Mercurial > public > mk2

annotate code_part1/OSTC_code_asm_part1/i2c_eeprom.asm @ 370:61742b3ef842 64kByte Logbook

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Merged with dive interval
author JeanDo
date Fri, 10 Jun 2011 01:31:39 +0200
parents 7250ca7c8d24
children a76c5a3e9e96
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
2 ; OSTC - diving computer code
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
3 ; Copyright (C) 2008 HeinrichsWeikamp GbR
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
4 ; This program is free software: you can redistribute it and/or modify
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
5 ; it under the terms of the GNU General Public License as published by
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
6 ; the Free Software Foundation, either version 3 of the License, or
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
7 ; (at your option) any later version.
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
8 ; This program is distributed in the hope that it will be useful,
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
9 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
10 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
11 ; GNU General Public License for more details.
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
12 ; You should have received a copy of the GNU General Public License
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
13 ; along with this program. If not, see <http://www.gnu.org/licenses/>.
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
14 ; provides routines for external EEPROM via I2C
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
15 ; written by: Matthias Heinrichs, info@heinrichsweikamp.com
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
16 ; written: 10/30/05
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
17 ; last updated: 08/21/06
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
18 ; known bugs:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
19 ; ToDo: use 2nd 32KB from external EEPROM for something
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
20
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
21 incf_eeprom_address macro ext_ee_temp1 ; Will increase eeprom_address:2 with the 8Bit value "ext_ee_temp1"
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
22 movlw ext_ee_temp1
148
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
23 call incf_eeprom_address0
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
24 endm
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
25
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
26 incf_eeprom_address0:
148
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
27 addwf eeprom_address+0,F ; increase address
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
28 movlw d'0'
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
29 addwfc eeprom_address+1,F
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
30 return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
31 ; btfss eeprom_address+1,7 ; at address 8000?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
32 ; return ; No, continue
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
33 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
34 ; ; Yes, clear eeprom_address:2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
35 ; clrf eeprom_address+0 ; Clear eeprom address
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
36 ; clrf eeprom_address+1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
37 ; return ; Done.
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
38 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
39 ;=============================================================================
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
40 ; Will decrease eeprom_address:2 with the 8Bit value "ext_ee_temp1"
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
41
148
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
42
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
43 decf_eeprom_address macro ext_ee_temp1
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
44 movlw ext_ee_temp1
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
45 call decf_eeprom_address0
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
46 endm
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
47
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
48 decf_eeprom_address0:
148
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
49 subwf eeprom_address+0,F ; decrease address: do a 16-8bits substract.
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
50 movlw d'0'
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
51 subwfb eeprom_address+1,F
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
52 return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
53 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
54 ; btfss eeprom_address+1,7 ; at address 8000?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
55 ; return ; No, done.
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
56 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
57 ; movlw b'01111111' ; yes, reset highbyte
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
58 ; movwf eeprom_address+1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
59 ; return ; Done.
148
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
60
055977afc2f9 Make loogbook search twice faster.
JeanDo
parents: 83
diff changeset
61 ;=============================================================================
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
62
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
63 write_external_eeprom: ; data in WREG
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
64 ; increase address eeprom_address+0:eeprom_address+1 after write
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
65 ; with banking after 7FFF
81
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
66 #ifdef TESTING
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
67 ; When Simulating with MPLabSIM, there is no way to emulate external EEPROM...
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
68 return
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
69 #endif
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
70
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
71 rcall I2CWRITE ; writes WREG into EEPROM@eeprom_address
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
72 movlw d'1' ; increase address
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
73 addwf eeprom_address+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
74 movlw d'0'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
75 addwfc eeprom_address+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
76 return
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
77 ; btfss eeprom_address+1,7 ; at address 8000?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
78 ; return ; no, return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
79 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
80 ; clrf eeprom_address+0 ; Clear eeprom address
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
81 ; clrf eeprom_address+1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
82 ; return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
83 ;
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
84 write_external_eeprom_block: ; Writes a block of 64Byte (one page in external EEPROM without stop condition
81
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
85 #ifdef TESTING
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
86 ; When Simulating with MPLabSIM, there is no way to emulate external EEPROM...
