main.asm

;
; ATtiny25_AS__SPI_Master_BMx280_.asm
;
; Created: 28.06.2017 10:33:57
; Author : setup
;

; Important! 
; ATtiny DO -> BMx280 SDI (SDA, DI)
; ATtiny DI -> BMx280 SDO (DO)


.include "tn25def.inc"

.def dClock   = R12
.def dRate    = R13
.def cntHL    = R14
.def cntd     = R15
.def tmp      = R16
.def _EREG_   = R17
.def txByte   = R18
.def rxByte   = R19
.def tcntL    = R20
.def tcntH    = R21
.def tmpL     = R22
.def tmpH     = R23
.def cntLL    = R24
.def cntLH    = R25

.equ LEDDDR   = DDRB
.equ LEDPORT  = PORTB
.equ LEDPIN   = PINB
.equ LED0PIN  = PB3

.equ SPIDDR   = DDRB
.equ SPIPORT  = PORTB
.equ SPIPIN   = PINB
.equ DI       = PB0
.equ DO       = PB1
.equ SCK      = PB2
.equ SS_1     = PB4 ; CSB pin BMx280

;/******************************* Event REGistry *********************************/
.equ _MIF_    = 0 ; Timer Measure Interval Flag
.equ _SPIRWF_ = 1 ; SPI Read/Write Flag, 0 - write (m->s), 1 - read (m<-s)
.equ _SPIERF_ = 3 ; SPI ERror Flag

.cseg
.org 0


.include "./inc/vectors.inc"
.include "./inc/macroses.inc"
.include "./inc/init.inc"





;/*********************************** MAIN LOOP **********************************/
MAIN:
  sbrs _EREG_, _MIF_
  rjmp _GO_TO_SLEEP
  cbr _EREG_, (1<<_MIF_)
  rcall MAKE_MEASURE

  _RESTORE_TIMER:
    rcall CLEAR_TIMER
    rcall INIT_TIMER

  _GO_TO_SLEEP:
    in tmp, MCUCR
    sbr tmp, (1<<SE)
    out MCUCR, tmp
    sei
    sleep

  rjmp MAIN
  rjmp THE_END



.include "./inc/spi.inc"
.include "./inc/bmx280.inc"
.include "./inc/interrupts.inc"
.include "./inc/utils.inc"



;/*********************************** MEASURMENT *********************************/
MAKE_MEASURE:
  sbrc _EREG_, _SPIERF_
  rcall INIT_BMx280
  rcall BMx280_WRITE_F4 ; Datasheet 3.3.3 Forced mode. For a next measurement, forced mode needs to be selected again.
  BMx280_READ_MACRO BMx280_data, 0xf7, 0x06 ; Read data registers, count 0x08 for BME280 or 0x06 for BMP280
  ret


;/************************************ THE END ***********************************/
THE_END:
  cli
  rjmp 0


.include "./inc/var.inc"