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  ;;
  ;;  mur.sat
  ;;
  ;;  Somewhen in the year 2011, mur.at will have a nano satellite launched
  ;;  into a low earth orbit (310 km above the surface of our planet). The
  ;;  satellite itself is a TubeSat personal satellite kit, developed and
  ;;  launched by interorbital systems. mur.sat is a joint venture of mur.at,
  ;;  ESC im Labor and realraum.
  ;;
  ;;  Please visit the project hompage at sat.mur.at for further information.
  ;; 
  ;;
  ;;  Copyright (C) 2011 Christian Pointner <equinox@mur.at>
  ;;                         
  ;;  This file is part of mur.sat.
  ;;
  ;;  mur.sat is free software: you can redistribute it and/or modify
  ;;  it under the terms of the GNU General Public License as published by
  ;;  the Free Software Foundation, either version 3 of the License, or
  ;;  any later version.
  ;;
  ;;  mur.sat is distributed in the hope that it will be useful,
  ;;  but WITHOUT ANY WARRANTY; without even the implied warranty of
  ;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ;;  GNU General Public License for more details.
  ;;
  ;;  You should have received a copy of the GNU General Public License
  ;;  along with mur.sat. If not, see <http://www.gnu.org/licenses/>.
  ;;
  ;; -------------------------------------
  ;; DEFINES
  ;;   constants
TEMP_CMD_R_TEMP  EQU H'AA'
TEMP_CMD_START   EQU H'EE'
TEMP_CMD_STOP    EQU H'22'
TEMP_CMD_W_TH    EQU H'01'
TEMP_CMD_W_TL    EQU H'02'
TEMP_CMD_R_TH    EQU H'A1'
TEMP_CMD_R_TL    EQU H'A2'
TEMP_CMD_W_STAT  EQU H'0C'
TEMP_CMD_R_STAT  EQU H'AC'
TEMP_CMD_R_CNT   EQU H'A0'
TEMP_CMD_L_CNT   EQU H'41'

  ;; -------------------------------------
owire_presence
  bsf       STATUS,RP0
  bcf       TRISA,OWIRE
  movlw     .161
  movwf     OWIRE_CNT
owire_presence_loop
  decfsz    OWIRE_CNT,f
  goto      owire_presence_loop
  bsf       TRISA,OWIRE
  bcf       STATUS,RP0
  movlw     .21
  movwf     OWIRE_CNT
owire_response_loop1
  decfsz    OWIRE_CNT,f
  goto      owire_response_loop1
  swapf     PORTA,w
  andlw     b'00000001'
  movwf     OWIRE_BYTE
  movlw     .138
  movwf     OWIRE_CNT
owire_response_loop
  decfsz    OWIRE_CNT,f
  goto      owire_response_loop
  return
  
  ;; -------------------------------------
owire_write1
  bsf       STATUS,RP0
  bcf       TRISA,OWIRE
  nop
  bsf       TRISA,OWIRE
  bcf       STATUS,RP0  
  movlw     .20
  movwf     OWIRE_CNT
owire_write1_loop
  decfsz    OWIRE_CNT,f
  goto      owire_write1_loop
  return
  
  ;; -------------------------------------
owire_write0
  bsf       STATUS,RP0
  bcf       TRISA,OWIRE
  movlw     .21
  movwf     OWIRE_CNT
owire_write0_loop
  decfsz    OWIRE_CNT,f
  goto      owire_write0_loop
  bsf       TRISA,OWIRE
  bcf       STATUS,RP0
  return

  ;; -------------------------------------
owire_write_byte
  movwf     OWIRE_BYTE
  movlw     .8
  movwf     OWIRE_BIT_CNT
owire_write_loop
  btfss     OWIRE_BYTE,0
  call      owire_write0
  btfsc     OWIRE_BYTE,0
  call      owire_write1
  rrf       OWIRE_BYTE,f
  decfsz    OWIRE_BIT_CNT,f
  goto      owire_write_loop
  return

  ;; -------------------------------------
owire_readbit
  bsf       STATUS,RP0
  bcf       TRISA,OWIRE
  nop
  bsf       TRISA,OWIRE
  bcf       STATUS,RP0  
  nop
  btfss     PORTA,OWIRE
  bcf       OWIRE_BYTE,7
  btfsc     PORTA,OWIRE
  bsf       OWIRE_BYTE,7
  movlw     .17
  movwf     OWIRE_CNT
owire_readbit_loop
  decfsz    OWIRE_CNT,f
  goto      owire_readbit_loop
  return

  ;; -------------------------------------
owire_read_byte
  movlw     .8
  movwf     OWIRE_BIT_CNT
owire_read_loop
  call      owire_readbit  
  decfsz    OWIRE_BIT_CNT,f
  goto      owire_read_next  
  return

owire_read_next
  rrf       OWIRE_BYTE,f
  goto      owire_read_loop
  
  ;; -------------------------------------
temp_init
  call      owire_presence
  btfsc     OWIRE_BYTE,0
  goto      temp_init_error

  movlw     TEMP_CMD_W_STAT
  call      owire_write_byte
  movlw     b'01000011'
  call      owire_write_byte
  return

temp_init_error
  ;; TODO: react to missing device
  return

  ;; -------------------------------------
temp_read_value
  call      owire_presence
  btfsc     OWIRE_BYTE,0
  goto      temp_read_value_error

  movlw     TEMP_CMD_START
  call      owire_write_byte

temp_read_value_loop
  movlw     .100
  call      wait_ms
  call      owire_presence
  btfsc     OWIRE_BYTE,0
  goto      temp_read_value_error

  movlw     TEMP_CMD_R_STAT
  call      owire_write_byte
  call      owire_read_byte
  btfss     OWIRE_BYTE,7
  goto      temp_read_value_loop

  
  call      owire_presence
  btfsc     OWIRE_BYTE,0
  goto      temp_read_value_error

  movlw     TEMP_CMD_R_TEMP
  call      owire_write_byte
  call      owire_read_byte
  return

temp_read_value_error
  ;; TODO: react to missing device
  return

  ;; -------------------------------------