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
87 return
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
88 #endif
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
89
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
90 btfsc eeprom_blockwrite ; Blockwrite continue?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
91 rcall I2CWRITE_BLOCK2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
92 btfss eeprom_blockwrite ; Blockwrite start?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
93 rcall I2CWRITE_BLOCK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
94 bsf eeprom_blockwrite ; After the start, do blockwriting for the next 63Bytes!
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
95
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
96 movlw d'0' ; increase address
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
97 incf eeprom_address+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
98 addwfc eeprom_address+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
99 return
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
100
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
101 ; btfss eeprom_address+1,7 ; at address 8000
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
102 ; return ; no, return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
103 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
104 ; clrf eeprom_address+0 ; Clear eeprom address
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
105 ; clrf eeprom_address+1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
106 ; return
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
107 I2CWRITE_BLOCK:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
108 movwf ext_ee_temp1 ; Data byte in WREG
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
109 bsf SSPCON2,SEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
110 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
111 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
112 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
113 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
114 movwf SSPBUF ; control byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
115 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
116 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
117 movff eeprom_address+1,SSPBUF ; High Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
118 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
119 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
120 movff eeprom_address+0,SSPBUF ; Low Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
121 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
122 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
123 I2CWRITE_BLOCK2:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
124 movff ext_ee_temp1, SSPBUF ; Data Byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
125 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
126 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
127 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
128
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
129
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
130 get_free_EEPROM_location: ; Searches 0xFD, 0xFD, 0xFE and sets Pointer to 0xFE
81
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
131
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
132 #ifdef TESTING
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
133 ; In testing mode, find 0x100 (internal EEPROM) as the first free location...
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
134 clrf eeprom_address+0 ; Not found in entire EEPROM, set to address 0
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
135 movlw 0x1
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
136 movwf eeprom_address+1
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
137 return
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
138 #endif
31fa973a70fd Kludges to emulate inexisting devices when debugged with the MPLAB software SIMulator.
JeanDo
parents: 53
diff changeset
139
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
140 clrf ext_ee_temp1 ; low address counter
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
141 clrf ext_ee_temp2 ; high address counter
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
142 bcf second_FD ; clear flags
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
143 bcf first_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
144 get_free_EEPROM_location3:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
145 bsf SSPCON2, PEN ; Stop condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
146 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
147 bsf SSPCON2,SEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
148 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
149 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
150 btfss ext_ee_temp2,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
151 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
152 movwf SSPBUF ; control byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
153 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
154 btfsc SSPCON2,ACKSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
155 bra get_free_EEPROM_location3 ; EEPROM NOT acknowledged, retry!
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
156
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
157 movff ext_ee_temp2,SSPBUF ; High Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
158 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
159 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
160 movff ext_ee_temp1,SSPBUF ; Low Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
161 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
162 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
163
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
164 bsf SSPCON2,RSEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
165 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
166 movlw b'10101111' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
167 btfss ext_ee_temp2,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
168 movlw b'10100111' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
169 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
170 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
171 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
172
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
173 get_free_EEPROM_location2:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
174 bsf SSPCON2, RCEN ; Enable recieve mode
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
175 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
176 btfsc first_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
177 bra test_2nd_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
178 bsf first_FD ; found first 0xFD?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
179 movlw 0xFD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
180 cpfseq SSPBUF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
181 bcf first_FD ; No
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
182 bra get_free_EEPROM_location2c
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
183
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
184 test_2nd_FD:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
185 btfsc second_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
186 bra test_FE
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
187 bsf second_FD ; found second 0xFD?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
188 movlw 0xFD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
189 cpfseq SSPBUF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
190 bra get_free_EEPROM_location2b ;No, clear both flags
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
191 bra get_free_EEPROM_location2c
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
192 test_FE:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
193 movlw 0xFE ; found the final 0xFE?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
194 cpfseq SSPBUF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
195 bra get_free_EEPROM_location2b ;No, clear both flags
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
196 movff ext_ee_temp1,eeprom_address+0 ;Yes, copy ext_ee_temp1->eeprom_address+0 and
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
197 movff ext_ee_temp2,eeprom_address+1 ;ext_ee_temp2->eeprom_address+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
198 bra get_free_EEPROM_location4 ; Done.
