diff --git a/CHANGELOG b/CHANGELOG
new file mode 100644
index 0000000..f191725
--- /dev/null
+++ b/CHANGELOG
@@ -0,0 +1,67 @@
+
+RCS file: RCS/keypad.asm,v
+Working file: keypad.asm
+head: 1.34
+branch:
+locks: strict
+ tundra: 1.34
+access list:
+symbolic names:
+keyword substitution: kv
+total revisions: 11; selected revisions: 11
+description:
+PIC Based Keypad Decoding System
+----------------------------
+revision 1.34 locked by: tundra;
+date: 2002/06/18 16:44:33; author: tundra; state: Exp; lines: +3 -3
+Fixed bug in serial output bit count setup.
+----------------------------
+revision 1.33
+date: 2002/06/05 15:07:58; author: tundra; state: Exp; lines: +3 -3
+Changed keypad scan delay to a nominal 125ms.
+----------------------------
+revision 1.32
+date: 2002/06/05 14:12:54; author: tundra; state: Exp; lines: +17 -2
+Added a nominal 333ms delay between keyboard scans. This is needed
+to limit the keystroke repeat rate.
+----------------------------
+revision 1.31
+date: 2002/05/29 17:22:02; author: tundra; state: Exp; lines: +3 -3
+Changed DEBOUNCE_TIME to maintain 5ms interval between debounce
+read attempts.
+----------------------------
+revision 1.30
+date: 2002/05/29 17:20:06; author: tundra; state: Exp; lines: +5 -5
+Changed basic TMR0 interval to 480us.
+----------------------------
+revision 1.24
+date: 2002/05/28 19:06:36; author: tundra; state: Exp; lines: +3 -2
+Fixed bug in serial clocking to reset clock at the end of clocking
+cycle.
+----------------------------
+revision 1.23
+date: 2002/05/28 19:03:00; author: tundra; state: Exp; lines: +41 -18
+Added serial output logic.
+----------------------------
+revision 1.22
+date: 2002/05/28 18:35:36; author: tundra; state: Exp; lines: +86 -29
+Added logic to select serial or parallel output at init time.
+Completed parallel output routine. Wrote skeleton of serial output
+routine.
+----------------------------
+revision 1.21
+date: 2002/05/28 15:47:18; author: tundra; state: Exp; lines: +11 -9
+Cleaned up and added explanatory comments.
+----------------------------
+revision 1.2
+date: 2002/05/28 15:18:33; author: tundra; state: Exp; lines: +48 -13
+Changed basic TMR0 interrupt interval to 1ms (previously 10ms).
+Split key read into separate debounce and translate routines.
+Debounce is now defined to be DEBOUNCE_COUNT consecutive reads
+with no change on the keyboard. A wait of DEBOUNCE_TIME TMR0
+interrupt ticks is inserted between each keyboard read attempt.
+----------------------------
+revision 1.1
+date: 2002/05/22 13:24:46; author: tundra; state: Exp;
+Initial revision
+=============================================================================
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d8afaf4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,59 @@
+# Makefile for PIC keypad.asm embedded keypad controller
+# $Id: Makefile,v 1.1 2002/05/05 22:25:29 tundra Exp tundra $
+
+#BURN_PGM = c:/usr/local/PIC/pp/pp
+#BURN_OPT = "-!"
+#VRFY_OPT = "-!v"
+
+
+BURN_PGM = c:/usr/local/PIC/fpp/fppdos.exe
+GENERAL_OPT = -! -h3:1 -t20
+DUMP_OPT = -d
+VRFY_OPT = -v
+ERASE_OPT = -e
+INC_DIR = ../include
+SRC_FILE = keypad.asm
+
+RELEASE_FILES = keypad.asm keypad-license.txt readme.txt
+RELEASE_FILES1 = keypad.hex keypad.lst keypad.xrf
+RELEASE_DIR = Latest-Release
+SCHEMATIC_DIR = Schematic
+
+
+ASM_OPTIONS = /dINCFILES=${INC_DIR} /t8 /x /q
+
+
+a all assemble:
+ @c:/progra~1/mplab/mpasm ${ASM_OPTIONS} ${SRC_FILE}
+ @ls -l *err
+
+b burn:
+ @${BURN_PGM} ${GENERAL_OPT} keypad.hex
+ @make verify
+
+c clean:
+ @rm -f *.cod *.err *.hex *.lst *.obj *.xrf dump*.hex *~ *#* \#* *.erc
+
+d dump:
+ @${BURN_PGM} ${GENERAL_OPT} ${DUMP_OPT} dump_keypad.hex
+
+e erase:
+ @${BURN_PGM} ${GENERAL_OPT} ${ERASE_OPT}
+
+r release:
+ @- mkdir ${RELEASE_DIR}
+ @- co -l ${RELEASE_FILES}
+ @make assemble
+ @mv ${RELEASE_FILES} ${RELEASE_DIR}
+ @mv ${RELEASE_FILES1} ${RELEASE_DIR}
+ @cp Makefile ${RELEASE_DIR}
+ @cp ${SCHEMATIC_DIR}/* ${RELEASE_DIR}
+ @rlog ${SRC_FILE} >${RELEASE_DIR}/CHANGELOG
+ @make clean
+
+rc relclean:
+ @- rm -rf ${RELEASE_DIR}
+ @make clean
+
+v verify:
+ @${BURN_PGM} ${GENERAL_OPT} ${VRFY_OPT} keypad.hex
diff --git a/keypad-board.jpg b/keypad-board.jpg
new file mode 100644
index 0000000..fe4291b
--- /dev/null
+++ b/keypad-board.jpg
Binary files differ
diff --git a/keypad-license.txt b/keypad-license.txt
new file mode 100644
index 0000000..9e2992d
--- /dev/null
+++ b/keypad-license.txt
@@ -0,0 +1,65 @@
+keypad - Copyright (c) 2002, TundraWare Inc., All Rights Reserved
+$Id: keypad-license.txt,v 1.1 2002/05/05 22:28:20 tundra Exp tundra $
+
+This license refers to the hardware design, schematics, software, and
+all other files found in the keypad zip archive. Hereafter, these
+are referred to collectively as the "keypad system".
+
+Permission to use and distribute the keypad system is hereby granted so
+long as ALL the following conditions are met:
+
+ 1) The user of the keypad system understands and agrees that
+ this is an experimental hardware/software system which is
+ provided "AS-IS" with no warranties expressed or implied by
+ TundraWare Inc.
+
+ 2) The user acknowledges the keypad system has NOT been tested for:
+ a) Correct operation
+ b) Freedom from unintended consequences
+ c) Any operation or condition which might cause damage to
+ the user's machine, software, network, or data, or which
+ might cause any breach of system security of the user's
+ system(s) or any other systems.
+
+ 3) By using the keypad system, the user does so at their own
+ risk and agrees to hold TundraWare Inc. harmless for any
+ damage, direct or indirect, that this system may or does cause
+ to the user's computational environment, including, but not
+ limited to, the user's hardware, software, network, or data.
+ The user further agrees to hold TundraWare Inc. harmless for
+ any economic damage or any other adverse consequence, direct
+ or indirect, caused by the use of the keypad system.
+
+ 4) Any distributed copies of the keypad system must include all
+ the contents originally provided in this keypad system
+ distribution unmodified in any way.
+
+ 5) Distribution of modified systems based on the keypad system,
+ hereafter called "derivative work", is permitted so long as:
+
+ a) The derivative work is packaged separately from the
+ keypad system provided by TundraWare Inc.
+
+ b) The distribution of the derivative work also includes
+ the original, unmodified TundraWare Inc. keypad
+ system release distribution upon which the derivative
+ work is based.
+
+ b) The derivative work clearly notes the fact that it
+ derives in part from the original keypad system.
+
+ 6) If duplicated and/or distributed, no fee beyond reasonable
+ duplication charges may be charged for the keypad system.
+
+ 7) This license is provided only for NON-COMMERCIAL use of the
+ keypad system. Under no circumstance may the keypad
+ system or derivative work based upon the keypad system be
+ used commercially (for pay or remuneration of any kind)
+ without separate licensing for such use by TundraWare Inc.
+
+
+If you do not understand, or cannot abide by any of these conditions,
+DO NOT USE the keypad system.
+
+To report bugs or suggest improvements, contact: tundra@tundraware.com
+
diff --git a/keypad.asm b/keypad.asm
new file mode 100644
index 0000000..f33ca0f
--- /dev/null
+++ b/keypad.asm
@@ -0,0 +1,558 @@
+;;; KEYPAD.ASM
+;;; Copyright (c) 2002, TundraWare Inc., All Rights Reserved
+;;;
+;;; Program to encode keypad presses into binary numbers
+;;;
+;;; $Id: keypad.asm,v 1.34 2002/06/18 16:44:33 tundra Exp tundra $
+
+
+;;;;;;;;;;
+;;; This code assumes the following keypad wiring to PORTB on the PIC:
+;;;
+;;; RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0
+;;; Col. Col. Col. Col. Row Row Row Row
+;;; 4 3 2 1 4 3 2 1
+;;;;;;;;;;
+
+ list p=16F84A
+ include <P16F84A.INC>
+
+ errorlevel -302 ;suppress bank selection messages
+ __config 3ff3h ;RC osc, WDT off
+ __idlocs 1234
+
+;;;;;;;;;;
+;;; Device Constants
+;;;;;;;;;;
+
+tmr2 equ 00H ; TMR0 prescaler constants
+tmr4 equ 01H
+tmr8 equ 02H
+tmr16 equ 03H
+tmr32 equ 04H
+tmr64 equ 05H
+tmr128 equ 06H
+tmr256 equ 07H
+
+
+;;;;;;;;;;
+;;; Circuit Constants
+;;;;;;;;;;
+
+KEYPAD equ PORTB
+OUTPUT equ PORTA
+PAR_SEL equ 4 ; bit used to select parallel/serial output
+PLATCH equ 4 ; parallel latch bit
+SCLK equ 1 ; serial clock out bit
+SDAT equ 0 ; serial data out bit
+SLATCH equ 2 ; serial latch bit
+TRISKEY equ TRISB
+TRISOUT equ TRISA
+
+; Constants used to Set TMR0 interrupt rate.
