Mercurial > public > mk2
annotate code_part1/OSTC_code_asm_part1/i2c_eeprom.asm @ 760:e16e636def61
2.74 release
author | heinrichsweikamp |
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date | Sun, 01 Dec 2013 10:33:12 +0100 |
parents | 16f4eafc197e |
children | c50296c3059e |
rev | line source |
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0 | 1 |
2 ; OSTC - diving computer code | |
3 ; Copyright (C) 2008 HeinrichsWeikamp GbR | |
4 ; This program is free software: you can redistribute it and/or modify | |
5 ; it under the terms of the GNU General Public License as published by | |
6 ; the Free Software Foundation, either version 3 of the License, or | |
7 ; (at your option) any later version. | |
8 ; This program is distributed in the hope that it will be useful, | |
9 ; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 ; GNU General Public License for more details. | |
12 ; You should have received a copy of the GNU General Public License | |
13 ; along with this program. If not, see <http://www.gnu.org/licenses/>. | |
14 ; provides routines for external EEPROM via I2C | |
15 ; written by: Matthias Heinrichs, info@heinrichsweikamp.com | |
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16 ; written: 051030 |
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17 ; last updated: 120421 |
0 | 18 ; known bugs: |
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19 ; ToDo: |
0 | 20 |
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21 incf_eeprom_address macro ext_ee_temp1 ; Will increase eeprom_address:2 with the 8Bit value "ext_ee_temp1" |
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22 movlw ext_ee_temp1 |
148 | 23 call incf_eeprom_address0 |
0 | 24 endm |
25 | |
26 incf_eeprom_address0: | |
148 | 27 addwf eeprom_address+0,F ; increase address |
28 movlw d'0' | |
29 addwfc eeprom_address+1,F | |
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30 return |
425 | 31 |
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32 ;============================================================================= |
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33 ; Will decrease eeprom_address:2 with the 8Bit value "ext_ee_temp1" |
0 | 34 |
148 | 35 |
36 decf_eeprom_address macro ext_ee_temp1 | |
37 movlw ext_ee_temp1 | |
38 call decf_eeprom_address0 | |
39 endm | |
0 | 40 |
41 decf_eeprom_address0: | |
148 | 42 subwf eeprom_address+0,F ; decrease address: do a 16-8bits substract. |
43 movlw d'0' | |
44 subwfb eeprom_address+1,F | |
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45 return |
148 | 46 |
47 ;============================================================================= | |
0 | 48 |
49 write_external_eeprom: ; data in WREG | |
50 ; increase address eeprom_address+0:eeprom_address+1 after write | |
51 ; with banking after 7FFF | |
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52 #ifdef TESTING |
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53 ; When Simulating with MPLabSIM, there is no way to emulate external EEPROM... |
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54 return |
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55 #endif |
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56 |
0 | 57 rcall I2CWRITE ; writes WREG into EEPROM@eeprom_address |
58 movlw d'1' ; increase address | |
59 addwf eeprom_address+0,F | |
60 movlw d'0' | |
61 addwfc eeprom_address+1,F | |
62 return | |
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63 |
0 | 64 write_external_eeprom_block: ; Writes a block of 64Byte (one page in external EEPROM without stop condition |
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65 #ifdef TESTING |
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66 ; When Simulating with MPLabSIM, there is no way to emulate external EEPROM... |
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67 return |
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68 #endif |
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69 |
0 | 70 btfsc eeprom_blockwrite ; Blockwrite continue? |
71 rcall I2CWRITE_BLOCK2 | |
72 btfss eeprom_blockwrite ; Blockwrite start? | |
73 rcall I2CWRITE_BLOCK | |
74 bsf eeprom_blockwrite ; After the start, do blockwriting for the next 63Bytes! | |
75 | |
76 movlw d'0' ; increase address | |
77 incf eeprom_address+0,F | |
78 addwfc eeprom_address+1,F | |
79 return | |
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80 |
0 | 81 I2CWRITE_BLOCK: |
82 movwf ext_ee_temp1 ; Data byte in WREG | |
83 bsf SSPCON2,SEN ; Start condition | |
84 rcall WaitMSSP | |
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85 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2 |
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86 btfss eeprom_address+1,7 ; Access Block2? |
