop temp
out sreg, temp
pop temp
reti
settime:
rjmp settime
Delay:
dec temp
brne delay
ret
;****************************************************************************
;'txrtc'
;Aim
; Function to write a byte to rtc. Value to be written is passed from
; calling function in register rtcdat.
;Registers used
; cnt to store no of bits
; rtcdat to store the data
;Functions called
; none
;*****************************************************************************
txrtc: ldi cnt, $08 ; load counter
txbck: ror rtcdat ; rotate data right through carry
cbi PORTD,PIND5 ; clear SCLK
brcc txnxt ; if carry set
sbi PORTD,PIND6 ; set I/O
rjmp txnxt1 ; else
txnxt: cbi PORTD,PIND6 ; clear I/O
txnxt1: sbi PORTD,PIND5 ; set SCLK
dec cnt ; decrement counter
brne txbck ; if counter not zero, go back
nop
cbi PORTD,PIND5 ; clear SCLK
ret
;******************************************************************************
;'rxrtc'
;Aim
; Function to read a byte from rtc. Value read is returned in register
; rtcdat
;Registers used
; cnt to store no of bits
; rtcdat to store the data read
;Functions called
; none
;*****************************************************************************
rxrtc: ldi cnt,$08 ; load counter
ldi rtcdat,0
rxbck: sbi PORTD,PIND5 ; set SCLK
sbic PIND,PIND6 ; if I/O set then
sec ; set carry
sbis PIND,PINB6 ; else
clc ; clear carry
ror rtcdat
cbi PORTD,PIND5 ; clear SCLK
dec cnt ; decrement counter
brne rxbck ; if counter equals zero, goto calling function
ret ; else jump back
Edit: Nej jag använder inte interrupts just nu. Skulle se hur det fungerar att fråga RTCn hela tiden om uppdateringar.
