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

  LIST      p=16F1847
  include   "p16f1847.inc"
  __config  _CONFIG1,  _FOSC_INTOSC & _WDTE_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_OFF & _CLKOUTEN_OFF & _IESO_OFF & _FCMEN_OFF
  __config  _CONFIG2,  _WRT_OFF & _PLLEN_OFF & _STVREN_OFF & _BORV_LO & _LVP_OFF


  ;; -------------------------------------
  ;; DEFINES  
  ;;   constants
DOT_DEF       EQU .256 - .21      ; .29
DASH_DEF      EQU .256 - .63      ; .87
WSPACE_DEF    EQU .256 - .147     ; .203
TUNE_DEF      EQU DOT_DEF
BCNINTL_DEF   EQU .256 - .120
BCNINTH_DEF   EQU .255
START_CHAR    EQU 'N'
ACK_CHAR      EQU 'A'
OSC_LOW       EQU b'00010000'       ; 31,25 kHz
OSC_HIGH      EQU b'01101000'       ; 4 MHz
    

  ;;   I/O Pins
;; PortA
CW_ENABLE     EQU 2
CW_OUT        EQU 3
IHU_SS        EQU 5
IHU_SDO       EQU 6
IHU_INT       EQU 7  
;; PortB
CLK_1HZ       EQU 0
IHU_SDI       EQU 1
CRX_INT       EQU 3
IHU_SCK       EQU 4
I2C_SDA       EQU 6
I2C_SCL       EQU 7


  ;;   variables
;; page 0 only
ELEMENT     EQU H'0020'
ELECNT      EQU H'0021'
CHAR        EQU H'0022'
PARITY      EQU H'0023'
CHARCNT     EQU H'0024'
PENTLE0     EQU H'0025'
PENTLE1     EQU H'0026'
PENTLECNT   EQU H'0027'
ACK_DATA    EQU H'0028'
TMP1        EQU H'0029'
TMP2        EQU H'002A'

BUF         EQU H'0040'
BUF_END     EQU H'004F'
  
;; all pages
BEACON_INTL EQU H'0070'
BEACON_INTH EQU H'0071'
DOT         EQU H'0072'
ESPACE      EQU DOT
DASH        EQU H'0073'
CSPACE      EQU DASH
WSPACE      EQU H'0074'
TUNE        EQU H'0075'

I2C_BYTE    EQU H'0077'
I2C_BIT_CNT EQU H'0078'
I2C_BYTE_CNT EQU H'0079'

NVSTATE     EQU H'007A'
BEACONCNTH  EQU H'007B'
BEACONCNTL  EQU H'007C'
STATE       EQU H'007D'
W_TEMP      EQU H'007E'
STATUS_TEMP EQU H'007F'

  ;; -------------------------------------
  ;; OFFSET
  org	      0
  goto      init

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

interrupt_end
  ;; restore context
  swapf     STATUS_TEMP,W
  movwf     STATUS
  swapf     W_TEMP,F
  swapf     W_TEMP,W
  retfie

  ;; -------------------------------------
  ;; TABLES
  include   "tables.inc"
  
  ;; -------------------------------------
  ;; SUBROUTINES

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

  ;; -------------------------------------
  include   "i2c.inc"


  ;;; TODO remove this
  ;; -------------------------------------
  ;; -------------------------------------
  ;; -------------------------------------
  ;; -------------------------------------  
  ;; constants
RTC_ADDR_W   EQU b'11010000'
RTC_ADDR_R   EQU b'11010001'
RTC_REG_SEC  EQU H'00'
RTC_REG_MIN  EQU H'01'
RTC_REG_HOUR EQU H'02'
RTC_REG_DOW  EQU H'03'
RTC_REG_DOM  EQU H'04'
RTC_REG_MON  EQU H'05'
RTC_REG_YEAR EQU H'06'
RTC_REG_A1S  EQU H'07'
RTC_REG_A1M  EQU H'08'
RTC_REG_A1H  EQU H'09'
RTC_REG_A1D  EQU H'0A'
RTC_REG_A2M  EQU H'0B'
RTC_REG_A2H  EQU H'0C'
RTC_REG_A2D  EQU H'0D'
RTC_REG_CON  EQU H'0E'
RTC_REG_STAT EQU H'0F'
 
