paul@19 | 1 | /* |
paul@19 | 2 | Interfacing the Arduino Duemilanove to Am29F010 devices. |
paul@19 | 3 | |
paul@19 | 4 | Copyright (C) 2015 Paul Boddie <paul@boddie.org.uk> |
paul@19 | 5 | |
paul@19 | 6 | This program is free software; you can redistribute it and/or modify it under |
paul@19 | 7 | the terms of the GNU General Public License as published by the Free Software |
paul@19 | 8 | Foundation; either version 3 of the License, or (at your option) any later |
paul@19 | 9 | version. |
paul@19 | 10 | |
paul@19 | 11 | This program is distributed in the hope that it will be useful, but WITHOUT ANY |
paul@19 | 12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
paul@19 | 13 | PARTICULAR PURPOSE. See the GNU General Public License for more details. |
paul@19 | 14 | |
paul@19 | 15 | You should have received a copy of the GNU General Public License along |
paul@19 | 16 | with this program. If not, see <http://www.gnu.org/licenses/>. |
paul@19 | 17 | */ |
paul@19 | 18 | |
paul@28 | 19 | const int CE = A5, OE = A4, WE = A3, A16 = A2, |
paul@13 | 20 | CS1 = 2, CS2 = 3, |
paul@27 | 21 | DQ0 = 7, DQ1 = 6, DQ2 = 5, DQ3 = 4, |
paul@13 | 22 | DQ4 = 8, DQ5 = 9, DQ6 = 10, DQ7 = 11; |
paul@2 | 23 | |
paul@31 | 24 | const int datapins[8] = {DQ7, DQ6, DQ5, DQ4, DQ3, DQ2, DQ1, DQ0}; |
paul@30 | 25 | const int BUFSIZE = 9; |
paul@6 | 26 | char inbuffer[BUFSIZE]; |
paul@13 | 27 | int nread = 0; |
paul@6 | 28 | |
paul@7 | 29 | const char ERASE[][8] = { |
paul@7 | 30 | "W5555AA", "W2AAA55", "W555580", "W5555AA", "W2AAA55" |
paul@7 | 31 | }; |
paul@7 | 32 | const char PROGRAM[][8] = { |
paul@7 | 33 | "W5555AA", "W2AAA55", "W5555A0" |
paul@7 | 34 | }; |
paul@2 | 35 | |
paul@2 | 36 | int fromHex(char c) |
paul@2 | 37 | { |
paul@2 | 38 | if ((c >= 48) && (c <= 57)) |
paul@2 | 39 | return c - 48; |
paul@2 | 40 | if ((c >= 65) && (c <= 70)) |
paul@2 | 41 | return c - 65 + 10; |
paul@2 | 42 | if ((c >= 97) && (c <= 102)) |
paul@2 | 43 | return c - 97 + 10; |
paul@2 | 44 | return 0; |
paul@2 | 45 | } |
paul@2 | 46 | |
paul@2 | 47 | void setDataOut() |
paul@2 | 48 | { |
paul@2 | 49 | pinMode(DQ0, OUTPUT); |
paul@2 | 50 | pinMode(DQ1, OUTPUT); |
paul@2 | 51 | pinMode(DQ2, OUTPUT); |
paul@2 | 52 | pinMode(DQ3, OUTPUT); |
paul@2 | 53 | pinMode(DQ4, OUTPUT); |
paul@2 | 54 | pinMode(DQ5, OUTPUT); |
paul@2 | 55 | pinMode(DQ6, OUTPUT); |
paul@2 | 56 | pinMode(DQ7, OUTPUT); |
paul@2 | 57 | } |
paul@2 | 58 | |
paul@2 | 59 | void setDataIn() |
paul@2 | 60 | { |
paul@2 | 61 | pinMode(DQ0, INPUT); |
paul@2 | 62 | pinMode(DQ1, INPUT); |