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87 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1 |
0 | 88 movwf SSPBUF ; control byte |
89 rcall WaitMSSP | |
90 rcall I2C_WaitforACK | |
91 movff eeprom_address+1,SSPBUF ; High Address byte | |
92 rcall WaitMSSP | |
93 rcall I2C_WaitforACK | |
94 movff eeprom_address+0,SSPBUF ; Low Address byte | |
95 rcall WaitMSSP | |
96 rcall I2C_WaitforACK | |
97 I2CWRITE_BLOCK2: | |
98 movff ext_ee_temp1, SSPBUF ; Data Byte | |
99 rcall WaitMSSP | |
100 rcall I2C_WaitforACK | |
101 return | |
102 | |
103 | |
104 get_free_EEPROM_location: ; Searches 0xFD, 0xFD, 0xFE and sets Pointer to 0xFE | |
81
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105 |
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106 #ifdef TESTING |
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107 ; In testing mode, find 0x100 (internal EEPROM) as the first free location... |
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108 clrf eeprom_address+0 ; Not found in entire EEPROM, set to address 0 |
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109 movlw 0x1 |
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110 movwf eeprom_address+1 |
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111 return |
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112 #endif |
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113 |
0 | 114 clrf ext_ee_temp1 ; low address counter |
115 clrf ext_ee_temp2 ; high address counter | |
116 bcf second_FD ; clear flags | |
117 bcf first_FD | |
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118 bcf eeprom_switched_b1 |
0 | 119 get_free_EEPROM_location3: |
120 bsf SSPCON2, PEN ; Stop condition | |
121 rcall WaitMSSP | |
122 bsf SSPCON2,SEN ; Start condition | |
123 rcall WaitMSSP | |
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124 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2 |
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125 btfss ext_ee_temp2,7 ; Access Block2? |
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126 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1 |
0 | 127 movwf SSPBUF ; control byte |
128 rcall WaitMSSP | |
129 btfsc SSPCON2,ACKSTAT | |
130 bra get_free_EEPROM_location3 ; EEPROM NOT acknowledged, retry! | |
131 | |
132 movff ext_ee_temp2,SSPBUF ; High Address byte | |
133 rcall WaitMSSP | |
134 rcall I2C_WaitforACK | |
135 movff ext_ee_temp1,SSPBUF ; Low Address byte | |
136 rcall WaitMSSP | |
137 rcall I2C_WaitforACK | |
138 | |
139 bsf SSPCON2,RSEN ; Start condition | |
140 rcall WaitMSSP | |
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141 movlw b'10101111' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2 |
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142 btfss ext_ee_temp2,7 ; Access Block2? |
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143 movlw b'10100111' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1 |
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144 movwf SSPBUF ; control byte |
0 | 145 rcall WaitMSSP |
146 rcall I2C_WaitforACK | |
147 | |
148 get_free_EEPROM_location2: | |
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149 btfsc eeprom_switched_b1 ; Switched to Block1 already? |
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150 bra get_free_EEPROM_location2_x ; Yes, skip this check! |
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151 |
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152 btfsc ext_ee_temp2,7 ; Access Block1? |
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153 bsf eeprom_switched_b1 ; Yes, and set the flag so this check is skipped in the rest of this routine |
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154 btfsc ext_ee_temp2,7 ; Access Block1? |
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155 bra get_free_EEPROM_location3 ; Yes, initiate new read sequence in block1 |
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156 |
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157 get_free_EEPROM_location2_x: |
0 | 158 bsf SSPCON2, RCEN ; Enable recieve mode |
159 rcall WaitMSSP | |
160 btfsc first_FD | |
161 bra test_2nd_FD | |
162 bsf first_FD ; found first 0xFD? | |
163 movlw 0xFD | |
164 cpfseq SSPBUF | |
165 bcf first_FD ; No | |
166 bra get_free_EEPROM_location2c | |
167 | |
168 test_2nd_FD: | |
169 btfsc second_FD | |
170 bra test_FE | |
171 bsf second_FD ; found second 0xFD? | |
172 movlw 0xFD | |
173 cpfseq SSPBUF | |
174 bra get_free_EEPROM_location2b ;No, clear both flags | |
175 bra get_free_EEPROM_location2c | |
176 test_FE: | |
177 movlw 0xFE ; found the final 0xFE? | |
178 cpfseq SSPBUF | |
179 bra get_free_EEPROM_location2b ;No, clear both flags | |
180 movff ext_ee_temp1,eeprom_address+0 ;Yes, copy ext_ee_temp1->eeprom_address+0 and | |
181 movff ext_ee_temp2,eeprom_address+1 ;ext_ee_temp2->eeprom_address+1 | |
