1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
| ; dtmf.asm - tone decoder with relay control.
; reads output from an 8870 DTMF decoder and controls a bank of relays.
; 4 digit security code (abcd) precedes all commands
; Code sequences "*abcd11#" through to "*abcd18#" turn on the corresponding relay
; code sequence "*abcd10#" turns on all relays
; Code sequences "*abcd21#" through to "*abcd28#" turn off the corresponding relay
; Code sequence "*abcd20#" turns off all relays
; Codes "*abcd?9#" through "*abcd?D#" are ignored.\
; Note "oa" is used for "0" in security code not"00"
list p=16f84a
include "p16f84a.inc"
__FUSES _CP_OFF & _XT_OSC & _WDT_OFF & _PWRTE_ON
OPTREG equ 01
TRIS_A equ 05
TRIS_B equ 06
relays equ 10
mfcode equ 11
cntdown equ 12
timeout equ 13
slocnt1 equ 14
slocnt2 equ 15
numa equ 16
numb equ 17
numc equ 18
numd equ 19
org 0000 ;tell assembler to start at 000H
init goto start
org 0004 ;interrupt vector
rtc_interrupt
decfsz slocnt1,F ;decrement 1st prescaler
goto rtc_int_1
decfsz slocnt2,F ;decrement 2nd prescaler
goto rtc_int_1
bcf relays,4 ;turn relay 6 off
bcf PORTB,4
rtc_int_1
decfsz cntdown,F ;count down and skip next if = 0
goto counting ;still counting if not reached zero
bsf timeout,0 ;set timed out bit
bcf INTCON,2 ;clear interrupt flag
retfie ;return
counting
bcf timeout,0 ;clear timed out bit
bcf INTCON,2 ;clear interrupt flag
retfie ;return
; subroutines
wait_strobe
btfsc timeout,0 ;see if timed out
goto set_z ;set Z flag if timeout ocurred
btfss PORTA,4 ;see if Strobe is active on RA4
goto wait_strobe ;loop until it is
movfw PORTA ;retreive the code from the 8870
movwf mfcode ;store it in mfcode
bcf mfcode,4 ;ensure strobe isn't seen as data
bcf STATUS,2 ;return with Z=0 if tone decoded
return
set_z bsf STATUS,2 ;return with Z=1 if timed out waiting
return
wait_no_strobe
btfsc PORTA,4 ;see if strobe is active on RA4
goto wait_no_strobe ;loop until it isn't
return
start_timer
movlw H'54' ;software prescaler for 7 seconds
movwf cntdown
return
; Start of setup and decode routines:
start movlw B'00100000' ;select register page 1
movwf STATUS
clrf TRIS_B ;set all port B pins to output mode
movlw B'00011111' ;set all port A pins to input mode
movwf TRIS_A
movlw B'10000111'
movwf OPTREG ;sets: pull-up on port B OFF
; RTCC counts internal clock
; prescaler connected to RTCC
; prescaler divides by 256
; (other bits unimportant)
clrw ;clear the working register
movwf STATUS ;switch back to register page 0
clrf PORTB ;all outputs off
clrf relays
clrf timeout
movlw B'10100000'
movwf INTCON ;global and RTCC interrupts enabled
set_sec movlw H'01' ;put the 4 access codes into memory
movwf numa ;note for a 0 the hex is H'0A'
movlw H'02'
movwf numb
movlw H'03'
movwf numc
movlw H'04'
movwf numd
decode call wait_no_strobe ;start running when no tone present
clrf timeout ;set timeout condition until later
call wait_strobe ;wait for a tone to be received
movlw H'0B' ;0B is the code for DTMF "*"
subwf mfcode,W ;set zero flag if "*" was received
btfsc STATUS,2 ;skip next if it was not a "*"
goto got_star
goto decode ;look for another one
got_star
call start_timer ;start time-out timer
call wait_no_strobe ;wait for second tone
call wait_strobe
btfsc STATUS,2 ;abort if timed out
goto decode
movf numa,W
subwf mfcode,W ;set zero flag if second tone was 1
btfsc STATUS,2 ;skip next if it was not a 1
goto got_A
goto get_#
got_A call wait_no_strobe ;wait for third tone
call wait_strobe
btfsc STATUS,2 ;abort if timed out
goto decode
movf numb,W
subwf mfcode,W ;set zero flag if second tone was 1
btfsc STATUS,2 ;skip next if it was not a 1
goto got_B
goto get_#
got_B call wait_no_strobe ;wait for third tone
call wait_strobe
btfsc STATUS,2 ;abort if timed out
goto decode
movf numc,W
subwf mfcode,W ;set zero flag if second tone was 1
btfsc STATUS,2 ;skip next if it was not a 1
goto got_C
goto get_#
got_C call wait_no_strobe ;wait for third tone
call wait_strobe
btfsc STATUS,2 ;abort if timed out
goto decode
movf numd,W
subwf mfcode,W ;set zero flag if second tone was 1
btfsc STATUS,2 ;skip next if it was not a 1
goto got_D
goto get_#
got_D call wait_no_strobe ;wait for third tone
call wait_strobe
btfsc STATUS,2 ;abort if timed out
goto decode
movlw H'01'
subwf mfcode,W ;set zero flag if second tone was 1
btfsc STATUS,2 ;skip next if it was not a 1
goto got_1
movlw H'02'
subwf mfcode,W ;set zero flag if second tone was 0
btfsc STATUS,2 ;skip next if it was not a 0
goto got_2
goto get_# ;wait for # to end invalid sequence
; to reach here, the tone sequence "*<numa><numb><numc><numd>1" has been found, now decode request
; according to the next 2 tones but don't action it until a "#" is seen.