  ;; -------------------------------------
rtc_init
  movlb     .1
  movlw     OSC_HIGH
  movwf     OSCCON  
  movlb     .0
  
  call      i2c_start

  movlw     RTC_ADDR_W
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack
  
  movlw     RTC_REG_STAT
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack

  call      i2c_restart
  
  movlw     RTC_ADDR_R
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack

  call      i2c_recv_byte
  call      i2c_nack

  btfsc     I2C_BYTE,7
  goto      rtc_init_after_clock_fail
  
  call      i2c_stop
  return
  
rtc_init_after_clock_fail
  call      i2c_restart

  movlw     RTC_ADDR_W
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack
  
  movlw     RTC_REG_SEC
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack

  movlw     .16
  movwf     I2C_BYTE_CNT
rtc_init_clear
  clrw
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack
  decfsz    I2C_BYTE_CNT,f
  goto      rtc_init_clear

  call      i2c_stop

  movlb     .1
  movlw     OSC_LOW
  movwf     OSCCON  
  movlb     .0

  return

  ;; ---------------
rtc_get_time
  movlb     .1
  movlw     OSC_HIGH
  movwf     OSCCON  
  movlb     .0


  call      i2c_start

  movlw     RTC_ADDR_W
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack
  
  movlw     RTC_REG_SEC
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack

  call      i2c_restart
  
  movlw     RTC_ADDR_R
  call      i2c_send_byte
  btfsc     I2C_BYTE,0
  goto      rtc_error_ack

  movlw     .7
  movwf     I2C_BYTE_CNT
rtc_get_time_loop
  call      i2c_recv_byte
  movf      I2C_BYTE,w
  movwf     INDF1
  decfsz    I2C_BYTE_CNT,f
  goto      rtc_get_time_next

  call      i2c_nack
  call      i2c_stop

  movlb     .1
  movlw     OSC_LOW
  movwf     OSCCON  
  movlb     .0
  return
  
rtc_get_time_next
  incf      FSR1L,f
  call      i2c_ack
  goto      rtc_get_time_loop

  ;; ---------------
rtc_error_ack
  call      i2c_stop
  ;; TODO: add error handling

  movlb     .1
  movlw     OSC_LOW
  movwf     OSCCON  
  movlb     .0
  return

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

  
  ;; -------------------------------------
  ;; INIT
init
  ;; BANK 3
  movlb     .4
  clrf      WPUA
  clrf     WPUB

  ;; BANK 3
  movlb     .3
  clrf      ANSELA
  clrf      ANSELB

  ;; BANK 2
  movlb     .2
  movlw     b'01100000'
  movwf     APFCON0
  clrf      APFCON1
  bcf       LATB,I2C_SDA
  bcf       LATB,I2C_SCL
  
  ;; BANK 1
  movlb     .1
  movlw     b'00110011'
  movwf     TRISA
  movlw     b'11111111'
  movwf     TRISB
  movlw     OSC_LOW
  movwf     OSCCON
  movlw     b'11000011'
  movwf     OPTION_REG

  ;; BANK 0
  movlb     .0
  movlw     b'00000000'
  movwf     INTCON

  
  bcf       PORTA,CW_OUT
  bcf       PORTA,CW_ENABLE
  
  clrf      NVSTATE             ; TODO: read State from EEPROM
  movlw     .42
  movwf     BEACONCNTL          ; TODO: read Beaconcnt from EEPROM
  movlw     .23
  movwf     BEACONCNTH
  movlw     BCNINTL_DEF         ; TODO: read Beacon Interval from EEPROM
  movwf     BEACON_INTL
  movlw     BCNINTH_DEF
  movwf     BEACON_INTH

  movlw     DOT_DEF             ; TODO: read cw timings from EEPROM
  movwf     DOT                 ;   - DOT: length of .
  movlw     DASH_DEF            ;   - DASH: length of -
  movwf     DASH                ;   - WSPACE: length word space
  movlw     WSPACE_DEF          ;   - TUNE: tune in time of oscillator
  movwf     WSPACE
  movlw     TUNE_DEF
  movwf     TUNE

  ;; -------------------------------------
  ;; MAINLOOP
main
  movlw     BUF
  movwf     FSR1L
  clrf      FSR1H
  call      rtc_get_time
  
  ;; clrw
  ;; call      dottime

  ;; movlw     b'00001100'
  ;; xorwf     PORTA,f
  
  goto	    main

  ;; -------------------------------------
  ;; END
  end