+; Adjust as needed using the following formula:
+;
+; I = T * TMR0_CNT * Prescaler Factor
+;
+; TMR0_PRIME is the value actually used to prime
+; TMR0 when restarting it - it counts *up* and
+; interrupts on overflow.
+;
+; The following TMR0 constants are approximately:
+;
+; (T) Internal Clock Interval: 3us
+; (I) TMR0 Interrupt Rate: 480us
+
+
+TMR0_CNT equ D'5'
+TMR0_PRE equ tmr32
+TMR0_PRIME equ D'256'-TMR0_CNT
+
+
+;;;;;;;;;;
+;;; Program Contants
+;;;;;;;;;;
+
+DEBOUNCE_COUNT equ 05h ; # times keyhit must be unchanged to be valid
+DEBOUNCE_TIME equ 0ah ; # TMR0 interrupts to wait between keyboard reads
+CLK_TIME equ 01h ; # TMR0 interrupts for serial clock true
+MAX_COL equ 04h ; # of columns on the keyboard
+NO_HIT equ 0fh ; bit pattern which means no key has been hit
+LATCH_TIME equ 01h ; # TMR0 interrupts to leave latch line true
+REPEAT_COUNT equ 03h ; scan delay =
+ ; REPEAT_COUNT * REPEAT_DELAY * TMR0 rate
+REPEAT_DELAY equ D'87'
+
+;;;;;;;;;;
+;;; Register File Assignments
+;;;;;;;;;;
+
+ CBLOCK 0cH
+ ; context save area
+
+ _fsr
+ _pclath
+ _status
+ _w
+
+ ; flags
+
+ par_out ; non-zero -> parallel out; zero -> serial out
+
+ ; variables
+
+ count
+ current_col
+ key_val
+ wait_count
+ ENDC
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+;;;;;;;;;;
+;;; Power-On Entry Point
+;;;;;;;;;;
+
+ org 00H
+ goto main
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;;;;;;;;;
+;;; Interrupt Handler
+;;;;;;;;;;
+
+ org 04H
+
+ movwf _w ; save context
+ movfw STATUS
+ bcf STATUS,RP1
+ bcf STATUS,RP0
+ movwf _status
+ movfw FSR
+ movwf _fsr
+ movfw PCLATH
+ movwf _pclath
+ clrf PCLATH
+
+ ; Figure out who interrupted and service it
+
+ btfsc INTCON,T0IF ; did we get a TMR0 interrupt?
+ goto tmr0_svc ; yup
+ goto restore_context ; no supported interrupt type found
+
+ ; TMR0 ISR
+tmr0_svc:
+ bcf INTCON,T0IF ; clear the interrupt condition
+ movlw TMR0_PRIME ; prime the counter
+ movwf TMR0
+
+ ; Update the wait timer if it is in use
+ ; Only do this on TMR0 interrupts so timing is predictable
+
+ movfw wait_count
+ btfss STATUS,Z ; non-zero count means 'in use'
+ decf wait_count,F ; decrement current count
+
+ ;;; End TMR0 ISR
+
+restore_context:
+ movfw _pclath ; restore entry context
+ movwf PCLATH
+ movfw _fsr
+ movwf FSR
+ movfw _status
+ movwf STATUS
+ swapf _w,F ; get W back w/o changing Z flag
+ swapf _w,W
+
+ retfie ; all done
+
+;;; End of interrupt handler
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+;;;;;;;;;;
+;;; Main program logic
+;;;;;;;;;;
+
+main:
+ call init ; initialize the system
+scan:
+ incf current_col,F ; pickup next column to scan
+ movlw MAX_COL+1 ; if current_col > MAX_COL then
+ subwf current_col,W ; we just did last column, so start over
+ btfss STATUS,Z ; zero means we need to start over
+ goto key_scan ; nope, go look for key hits
+ clrf current_col ; yes, reinit column counter
+ goto scan
+key_scan:
+ movfw current_col ; get bit pattern which
+ call col_select ; selects curently desired column
+ movwf KEYPAD ; and enable that column
+ movfw KEYPAD ; get keypad inputs
+ andlw 0fh ; only want row bits
+ addlw -NO_HIT ; see if key hit occured
+ btfsc STATUS,Z ; in current column
+ goto scan ; no, look at next column
+ call key_get ; yes, process ignore key releaseskeystroke
+ andlw 0fh ; there is bounce on a key *release*
+ addlw -NO_HIT ; as well as a key *press*
+ btfsc STATUS,Z ; we want to debounce key releases
+ goto scan ; (so they do not look like legit keystrokes)
+ ; but then we just ignore the release
+ call key_xlate ; legit keystroke - turn into binary value
+ call key_out ; and output it
+
+ ; introduce wait between keyboard scans to limit
+ ; key repeat rate
+
+ movlw REPEAT_COUNT
+ movwf count
+scan_delay:
+ movlw REPEAT_DELAY
+ call wait
+ decfsz count,F
+ goto scan_delay
+
+ goto scan ; scan forever
+
+;;; End of main logic
+
+
+ ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+ ;;;;;;;;;;
+ ;;; Data & Tables
+ ;;;;;;;;;;
+
+;;;;;;;;;;
+;;; Embedded Release & Copyright Information
+;;;;;;;;;;
+
+ DA "keypad.asm - $Revision: 1.34 $ - Copyright 2002, TundraWare Inc., All Rights Reserved."
+
+; End of Embedded Release & Copyright Information
+
+
+;;;;;;;;;;
+;;; Column selection bit patterns.
+;;;;;;;;;;
+
+col_select:
+ addwf PCL,F
+ DT b'11110000' ; placeholder, no column selected
+ DT b'11100000' ; column 1 selected
+ DT b'11010000' ; column 2 selected
+ DT b'10110000' ; column 3 selected
+ DT b'01110000' ; column 4 selected
+
+;;;;;;;;;;
+;;; Translate row/column selection pattern into equivalent binary value.
+;;; There is one subtable for each column. '*' is translated of 0eh and
+;;; '#' is translated to 0fh. This allows the entire keyboard to be
+;;; uniquely translated to 1 of 16 hex output values.
+;;;;;;;;;;
+
+col1_keys:
+ addwf PCL,F
+ DT 01h ; Row 1
+ DT 04h ; Row 2
+ DT 07h ; Row 3
+ DT 0eh ; Row 4
+col2_keys:
+ addwf PCL,F
+ DT 02h ; Row 1
+ DT 05h ; Row 2
+ DT 08h ; Row 3
+ DT 00h ; Row 4
+col3_keys:
+ addwf PCL,F
+ DT 03h ; Row 1
+ DT 06h ; Row 2
+ DT 09h ; Row 3
+ DT 0fh ; Row 4
+col4_keys:
+ addwf PCL,F
+ DT 0ah ; Row 1
+ DT 0b ; Row 2
+ DT 0c ; Row 3
+ DT 0dh ; Row 4
+
+
+;;;;;;;;;;
+;;; Translate a nibble bit pattern where an on bit means that row was selected
+;;; into an equivalent binary value for that row.
+;;;;;;;;;;
+
+bit2row:
+ addwf PCL,F
+ DT 00H ; placeholder, never used
+ DT 00H ; b'0001' => row 1
+ DT 01H ; b'0010' => row 2
+ DT 00H ; placeholder, never used
+ DT 02H ; b'0100' => row 3
+ DT 00H ; placeholder, never used
+ DT 00H ; placeholder, never used
+ DT 00H ; placeholder, never used
+ DT 03H ; b'1000' => row 4
+
+
+;;; End of translation tables
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+;;;;;;;;;;
+;;; Supporting Subroutines
+;;;;;;;;;;
+
+
+;;;;;;;;;;
+;;; Output current keystroke.
+;;; This routine supports both serial and parallel output modes,
+;;; which are selected at init time as follows:
+;;;
+;;; A4=0 ===> Serial Output
+;;; A4=1 ===> Parallel Output
+;;;;;;;;;;
+
+key_out:
+
+ movlw 0 ; clear W
+ addwf par_out,W ; if 0, we want serial output
+ btfsc STATUS,Z
+ goto serial_out
+
+ ; parallel output routine
+
+ movfw key_val ; load the value
+ movwf OUTPUT
+ bsf OUTPUT,PLATCH ; latch on
+ movlw LATCH_TIME
+ call wait
+ bcf OUTPUT,PLATCH ; latch off
+ return
+
+ ; serial output routine
+serial_out:
+ movlw 04h ; we have to shift out 4 bits LSB->MSB
+ movwf count
+shift_bit:
+ bcf OUTPUT,SDAT ; assume it's a 0
+ btfss key_val,0 ; see what it really is
+ goto clock_bit
+ bsf OUTPUT,SDAT ; nope, it was a 1
+clock_bit:
+ bsf OUTPUT,SCLK ; clock it out
+ movlw CLK_TIME
+ call wait
+ bcf OUTPUT,SCLK ; reset clock bit
+ decf count,F ; see if bits left to do
+ btfsc STATUS,Z
+ goto serial_latch ; all done
+ rrf key_val,F ; pickup next bit
+ goto shift_bit ; and move it
+
+ ; now latch the data out
+serial_latch:
+ bsf OUTPUT,SLATCH ; latch on
+ movlw LATCH_TIME
+ call wait
+ bcf OUTPUT,SLATCH ; latch off
+ return
+
+;;; End of 'key_out'
+
+
+;;;;;;;;;;
+;;; Read a debounced key from the keyboard.
