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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/>.
  ;;
  ;; -------------------------------------
  ;; PREAMBLE

  LIST      p=16F887
  include   "p16f887.inc"
  __config  _CONFIG1,  _DEBUG_OFF & _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_NSLEEP & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_ON & _WDT_OFF & _XT_OSC
  __config  _CONFIG2,  _BOR21V & _WRT_OFF
  
  ;; -------------------------------------
  ;; DEFINES
  ;;   constants
  
  ;; I/O Pins
;; PortA
SOLAR_C0      EQU 0
SOLAR_C1      EQU 1
SOLAR_C2      EQU 2
SOLAR_C3      EQU 3
OWIRE         EQU 4
SOLAR_C4      EQU 5
;; PortB
DTMF_INT      EQU 0
BAT_V         EQU 1
SOLAR_V       EQU 2
BAT_C         EQU 3
RTC_SDA       EQU 4
RTC_SCL       EQU 5
RTC_INT       EQU 6
MPU_INT       EQU 7
;; PortC
MPU_PWRDWN    EQU 0
MPU_RESET     EQU 1
MPU_CS        EQU 2
MPU_SCK       EQU 3
MPU_SDI       EQU 4
MPU_SDO       EQU 5
ICOM_TX       EQU 6
ICOM_RX       EQU 7
;; PortD
DTMF_D0       EQU 0
DTMF_D1       EQU 1
DTMF_D2       EQU 2
DTMF_D3       EQU 3
DTMF_PWRDWN   EQU 4
TTX_RESET     EQU 5
TTX_SCL       EQU 6
TTX_SDA       EQU 7
;; PortE
SOLAR_C5      EQU 0
SOLAR_C6      EQU 1
SOLAR_C7      EQU 2
  
  ;;   variables
  ;;     page 0 only
TMP           EQU H'0020'
TTX_BYTE      EQU H'0021'
TTX_BIT_CNT   EQU H'0022'
TTX_BYTE_CNT  EQU H'0023'
TTX_CSUM      EQU H'0024'

RTC_BYTE_CNT  EQU H'0028'

WAIT_CNT      EQU H'0030'

BUF           EQU H'0040'
BUF_END       EQU H'004F'

  ;;   variables
  ;;     page 2 only
CALC_ACC0     EQU H'0110'
CALC_ACC1     EQU H'0111'
CALC_ACC2     EQU H'0112'
CALC_ACC3     EQU H'0113'
CALC_TEMP0    EQU H'0114'
CALC_TEMP1    EQU H'0115'
CALC_TEMP2    EQU H'0116'
CALC_TEMP3    EQU H'0117'
  
  
  ;;     all pages
RTC_BYTE      EQU H'0070'
RTC_BIT_CNT   EQU H'0071'
OWIRE_BYTE    EQU H'0072'
OWIRE_BIT_CNT EQU H'0073'
OWIRE_CNT     EQU H'0074'
  
W_TEMP        EQU H'007E'
STATUS_TEMP   EQU H'007F'

  ;;    bits 
  
  ;; -------------------------------------
  ;; Reset Vector
  org	      0
  goto      init

  ;; -------------------------------------
  ;; Interrupt Vector
  org	      4
  ;; save context
  movwf     W_TEMP
  swapf     STATUS,W
  movwf     STATUS_TEMP

  bcf       STATUS,RP0
  bcf       STATUS,RP1

  btfsc     PIR1,RCIF
  goto      int_uart_rx
  goto      interrupt_end

int_uart_rx
  call      uart_rx_byte
  btfsc     PIR1,RCIF
  call      uart_rx_byte
  btfss     RCSTA,OERR
  goto      int_uart_rx_oe
  goto      interrupt_end
  
int_uart_rx_oe
  bcf       RCSTA,CREN
  bsf       RCSTA,CREN
  
interrupt_end
  ;; restore context
  swapf     STATUS_TEMP,W
  movwf     STATUS
  swapf     W_TEMP,F
  swapf     W_TEMP,W
  retfie

  ;; -------------------------------------
  ;; INIT
init
  ;; bank 3
  bsf       STATUS,RP0
  bsf       STATUS,RP1
  movlw     b'00000000'
  movwf     BAUDCTL
  movlw     b'00000111'
  movwf     ANSELH
  