got_1 call wait_no_strobe
call wait_strobe ;wait for third tone
btfsc STATUS,2 ;abort if timed out
goto decode
call wait_no_strobe ;wait for tone to finish
movf mfcode,W ;pick up keyed digit
addwf PCL,F ;jump ahead to vector
goto decode ;5D (mf code 0000)
goto got_11
goto got_12
goto got_13
goto got_14
goto got_15
goto got_16
goto got_17
goto got_18
goto decode
goto got_10
goto decode ;*
goto decode ;#
goto decode ;5A
goto decode ;5B
goto decode ;5C (mf code 1111)
got_10 movlw B'11111111' ;all outputs on
movwf relays
goto get_#
got_11 bsf relays,0 ;set output 1 on
goto get_#
got_12 bsf relays,1 ;set output 2 on
goto get_#
got_13 bsf relays,3 ;set output 3 on
goto get_#
got_14 bsf relays,2 ;set output 4 on
goto get_#
got_15 bsf relays,5 ;set output 5 on
goto get_#
got_16 bsf relays,4 ;set output 6 on
goto get_#
got_17 bsf relays,6 ;set output 7 on
goto get_#
got_18 bsf relays,7 ;set output 8 on
goto get_#
; to reach here, the tone sequence "*<numa><numb><numc><numd>2" has been found, now decode request
; according to the next 2 tones but don't action it until a "#" is seen.
got_2 call wait_no_strobe
call wait_strobe ;wait for sixth tone
btfsc STATUS,2 ;abort if timed out
goto decode
call wait_no_strobe ;wait for tone to finish
movf mfcode,W ;pick up keyed digit
addwf PCL,F ;jump ahead to vector
goto decode ;5D (mf code 0000)
goto got_21
goto got_22
goto got_23
goto got_24
goto got_25
goto got_26
goto got_27
goto got_28
goto decode
goto got_20
goto decode ;*
goto decode ;#
goto decode ;5A
goto decode ;5B
goto decode ;5C (mf code 1111)
got_20 movlw B'0000000'
movwf relays ;set all outputs off
goto get_#
got_21 bcf relays,0 ;set output 1 off
goto get_#
got_22 bcf relays,1 ;set output 2 off
goto get_#
got_23 bcf relays,3 ;set output 3 off
goto get_#
got_24 bcf relays,2 ;set output 4 off
goto get_#
got_25 bcf relays,5 ;set output 5 Off
goto get_#
got_26 bcf relays,4 ;set output 6 Off
goto get_#
got_27 bcf relays,6 ;set output 7 Off
goto get_#
got_28 bcf relays,7 ;set output 8 Off
goto get_#
get_# call wait_strobe ;wait for 7th tone
btfsc STATUS,2 ;abort if timed out
goto decode
movlw H'0C' ;0C is the DTMF code for "#"
subwf mfcode,W ;if # received set Z flag
btfsc STATUS,2 ;skip next if not a #
goto got_#
call wait_no_strobe
goto get_# ;only # is valid, loop until found
;or timeout
got_# call wait_no_strobe ;wait for the tone to finish
movfw relays ;use the "relays" variable to set RB
movwf PORTB
goto decode ;all done, check for new sequence
retlw 'v'
retlw '1'
retlw '.'
retlw '3'
retlw '.'
retlw 'W'
retlw 'W'
retlw '2'
retlw 'R'
retlw ' '
retlw 'm'
retlw 'a'
retlw 'y'
retlw '2'
retlw '0'
retlw '0'
retlw '0'
end |