+;;; Keep reading keyboard until the value has not changed
+;;; DEBOUNCE_COUNT times. Wait an interval of DEBOUNCE_TIME
+;;; between read attempts
+;;;;;;;;;;
+
+key_get:
+ movfw KEYPAD
+ movwf key_val
+debounce:
+ movlw DEBOUNCE_COUNT ; setup debounce counter
+ movwf count
+check_key:
+ movlw DEBOUNCE_TIME ; wait to let keyboard settle
+ call wait
+ movfw KEYPAD
+ subwf key_val,F ; see if matched last
+ btfsc STATUS,Z ; if Z, the values matched
+ goto matched
+ movwf key_val ; no match, start debounce cycle again
+ goto debounce
+matched:
+ movwf key_val ; save in case we have to do again
+ decfsz count,F ; see how many times left to go
+ goto check_key ; more matches to do
+
+ return ; got DEBOUNCE_COUNT matches - all done
+
+; End of 'key_get'
+
+
+;;;;;;;;;;
+;;; Translate the current keystroke into an equivalent binary value.
+;;;;;;;;;;
+
+key_xlate:
+ ; translate the hardware bit pattern indicating
+ ; which row was selected into an equivalent binary
+ ; row number. This will be used to index into
+ ; the translation table for the current column to
+ ; get the final binary value for that key.
+
+ comf key_val,W ; complement so only bit on corresponds
+ andlw 0fh ; to row selected - mask unused off
+ call bit2row ; translate it into a row number
+ movwf key_val ; save for use below
+
+ ; translate key value into equivalent binary value
+ ; using the appropriate translation table for the
+ ; current column
+
+ movfw current_col ; get current column
+ addlw -1 ; convert into an 0-relative offset
+ addwf PCL,F ; dispatch into the following jump table
+ goto col1_xlate
+ goto col2_xlate
+ goto col3_xlate
+ goto col4_xlate
+
+col1_xlate:
+ movfw key_val
+ call col1_keys
+ movwf key_val
+ return
+
+col2_xlate:
+ movfw key_val
+ call col2_keys
+ movwf key_val
+ return
+
+col3_xlate:
+ movfw key_val
+ call col3_keys
+ movwf key_val
+ return
+
+col4_xlate:
+ movfw key_val
+ call col4_keys
+ movwf key_val
+ return
+
+
+;;; End of 'key_xlate'
+
+
+;;;;;;;;;;
+;;; Generic wait routine.
+;;; Expects wait count to be passed in W.
+;;; Total wait time is thus W * TMR0 interrupt rate
+;;;;;;;;;;
+
+wait:
+ movwf wait_count
+waiting:
+ movfw wait_count ; wait until we countdown to 0
+ btfss STATUS,Z
+ goto waiting
+ return
+
+;;; End Of 'wait'
+
+
+;;;;;;;;;;
+;;; Initialize hardware and software at startup as needed.
+;;; Returns with register bank 0 selected.
+;;;;;;;;;;
+
+init:
+ clrf INTCON ; all interrupts off, flags cleared
+
+ ; determine whether we want serial or parallel output
+ ; and set flag accordingly for use later in the output routine
+
+ clrf par_out ; assume serial
+ btfsc OUTPUT,PAR_SEL ; if high - parallel out
+ comf par_out,F ; we want parallel output
+
+ ; Setup control registers
+
+ bsf STATUS,RP0 ; select register bank 1
+
+ ; setup output port with all bits output enabled
+
+ movlw b'11100000' ; set OUTPUT 0:4 as outputs
+ movwf TRISOUT ; (to output binary value of keypress)
+
+ ; Setup control registers
+
+ bsf STATUS,RP0 ; select register bank 1
+
+ ; setup keypad interface port
+
+ movlw b'00001111' ; KEYPAD high nibble set for output
+ ; (for column control)
+ movwf TRISKEY ; KEYPAD low nibble set for input
+ ; (to read rows)
+
+ ; setup TMR0 interrupt interval
+
+ clrf OPTION_REG ; TMR0: assign int. clock & prescaler
+ ; PORTB: weak pullups
+ movlw TMR0_PRE ; Set TMR0 prescale factor
+ iorwf OPTION_REG,F
+
+ bcf STATUS,RP0 ; select register bank 0
+
+ ; Prime the TMR0 countup counter
+
+ movlw TMR0_PRIME ; prime the counter
+ movwf TMR0
+
+ ; Intialize ports
+
+ clrf OUTPUT
+ clrf KEYPAD
+
+ ; Initialize variables
+
+ clrf current_col
+ clrf key_val
+ clrf count
+ clrf wait_count
+
+ ; Setup interrupt handling
+
+ bsf INTCON,T0IE ; enable TMR0 interrupt
+ bsf INTCON,GIE ; and turn interrupts back on
+
+ return
+
+;;; End of 'init'
+
+
+;;;;;;;;;;
+;;; EEPROM Contents
+;;;;;;;;;;
+
+ org 2100h
+
+ DE ""
+ END
+
diff --git a/keypad.brd b/keypad.brd
new file mode 100644
index 0000000..aaa0d15
--- /dev/null
+++ b/keypad.brd
Binary files differ
diff --git a/keypad.gif b/keypad.gif
new file mode 100644
index 0000000..da36777
--- /dev/null
+++ b/keypad.gif
Binary files differ
diff --git a/keypad.hex b/keypad.hex
new file mode 100644
index 0000000..6707c0d
--- /dev/null
+++ b/keypad.hex
@@ -0,0 +1,36 @@
+:020000040000FA
+:020000002028B6
+:080008008F00030803138312AB
+:100010008E0004088C000A088D008A010B19112833
+:1000200017280B11FB3081001408031D94030D08E1
+:100030008A000C0884000E0883008F0E0F0E090042
+:10004000DC20920A05301202031D28289201212883
+:1000500012086920860006080F39F13E031921288D
+:10006000AC200F39F13E03192128BC208D2003302C
+:1000700091005730D720910B39282128E535F03CE5
+:10008000E4306117ED392D1024106529693BE939F9
+:10009000EE37201DAE18B41924102D104310F03780
+:1000A000F23CE7347434321030182C195410EE3A04
+:1000B0007232D730F230A032EE24AE312016EC206E
+:1000C00020366929E833733A5210F332F232653B35
+:1000D0002E328207F034E034D034B03470348207EA
+:1000E0000134043407340E348207023405340834F2
+:1000F000003482070334063409340F3482070A348B
+:100100000B340C340D3482070034003401340034D5
+:100110000234003400340034033400301007031973
+:1001200098281308850005160130D720051208000D
+:10013000043091000510131C9E280514851401300D
+:10014000D720851091030319A728930C9A28051529
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+:100180001208FF3E8207C728CB28CF28D3281308A0
+:100190006F209300080013087420930008001308D0
+:1001A00079209300080013087E2093000800940033
+:1001B0001408031DD82808008B019001051A900926
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+:02400E00F33F7E
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diff --git a/keypad.lst b/keypad.lst
new file mode 100644
index 0000000..6f4d8e5
--- /dev/null
+++ b/keypad.lst
@@ -0,0 +1,806 @@
+MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 1
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00001 ;;; KEYPAD.ASM
+ 00002 ;;; Copyright (c) 2002, TundraWare Inc., All Rights Reserved
+ 00003 ;;;
+ 00004 ;;; Program to encode keypad presses into binary numbers
+ 00005 ;;;
+ 00006 ;;; $Id: keypad.asm,v 1.34 2002/06/18 16:44:33 tundra Exp tundra $
+ 00007
+ 00008
+ 00009 ;;;;;;;;;;
+ 00010 ;;; This code assumes the following keypad wiring to PORTB on the PIC:
+ 00011 ;;;
+ 00012 ;;; RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0
+ 00013 ;;; Col. Col. Col. Col. Row Row Row Row
+ 00014 ;;; 4 3 2 1 4 3 2 1
+ 00015 ;;;;;;;;;;
+ 00016
+ 00017 list p=16F84A
+ 00018 include <P16F84A.INC>
+ 00001 LIST
+ 00002 ; P16F84A.INC Standard Header File, Version 2.00 Microchip Technology, Inc.
+ 00134 LIST
+ 00019
+ 00020 errorlevel -302 ;suppress bank selection messages
+2007 3FF3 00021 __config 3ff3h ;RC osc, WDT off
+2000 0001 0002 0003 00022 __idlocs 1234
+ 0004
+ 00023
+ 00024 ;;;;;;;;;;
+ 00025 ;;; Device Constants
+ 00026 ;;;;;;;;;;
+ 00027
+ 00000000 00028 tmr2 equ 00H ; TMR0 prescaler constants
+ 00000001 00029 tmr4 equ 01H
+ 00000002 00030 tmr8 equ 02H
+ 00000003 00031 tmr16 equ 03H
+ 00000004 00032 tmr32 equ 04H
+ 00000005 00033 tmr64 equ 05H
+ 00000006 00034 tmr128 equ 06H
+ 00000007 00035 tmr256 equ 07H
+ 00036
+ 00037
+ 00038 ;;;;;;;;;;
+ 00039 ;;; Circuit Constants
+ 00040 ;;;;;;;;;;
+ 00041
+ 00000006 00042 KEYPAD equ PORTB
+ 00000005 00043 OUTPUT equ PORTA
+ 00000004 00044 PAR_SEL equ 4 ; bit used to select parallel/serial output
+ 00000004 00045 PLATCH equ 4 ; parallel latch bit
+ 00000001 00046 SCLK equ 1 ; serial clock out bit
+ 00000000 00047 SDAT equ 0 ; serial data out bit
+ 00000002 00048 SLATCH equ 2 ; serial latch bit
+ 00000086 00049 TRISKEY equ TRISB
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 2
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00000085 00050 TRISOUT equ TRISA
+ 00051
+ 00052 ; Constants used to Set TMR0 interrupt rate.