  ;; bank 1
  bsf       STATUS,RP0
  bcf       STATUS,RP1
  movlw     b'11110000'
  movwf     WPUB
  movlw     b'11000000'
  movwf     IOCB
  movlw     b'01000001'
  movwf     OPTION_REG
  clrf      PSTRCON
  movlw     b'00010000'
  movwf     OSCCON
  movlw     b'11111111'
  movwf     TRISA
  movlw     b'11111111'
  movwf     TRISB
  movlw     b'11111000'
  movwf     TRISC
  movlw     b'10001111'
  movwf     TRISD
  movlw     b'00100100'
  movwf     TXSTA
  movlw     .12
  movwf     SPBRG
  clrf      SPBRGH
  movlw     b'00100000'
  movwf     PIE1
  clrf      PIE2
  
  ;; bank 0
  bcf       STATUS,RP0 
  bcf       STATUS,RP1
  movlw     b'10010000'
  movwf     RCSTA
  movlw     B'01000000'
  movwf     INTCON
  
  clrf      PORTB
  
  bsf       PORTD,DTMF_PWRDWN
  bcf       PORTD,TTX_RESET     ;reset TTX
  bcf       PORTD,TTX_SCL
  bcf       PORTD,TTX_SDA
  clrf      TMR0  

  bsf       INTCON,GIE
  clrf      TMP

  call      rtc_init
  bsf       PORTD,TTX_RESET
  goto      main

  ;; -------------------------------------
  ;; TABLES
  include   "tables.inc"
  
  ;; -------------------------------------
  ;; SUBROUTINES
wait_ms
  movwf     WAIT_CNT
wait_next
  movlw     .9
  movwf     TMR0
  bcf       INTCON,T0IF
wait_loop
  btfss     INTCON,T0IF
  goto      wait_loop
  decfsz    WAIT_CNT,f
  goto      wait_next
  return

  ;; -------------------------------------
uart_rx_byte
  btfsc     RCSTA,FERR
  goto      uart_rx_fe
  movf      RCREG,w             ; TODO: move to input string
  movwf     TMP
  return

uart_rx_fe
  movf      RCREG,w
  return

  ;; -------------------------------------
  include   "math.inc"

  ;; -------------------------------------
  include   "ttx.inc"

  ;; -------------------------------------
  include   "rtc.inc"

  ;; -------------------------------------
  include   "temp.inc"
  
  ;; -------------------------------------
  ;; MAINLOOP
main
  movf      TMP,f
  btfsc     STATUS,Z
  goto      main

  movlw     BUF
  movwf     FSR
  call      rtc_get_time

  swapf     BUF+4,w
  andlw     b'00000011'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      BUF+4,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movlw     '.'
  movwf     TXREG
  movlw     .1
  call      wait_ms

  swapf     BUF+5,w
  andlw     b'00000001'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      BUF+5,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movlw     '.'
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  swapf     BUF+6,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      BUF+6,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movlw     ' '
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  swapf     BUF+2,w
  andlw     b'00000011'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      BUF+2,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  movlw     ':'
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  swapf     BUF+1,w
  andlw     b'00000111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      BUF+1,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  movlw     ':'
  movwf     TXREG
  movlw     .1
  call      wait_ms

  swapf     BUF,w
  andlw     b'00000111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      BUF,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movlw     '\r'
  movwf     TXREG
  movlw     .1
  call      wait_ms
  movlw     '\n'
  movwf     TXREG
  movlw     .1
  call      wait_ms

  call      temp_read_value
  swapf     OWIRE_BYTE,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  movf      OWIRE_BYTE,w
  andlw     b'00001111'
  call      digit
  movwf     TXREG
  movlw     .1
  call      wait_ms
  
  movlw     '\r'  
  movwf     TXREG
  movlw     .1
  call      wait_ms
  movlw     '\n'  
  movwf     TXREG
  
  clrf      TMP
  goto      main
  
powerdown
  sleep
  nop
  goto      main
  
  ;; -------------------------------------
  ;; END
  end