Mercurial > public > mk2
annotate code_part1/OSTC_code_asm_part1/i2c_eeprom.asm @ 689:6761e1865dfd
minor
| author | heinrichsweikamp |
|---|---|
| date | Mon, 28 Jan 2013 11:28:15 +0100 |
| parents | 16f4eafc197e |
| children | c50296c3059e |
| rev | line source |
|---|---|
| 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 | |
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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 | |
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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 | |
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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 | |
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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 |