+ 00053 ; Adjust as needed using the following formula:
+ 00054 ;
+ 00055 ; I = T * TMR0_CNT * Prescaler Factor
+ 00056 ;
+ 00057 ; TMR0_PRIME is the value actually used to prime
+ 00058 ; TMR0 when restarting it - it counts *up* and
+ 00059 ; interrupts on overflow.
+ 00060 ;
+ 00061 ; The following TMR0 constants are approximately:
+ 00062 ;
+ 00063 ; (T) Internal Clock Interval: 3us
+ 00064 ; (I) TMR0 Interrupt Rate: 480us
+ 00065
+ 00066
+ 00000005 00067 TMR0_CNT equ D'5'
+ 00000004 00068 TMR0_PRE equ tmr32
+ 000000FB 00069 TMR0_PRIME equ D'256'-TMR0_CNT
+ 00070
+ 00071
+ 00072 ;;;;;;;;;;
+ 00073 ;;; Program Contants
+ 00074 ;;;;;;;;;;
+ 00075
+ 00000005 00076 DEBOUNCE_COUNT equ 05h ; # times keyhit must be unchanged to be valid
+ 0000000A 00077 DEBOUNCE_TIME equ 0ah ; # TMR0 interrupts to wait between keyboard reads
+ 00000001 00078 CLK_TIME equ 01h ; # TMR0 interrupts for serial clock true
+ 00000004 00079 MAX_COL equ 04h ; # of columns on the keyboard
+ 0000000F 00080 NO_HIT equ 0fh ; bit pattern which means no key has been hit
+ 00000001 00081 LATCH_TIME equ 01h ; # TMR0 interrupts to leave latch line true
+ 00000003 00082 REPEAT_COUNT equ 03h ; scan delay =
+ 00083 ; REPEAT_COUNT * REPEAT_DELAY * TMR0 rate
+ 00000057 00084 REPEAT_DELAY equ D'87'
+ 00085
+ 00086 ;;;;;;;;;;
+ 00087 ;;; Register File Assignments
+ 00088 ;;;;;;;;;;
+ 00089
+ 00090 CBLOCK 0cH
+ 00091 ; context save area
+ 00092
+ 0000000C 00093 _fsr
+ 0000000D 00094 _pclath
+ 0000000E 00095 _status
+ 0000000F 00096 _w
+ 00097
+ 00098 ; flags
+ 00099
+ 00000010 00100 par_out ; non-zero -> parallel out; zero -> serial out
+ 00101
+ 00102 ; variables
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 3
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00103
+ 00000011 00104 count
+ 00000012 00105 current_col
+ 00000013 00106 key_val
+ 00000014 00107 wait_count
+ 00108 ENDC
+ 00109
+ 00110
+ 00111 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00112
+ 00113
+ 00114 ;;;;;;;;;;
+ 00115 ;;; Power-On Entry Point
+ 00116 ;;;;;;;;;;
+ 00117
+0000 00118 org 00H
+0000 2820 00119 goto main
+ 00120
+ 00121 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00122
+ 00123 ;;;;;;;;;;
+ 00124 ;;; Interrupt Handler
+ 00125 ;;;;;;;;;;
+ 00126
+0004 00127 org 04H
+ 00128
+0004 008F 00129 movwf _w ; save context
+0005 0803 00130 movfw STATUS
+0006 1303 00131 bcf STATUS,RP1
+0007 1283 00132 bcf STATUS,RP0
+0008 008E 00133 movwf _status
+0009 0804 00134 movfw FSR
+000A 008C 00135 movwf _fsr
+000B 080A 00136 movfw PCLATH
+000C 008D 00137 movwf _pclath
+000D 018A 00138 clrf PCLATH
+ 00139
+ 00140 ; Figure out who interrupted and service it
+ 00141
+000E 190B 00142 btfsc INTCON,T0IF ; did we get a TMR0 interrupt?
+000F 2811 00143 goto tmr0_svc ; yup
+0010 2817 00144 goto restore_context ; no supported interrupt type found
+ 00145
+ 00146 ; TMR0 ISR
+0011 00147 tmr0_svc:
+0011 110B 00148 bcf INTCON,T0IF ; clear the interrupt condition
+0012 30FB 00149 movlw TMR0_PRIME ; prime the counter
+0013 0081 00150 movwf TMR0
+ 00151
+ 00152 ; Update the wait timer if it is in use
+ 00153 ; Only do this on TMR0 interrupts so timing is predictable
+ 00154
+0014 0814 00155 movfw wait_count
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 4
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+0015 1D03 00156 btfss STATUS,Z ; non-zero count means 'in use'
+0016 0394 00157 decf wait_count,F ; decrement current count
+ 00158
+ 00159 ;;; End TMR0 ISR
+ 00160
+0017 00161 restore_context:
+0017 080D 00162 movfw _pclath ; restore entry context
+0018 008A 00163 movwf PCLATH
+0019 080C 00164 movfw _fsr
+001A 0084 00165 movwf FSR
+001B 080E 00166 movfw _status
+001C 0083 00167 movwf STATUS
+001D 0E8F 00168 swapf _w,F ; get W back w/o changing Z flag
+001E 0E0F 00169 swapf _w,W
+ 00170
+001F 0009 00171 retfie ; all done
+ 00172
+ 00173 ;;; End of interrupt handler
+ 00174
+ 00175
+ 00176 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00177
+ 00178
+ 00179 ;;;;;;;;;;
+ 00180 ;;; Main program logic
+ 00181 ;;;;;;;;;;
+ 00182
+0020 00183 main:
+0020 20DC 00184 call init ; initialize the system
+0021 00185 scan:
+0021 0A92 00186 incf current_col,F ; pickup next column to scan
+0022 3005 00187 movlw MAX_COL+1 ; if current_col > MAX_COL then
+0023 0212 00188 subwf current_col,W ; we just did last column, so start over
+0024 1D03 00189 btfss STATUS,Z ; zero means we need to start over
+0025 2828 00190 goto key_scan ; nope, go look for key hits
+0026 0192 00191 clrf current_col ; yes, reinit column counter
+0027 2821 00192 goto scan
+0028 00193 key_scan:
+0028 0812 00194 movfw current_col ; get bit pattern which
+0029 2069 00195 call col_select ; selects curently desired column
+002A 0086 00196 movwf KEYPAD ; and enable that column
+002B 0806 00197 movfw KEYPAD ; get keypad inputs
+002C 390F 00198 andlw 0fh ; only want row bits
+002D 3EF1 00199 addlw -NO_HIT ; see if key hit occured
+002E 1903 00200 btfsc STATUS,Z ; in current column
+002F 2821 00201 goto scan ; no, look at next column
+0030 20AC 00202 call key_get ; yes, process ignore key releaseskeystroke
+0031 390F 00203 andlw 0fh ; there is bounce on a key *release*
+0032 3EF1 00204 addlw -NO_HIT ; as well as a key *press*
+0033 1903 00205 btfsc STATUS,Z ; we want to debounce key releases
+0034 2821 00206 goto scan ; (so they do not look like legit keystrokes)
+ 00207 ; but then we just ignore the release
+0035 20BC 00208 call key_xlate ; legit keystroke - turn into binary value
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 5
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+0036 208D 00209 call key_out ; and output it
+ 00210
+ 00211 ; introduce wait between keyboard scans to limit
+ 00212 ; key repeat rate
+ 00213
+0037 3003 00214 movlw REPEAT_COUNT
+0038 0091 00215 movwf count
+0039 00216 scan_delay:
+0039 3057 00217 movlw REPEAT_DELAY
+003A 20D7 00218 call wait
+003B 0B91 00219 decfsz count,F
+003C 2839 00220 goto scan_delay
+ 00221
+003D 2821 00222 goto scan ; scan forever
+ 00223
+ 00224 ;;; End of main logic
+ 00225
+ 00226
+ 00227 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00228
+ 00229
+ 00230 ;;;;;;;;;;
+ 00231 ;;; Data & Tables
+ 00232 ;;;;;;;;;;
+ 00233
+ 00234 ;;;;;;;;;;
+ 00235 ;;; Embedded Release & Copyright Information
+ 00236 ;;;;;;;;;;
+ 00237
+003E 35E5 3CF0 30E4 00238 DA "keypad.asm - $Revision: 1.34 $ - Copyright 2002, TundraWare Inc., All Rights Re
+ served."
+ 1761 39ED 102D
+ 1024 2965 3B69
+ 39E9 37EE 1D20
+ 18AE 19B4 1024
+ 102D 1043 37F0
+ 3CF2 34E7 3474
+ 1032 1830 192C
+ 1054 3AEE 3272
+ 30D7 30F2 32A0
+ 24EE 31AE 1620
+ 20EC 3620 2969
+ 33E8 3A73 1052
+ 32F3 32F2 3B65
+ 322E
+ 00239
+ 00240 ; End of Embedded Release & Copyright Information
+ 00241
+ 00242
+ 00243 ;;;;;;;;;;
+ 00244 ;;; Column selection bit patterns.
