;;
  ;;  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=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
I2C_SDA       EQU 4
I2C_SCL       EQU 5
RTC_INT       EQU 6
RTC_RST       EQU 7
;; PortC
MPU_PWRDWN    EQU 0
MPU_RESET     EQU 1
UNDEF_C2      EQU 2
UNDEF_C3      EQU 3
UNDEF_C4      EQU 4
UNDEF_C5      EQU 5
MPU_TX        EQU 6
MPU_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'002F'

DTMF_BUF      EQU H'0030'       ; 5Bytes for incoming DTMF commands
DTMF_BUF_END  EQU H'0034'
DTMF_BUF_PTR  EQU H'0035'
DTMF_CS       EQU H'0036'
  
RTC_TOD0      EQU H'003A'
RTC_TOD1      EQU H'003B'
RTC_TOD2      EQU H'003C'
RTC_TOD3      EQU H'003D'
  
BUF           EQU H'0040'
BUF_END       EQU H'004F'

ADC_SOLAR_C0  EQU H'0050'
ADC_SOLAR_C1  EQU H'0051'
ADC_SOLAR_C2  EQU H'0052'
ADC_SOLAR_C3  EQU H'0053'
ADC_SOLAR_V0  EQU H'0054'
ADC_SOLAR_C4  EQU H'0055'
ADC_SOLAR_C5  EQU H'0056'
ADC_SOLAR_C6  EQU H'0057'
ADC_SOLAR_C7  EQU H'0058'
ADC_SOLAR_V1  EQU H'0059'
SOL_POWERL    EQU H'005A'
SOL_POWERH    EQU H'005B'

SOL_CALC_0    EQU H'005C'
SOL_CALC_1    EQU H'005D'
SOL_CALC_2    EQU H'005E'
SOL_CALC_3    EQU H'005F'
SOL_CALC_4    EQU H'0060'
SOL_CALC_5    EQU H'0061'
SOL_CALC_6    EQU H'0062'
SOL_CALC_7    EQU H'0063'
SOL_CALC_8    EQU H'0064'
SOL_CALC_9    EQU H'0065'
SOL_CALC_CNT  EQU H'0066'
  
  ;;   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
I2C_BYTE      EQU H'0070'
I2C_BIT_CNT   EQU H'0071'
OWIRE_BYTE    EQU H'0072'
OWIRE_BIT_CNT EQU H'0073'
OWIRE_CNT     EQU H'0074'

FSR_TEMP      EQU H'007D'  
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
  movf      FSR,w
  movwf     FSR_TEMP
  
  bcf       STATUS,RP0
  bcf       STATUS,RP1

  ;;  dispatch interrupt sources
  btfsc     INTCON,INTF
  goto      int_dtmf
  btfsc     INTCON,RBIF
  goto      int_rtc
  btfsc     PIR1,RCIF
  goto      int_uart_rx
  goto      interrupt_end
int_dtmf
  movf      DTMF_BUF_PTR,w
  movwf     FSR
  movf      PORTD,w
  andlw     b'00001111'
  xorwf     DTMF_CS,f
  movwf     INDF
  incf      DTMF_BUF_PTR,f
  movlw     DTMF_BUF_END
  subwf     DTMF_BUF_PTR,w
  btfss     STATUS,C
  goto      int_dtmf_end
  btfsc     STATUS,Z
  goto      int_dtmf_end

  ;;  DTMF command complete
  movlw     .1
  movwf     TMP
  
int_dtmf_end
  bcf       INTCON,INTF
  goto      interrupt_end


int_rtc
  btfsc     PORTB,RTC_RST
  call      rtc_init
  goto      int_rtc_end
  
int_rtc_end
  bcf       INTCON,RBIF
  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
  movf      FSR_TEMP,w
  movwf     FSR
  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'11111111'
  movwf     ANSEL
  movlw     b'00000111'
  movwf     ANSELH
  
