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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
#define CW_ENABLE PORTA,2
#define CW_OUT PORTA,3
#define IHU_SS PORTA,5
#define IHU_SDO PORTA,6
#define IHU_INT PORTA,7
;; PortB
#define CLK_1HZ PORTB,0
#define IHU_SDI PORTB,1
#define CRX_INT PORTB,3
#define IHU_SCK PORTB,4
#define I2C_SDA PORTB,6
#define I2C_SCL PORTB,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 I2C_SDA
bcf 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 CW_OUT
bcf 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
|