+ 00245 ;;;;;;;;;;
+ 00246
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 6
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+0069 00247 col_select:
+0069 0782 00248 addwf PCL,F
+006A 34F0 00249 DT b'11110000' ; placeholder, no column selected
+006B 34E0 00250 DT b'11100000' ; column 1 selected
+006C 34D0 00251 DT b'11010000' ; column 2 selected
+006D 34B0 00252 DT b'10110000' ; column 3 selected
+006E 3470 00253 DT b'01110000' ; column 4 selected
+ 00254
+ 00255 ;;;;;;;;;;
+ 00256 ;;; Translate row/column selection pattern into equivalent binary value.
+ 00257 ;;; There is one subtable for each column. '*' is translated of 0eh and
+ 00258 ;;; '#' is translated to 0fh. This allows the entire keyboard to be
+ 00259 ;;; uniquely translated to 1 of 16 hex output values.
+ 00260 ;;;;;;;;;;
+ 00261
+006F 00262 col1_keys:
+006F 0782 00263 addwf PCL,F
+0070 3401 00264 DT 01h ; Row 1
+0071 3404 00265 DT 04h ; Row 2
+0072 3407 00266 DT 07h ; Row 3
+0073 340E 00267 DT 0eh ; Row 4
+0074 00268 col2_keys:
+0074 0782 00269 addwf PCL,F
+0075 3402 00270 DT 02h ; Row 1
+0076 3405 00271 DT 05h ; Row 2
+0077 3408 00272 DT 08h ; Row 3
+0078 3400 00273 DT 00h ; Row 4
+0079 00274 col3_keys:
+0079 0782 00275 addwf PCL,F
+007A 3403 00276 DT 03h ; Row 1
+007B 3406 00277 DT 06h ; Row 2
+007C 3409 00278 DT 09h ; Row 3
+007D 340F 00279 DT 0fh ; Row 4
+007E 00280 col4_keys:
+007E 0782 00281 addwf PCL,F
+007F 340A 00282 DT 0ah ; Row 1
+0080 340B 00283 DT 0b ; Row 2
+0081 340C 00284 DT 0c ; Row 3
+0082 340D 00285 DT 0dh ; Row 4
+ 00286
+ 00287
+ 00288 ;;;;;;;;;;
+ 00289 ;;; Translate a nibble bit pattern where an on bit means that row was selected
+ 00290 ;;; into an equivalent binary value for that row.
+ 00291 ;;;;;;;;;;
+ 00292
+0083 00293 bit2row:
+0083 0782 00294 addwf PCL,F
+0084 3400 00295 DT 00H ; placeholder, never used
+0085 3400 00296 DT 00H ; b'0001' => row 1
+0086 3401 00297 DT 01H ; b'0010' => row 2
+0087 3400 00298 DT 00H ; placeholder, never used
+0088 3402 00299 DT 02H ; b'0100' => row 3
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 7
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+0089 3400 00300 DT 00H ; placeholder, never used
+008A 3400 00301 DT 00H ; placeholder, never used
+008B 3400 00302 DT 00H ; placeholder, never used
+008C 3403 00303 DT 03H ; b'1000' => row 4
+ 00304
+ 00305
+ 00306 ;;; End of translation tables
+ 00307
+ 00308
+ 00309 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ 00310
+ 00311
+ 00312 ;;;;;;;;;;
+ 00313 ;;; Supporting Subroutines
+ 00314 ;;;;;;;;;;
+ 00315
+ 00316
+ 00317 ;;;;;;;;;;
+ 00318 ;;; Output current keystroke.
+ 00319 ;;; This routine supports both serial and parallel output modes,
+ 00320 ;;; which are selected at init time as follows:
+ 00321 ;;;
+ 00322 ;;; A4=0 ===> Serial Output
+ 00323 ;;; A4=1 ===> Parallel Output
+ 00324 ;;;;;;;;;;
+ 00325
+008D 00326 key_out:
+ 00327
+008D 3000 00328 movlw 0 ; clear W
+008E 0710 00329 addwf par_out,W ; if 0, we want serial output
+008F 1903 00330 btfsc STATUS,Z
+0090 2898 00331 goto serial_out
+ 00332
+ 00333 ; parallel output routine
+ 00334
+0091 0813 00335 movfw key_val ; load the value
+0092 0085 00336 movwf OUTPUT
+0093 1605 00337 bsf OUTPUT,PLATCH ; latch on
+0094 3001 00338 movlw LATCH_TIME
+0095 20D7 00339 call wait
+0096 1205 00340 bcf OUTPUT,PLATCH ; latch off
+0097 0008 00341 return
+ 00342
+ 00343 ; serial output routine
+0098 00344 serial_out:
+0098 3004 00345 movlw 04h ; we have to shift out 4 bits LSB->MSB
+0099 0091 00346 movwf count
+009A 00347 shift_bit:
+009A 1005 00348 bcf OUTPUT,SDAT ; assume it's a 0
+009B 1C13 00349 btfss key_val,0 ; see what it really is
+009C 289E 00350 goto clock_bit
+009D 1405 00351 bsf OUTPUT,SDAT ; nope, it was a 1
+009E 00352 clock_bit:
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 8
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+009E 1485 00353 bsf OUTPUT,SCLK ; clock it out
+009F 3001 00354 movlw CLK_TIME
+00A0 20D7 00355 call wait
+00A1 1085 00356 bcf OUTPUT,SCLK ; reset clock bit
+00A2 0391 00357 decf count,F ; see if bits left to do
+00A3 1903 00358 btfsc STATUS,Z
+00A4 28A7 00359 goto serial_latch ; all done
+00A5 0C93 00360 rrf key_val,F ; pickup next bit
+00A6 289A 00361 goto shift_bit ; and move it
+ 00362
+ 00363 ; now latch the data out
+00A7 00364 serial_latch:
+00A7 1505 00365 bsf OUTPUT,SLATCH ; latch on
+00A8 3001 00366 movlw LATCH_TIME
+00A9 20D7 00367 call wait
+00AA 1105 00368 bcf OUTPUT,SLATCH ; latch off
+00AB 0008 00369 return
+ 00370
+ 00371 ;;; End of 'key_out'
+ 00372
+ 00373
+ 00374 ;;;;;;;;;;
+ 00375 ;;; Read a debounced key from the keyboard.
+ 00376 ;;; Keep reading keyboard until the value has not changed
+ 00377 ;;; DEBOUNCE_COUNT times. Wait an interval of DEBOUNCE_TIME
+ 00378 ;;; between read attempts
+ 00379 ;;;;;;;;;;
+ 00380
+00AC 00381 key_get:
+00AC 0806 00382 movfw KEYPAD
+00AD 0093 00383 movwf key_val
+00AE 00384 debounce:
+00AE 3005 00385 movlw DEBOUNCE_COUNT ; setup debounce counter
+00AF 0091 00386 movwf count
+00B0 00387 check_key:
+00B0 300A 00388 movlw DEBOUNCE_TIME ; wait to let keyboard settle
+00B1 20D7 00389 call wait
+00B2 0806 00390 movfw KEYPAD
+00B3 0293 00391 subwf key_val,F ; see if matched last
+00B4 1903 00392 btfsc STATUS,Z ; if Z, the values matched
+00B5 28B8 00393 goto matched
+00B6 0093 00394 movwf key_val ; no match, start debounce cycle again
+00B7 28AE 00395 goto debounce
+00B8 00396 matched:
+00B8 0093 00397 movwf key_val ; save in case we have to do again
+00B9 0B91 00398 decfsz count,F ; see how many times left to go
+00BA 28B0 00399 goto check_key ; more matches to do
+ 00400
+00BB 0008 00401 return ; got DEBOUNCE_COUNT matches - all done
+ 00402
+ 00403 ; End of 'key_get'
+ 00404
+ 00405
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 9
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00406 ;;;;;;;;;;
+ 00407 ;;; Translate the current keystroke into an equivalent binary value.
+ 00408 ;;;;;;;;;;
+ 00409
+00BC 00410 key_xlate:
+ 00411 ; translate the hardware bit pattern indicating
+ 00412 ; which row was selected into an equivalent binary
+ 00413 ; row number. This will be used to index into
+ 00414 ; the translation table for the current column to
+ 00415 ; get the final binary value for that key.
+ 00416
+00BC 0913 00417 comf key_val,W ; complement so only bit on corresponds
+00BD 390F 00418 andlw 0fh ; to row selected - mask unused off
+00BE 2083 00419 call bit2row ; translate it into a row number
+00BF 0093 00420 movwf key_val ; save for use below
+ 00421
+ 00422 ; translate key value into equivalent binary value
+ 00423 ; using the appropriate translation table for the
+ 00424 ; current column
+ 00425
+00C0 0812 00426 movfw current_col ; get current column
+00C1 3EFF 00427 addlw -1 ; convert into an 0-relative offset
+00C2 0782 00428 addwf PCL,F ; dispatch into the following jump table
+00C3 28C7 00429 goto col1_xlate
+00C4 28CB 00430 goto col2_xlate
+00C5 28CF 00431 goto col3_xlate
+00C6 28D3 00432 goto col4_xlate
+ 00433
+00C7 00434 col1_xlate:
+00C7 0813 00435 movfw key_val
+00C8 206F 00436 call col1_keys
+00C9 0093 00437 movwf key_val
+00CA 0008 00438 return
+ 00439
+00CB 00440 col2_xlate:
+00CB 0813 00441 movfw key_val
+00CC 2074 00442 call col2_keys
+00CD 0093 00443 movwf key_val
+00CE 0008 00444 return
+ 00445
+00CF 00446 col3_xlate:
+00CF 0813 00447 movfw key_val
+00D0 2079 00448 call col3_keys
+00D1 0093 00449 movwf key_val
+00D2 0008 00450 return
+ 00451
+00D3 00452 col4_xlate:
+00D3 0813 00453 movfw key_val
+00D4 207E 00454 call col4_keys
+00D5 0093 00455 movwf key_val
+00D6 0008 00456 return
+ 00457
+ 00458
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 10
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00459 ;;; End of 'key_xlate'
+ 00460
+ 00461
+ 00462 ;;;;;;;;;;
+ 00463 ;;; Generic wait routine.