  ;; bank 1
  bsf       STATUS,RP0
  bcf       STATUS,RP1
  movlw     b'01110000'
  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'11111100'
  movwf     TRISC
  movlw     b'10001111'
  movwf     TRISD
  movlw     b'11111111'
  movwf     TRISE
  clrf      ADCON1
  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'01000001'
  movwf     ADCON0
  movlw     b'10010000'
  movwf     RCSTA
  movlw     B'01011000'
  movwf     INTCON
  
  clrf      PORTB
  
  bcf       PORTD,DTMF_PWRDWN
  movlw     DTMF_BUF
  movwf     DTMF_BUF_PTR
  clrf      DTMF_CS
  
  bcf       PORTD,TTX_SCL
  bcf       PORTD,TTX_SDA
  nop
  bcf       PORTD,TTX_RESET     ;reset TTX
  clrf      TMR0  

  bsf       INTCON,GIE
  clrf      TMP

  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   "i2c.inc"

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

  ;; -------------------------------------
  include   "temp.inc"
  
  ;; -------------------------------------
  include   "adc.inc"

  ;; -------------------------------------
  include   "solar.inc"
  
  ;; -------------------------------------
  ;; MAINLOOP
main
;  sleep
;  nop
  ;; --------------------
  ;; TTX Test
  ;; movf      TMP,w
  ;; btfsc     STATUS,Z
  ;; goto      main

  ;; movlw     BUF
  ;; movwf     FSR
  ;; movlw     0x50
  ;; call      ttx_send

  ;; clrf      TMP
  ;; goto      main

;;   xorlw     .0
;;   btfss     STATUS,Z
;;   goto      main_error
  
;;   movlw     'O'
;;   movwf     TXREG
;;   movlw     .1
;;   call      wait_ms
;;   movlw     'K'
;;   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
;;   goto      main
  
;; main_error
;;   movlw     'E'
;;   movwf     TXREG
;;   movlw     .1
;;   call      wait_ms
;;   movlw     'R'
;;   movwf     TXREG
;;   movlw     .1
;;   call      wait_ms
;;   movlw     'R'
;;   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  
;;   goto      main

  ;; --------------------
  ;; ADC Test
  ;; call      adc_get_solar
  ;; call      solar_calc_power

  ;; movlw     .255
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C0,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C1,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C2,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C3,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_V0,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C4,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C5,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C6,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_C7,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      ADC_SOLAR_V1,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      SOL_POWERH,w
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; movf      SOL_POWERL,w
  ;; movwf     TXREG  
  ;; movlw     .8
  ;; call      wait_ms

  ;; goto      main

  ;; --------------------
  ;; DTMF Test program
  movf      TMP,f
  btfsc     STATUS,Z
  goto      main

  movlw     BUF
  movwf     FSR
  swapf     DTMF_BUF+3,w
  andlw     b'11110000'
  call      ttx_send

  movf      DTMF_BUF,w
  call      dtmfSign
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      DTMF_BUF+1,w
  call      dtmfSign
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      DTMF_BUF+2,w
  call      dtmfSign
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      DTMF_BUF+3,w
  call      dtmfSign
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      DTMF_BUF+4,w
  call      dtmfSign
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movlw     ' '
  movwf     TXREG
  movlw     .1
  call      wait_ms

  movf      DTMF_CS,f
  btfsc     STATUS,Z
  movlw     '!'
  btfss     STATUS,Z
  movlw     'x'
  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


  clrf      TMP
  movlw     DTMF_BUF
  movwf     DTMF_BUF_PTR
  clrf      DTMF_CS
 
  goto      main

  ;; --------------------
  ;; RTC Test program  
  ;; movf      TMP,f
  ;; btfsc     STATUS,Z
  ;; goto      main

  ;; call      rtc_get_time

  ;; swapf     RTC_TOD3,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms
  
  ;; movf      RTC_TOD3,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; swapf     RTC_TOD2,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms
  
  ;; movf      RTC_TOD2,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; swapf     RTC_TOD1,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms
  
  ;; movf      RTC_TOD1,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms

  ;; swapf     RTC_TOD0,w
  ;; andlw     b'00001111'
  ;; call      digit
  ;; movwf     TXREG
  ;; movlw     .1
  ;; call      wait_ms
  
  ;; movf      RTC_TOD0,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

  ;; --------------------
  ;; Temp Test program    
  ;; movf      TMP,f
  ;; btfsc     STATUS,Z
  ;; goto      main
  
  ;; 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
    
  ;; -------------------------------------
  ;; END
  end