paul@2 | 63 | pinMode(DQ2, INPUT); |
paul@2 | 64 | pinMode(DQ3, INPUT); |
paul@2 | 65 | pinMode(DQ4, INPUT); |
paul@2 | 66 | pinMode(DQ5, INPUT); |
paul@2 | 67 | pinMode(DQ6, INPUT); |
paul@2 | 68 | pinMode(DQ7, INPUT); |
paul@2 | 69 | } |
paul@2 | 70 | |
paul@6 | 71 | int sampleData() |
paul@2 | 72 | { |
paul@31 | 73 | int i = 0; /* start at DQ7 */ |
paul@2 | 74 | int data = 0; |
paul@2 | 75 | |
paul@31 | 76 | while (i < 8) |
paul@2 | 77 | { |
paul@2 | 78 | data <<= 1; |
paul@31 | 79 | data += digitalRead(datapins[i]); |
paul@31 | 80 | i++; |
paul@2 | 81 | } |
paul@2 | 82 | |
paul@6 | 83 | return data; |
paul@6 | 84 | } |
paul@6 | 85 | |
paul@6 | 86 | int readData() |
paul@6 | 87 | { |
paul@6 | 88 | int data = 0; |
paul@6 | 89 | |
paul@6 | 90 | setDataIn(); |
paul@7 | 91 | delay(1); |
paul@6 | 92 | data = sampleData(); |
paul@2 | 93 | setDataOut(); |
paul@2 | 94 | return data; |
paul@2 | 95 | } |
paul@2 | 96 | |
paul@2 | 97 | void writeData(int data) |
paul@2 | 98 | { |
paul@31 | 99 | int i = 8; /* start at DQ0 */ |
paul@2 | 100 | |
paul@31 | 101 | while (i > 0) |
paul@2 | 102 | { |
paul@31 | 103 | i--; |
paul@31 | 104 | digitalWrite(datapins[i], data % 2); |
paul@2 | 105 | data >>= 1; |
paul@2 | 106 | } |
paul@2 | 107 | } |
paul@2 | 108 | |
paul@2 | 109 | void setAddress(int high, int low) |
paul@2 | 110 | { |
paul@28 | 111 | /* The top bit is sent directly. */ |
paul@28 | 112 | |
paul@28 | 113 | if (high & 0x100) |
paul@28 | 114 | digitalWrite(A16, HIGH); |
paul@28 | 115 | else |
paul@28 | 116 | digitalWrite(A16, LOW); |
paul@28 | 117 | |
paul@28 | 118 | /* The lower 16 bits are sent via the latches. */ |
paul@28 | 119 | |
paul@2 | 120 | writeData(high); |
paul@2 | 121 | delayMicroseconds(1); |
paul@2 | 122 | digitalWrite(CS2, HIGH); |
paul@2 | 123 | delayMicroseconds(1); |
paul@2 | 124 | digitalWrite(CS2, LOW); |
paul@2 | 125 | writeData(low); |
paul@2 | 126 | delayMicroseconds(1); |
paul@2 | 127 | digitalWrite(CS1, HIGH); |
paul@2 | 128 | delayMicroseconds(1); |
paul@2 | 129 | digitalWrite(CS1, LOW); |
paul@2 | 130 | } |
paul@2 | 131 | |
paul@6 | 132 | int readOp(int high, int low) |
paul@2 | 133 | { |
paul@6 | 134 | int data; |
paul@2 | 135 | |
paul@3 | 136 | digitalWrite(CE, LOW); |
paul@2 | 137 | setAddress(high, low); |
paul@7 | 138 | delay(1); |
paul@2 | 139 | digitalWrite(OE, LOW); |
paul@2 | 140 | data = readData(); |
paul@7 | 141 | delay(1); |
paul@2 | 142 | digitalWrite(OE, HIGH); |
paul@3 | 143 | digitalWrite(CE, HIGH); |
paul@2 | 144 | |
paul@2 | 145 | return data; |
paul@2 | 146 | } |
paul@2 | 147 | |
