ATmega168 7-Segmentni Display

[ronovar]

Postavio sam SPI: (PORTB.3 CS, PORTB.4 SO, PORTB.5 SCK)

; DDRB - Segment Multiplexing Output (0, 1, 2) | MAX6675 CS(MOSI), SCK(SCK) Output, SO(MISO) Input (3 5 4)

ldi R16, (1<<0)|(1<<1)|(1<<2)|(1<<3)|(1<<5)
out DDRB, R16

; Spi Init - ReadTemperature

ldi R16, (1<<SPE)|(1<<MSTR)|(1<<SPR0) ; Spi Master, Prescaler fck/16
out SPCR, R16

I glavni program koji se vrti u loop i cita temperaturu:

Loop:

   ; Read MAX6675 ThermoCouple Temperature
   cbi PORTB,3 ; CS Low
   out SPDR, R20 ; Start Reading Data
Read_Temp:
   in R20, SPSR ; Read Data
   sbrs R20, SPIF
   rjmp Read_Temp
rjmp Loop


Dakle prema datasheetu:

https://datasheets.maximintegrated.com/e...AX6675.pdf

kako da ocitam iz SO outputa (SPIF registar mi ima tu vrijednost) tih 12-bita temperature i thermocouple input vrijednost? Citao sam da trebam bit shifting left raditi pa mi nije to bas jasno....