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|
;;
;; mur.sat
;;
;; Somewhen in the year 2012, 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
;; -------------------------------------
|