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
199
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
200 get_free_EEPROM_location2b:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
201 bcf second_FD ; clear both flags!
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
202 bcf first_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
203 get_free_EEPROM_location2c:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
204 movlw d'1' ; and increase search address
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
205 addwf ext_ee_temp1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
206 movlw d'0'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
207 addwfc ext_ee_temp2,F
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
208
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
209 movlw 0xFF
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
210 cpfseq ext_ee_temp2 ; =0xFFFF
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
211 bra get_free_EEPROM_location2d ; No
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
212 cpfseq ext_ee_temp1 ; =0xFFFF
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
213 bra get_free_EEPROM_location2d ; No
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
214
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
215 bra get_free_EEPROM_location3b ; yes
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
216
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
217 get_free_EEPROM_location2d:
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
218 bsf SSPCON2, ACKEN ; no, send Ack
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
219 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
220 bra get_free_EEPROM_location2 ; and continue search
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
221 get_free_EEPROM_location3b:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
222 clrf eeprom_address+0 ; Not found in entire EEPROM, set to address 0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
223 clrf eeprom_address+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
224 get_free_EEPROM_location4:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
225 bsf SSPCON2, PEN ; Stop
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
226 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
227
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
228 bcf second_FD ; clear flags
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
229 bcf first_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
230 return ; return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
231
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
232
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
233 I2CREAD:
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
234 rcall I2CREAD_COMMON
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
235 bsf SSPCON2, PEN ; Stop
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
236 rcall WaitMSSP
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
237 return
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
238
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
239 I2CREAD2: ; same as I2CREAD but with automatic address increase
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
240 rcall I2CREAD
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
241 I2CREAD2_2:
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
242 movlw d'1'
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
243 addwf eeprom_address+0,F
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
244 movlw d'0'
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
245 addwfc eeprom_address+1,F
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
246 return
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
247 ; btfss eeprom_address+1,7 ; at 0x8000?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
248 ; return ; no, return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
249 ;
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
250 ; clrf eeprom_address+0 ; Yes, clear address
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
251 ; clrf eeprom_address+1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
252 ; return
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
253 ;
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
254 I2CREAD3: ; block read start with automatic address increase
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
255 rcall I2CREAD_COMMON
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
256 ; no Stop condition here
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
257 bra I2CREAD2_2
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
258
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
259 I2CREAD4: ; block read with automatic address increase
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
260 bsf SSPCON2,ACKEN ; Master acknowlegde
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
261 rcall WaitMSSP
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
262 bsf SSPCON2, RCEN ; Enable recieve mode
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
263 rcall WaitMSSP
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
264 movf SSPBUF,W ; copy read byte into WREG
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
265 ; no Stop condition here
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
266 bra I2CREAD2_2
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
267
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
268
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
269 I2CREAD_COMMON:
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
270 bsf SSPCON2, PEN ; Stop
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
271 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
272 bsf SSPCON2,SEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
273 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
274
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
275 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
276 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
277 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
278 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
279 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
280 btfsc SSPCON2,ACKSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
281 bra I2CREAD ; EEPROM NOT acknowledged, retry!
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
282 movff eeprom_address+1,SSPBUF ; High Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
283 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
284 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
285 movff eeprom_address+0,SSPBUF ; Low Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
286 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
287 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
288
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
289 bsf SSPCON2,RSEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
290 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
291
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
292 movlw b'10101111' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
293 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
294 movlw b'10100111' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
295 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
296 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
297 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
298
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
299 bsf SSPCON2, RCEN ; Enable recieve mode
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
300 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
301 movf SSPBUF,W ; copy read byte into WREG
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
302 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
303
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
304
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
305 I2CWRITE:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
306 movwf ext_ee_temp1 ; Data byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
307 bsf SSPCON2,SEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
308 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
309 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
310 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
311 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
312 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
313 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
314 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
315 movff eeprom_address+1,SSPBUF ; High Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
316 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
317 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
318 movff eeprom_address+0,SSPBUF ; Low Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
319 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
320 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
321 movff ext_ee_temp1, SSPBUF ; Data Byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
322 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
323 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
324 bsf SSPCON2,PEN ; Stop condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