182 bra get_free_EEPROM_location4 ; Done. | |
183 | |
184 get_free_EEPROM_location2b: | |
185 bcf second_FD ; clear both flags! | |
186 bcf first_FD | |
187 get_free_EEPROM_location2c: | |
188 movlw d'1' ; and increase search address | |
189 addwf ext_ee_temp1,F | |
190 movlw d'0' | |
191 addwfc ext_ee_temp2,F | |
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192 |
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193 movlw 0xFF |
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194 cpfseq ext_ee_temp2 ; =0xFFFF |
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195 bra get_free_EEPROM_location2d ; No |
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196 cpfseq ext_ee_temp1 ; =0xFFFF |
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197 bra get_free_EEPROM_location2d ; No |
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198 |
0 | 199 bra get_free_EEPROM_location3b ; yes |
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200 |
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201 get_free_EEPROM_location2d: |
0 | 202 bsf SSPCON2, ACKEN ; no, send Ack |
203 rcall WaitMSSP | |
204 bra get_free_EEPROM_location2 ; and continue search | |
205 get_free_EEPROM_location3b: | |
206 clrf eeprom_address+0 ; Not found in entire EEPROM, set to address 0 | |
207 clrf eeprom_address+1 | |
208 get_free_EEPROM_location4: | |
209 bsf SSPCON2, PEN ; Stop | |
210 rcall WaitMSSP | |
211 | |
212 bcf second_FD ; clear flags | |
213 bcf first_FD | |
214 return ; return | |
215 | |
216 | |
217 I2CREAD: | |
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218 rcall I2CREAD_COMMON |
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219 bsf SSPCON2, PEN ; Stop |
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220 rcall WaitMSSP |
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221 return |
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222 |
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223 I2CREAD2: ; same as I2CREAD but with automatic address increase |
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224 rcall I2CREAD |
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225 I2CREAD2_2: |
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226 movlw d'1' |
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227 addwf eeprom_address+0,F |
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228 movlw d'0' |
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229 addwfc eeprom_address+1,F |
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230 return |
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231 I2CREAD3: ; block read start with automatic address increase |
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232 rcall I2CREAD_COMMON |
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233 ; no Stop condition here |
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234 bra I2CREAD2_2 |
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235 |
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236 I2CREAD4: ; block read with automatic address increase |
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237 bsf SSPCON2,ACKEN ; Master acknowlegde |
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238 rcall WaitMSSP |
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239 bsf SSPCON2, RCEN ; Enable recieve mode |
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240 rcall WaitMSSP |
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241 movf SSPBUF,W ; copy read byte into WREG |
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242 ; no Stop condition here |
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243 bra I2CREAD2_2 |
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244 |
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245 |
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246 I2CREAD_COMMON: |
0 | 247 bsf SSPCON2, PEN ; Stop |
248 rcall WaitMSSP | |
249 bsf SSPCON2,SEN ; Start condition | |
250 rcall WaitMSSP | |
350
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251 |
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252 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2 |
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253 btfss eeprom_address+1,7 ; Access Block2? |
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254 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1 |
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255 movwf SSPBUF ; control byte |
0 | 256 rcall WaitMSSP |
257 btfsc SSPCON2,ACKSTAT | |
258 bra I2CREAD ; EEPROM NOT acknowledged, retry! | |
259 movff eeprom_address+1,SSPBUF ; High Address byte | |
260 rcall WaitMSSP | |
261 rcall I2C_WaitforACK | |
262 movff eeprom_address+0,SSPBUF ; Low Address byte | |
263 rcall WaitMSSP | |
264 rcall I2C_WaitforACK | |
265 | |
266 bsf SSPCON2,RSEN ; Start condition | |
