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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=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
#define       SOLAR_C0      PORTA,0
#define       SOLAR_C1      PORTA,1
#define       SOLAR_C2      PORTA,2
#define       VREF          PORTA,3
#define       OWIRE         PORTA,4
#define       OW_TEMP       PORTA,5
;#define       OSC2          PORTA,6
;#define       OSC1          PORTA,7
;; PortB
#define       CTR_INT       PORTB,0
#define       POWER_FAIL    PORTB,1
#define       CAPGOOD       PORTB,2
#define       BAT_INT       PORTB,3
#define       DEPLOY        PORTB,4
#define       RTC_RST       PORTB,5
;#define       PGC           PORTB,6
;#define       PGD           PORTB,7
;; PortC
#define       MPU_RST       PORTC,0
#define       CTR_RST       PORTC,1
#define       BAT_RST       PORTC,2
#define       SPI_SCK       PORTC,3
#define       SPI_MISO      PORTC,4
#define       SPI_MOSI      PORTC,5
#define       MPU_TX        PORTC,6
#define       MPU_RX        PORTC,7
;; PortD
#define       I2C_SCL       PORTD,0
#define       I2C_SDA       PORTD,1
I2C_PORT      EQU           PORTD
I2C_MASK      EQU           b'00000011'
I2C_SDA_MASK  EQU           b'00000010'
#define       CTR_SS        PORTD,2
#define       BAT_SS        PORTD,3
#define       MPU_EN        PORTD,4
#define       HEAT_EN       PORTD,5
#define       RADIO_SILENCE PORTD,6
#define       MAIN_OFF      PORTD,7
;; PortE
#define       SOLAR_V0      PORTE,0
#define       SOLAR_V1      PORTE,1
#define       SOLAR_V2      PORTE,2

  ;;   variables
  ;;     page 0 only
TMP           EQU H'0020'

WAIT_CNT      EQU H'002F'

RTC_BYTE_CNT  EQU H'0028'
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'

  ;;     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_ctr
  btfsc     INTCON,RBIF
  goto      int_portchange
  btfsc     PIR1,RCIF
  goto      int_uart_rx
  goto      interrupt_end

int_ctr
  bcf       INTCON,INTF
  goto      interrupt_end


int_portchange
  btfsc     RTC_RST
  call      rtc_init
  bcf       INTCON,RBIF
  goto      interrupt_end


int_uart_rx
  call      uart_rx_byte
  btfsc     PIR1,RCIF
  call      uart_rx_byte
  btfsc     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'00001000'		; TX non-inverted, 16bit Baudrate, no auto baud detect
  movlw     b'00011000'		; TX inverted, 16bit Baudrate, no auto baud detect
  movwf     BAUDCTL
  movlw     b'11101111'  	; AN0-AN3,AN5-AN7 as analog
  movwf     ANSEL		; AN4 as digital
  clrf      ANSELH		; AN8-AN13 as digital

  ;; bank 1
  bsf       STATUS,RP0
  bcf       STATUS,RP1
  movlw     b'00111111'		; Weak Pull-UPS for
  movwf     WPUB		;   RTC_RST, DEPLOY, CAPGOOD, POWER_FAIL, BAT_INT, CTR_INT
  movlw     b'00100000'		; Port Change Interrup on
  movwf     IOCB		;   RTC_RST
  movlw     b'00000010'		; Weak-Pull-UPs enabled, INT -> falling edge, TMR0 internal clock
  movwf     OPTION_REG		; Prescaler @ TMR0, Prescaler 1:8
  clrf      PSTRCON		; disable pulse steering
  movlw     b'00010000'		; preselct 125 kHz, clock source as configured by configuration word
  movwf     OSCCON
  movlw     b'11001111'		; input: RA0-RA3(analog),RA6-RA7(OSC); output: RA4-RA5(1wire)
  movwf     TRISA
  movlw     b'11111111'		; input: all (interrupts and stats)
  movwf     TRISB
  ;; movlw     b'11010000'		; input: SPI_MISO,RX,TX; output: (MPU|CTR|BAT)_RST,SPI_(CLK|MOSI)
  movlw     b'11111111'		; input: all; output: none
  movwf     TRISC
  movlw     b'00000011'         ; input: I2C_(SDA|SCL); output: (CTR,BAT)_SS, (MPU|HEAT)_EN, RADIO_SILENCE, MAIN_OFF
  movwf     TRISD
  movlw     b'11111111'         ; intput all (analog)
  movwf     TRISE
  movlw     b'00010000'         ; result left justified, V_REF_low = 0, V_REF_high = AN3
  clrf      ADCON1
  movlw     b'00100100'         ; Baudrate = High Speed, async mode, transmit enabled, 8bit
  movwf     TXSTA
  movlw     .34               	; Baudrate = 57600 (@ 8MHz) -> -0,79 % Error
  ;; movlw     .51               	; Baudrate = 38400 (@ 8MHz) -> -0,002 % Error
  ;; movlw     .103               	; Baudrate = 19200 (@ 8MHz) ->  0,16 % Error
  movwf     SPBRG
  clrf      SPBRGH
  movlw     b'00100000'         ; enable UART RX Interrupt
  movwf     PIE1
  clrf      PIE2