325 rcall WaitMSSP
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
326 WAITMS d'5' ; Write delay
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
327 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
328
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
329 I2C_WaitforACK:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
330 btfsc SSPCON2,ACKSTAT ; checks for ACK bit from slave
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
331 rcall I2CFail
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
332 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
333
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
334 I2CFail:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
335 ostc_debug 'M' ; Sends debug-information to screen if debugmode active
21
73014f788032 1.60 stable rc1
heinrichsweikamp
parents: 0
diff changeset
336 bsf LED_red
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
337 rcall I2CReset ; I2C Reset
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
338 bcf PIR1,SSPIF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
339 clrf i2c_temp
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
340 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
341
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
342 WaitMSSP:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
343 decfsz i2c_temp,F ; check for timeout during I2C action
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
344 bra WaitMSSP2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
345 bra I2CFail ; timeout occured
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
346 WaitMSSP2:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
347 btfss PIR1,SSPIF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
348 bra WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
349 clrf i2c_temp
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
350 bcf PIR1,SSPIF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
351 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
352
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
353 I2CReset: ; Something went wrong (Slave holds SDA low?)
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
354 clrf SSPCON1 ; wake-up slave and reset entire module
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
355 ostc_debug 'N' ; Sends debug-information to screen if debugmode active
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
356 clrf SSPCON2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
357 clrf SSPSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
358 bcf TRISC,3 ; SCL OUTPUT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
359 bsf TRISC,4 ; SDA Input
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
360 bcf PORTC,3
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
361 movlw d'9'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
362 movwf i2c_temp ; clock-out 9 clock cycles manually
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
363 I2CReset_1:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
364 bsf PORTC,3 ; SCL=1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
365 nop
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
366 btfsc PORTC,4 ; SDA=1?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
367 bra I2CReset_2 ; =1, SDA has been released from slave
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
368 bcf PORTC,3 ; SCL=0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
369 bcf PORTC,3
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
370 decfsz i2c_temp,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
371 bra I2CReset_1 ; check for nine clock cycles
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
372 I2CReset_2:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
373 bsf TRISC,3 ; SCL Input
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
374 clrf SSPCON1 ; set I²C Mode
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
375 WAITMS d'10' ; Reset-Timeout for I2C devices
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
376 movlw b'00000000'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
377 movwf SSPSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
378 movlw b'00101000'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
379 movwf SSPCON1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
380 movlw b'00000000'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
381 movwf SSPCON2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
382 movlw d'8' ; 400kHz I2C clock @ 16MHz Fcy
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
383 movwf SSPADD
21
73014f788032 1.60 stable rc1
heinrichsweikamp
parents: 0
diff changeset
384 bcf LED_red
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
385 ostc_debug 'O' ; Sends debug-information to screen if debugmode active
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
386 return
53
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
387
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
388 ;I2C_TX:
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
389 ; movwf i2c_temp2 ; Data byte
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
390 ; bsf SSPCON2,SEN ; Start condition
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
391 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
392 ; movlw b'10010000' ; Bit0=0: WRITE, Bit0=1: READ
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
393 ; movwf SSPBUF ; control byte
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
394 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
395 ; rcall I2C_WaitforACK
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
396 ; movff i2c_temp2, SSPBUF ; Data Byte
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
397 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
398 ; rcall I2C_WaitforACK
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
399 ; bsf SSPCON2,PEN ; Stop condition
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
400 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
401 ; return
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
402 ;I2C_RX:
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
403 ; bcf PIR1,SSPIF
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
404 ; bsf SSPCON2,SEN ; Start condition
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
405 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
406 ; movlw b'10010001' ; Bit0=0: WRITE, Bit0=1: READ
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
407 ; movwf SSPBUF ; control byte
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
408 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
409 ; rcall I2C_WaitforACK
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
410 ; bsf SSPCON2, RCEN ; Enable recieve mode
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
411 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
412 ; movff SSPBUF,i2c_temp2 ; Data Byte
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
413 ; bsf SSPCON2,ACKEN ; Master acknowlegde
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
414 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
415 ; bsf SSPCON2,PEN ; Stop condition
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
416 ; rcall WaitMSSP
263348f83485 1.70 cleaning the code
heinrichsweikamp
parents: 42
diff changeset
417 ; return