267 rcall WaitMSSP | |
350
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268 |
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269 movlw b'10101111' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2 |
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270 btfss eeprom_address+1,7 ; Access Block2? |
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271 movlw b'10100111' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1 |
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272 movwf SSPBUF ; control byte |
0 | 273 rcall WaitMSSP |
274 rcall I2C_WaitforACK | |
275 | |
276 bsf SSPCON2, RCEN ; Enable recieve mode | |
277 rcall WaitMSSP | |
278 movf SSPBUF,W ; copy read byte into WREG | |
279 return | |
280 | |
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281 |
0 | 282 I2CWRITE: |
283 movwf ext_ee_temp1 ; Data byte | |
284 bsf SSPCON2,SEN ; Start condition | |
285 rcall WaitMSSP | |
350
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286 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2 |
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287 btfss eeprom_address+1,7 ; Access Block2? |
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288 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1 |
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289 movwf SSPBUF ; control byte |
0 | 290 rcall WaitMSSP |
291 rcall I2C_WaitforACK | |
292 movff eeprom_address+1,SSPBUF ; High Address byte | |
293 rcall WaitMSSP | |
294 rcall I2C_WaitforACK | |
295 movff eeprom_address+0,SSPBUF ; Low Address byte | |
296 rcall WaitMSSP | |
297 rcall I2C_WaitforACK | |
298 movff ext_ee_temp1, SSPBUF ; Data Byte | |
299 rcall WaitMSSP | |
300 rcall I2C_WaitforACK | |
301 bsf SSPCON2,PEN ; Stop condition | |
302 rcall WaitMSSP | |
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303 WAITMS d'5' ; Write delay |
0 | 304 return |
305 | |
306 I2C_WaitforACK: | |
307 btfsc SSPCON2,ACKSTAT ; checks for ACK bit from slave | |
308 rcall I2CFail | |
309 return | |
310 | |
311 I2CFail: | |
312 ostc_debug 'M' ; Sends debug-information to screen if debugmode active | |
21 | 313 bsf LED_red |
0 | 314 rcall I2CReset ; I2C Reset |
315 bcf PIR1,SSPIF | |
316 clrf i2c_temp | |
317 return | |
318 | |
319 WaitMSSP: | |
320 decfsz i2c_temp,F ; check for timeout during I2C action | |
321 bra WaitMSSP2 | |
322 bra I2CFail ; timeout occured | |
323 WaitMSSP2: | |
324 btfss PIR1,SSPIF | |
595 | 325 bra WaitMSSP |
0 | 326 clrf i2c_temp |
327 bcf PIR1,SSPIF | |
595 | 328 nop |
0 | 329 return |
330 | |
331 I2CReset: ; Something went wrong (Slave holds SDA low?) | |
332 clrf SSPCON1 ; wake-up slave and reset entire module | |
333 ostc_debug 'N' ; Sends debug-information to screen if debugmode active | |
334 clrf SSPCON2 | |
335 clrf SSPSTAT | |
336 bcf TRISC,3 ; SCL OUTPUT | |
337 bsf TRISC,4 ; SDA Input | |
338 bcf PORTC,3 | |
339 movlw d'9' | |
340 movwf i2c_temp ; clock-out 9 clock cycles manually | |
341 I2CReset_1: | |
342 bsf PORTC,3 ; SCL=1 | |
343 nop | |
539 | 344 nop |
345 nop | |
346 nop | |
0 | 347 btfsc PORTC,4 ; SDA=1? |
539 | 348 bra I2CReset_2 ; =1, SDA has been released from slave |
0 | 349 bcf PORTC,3 ; SCL=0 |
539 | 350 nop |
351 nop | |
0 | 352 bcf PORTC,3 |
539 | 353 nop |
354 nop | |
0 | 355 decfsz i2c_temp,F |
356 bra I2CReset_1 ; check for nine clock cycles | |
357 I2CReset_2: | |
358 bsf TRISC,3 ; SCL Input | |
359 clrf SSPCON1 ; set I²C Mode | |
360 WAITMS d'10' ; Reset-Timeout for I2C devices | |
537 | 361 movlw SSPSTAT_VALUE |
0 | 362 movwf SSPSTAT |
363 movlw b'00101000' | |
364 movwf SSPCON1 | |
365 movlw b'00000000' | |
366 movwf SSPCON2 | |
537 | 367 movlw SSPADD_VALUE |
0 | 368 movwf SSPADD |
21 | 369 bcf LED_red |
0 | 370 ostc_debug 'O' ; Sends debug-information to screen if debugmode active |
371 return | |
53 | 372 |
373 ;I2C_TX: | |
374 ; movwf i2c_temp2 ; Data byte | |
375 ; bsf SSPCON2,SEN ; Start condition | |
376 ; rcall WaitMSSP | |
377 ; movlw b'10010000' ; Bit0=0: WRITE, Bit0=1: READ | |
378 ; movwf SSPBUF ; control byte | |
379 ; rcall WaitMSSP | |
380 ; rcall I2C_WaitforACK | |
381 ; movff i2c_temp2, SSPBUF ; Data Byte | |
382 ; rcall WaitMSSP | |
383 ; rcall I2C_WaitforACK | |
384 ; bsf SSPCON2,PEN ; Stop condition | |
385 ; rcall WaitMSSP | |
386 ; return | |
387 ;I2C_RX: | |
388 ; bcf PIR1,SSPIF | |
389 ; bsf SSPCON2,SEN ; Start condition | |
390 ; rcall WaitMSSP | |
391 ; movlw b'10010001' ; Bit0=0: WRITE, Bit0=1: READ | |
392 ; movwf SSPBUF ; control byte | |
393 ; rcall WaitMSSP | |
394 ; rcall I2C_WaitforACK | |
395 ; bsf SSPCON2, RCEN ; Enable recieve mode | |
396 ; rcall WaitMSSP | |
397 ; movff SSPBUF,i2c_temp2 ; Data Byte | |
398 ; bsf SSPCON2,ACKEN ; Master acknowlegde | |
399 ; rcall WaitMSSP | |
400 ; bsf SSPCON2,PEN ; Stop condition | |
401 ; rcall WaitMSSP | |
402 ; return |