  ;; bank 0
  bcf       STATUS,RP0
  bcf       STATUS,RP1
  movlw     b'01000001'		; CLK = FOSC/8, select AN0, ADC on
  movwf     ADCON0
  movlw     b'10010000'		; enable Serial Port, 8bit, enable continues receive, disable address detection
  movwf     RCSTA
  movlw     B'01011000'		; enabble Peripherial, INT and Port Change
  movwf     INTCON

  call      i2c_init
  clrf      TMR0
  bsf       INTCON,GIE
  clrf      TMP

  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

  ;; -------------------------------------
  include   "uart.inc"

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

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

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

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

  ;; -------------------------------------
  ;; include   "solar.inc"

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

  ;; -------------------------------------
  ;; MAINLOOP
main
;  sleep
;  nop
  ;; --------------------
  ;; ADC Test
  ;; call      adc_get_solar
  ;; call      solar_calc_power

  ;; movlw     .255
  ;; call      uart_tx_byte

  ;; movf      ADC_SOLAR_C0,w
  ;; call      uart_tx_byte
  ;; movf      ADC_SOLAR_C1,w
  ;; call      uart_tx_byte
  ;; movf      ADC_SOLAR_C2,w
  ;; call      uart_tx_byte

  ;; movf      ADC_SOLAR_V0,w
  ;; call      uart_tx_byte
  ;; movf      ADC_SOLAR_V1,w
  ;; call      uart_tx_byte
  ;; movf      ADC_SOLAR_V2,w
  ;; call      uart_tx_byte

  ;; movf      SOL_POWERH,w
  ;; call      uart_tx_byte
  ;; movf      SOL_POWERL,w
  ;; call      uart_tx_byte

  ;; goto      main

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

  call      rtc_get_time

  swapf     RTC_TOD3,w
  call      digit
  call      uart_tx_byte

  movf      RTC_TOD3,w
  call      digit
  call      uart_tx_byte

  swapf     RTC_TOD2,w
  call      digit
  call      uart_tx_byte

  movf      RTC_TOD2,w
  call      digit
  call      uart_tx_byte

  swapf     RTC_TOD1,w
  call      digit
  call      uart_tx_byte

  movf      RTC_TOD1,w
  call      digit
  call      uart_tx_byte

  swapf     RTC_TOD0,w
  call      digit
  call      uart_tx_byte

  movf      RTC_TOD0,w
  call      digit
  call      uart_tx_byte

  movlw     '\r'
  call      uart_tx_byte
  movlw     '\n'
  call      uart_tx_byte

  clrf      TMP
  goto      main

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

  ;; call      temp_read_value
  ;; swapf     OWIRE_BYTE,w
  ;; call      digit
  ;; call      uart_tx_byte

  ;; movf      OWIRE_BYTE,w
  ;; call      digit
  ;; call      uart_tx_byte

  ;; movlw     '\r'
  ;; call      uart_tx_byte
  ;; movlw     '\n'
  ;; call      uart_tx_byte

  ;; clrf      TMP
  ;; goto      main

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