+ 00464 ;;; Expects wait count to be passed in W.
+ 00465 ;;; Total wait time is thus W * TMR0 interrupt rate
+ 00466 ;;;;;;;;;;
+ 00467
+00D7 00468 wait:
+00D7 0094 00469 movwf wait_count
+00D8 00470 waiting:
+00D8 0814 00471 movfw wait_count ; wait until we countdown to 0
+00D9 1D03 00472 btfss STATUS,Z
+00DA 28D8 00473 goto waiting
+00DB 0008 00474 return
+ 00475
+ 00476 ;;; End Of 'wait'
+ 00477
+ 00478
+ 00479 ;;;;;;;;;;
+ 00480 ;;; Initialize hardware and software at startup as needed.
+ 00481 ;;; Returns with register bank 0 selected.
+ 00482 ;;;;;;;;;;
+ 00483
+00DC 00484 init:
+00DC 018B 00485 clrf INTCON ; all interrupts off, flags cleared
+ 00486
+ 00487 ; determine whether we want serial or parallel output
+ 00488 ; and set flag accordingly for use later in the output routine
+ 00489
+00DD 0190 00490 clrf par_out ; assume serial
+00DE 1A05 00491 btfsc OUTPUT,PAR_SEL ; if high - parallel out
+00DF 0990 00492 comf par_out,F ; we want parallel output
+ 00493
+ 00494 ; Setup control registers
+ 00495
+00E0 1683 00496 bsf STATUS,RP0 ; select register bank 1
+ 00497
+ 00498 ; setup output port with all bits output enabled
+ 00499
+00E1 30E0 00500 movlw b'11100000' ; set OUTPUT 0:4 as outputs
+00E2 0085 00501 movwf TRISOUT ; (to output binary value of keypress)
+ 00502
+ 00503 ; Setup control registers
+ 00504
+00E3 1683 00505 bsf STATUS,RP0 ; select register bank 1
+ 00506
+ 00507 ; setup keypad interface port
+ 00508
+00E4 300F 00509 movlw b'00001111' ; KEYPAD high nibble set for output
+ 00510 ; (for column control)
+00E5 0086 00511 movwf TRISKEY ; KEYPAD low nibble set for input
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 11
+
+
+LOC OBJECT CODE LINE SOURCE TEXT
+ VALUE
+
+ 00512 ; (to read rows)
+ 00513
+ 00514 ; setup TMR0 interrupt interval
+ 00515
+00E6 0181 00516 clrf OPTION_REG ; TMR0: assign int. clock & prescaler
+ 00517 ; PORTB: weak pullups
+00E7 3004 00518 movlw TMR0_PRE ; Set TMR0 prescale factor
+00E8 0481 00519 iorwf OPTION_REG,F
+ 00520
+00E9 1283 00521 bcf STATUS,RP0 ; select register bank 0
+ 00522
+ 00523 ; Prime the TMR0 countup counter
+ 00524
+00EA 30FB 00525 movlw TMR0_PRIME ; prime the counter
+00EB 0081 00526 movwf TMR0
+ 00527
+ 00528 ; Intialize ports
+ 00529
+00EC 0185 00530 clrf OUTPUT
+00ED 0186 00531 clrf KEYPAD
+ 00532
+ 00533 ; Initialize variables
+ 00534
+00EE 0192 00535 clrf current_col
+00EF 0193 00536 clrf key_val
+00F0 0191 00537 clrf count
+00F1 0194 00538 clrf wait_count
+ 00539
+ 00540 ; Setup interrupt handling
+ 00541
+00F2 168B 00542 bsf INTCON,T0IE ; enable TMR0 interrupt
+00F3 178B 00543 bsf INTCON,GIE ; and turn interrupts back on
+ 00544
+00F4 0008 00545 return
+ 00546
+ 00547 ;;; End of 'init'
+ 00548
+ 00549
+ 00550 ;;;;;;;;;;
+ 00551 ;;; EEPROM Contents
+ 00552 ;;;;;;;;;;
+ 00553
+2100 00554 org 2100h
+ 00555
+2100 00556 DE ""
+ 00557 END
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 12
+
+
+SYMBOL TABLE
+ LABEL VALUE
+
+C 00000000
+CLK_TIME 00000001
+DC 00000001
+DEBOUNCE_COUNT 00000005
+DEBOUNCE_TIME 0000000A
+EEADR 00000009
+EECON1 00000088
+EECON2 00000089
+EEDATA 00000008
+EEIE 00000006
+EEIF 00000004
+F 00000001
+FSR 00000004
+GIE 00000007
+INCFILES ../include
+INDF 00000000
+INTCON 0000000B
+INTE 00000004
+INTEDG 00000006
+INTF 00000001
+IRP 00000007
+KEYPAD 00000006
+LATCH_TIME 00000001
+MAX_COL 00000004
+NOT_PD 00000003
+NOT_RBPU 00000007
+NOT_TO 00000004
+NO_HIT 0000000F
+OPTION_REG 00000081
+OUTPUT 00000005
+PAR_SEL 00000004
+PCL 00000002
+PCLATH 0000000A
+PLATCH 00000004
+PORTA 00000005
+PORTB 00000006
+PS0 00000000
+PS1 00000001
+PS2 00000002
+PSA 00000003
+RBIE 00000003
+RBIF 00000000
+RD 00000000
+REPEAT_COUNT 00000003
+REPEAT_DELAY 00000057
+RP0 00000005
+RP1 00000006
+SCLK 00000001
+SDAT 00000000
+SLATCH 00000002
+STATUS 00000003
+T0CS 00000005
+T0IE 00000005
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 13
+
+
+SYMBOL TABLE
+ LABEL VALUE
+
+T0IF 00000002
+T0SE 00000004
+TMR0 00000001
+TMR0_CNT 00000005
+TMR0_PRE 00000004
+TMR0_PRIME 000000FB
+TRISA 00000085
+TRISB 00000086
+TRISKEY 00000086
+TRISOUT 00000085
+W 00000000
+WR 00000001
+WREN 00000002
+WRERR 00000003
+Z 00000002
+_CP_OFF 00003FFF
+_CP_ON 0000000F
+_HS_OSC 00003FFE
+_LP_OSC 00003FFC
+_PWRTE_OFF 00003FFF
+_PWRTE_ON 00003FF7
+_RC_OSC 00003FFF
+_WDT_OFF 00003FFB
+_WDT_ON 00003FFF
+_XT_OSC 00003FFD
+__16F84A 00000001
+_fsr 0000000C
+_pclath 0000000D
+_status 0000000E
+_w 0000000F
+bit2row 00000083
+check_key 000000B0
+clock_bit 0000009E
+col1_keys 0000006F
+col1_xlate 000000C7
+col2_keys 00000074
+col2_xlate 000000CB
+col3_keys 00000079
+col3_xlate 000000CF
+col4_keys 0000007E
+col4_xlate 000000D3
+col_select 00000069
+count 00000011
+current_col 00000012
+debounce 000000AE
+init 000000DC
+key_get 000000AC
+key_out 0000008D
+key_scan 00000028
+key_val 00000013
+key_xlate 000000BC
+main 00000020
+matched 000000B8
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 14
+
+
+SYMBOL TABLE
+ LABEL VALUE
+
+par_out 00000010
+restore_context 00000017
+scan 00000021
+scan_delay 00000039
+serial_latch 000000A7
+serial_out 00000098
+shift_bit 0000009A
+tmr0_svc 00000011
+tmr128 00000006
+tmr16 00000003
+tmr2 00000000
+tmr256 00000007
+tmr32 00000004
+tmr4 00000001
+tmr64 00000005
+tmr8 00000002
+wait 000000D7
+wait_count 00000014
+waiting 000000D8
+
+
+MEMORY USAGE MAP ('X' = Used, '-' = Unused)
+
+0000 : X---XXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX
+0040 : XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX
+0080 : XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX
+00C0 : XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXX XXXXX-----------
+2000 : XXXX---X-------- ---------------- ---------------- ----------------
+
+All other memory blocks unused.
