first working communication between ihu and ttx

ttx has 2s watchdog now
ttx main timer wakes every second
better input check for sending chars


git-svn-id: https://svn.spreadspace.org/mur.sat@54 7de4ea59-55d0-425e-a1af-a3118ea81d4c

1 files changed, 205 insertions, 113 deletions

diff --git a/software/ttx/ttx.asm b/software/ttx/ttx.asm
index 3a9664b..454e10c 100644
--- a/software/ttx/ttx.asm
+++ b/software/ttx/ttx.asm
@@ -32,21 +32,24 @@
 
   LIST      p=12F635
   include   "p12f635.inc"
-  __config _WUREN_OFF & _FCMEN_OFF & _IESO_OFF & _BOD_OFF & _CPD_OFF & _CP_OFF & _MCLRE_ON & _PWRTE_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
+  __config _WUREN_OFF & _FCMEN_OFF & _IESO_OFF & _BOD_OFF & _CPD_OFF & _CP_OFF & _MCLRE_ON & _PWRTE_OFF & _WDT_ON & _INTRC_OSC_NOCLKOUT
   
   ;; -------------------------------------
   ;; DEFINES
   ;;   constants
 
-DOT         EQU .256 - .29  
-DASH        EQU .256 - .87 
+DOT         EQU .256 - .21      ; .29
+DASH        EQU .256 - .63      ; .87
 ESPACE      EQU DOT
 CSPACE      EQU DASH
-WSPACE      EQU .256 - .203
+WSPACE      EQU .256 - .147     ; .203
 ENABLE_TIME EQU DOT
-BCONINT_DEF EQU .5              ; *2 = Beacon Interval in seconds
-START_CHAR  EQU 'A' - ' '
-
+BCONINT_DEF EQU .42
+START_CHAR  EQU 'A'
+ACK_CHAR    EQU 'A'
+OSC_LOW     EQU b'00000000'
+OSC_HIGH    EQU b'01100000'
+    
   ;;   I/O Pins
 CWENABLE    EQU GP0
 CWOUT       EQU GP1
@@ -63,20 +66,28 @@ CHARCNT     EQU H'0044'
 PENTLE0     EQU H'0045'
 PENTLE1     EQU H'0046'
 PENTLECNT   EQU H'0047'
-
+ACK_DATA    EQU H'0048'
+  
+RX_CNT      EQU H'004E'
+RX_BYTE     EQU H'004F'
+  
 BUF         EQU H'0050'
 
   ;;     all pages
+STATE       EQU H'0078'
 BEACON_INT  EQU H'0079'
-STATE       EQU H'007A'
+NVSTATE     EQU H'007A'
 BEACONCNTH  EQU H'007B'
 BEACONCNTL  EQU H'007C'
 SECCNT      EQU H'007D'
 W_TEMP      EQU H'007E'
 STATUS_TEMP EQU H'007F'
 
-  ;;    bits STATE
+  ;;    bits NVSTATE
 safe        EQU .0
+
+  ;;    bits STATE
+rx          EQU .0
   
   ;; -------------------------------------
   ;; Reset Vector
@@ -91,29 +102,56 @@ safe        EQU .0
   swapf     STATUS,W
   movwf     STATUS_TEMP
 
-  bcf       STATUS,RP0
-  bcf       STATUS,RP1
-  
   btfss     INTCON,INTF
   goto      tmr1_int
 ext_int
-  ;; TODO: read bit from GPIO,SDAT and add to received string
+  bcf       INTCON,INTF  
+  btfsc     STATE,rx
   goto      interrupt_end
+  bsf       STATUS,RP0
+  movlw     OSC_HIGH
+  movwf     OSCCON
+  bcf       STATUS,RP0
+  movlw     .8
+  movwf     RX_CNT
+ext_int_clk_low
+  btfsc     GPIO,SCLK
+  goto      ext_int_clk_low
+ext_int_clk_high
+  btfss     GPIO,SCLK
+  goto      ext_int_clk_high
+  btfss     GPIO,SDAT
+  bcf       RX_BYTE,0
+  btfsc     GPIO,SDAT
+  bsf       RX_BYTE,0
+  decfsz    RX_CNT,f
+  goto      ext_int_rx_next
+  bsf       STATE,rx
+  bsf       STATUS,RP0
+  movlw     OSC_LOW
+  movwf     OSCCON
+  goto      interrupt_end
+
+ext_int_rx_next
+  rlf       RX_BYTE,f
+  goto      ext_int_clk_low
   
 tmr1_int
+  bcf       STATUS,RP0
   bcf       PIR1,TMR1IF
-  btfsc     STATE,safe          ; safe mode -> disable scheduler
-  goto      disable_tmr1        
-  movf      SECCNT,w
+  bcf       T1CON,TMR1ON
+  clrf      TMR1L
+  movlw     b'10000000'
+  movwf     TMR1H
+  btfsc     NVSTATE,safe          ; safe mode -> disable scheduler
+  goto      interrupt_end
+
+  bsf       T1CON,TMR1ON  
+  movf      SECCNT,f
   btfss     STATUS,Z
-  decf      SECCNT,f          
+  decf      SECCNT,f
   goto      interrupt_end
 