paul@6 | 148 | void writeOp(int high, int low, int data) |
paul@6 | 149 | { |
paul@6 | 150 | digitalWrite(CE, LOW); |
paul@6 | 151 | setAddress(high, low); |
paul@7 | 152 | delay(1); |
paul@6 | 153 | digitalWrite(WE, LOW); |
paul@6 | 154 | writeData(data); |
paul@7 | 155 | delay(1); |
paul@6 | 156 | digitalWrite(WE, HIGH); |
paul@6 | 157 | digitalWrite(CE, HIGH); |
paul@6 | 158 | } |
paul@6 | 159 | |
paul@30 | 160 | int readCommand(const char buffer[], int nread) |
paul@6 | 161 | { |
paul@28 | 162 | int high, low, i; |
paul@6 | 163 | |
paul@28 | 164 | if (nread > 5) |
paul@28 | 165 | { |
paul@28 | 166 | high = fromHex(buffer[1]) << 8; |
paul@28 | 167 | i = 2; |
paul@28 | 168 | } |
paul@28 | 169 | else |
paul@29 | 170 | { |
paul@29 | 171 | high = 0; |
paul@28 | 172 | i = 1; |
paul@29 | 173 | } |
paul@28 | 174 | |
paul@28 | 175 | high |= (fromHex(buffer[i]) << 4) + (fromHex(buffer[i+1])); |
paul@28 | 176 | low = (fromHex(buffer[i+2]) << 4) + (fromHex(buffer[i+3])); |
paul@6 | 177 | |
paul@6 | 178 | return readOp(high, low); |
paul@6 | 179 | } |
paul@6 | 180 | |
paul@30 | 181 | bool writeCommand(const char buffer[], int nread) |
paul@2 | 182 | { |
paul@28 | 183 | int high, low, data, i; |
paul@2 | 184 | |
paul@28 | 185 | if (nread > 7) |
paul@28 | 186 | { |
paul@28 | 187 | high = fromHex(buffer[1]) << 8; |
paul@28 | 188 | i = 2; |
paul@28 | 189 | } |
paul@28 | 190 | else |
paul@29 | 191 | { |
paul@29 | 192 | high = 0; |
paul@28 | 193 | i = 1; |
paul@29 | 194 | } |
paul@28 | 195 | |
paul@28 | 196 | high |= (fromHex(buffer[i]) << 4) + (fromHex(buffer[i+1])); |
paul@28 | 197 | low = (fromHex(buffer[i+2]) << 4) + (fromHex(buffer[i+3])); |
paul@28 | 198 | data = (fromHex(buffer[i+4]) << 4) + (fromHex(buffer[i+5])); |
paul@2 | 199 | |
paul@6 | 200 | writeOp(high, low, data); |
paul@2 | 201 | |
paul@2 | 202 | return true; |
paul@2 | 203 | } |
paul@2 | 204 | |
paul@6 | 205 | bool waitForCompletion(int high, int low, int written) |
paul@6 | 206 | { |
paul@9 | 207 | int data, then = millis(); |
paul@6 | 208 | |
paul@12 | 209 | setDataIn(); |
paul@12 | 210 | digitalWrite(CE, LOW); |
paul@12 | 211 | digitalWrite(OE, LOW); |
paul@12 | 212 | |
paul@6 | 213 | do |
paul@6 | 214 | { |
paul@6 | 215 | delay(10); |
paul@12 | 216 | data = sampleData(); |
paul@6 | 217 | } while ( |
paul@6 | 218 | ((data & 0x80) != (written & 0x80)) && |
paul@9 | 219 | ((data & 0x20) == 0) && |
paul@9 | 220 | (millis() - then < 2000) |
paul@6 | 221 | ); |
paul@6 | 222 | |
paul@12 | 223 | digitalWrite(OE, HIGH); |
paul@12 | 224 | digitalWrite(CE, HIGH); |