+
+Program Memory Words Used: 242
+Program Memory Words Free: 782
+
+
+Errors : 0
+Warnings : 0 reported, 0 suppressed
+Messages : 0 reported, 4 suppressed
+
+
\ No newline at end of file
diff --git a/keypad.png b/keypad.png
new file mode 100644
index 0000000..321b197
--- /dev/null
+++ b/keypad.png
Binary files differ
diff --git a/keypad.ps b/keypad.ps
new file mode 100644
index 0000000..a39c1b1
--- /dev/null
+++ b/keypad.ps
@@ -0,0 +1,2689 @@
+%!PS-Adobe-1.0
+%%Title: EAGLE Drawing C:/USR/HOME/TUNDRA/DEV/PIC/KEYPAD/SCHEMA~1/keypad.sch
+%%Creator: EAGLE
+%%Pages: 1
+%%BoundingBox: 0 0 576 810
+%%EndComments
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+/inch { 72 mul } def
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+% Linestyle:
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+1 setlinecap
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+ stroke
+ } def
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+ } def
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+ d EU 0 EU rlineto
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+ newpath
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+ fill
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+/edge { 0.20710678119 mul } def
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+ /dy exch def
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+ /y exch def
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+ newpath
+ dx dy ge {
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+ x dx 2 div add EU y dy dx sub 2 div add dx edge add EU lineto
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+% the real drawing size:
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+
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+
+% are we going to rotate?:
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+/RotateDrawing 0 0 ne def
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+ /Courier findfont 12 scalefont setfont
+ mediawidth pagemargin sub h 1 setpage
+ newpath
+ 0 0 moveto
+ 0 h rlineto
+ mediawidth pagemargin sub 0 rlineto
+ 0 h neg rlineto
+ closepath
+ 5 setlinewidth
+ stroke
+ newpath 50 60 moveto (ERROR: Jobsize exceeds physical printing area!) show
+ newpath 50 40 moveto ( Job has been aborted!) show
+ showpage
+ stop
+ } def
+
+/SelectPage { % Select the page identified by Row and Column
+ /Column exch def
+ /Row exch def
+
+ % the actually exposed area (if the machine knows these parameters!):
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+ /DrawX MaxDrawX MinDrawX sub def
+ /DrawY MaxDrawY MinDrawY sub def
+ statusdict /setpage known
+ statusdict /mediawidth known and
+ statusdict /medialength known and
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+ MediaW DrawX sub 2 div 0 translate
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+ /Product product length string def
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+ product { dup 97 lt { 32 add } if Product exch i exch put /i i 1 add def } forall
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+ { pop pop } if
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+
+ % Linestyle:
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diff --git a/keypad.sch b/keypad.sch
new file mode 100644
index 0000000..eb7651b
--- /dev/null
+++ b/keypad.sch
Binary files differ
diff --git a/keypad.xrf b/keypad.xrf
new file mode 100644
index 0000000..3d47921
--- /dev/null
+++ b/keypad.xrf
@@ -0,0 +1,185 @@
+MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 1
+
+ MPASM Cross Reference File
+
+LABEL TYPE FILE NAME SOURCE FILE REFERENCES
+----- ---- --------- ----------------------
+
+C C P16F84A.INC 76*
+CLK_TIME C KEYPAD.ASM 78* 354.
+DC C P16F84A.INC 75*
+DEBOUNCE_COUNT C KEYPAD.ASM 76* 385.
+DEBOUNCE_TIME C KEYPAD.ASM 77* 388.
+EEADR C P16F84A.INC 57*
+EECON1 C P16F84A.INC 64*
+EECON2 C P16F84A.INC 65*
+EEDATA C P16F84A.INC 56*
+EEIE C P16F84A.INC 81*
+EEIF C P16F84A.INC 102*
+F C P16F84A.INC 45*
+FSR C KEYPAD.ASM 134. 165.
+ P16F84A.INC 53*
+GIE C KEYPAD.ASM 543.
+ P16F84A.INC 80*
+INCFILES M KEYPAD.ASM 0*
+INDF C P16F84A.INC 49*
+INTCON C KEYPAD.ASM 142. 148. 485. 542. 543.
+ P16F84A.INC 59*
+INTE C P16F84A.INC 83*
+INTEDG C P16F84A.INC 92*
+INTF C P16F84A.INC 86*
+IRP C P16F84A.INC 69*
+KEYPAD C KEYPAD.ASM 42* 196. 197. 382. 390. 531.
+LATCH_TIME C KEYPAD.ASM 81* 338. 366.
+MAX_COL C KEYPAD.ASM 79* 187.
+NOT_PD C P16F84A.INC 73*
+NOT_RBPU C P16F84A.INC 91*
+NOT_TO C P16F84A.INC 72*
+NO_HIT C KEYPAD.ASM 80* 199. 204.
+OPTION_REG C KEYPAD.ASM 516. 519.
+ P16F84A.INC 61*
+OUTPUT C KEYPAD.ASM 43* 336. 337. 340. 348. 351. 353. 356. 365. 368. 491. 530.
+PAR_SEL C KEYPAD.ASM 44* 491.
+PCL C KEYPAD.ASM 248. 263. 269. 275. 281. 294. 428.
+ P16F84A.INC 51*
+PCLATH C KEYPAD.ASM 136. 138. 163.
+ P16F84A.INC 58*
+PLATCH C KEYPAD.ASM 45* 337. 340.
+PORTA C KEYPAD.ASM 43.
+ P16F84A.INC 54*
+PORTB C KEYPAD.ASM 42.
+ P16F84A.INC 55*
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+PS1 C P16F84A.INC 97*
+PS2 C P16F84A.INC 96*
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+RBIE C P16F84A.INC 84*
+RBIF C P16F84A.INC 87*
+RD C P16F84A.INC 106*
+REPEAT_COUNT C KEYPAD.ASM 82* 214.
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 2
+
+ MPASM Cross Reference File
+
+LABEL TYPE FILE NAME SOURCE FILE REFERENCES
+----- ---- --------- ----------------------
+
+REPEAT_DELAY C KEYPAD.ASM 84* 217.
+RP0 C KEYPAD.ASM 132. 496. 505. 521.
+ P16F84A.INC 71*
+RP1 C KEYPAD.ASM 131.
+ P16F84A.INC 70*
+SCLK C KEYPAD.ASM 46* 353. 356.
+SDAT C KEYPAD.ASM 47* 348. 351.
+SLATCH C KEYPAD.ASM 48* 365. 368.
+STATUS C KEYPAD.ASM 130. 131. 132. 156. 167. 189. 200. 205. 330. 358. 392. 472. 496.
+ 505. 521.
+ P16F84A.INC 52*
+T0CS C P16F84A.INC 93*
+T0IE C KEYPAD.ASM 542.
+ P16F84A.INC 82*
+T0IF C KEYPAD.ASM 142. 148.
+ P16F84A.INC 85*
+T0SE C P16F84A.INC 94*
+TMR0 C KEYPAD.ASM 150. 526.
+ P16F84A.INC 50*
+TMR0_CNT C KEYPAD.ASM 67* 69.
+TMR0_PRE C KEYPAD.ASM 68* 518.
+TMR0_PRIME C KEYPAD.ASM 69* 149. 525.
+TRISA C KEYPAD.ASM 50.
+ P16F84A.INC 62*
+TRISB C KEYPAD.ASM 49.
+ P16F84A.INC 63*
+TRISKEY C KEYPAD.ASM 49* 511.
+TRISOUT C KEYPAD.ASM 50* 501.
+W C P16F84A.INC 44*
+WR C P16F84A.INC 105*
+WREN C P16F84A.INC 104*
+WRERR C P16F84A.INC 103*
+Z C KEYPAD.ASM 156. 189. 200. 205. 330. 358. 392. 472.
+ P16F84A.INC 74*
+_CP_OFF C P16F84A.INC 124*
+_CP_ON C P16F84A.INC 123*
+_HS_OSC C P16F84A.INC 131*
+_LP_OSC C P16F84A.INC 129*
+_PWRTE_OFF C P16F84A.INC 126*
+_PWRTE_ON C P16F84A.INC 125*
+_RC_OSC C P16F84A.INC 132*
+_WDT_OFF C P16F84A.INC 128*
+_WDT_ON C P16F84A.INC 127*
+_XT_OSC C P16F84A.INC 130*
+__16F84A V KEYPAD.ASM 17*
+ P16F84A.INC 34.
+_fsr C KEYPAD.ASM 93* 135. 164.
+_pclath C KEYPAD.ASM 94* 137. 162.
+_status C KEYPAD.ASM 95* 133. 166.
+_w C KEYPAD.ASM 96* 129. 168. 169.
+bit2row A KEYPAD.ASM 293* 419.
+check_key A KEYPAD.ASM 387* 399.
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 3
+
+ MPASM Cross Reference File
+
+LABEL TYPE FILE NAME SOURCE FILE REFERENCES
+----- ---- --------- ----------------------
+
+clock_bit A KEYPAD.ASM 350. 352*
+col1_keys A KEYPAD.ASM 262* 436.
+col1_xlate A KEYPAD.ASM 429. 434*
+col2_keys A KEYPAD.ASM 268* 442.
+col2_xlate A KEYPAD.ASM 430. 440*
+col3_keys A KEYPAD.ASM 274* 448.
+col3_xlate A KEYPAD.ASM 431. 446*
+col4_keys A KEYPAD.ASM 280* 454.
+col4_xlate A KEYPAD.ASM 432. 452*
+col_select A KEYPAD.ASM 195. 247*
+count C KEYPAD.ASM 104* 215. 219. 346. 357. 386. 398. 537.
+current_col C KEYPAD.ASM 105* 186. 188. 191. 194. 426. 535.
+debounce A KEYPAD.ASM 384* 395.
+init A KEYPAD.ASM 184. 484*
+key_get A KEYPAD.ASM 202. 381*
+key_out A KEYPAD.ASM 209. 326*
+key_scan A KEYPAD.ASM 190. 193*
+key_val C KEYPAD.ASM 106* 335. 349. 360. 383. 391. 394. 397. 417. 420. 435. 437. 441.
+ 443. 447. 449. 453. 455. 536.