-disable_tmr1
-  bcf       T1CON,TMR1ON
-  movf      BEACON_INT,w
-  movwf     SECCNT 
-  
 interrupt_end
   ;; restore context
   swapf     STATUS_TEMP,W
@@ -123,55 +161,6 @@ interrupt_end
   retfie
 
   ;; -------------------------------------
-  ;; INIT
-init
-  ;; bank 1
-  bsf       STATUS,RP0
-  bcf       STATUS,RP1
-
-  movlw     b'11000101'
-  movwf     OPTION_REG
-  movlw     b'11111100'
-  movwf     TRISIO
-  movlw     b'00000001'
-  movwf     PIE1
-  movlw     b'00010000'
-  movwf     OSCCON
-  
-  bcf       STATUS,RP0  
-
-  ;; bank 0
-  clrf      TMR1L
-  clrf      TMR1H
-  movlw     b'00000110'
-  movwf     T1CON
-  movlw     b'01000000'         ; enable external interrupt bit4
-  movwf     INTCON
-
-  movlw     b'00000111'
-  movwf     CMCON0
-
-  bcf       GPIO,CWOUT
-  bcf       GPIO,CWENABLE
-
-  movf      BEACON_INT,w
-  movwf     SECCNT
-
-  clrf      STATE               ; TODO: read State from EEPROM
-  movlw     .42
-  movwf     BEACONCNTL          ; TODO: read Beaconcnt from EEPROM
-  movlw     .23
-  movwf     BEACONCNTH
-  movlw     BCONINT_DEF         ; TODO: read Beacon Interval from EEPROM
-  movwf     BEACON_INT
-  
-  btfss     STATE,safe          ; safe mode -> disable scheduler
-  bsf       T1CON,TMR1ON
-  
-  bsf       INTCON,GIE
-  goto      main
-
-  ;; -------------------------------------
   ;; TABLES
 
   ;; Morse Codes: 0=dot, 1=dash
@@ -303,50 +292,103 @@ getcwlen
   ;; Base32 Code
 base32
   addwf     PCL,f
-  retlw     'A' - ' '
-  retlw     'B' - ' '
-  retlw     'C' - ' '
-  retlw     'D' - ' '
-  retlw     'E' - ' '
-  retlw     'F' - ' '
-  retlw     'G' - ' '
-  retlw     'H' - ' '
-  retlw     'I' - ' '
-  retlw     'J' - ' '
-  retlw     'K' - ' '
-  retlw     'L' - ' '
-  retlw     'M' - ' '
-  retlw     'N' - ' '
-  retlw     'O' - ' '
-  retlw     'P' - ' '
-  retlw     'Q' - ' '
-  retlw     'R' - ' '
-  retlw     'S' - ' '
-  retlw     'T' - ' '
-  retlw     'U' - ' '
-  retlw     'V' - ' '
-  retlw     'W' - ' '
-  retlw     'X' - ' '
-  retlw     'Y' - ' '
-  retlw     'Z' - ' '
-  retlw     '2' - ' '
-  retlw     '3' - ' '
-  retlw     '4' - ' '
-  retlw     '5' - ' '
-  retlw     '6' - ' '
-  retlw     '7' - ' '
+  retlw     'A'
+  retlw     'B'
+  retlw     'C'
+  retlw     'D'
+  retlw     'E'
+  retlw     'F'
+  retlw     'G'
+  retlw     'H'
+  retlw     'I'
+  retlw     'J'
+  retlw     'K'
+  retlw     'L'
+  retlw     'M'
+  retlw     'N'
+  retlw     'O'
+  retlw     'P'
+  retlw     'Q'
+  retlw     'R'
+  retlw     'S'
+  retlw     'T'
+  retlw     'U'
+  retlw     'V'
+  retlw     'W'
+  retlw     'X'
+  retlw     'Y'
+  retlw     'Z'
+  retlw     '2'
+  retlw     '3'
+  retlw     '4'
+  retlw     '5'
+  retlw     '6'
+  retlw     '7'
 