paul@12 | 225 | setDataOut(); |
paul@12 | 226 | delay(10); |
paul@7 | 227 | return readOp(high, low) == written; |
paul@6 | 228 | } |
paul@6 | 229 | |
paul@6 | 230 | bool chipErase() |
paul@6 | 231 | { |
paul@7 | 232 | for (int i = 0; i < 5; i++) |
paul@7 | 233 | { |
paul@30 | 234 | writeCommand(ERASE[i], 7); |
paul@7 | 235 | } |
paul@7 | 236 | writeOp(0x55, 0x55, 0x30); |
paul@6 | 237 | return waitForCompletion(0, 0, 0xff); |
paul@6 | 238 | } |
paul@6 | 239 | |
paul@13 | 240 | bool sectorErase(const char buffer[]) |
paul@6 | 241 | { |
paul@6 | 242 | int high; |
paul@6 | 243 | |
paul@29 | 244 | // 3-bit number shifted to A16...A14. |
paul@29 | 245 | // Thus, only sectors from 0 to 7 are supported. |
paul@6 | 246 | |
paul@29 | 247 | high = (fromHex(buffer[1]) << 6) & 0x1ff; |
paul@6 | 248 | |
paul@7 | 249 | for (int i = 0; i < 5; i++) |
paul@7 | 250 | { |
paul@30 | 251 | writeCommand(ERASE[i], 7); |
paul@7 | 252 | } |
paul@6 | 253 | writeOp(high, 0, 0x30); |
paul@6 | 254 | |
paul@6 | 255 | // Result of erase if 0xff written to all locations. |
paul@6 | 256 | |
paul@6 | 257 | return waitForCompletion(high, 0, 0xff); |
paul@6 | 258 | } |
paul@6 | 259 | |
paul@30 | 260 | bool program(const char buffer[], int nread) |
paul@6 | 261 | { |
paul@29 | 262 | int high, low, data, i; |
paul@6 | 263 | |
paul@29 | 264 | if (nread > 7) |
paul@29 | 265 | { |
paul@29 | 266 | high = fromHex(buffer[1]) << 8; |
paul@29 | 267 | i = 2; |
paul@29 | 268 | } |
paul@29 | 269 | else |
paul@29 | 270 | { |
paul@29 | 271 | high = 0; |
paul@29 | 272 | i = 1; |
paul@29 | 273 | } |
paul@29 | 274 | |
paul@29 | 275 | high |= (fromHex(buffer[i]) << 4) + (fromHex(buffer[i+1])); |
paul@29 | 276 | low = (fromHex(buffer[i+2]) << 4) + (fromHex(buffer[i+3])); |
paul@29 | 277 | data = (fromHex(buffer[i+4]) << 4) + (fromHex(buffer[i+5])); |
paul@6 | 278 | |
paul@7 | 279 | for (int i = 0; i < 3; i++) |
paul@7 | 280 | { |
paul@30 | 281 | writeCommand(PROGRAM[i], 7); |
paul@7 | 282 | } |
paul@6 | 283 | writeOp(high, low, data); |
paul@6 | 284 | |
paul@6 | 285 | return waitForCompletion(high, low, data); |
paul@6 | 286 | } |
paul@6 | 287 | |
paul@2 | 288 | void setup() |
paul@2 | 289 | { |
paul@2 | 290 | Serial.begin(115200); |
paul@2 | 291 | pinMode(CE, OUTPUT); |
paul@2 | 292 | pinMode(OE, OUTPUT); |
paul@2 | 293 | pinMode(WE, OUTPUT); |
paul@28 | 294 | pinMode(A16, OUTPUT); |
paul@2 | 295 | pinMode(CS1, OUTPUT); |
paul@2 | 296 | pinMode(CS2, OUTPUT); |
paul@2 | 297 | setDataOut(); |
paul@2 | 298 | |
paul@2 | 299 | // Initial state for the flash device. |
paul@2 | 300 | |