+key_xlate A KEYPAD.ASM 208. 410*
+main A KEYPAD.ASM 119. 183*
+matched A KEYPAD.ASM 393. 396*
+par_out C KEYPAD.ASM 100* 329. 490. 492.
+restore_context A KEYPAD.ASM 144. 161*
+scan A KEYPAD.ASM 185* 192. 201. 206. 222.
+scan_delay A KEYPAD.ASM 216* 220.
+serial_latch A KEYPAD.ASM 359. 364*
+serial_out A KEYPAD.ASM 331. 344*
+shift_bit A KEYPAD.ASM 347* 361.
+tmr0_svc A KEYPAD.ASM 143. 147*
+tmr128 C KEYPAD.ASM 34*
+tmr16 C KEYPAD.ASM 31*
+tmr2 C KEYPAD.ASM 28*
+tmr256 C KEYPAD.ASM 35*
+tmr32 C KEYPAD.ASM 32* 68.
+tmr4 C KEYPAD.ASM 29*
+tmr64 C KEYPAD.ASM 33*
+tmr8 C KEYPAD.ASM 30*
+wait A KEYPAD.ASM 218. 339. 355. 367. 389. 468*
+wait_count C KEYPAD.ASM 107* 155. 157. 469. 471. 538.
+waiting A KEYPAD.ASM 470* 473.
+ MPASM 03.00 Released KEYPAD.ASM 6-18-2002 17:39:48 PAGE 4
+
+ MPASM Cross Reference File
+
+LABEL TYPE FILE NAME SOURCE FILE REFERENCES
+----- ---- --------- ----------------------
+
+
+
+LABEL TYPES
+-----------
+A Address
+C Constant
+E External
+M Macro
+S Segment
+U Unknown
+V Variable
+X Other
diff --git a/readme.txt b/readme.txt
new file mode 100644
index 0000000..653bfcf
--- /dev/null
+++ b/readme.txt
@@ -0,0 +1,230 @@
+keypad - Copyright (c) 2002 Tundraware Inc., All Rights Reserved
+$Id: readme.txt,v 1.4 2002/05/31 17:16:20 tundra Exp tundra $
+
+
+************************************************************************
+
+PLEASE NOTE: Before using anything in this archive, you must read, and
+ agree to abide by, the licensing terms found in:
+
+ keypad-license.txt
+
+************************************************************************
+
+
+FILE DESCRIPTIONS
+=================
+
+
+Makefile Unix-style makefile which runs under DJGPP and
+ should also work under MKS and Cygwin.
+
+readme.txt This file.
+
+keypad-license.txt Licensing terms for using this software.
+
+keypad.gif keypad schematic in GIF format.
+
+keypad.png keypad schematic in png format.
+
+keypad.ps keypad schematic in PostScript format.
+
+keypad.sch keypad schematic in Eagle format.
+
+keypad.brd keypad printed circuit board layout in Eagle format.
+
+keypad.asm keypad software written in PIC assembler.
+
+keypad.hex The assembled keypad software.
+
+keypad.lst keypad listing file generated by assembler.
+
+keypad.xrf keypad cross-reference file generated by assmbler.
+
+
+
+WHAT IS 'keypad'?
+==================
+
+
+'keypad' is a PIC based system for decoding switch matrix type numeric
+keypads with up to 4 rows and columns. The keypad switch matrix is
+read, and if a key is pressed, it is converted into an equivalent
+binary value (0-0fh) for output. Full debounce logic is included to
+suppress mechanical switch bounce effects.
+
+Output can either be a 4-bit parallel word or a serial clocked output.
+Both serial and parallel outputs support a "latching" pulse to drive
+external interface timing.
+
+
+ABOUT THE HARDWARE
+==================
+
+'keypad' is built around a very simple PIC 16F84 circuit. This
+circuit uses an RC oscillator because timing is not particularly
+critical in this application. The keypad hardware is connected to
+PORTB and output is found on PORTA. MCLR is pulled up so that noise
+does not reset the system. RA4 is pulled-up to allow for selection
+of serial or parallel output as described below.
+
+This release includes the schematic in a number of common formats.
+
+***VERY IMPORTANT NOTE***: The schematic shows *both* a crystal
+network and an RC network connected to OSC1/OSC2. This is intentional
+so that the resulting printed circuit board has provision for either a
+crystal or RC oscillator. However, you only use one *or* the other,
+never both. This approach allows one printed circuit board to be used
+in a variety of applications. In the case of 'keypad', the software
+assumes an RC network formed by R2 and C2. You do *not* use Q1, C3,
+or C4 at all. They should not be handwired into a circuit, nor should
+they be populated on the printed circuit board.
+
+
+ABOUT THE SOFTWARE
+==================
+
+NOTE: The 'keypad' code is pretty thoroughly commented and is a good
+ place to go to understand the details of just how this stuff
+ actually works.
+
+
+The 'keypad' software has 4 major elements:
+
+TMR0 Interrupt Routine - This creates a "heartbeat" clock with an
+ approximate period of 480us. This is used when
+ doing debounce waits and for timing the
+ output latching and serial clocking pulses.
+
+Mainline Code - After some initialization, the main code continuously
+ loops through each keypad column looking to see if a
+ key has been pressed. If so, it reads a debounced
+ version of the key, translates it into and equivalent
+ binary value and outputs the result either serially or
+ as a parallel nibble.
+
+Translation Tables - This code makes extensive use of translation
+ tables to pickup the various column selection bit
+ patterns and to translate key hit bit patterns
+ found on the keypad interface into equivalent
+ binary values for output.
+
+Supporting Subroutines - These are the various subroutines called by
+ the Mainline Code to initially setup the
+ hardware, and thereafter scan and process key
+ hits.
+
+
+The basic idea is that the column lines of the keypad are connected to
+PORTB 4:7 and the row lines are connected to PORTB 0:3. The column
+lines default to a logical high, and the row lines are pulled up to a
+logical high using the PIC weak pullup capabilities.
+
+'keypad' successively scans each keypad column by setting that
+column's control bit to low. Then, if a key is pressed in that
+column, it shorts the corresponding row/column lines together. Since
+the row line is pulled high with an internal weak pullup and the
+column line is low, this has the effect of pulling the row line low.
+By examining which column line is currently enabled (low) and which
+row line has been pulled low, 'keypad' can tell which key got pressed
+and then translate it into an equivalent binary value.
+
+It's not quite this simple, though, because mechanical switches
+"bounce" when they are pressed or released. The software has to wait
+until this bouncing is done before reading the keyboard interface or
+you will get bogus key press values. the 'key_get' routine in this
+software incorporates so-called "debounce" logic to avoid this
+problem. A key hit is not considered valid until it has remained
+unchanged DEBOUNCE_COUNT (5) times. The routine waits DEBOUNCE_TIME
+(10 * TMR0 interval = 4.8ms) between read attempts.
+
+During software intialization, the 'init' subroutine reads the
+hardware configuration to determine whether you want serial or
+parallel output. (See the next section on how to configure the
+hardware to do this.) Thereafter, it uses that output method. In
+other words, if you change the Serial/Parallel output selection while
+'keypad' is running, it will be ignored - you have to do a device
+reset to reread this configuration. The 'key_out' routine supports
+both serial and parallel output modes and checks a flag set during
+initialization to decide which one to use.
+
+
+HOW TO SELECT SERIAL/PARALLEL OUTPUT
+====================================
+
+'keypad' is capable of delivering the binary value of the key
+press as either a 4-bit parallel word *or* as a serial bit stream.
+
+To select parallel output:
+
+ Pull RA4 high *through a 10K resistor*.
+
+To select serial output:
+
+ Pull RA4 to ground (low).
+
+
+Parallel Bit Assignments:
+
+ RA0 - Bit 0 out
+ RA1 - Bit 1 out
+ RA2 - Bit 2 out
+ RA3 - Bit 3 out
+ RA4 - Latch out - Normally low. Goes high for
+ approximately 480us (LATCH_TIME * TMR0 interval)
+ when the word on A0:3 is valid.
+
+
+Serial Bit Assignments:
+
+ RA0 - Serial Data
+ RA1 - Serial Clock - Normally low. Goes high for
+ approximately 480us (CLK_TIME * TMR0 interval)
+ when bit on A0 is valid
+ RA2 - Latch out - Normally low. Goes high for
+ approximately 480us (LATCH_TIME * TMR0 interval)
+ when all bits in current value have been clocked out.
+ RA3 - Unused
+ RA4 - Unused
+
+
+USING 3- and 4-COLUMN KEYPADS
+=============================
+
+The 'keypad' code assumes 4x4 keypad. However it is trivial to use a
+3 column keypad (4x3). To use this smaller keypad, just don't connect
+anything to bit B7. To avoid noise, you probably should pull this
+pin high with a 10K resistor.
+
+You can also change the MAX_COL value to 3 in the code which will
+inhibit scanning for the 4th column. I prefer *not* to do this so
+that one PIC can handle both keypad types.
+
+
+MAPPING OF KEYPAD VALUES
+========================
+
+The numeric keys on the keypad are mapped to their equivalent
+binary values. The remaining keys are mapped as follows:
+
+R1C4 0ah
+R2C4 0bh
+R3C4 0ch
+R4C4 0dh
+R4C1 (*) 0eh
+R4C3 (#) 0fh
+
+If you don't like these assignments you can change them by modifying
+the 'colX_keys" translation tables, where 'X' is the column in
+question.
+
+
+BUGS
+====
+
+This is *experimental software* and has not been tested thorougly.
+It probably has bugs. If you find one, please let me know and
+I'll make the necessary changes.
+
+Happy Hacking!
+tundra@tundraware.com