From 2544830b8b30a033287a1e14db54853181c026e1 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@mur.at>
Date: Sat, 28 May 2011 00:37:38 +0000
Subject: ported code to PIC12F635 (not tested yet)

git-svn-id: https://svn.spreadspace.org/mur.sat@29 7de4ea59-55d0-425e-a1af-a3118ea81d4c
---
 software/ttx/ttx.asm | 147 ++++++++++++++++++++++++++++++++-------------------
 1 file changed, 92 insertions(+), 55 deletions(-)

(limited to 'software/ttx/ttx.asm')

diff --git a/software/ttx/ttx.asm b/software/ttx/ttx.asm
index 7931771..805d0f4 100644
--- a/software/ttx/ttx.asm
+++ b/software/ttx/ttx.asm
@@ -30,48 +30,97 @@
   ;; -------------------------------------
   ;; PREAMBLE
 
-  LIST      p=12F519
-  include   "p12f519.inc"
-  ;;   __config _IntRC_OSC & _IOSCFS_4MHz & _MCLRE_ON & _CP_OFF & _CPDF_OFF & _WDTE_OFF
-  __config _IntRC_OSC & _IOSCFS_4MHz & _MCLRE_OFF & _CP_OFF & _CPDF_OFF & _WDTE_OFF
+  LIST      p=12F635
+  include   "p12f635.inc"
+  __config _WUREN_ON & _FCMEN_OFF & _IESO_OFF & _BOD_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
   
   ;; -------------------------------------
   ;; DEFINES
-BEACON_INT  EQU .5
-SECCNT      EQU H'0007'
+BEACON_INT  EQU .3              ; *2 = Beacon Interval in seconds
+SECCNT      EQU H'0040'
 
-CHAR        EQU H'0008'
-CHARCNT     EQU H'0009'
-ELEMENT     EQU H'000A'
-ELECNT      EQU H'000B'
+CHAR        EQU H'0041'
+CHARCNT     EQU H'0042'
+ELEMENT     EQU H'0043'
+ELECNT      EQU H'0044'
   
-DOT         EQU .85
-DASH        EQU .255
-ESPACE      EQU .85
-CSPACE      EQU .255
-CWSPEED     EQU .100
-DOTCNT0     EQU H'000E'
-DOTCNT1     EQU H'000F'
+DOT         EQU .256 -  .29
+DASH        EQU .256 -  .87
+ESPACE      EQU .256 -  .29
+CSPACE      EQU .256 -  .87
+WSPACE      EQU .256 - .203
+
+CWENABLE    EQU GP0
+CWOUT       EQU GP1
+SCLK        EQU GP2
+SDAT        EQU GP4
+
+W_TEMP      EQU H'007E'
+STATUS_TEMP EQU H'007F'
 
-CWENABLE    EQU 0
-CWOUT       EQU 1
-  
   ;; -------------------------------------
-  ;; OFFSET
+  ;; Reset Vector
   org	      0
+  goto      init
+
+  ;; -------------------------------------
+  ;; Interrupt Vector
+  org	      4
+  ;; save context
+  movwf     W_TEMP
+  swapf     STATUS,W
+  movwf     STATUS_TEMP
+
+  btfss     INTCON,INTF
+  goto      tmr1_int
+ext_int
+  ;; TODO: read bit from GPIO,SDAT and add to received string
+  goto      interrupt_end
+  
+tmr1_int
+  decf      SECCNT,f
+
+interrupt_end
+  ;; restore context
+  swapf     STATUS_TEMP,W
+  movwf     STATUS
+  swapf     W_TEMP,F
+  swapf     W_TEMP,W
+  retfie
 
   ;; -------------------------------------
   ;; INIT
 init
-  movlw     b'11110110'
-  option
+  ;; bank 1
+  bsf       STATUS,RP0
+  bcf       STATUS,RP1
+
+  movlw     b'10000101'
+  movwf     OPTION_REG
   movlw     b'11111100'
-  tris	    PORTB
-  bcf       PORTB,CWOUT
-  bcf       PORTB,CWENABLE
-  clrf      TMR0
+  movwf     TRISIO
+  movlw     b'10000001'
+  movwf     PIE1
+  movlw     b'00001000'
+  movwf     OSCCON
+  
+  bcf       STATUS,RP0  
+
+  ;; bank 0
+  movlw     b'01010000'
+  movwf     INTCON
+  movlw     b'00000111'
+  movwf     T1CON
+  movlw     b'00000111'
+  movwf     CMCON0
+  
+  bcf       GPIO,CWOUT
+  bcf       GPIO,CWENABLE
+
   movlw     BEACON_INT
   movwf     SECCNT
+
+  bsf       INTCON,GIE
   goto      main
 
   ;; -------------------------------------
@@ -218,23 +267,16 @@ string
   ;; -------------------------------------
   ;; SUBROUTINES
 dottime
-  movwf     DOTCNT1
-dot_outer   
-  movlw     CWSPEED
-  movwf     DOTCNT0
+  movwf     TMR0
+  bcf       INTCON,T0IF
 dot_inner
-  nop
-  nop
-  nop
-  nop
-  decfsz    DOTCNT0,f
+  btfss     INTCON,T0IF
   goto      dot_inner
-  decfsz    DOTCNT1,f
-  goto      dot_outer
   return
 
   ;; -------------------------------------
 send_beacon
+  bsf       GPIO,CWENABLE
   movlw     .7
   movwf     CHARCNT
 
@@ -252,13 +294,13 @@ beacon_next_char
   goto      beacon_invalid_char
 
 beacon_next_element
-  bsf       PORTB,CWOUT
+  bsf       GPIO,CWOUT
   btfss     ELEMENT,7
   movlw     DOT
   btfsc     ELEMENT,7
   movlw     DASH
   call      dottime
-  bcf       PORTB,CWOUT
+  bcf       GPIO,CWOUT
 
   rlf       ELEMENT,f
 
@@ -270,6 +312,7 @@ beacon_next_element
 beacon_invalid_char
   decfsz    CHARCNT,f
   goto      beacon_next_char
+  bcf       GPIO,CWENABLE
   return
 
 beacon_element_space
@@ -280,27 +323,21 @@ beacon_element_space
   ;; -------------------------------------
   ;; MAINLOOP
 main
-  movf      TMR0,w
+  ;; this gets called after reset and whenever a wakeup occured
+  ;; (after TMR1 overrun or interrupt on GP2)
+  movf      SECCNT,f
   btfss     STATUS,Z
-  goto      main
+  goto      powerdown
 
-  ;; this gets called every second
-  decfsz    SECCNT,f
-  goto      waitfor0
+  ;; this gets called every BEACON_INT*2 seconds
   movlw     BEACON_INT
   movwf     SECCNT
-
-  ;; this gets called every BEACON_INT seconds
   call      send_beacon
-  
-  ;; is the timer above zero?
-waitfor0
-  movf      TMR0,w
-  btfsc     STATUS,Z
-  goto      waitfor0
-
-  goto	    main
 
+powerdown
+  sleep
+  goto      main
+  
   ;; -------------------------------------
   ;; END
   end
-- 
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