paul@2 | 301 | digitalWrite(CE, HIGH); |
paul@2 | 302 | digitalWrite(OE, HIGH); |
paul@2 | 303 | digitalWrite(WE, HIGH); |
paul@28 | 304 | digitalWrite(A16, LOW); |
paul@2 | 305 | |
paul@2 | 306 | // Initial state for the latches. |
paul@2 | 307 | |
paul@2 | 308 | digitalWrite(CS1, LOW); |
paul@2 | 309 | digitalWrite(CS2, LOW); |
paul@2 | 310 | |
paul@2 | 311 | // Interface loop. |
paul@2 | 312 | |
paul@3 | 313 | Serial.println("?"); |
paul@6 | 314 | } |
paul@2 | 315 | |
paul@6 | 316 | void loop() |
paul@6 | 317 | { |
paul@13 | 318 | if (nread += Serial.readBytesUntil('\n', inbuffer + nread, BUFSIZE - nread)) |
paul@2 | 319 | { |
paul@6 | 320 | switch (inbuffer[0]) |
paul@2 | 321 | { |
paul@2 | 322 | case 'R': |
paul@13 | 323 | if (nread >= 5) |
paul@13 | 324 | { |
paul@30 | 325 | Serial.println(readCommand(inbuffer, nread), HEX); |
paul@13 | 326 | nread = 0; |
paul@13 | 327 | } |
paul@2 | 328 | break; |
paul@2 | 329 | |
paul@2 | 330 | case 'W': |
paul@13 | 331 | if (nread >= 7) |
paul@13 | 332 | { |
paul@30 | 333 | if (writeCommand(inbuffer, nread)) |
paul@13 | 334 | Serial.println("W"); |
paul@13 | 335 | else |
paul@13 | 336 | Serial.println("C"); |
paul@13 | 337 | nread = 0; |
paul@13 | 338 | } |
paul@2 | 339 | break; |
paul@2 | 340 | |
paul@6 | 341 | case 'E': |
paul@6 | 342 | if (chipErase()) |
paul@6 | 343 | Serial.println("E"); |
paul@6 | 344 | else |
paul@6 | 345 | Serial.println("C"); |
paul@13 | 346 | nread = 0; |
paul@6 | 347 | break; |
paul@6 | 348 | |
paul@6 | 349 | case 'S': |
paul@13 | 350 | if (nread >= 2) |
paul@13 | 351 | { |
paul@13 | 352 | if (sectorErase(inbuffer)) |
paul@13 | 353 | Serial.println("S"); |
paul@13 | 354 | else |
paul@13 | 355 | Serial.println("C"); |
paul@13 | 356 | nread = 0; |
paul@13 | 357 | } |
paul@6 | 358 | break; |
paul@6 | 359 | |
paul@6 | 360 | case 'P': |
paul@13 | 361 | if (nread >= 7) |
paul@13 | 362 | { |
paul@30 | 363 | if (program(inbuffer, nread)) |
paul@13 | 364 | Serial.println("P"); |
paul@13 | 365 | else |
paul@13 | 366 | Serial.println("C"); |
paul@13 | 367 | nread = 0; |
paul@13 | 368 | } |
paul@6 | 369 | break; |
paul@6 | 370 | |
paul@2 | 371 | default: |
paul@12 | 372 | Serial.println(inbuffer[0]); |
paul@13 | 373 | nread = 0; |
paul@2 | 374 | break; |
paul@2 | 375 | } |
paul@12 | 376 | |
paul@12 | 377 | Serial.flush(); |
paul@2 | 378 | } |
paul@2 | 379 | } |
paul@2 | 380 | |
paul@2 | 381 | extern "C" void __cxa_pure_virtual(void) { |
paul@2 | 382 | while(1); |
paul@2 | 383 | } |
paul@2 | 384 | |
paul@2 | 385 | // tabstop=4 expandtab shiftwidth=4 |