   ;; fixed strings
 callsign
   addwf     PCL,f
   nop
-  retlw     'R' - ' '
-  retlw     'U' - ' '
-  retlw     'M' - ' '
-  retlw     '6' - ' '
-  retlw     'E' - ' '
-  retlw     'O' - ' '
+  retlw     'R'
+  retlw     'U'
+  retlw     'M'
+  retlw     '6'
+  retlw     'E'
+  retlw     'O'
+
+  ;; -------------------------------------
+  ;; INIT
+init
+  ;; bank 1
+  bsf       STATUS,RP0
+  bcf       STATUS,RP1
+
+  movlw     b'11000011'
+  movwf     OPTION_REG
+  movlw     b'11111100'
+  movwf     TRISIO
+  movlw     b'00000001'
+  movwf     PIE1
+  movlw     OSC_LOW
+  movwf     OSCCON
+  
+  bcf       STATUS,RP0  
+
+  ;; bank 0
+  movlw     b'00010110'
+  movwf     WDTCON
+  clrf      TMR1L
+  movlw     b'10000000'
+  movwf     TMR1H
+  movlw     b'00000110'
+  movwf     T1CON
+  movlw     b'01010000'
+  movwf     INTCON
+
+  movlw     b'00000111'
+  movwf     CMCON0
+
+  bcf       GPIO,CWOUT
+  bcf       GPIO,CWENABLE
+
+  clrf      STATE
+  clrf      NVSTATE             ; TODO: read State from EEPROM
+  movlw     .42
+  movwf     BEACONCNTL          ; TODO: read Beaconcnt from EEPROM
+  movlw     .23
+  movwf     BEACONCNTH
+  movlw     BCONINT_DEF         ; TODO: read Beacon Interval from EEPROM
+  movwf     BEACON_INT
+
+  movf      BEACON_INT,w
+  movwf     SECCNT
+  
+  btfss     NVSTATE,safe        ; safe mode -> disable scheduler
+  bsf       T1CON,TMR1ON
   
+  bsf       INTCON,GIE
+  goto      main
+
   ;; -------------------------------------
   ;; SUBROUTINES
 dottime
@@ -355,11 +397,24 @@ dottime
 dot_inner
   btfss     INTCON,T0IF
   goto      dot_inner
+  clrwdt
   return
 
   ;; -------------------------------------
 send_char
   movwf     CHAR
+  movlw     'Z' + 1
+  subwf     CHAR,w
+  btfsc     STATUS,C
+  return
+  movlw     ' '
+  subwf     CHAR,f
+  btfss     STATUS,C
+  return
+  btfsc     STATUS,Z
+  return
+
+  movf      CHAR,w
   call      getcw
   movwf     ELEMENT
   movf      CHAR,w
@@ -368,7 +423,6 @@ send_char
   movf      ELECNT,f
   btfsc     STATUS,Z
   return
-  movf      CHAR,w
   xorwf     PARITY,f
   
 char_next_element
@@ -559,6 +613,8 @@ send_parity
   andlw     b'00011111'
   call      base32
   call      send_char
+  movlw     WSPACE
+  call      dottime
   return
 
   ;; -------------------------------------
@@ -596,18 +652,54 @@ beacon_end
   return
 
   ;; -------------------------------------
+send_ack
+  movwf     ACK_DATA
+  bsf       GPIO,CWENABLE
+  movlw     ENABLE_TIME
+  call      dottime
+  clrf      PARITY
+
+  movlw     ACK_CHAR
+  call      send_char
+
+  movlw     CSPACE
+  call      dottime
+
+  movf      ACK_DATA,w
+  call      send_char
+
+  movlw     CSPACE
+  call      dottime
+
+  call      send_parity
+
+  bcf       GPIO,CWENABLE
+  return
+
+  ;; -------------------------------------
   ;; MAINLOOP
 main
   ;; this gets called after reset and whenever a wakeup occured
   ;; (after TMR1 overrun or interrupt on GP2)
   movf      SECCNT,f
-  btfss     STATUS,Z
+  btfsc     STATUS,Z
+  goto      seccnt_zero
+  btfsc     STATE,rx
+  goto      byte_received
   goto      powerdown
 
-  ;; this gets called every 2*BEACON_INT seconds
+  ;; this gets called every BEACON_INT seconds
+seccnt_zero
   movf      BEACON_INT,w
   movwf     SECCNT 
   call      send_beacon
+  goto      powerdown
+
+  ;; this gets called whenver a byte was received from ihu
+byte_received
+  movf      RX_BYTE,w
+  bcf       STATE,rx
+  call      send_ack
   
 powerdown
   sleep