paul@13 | 1 | const int CE = A5, OE = A4, WE = A3, |
paul@13 | 2 | CS1 = 2, CS2 = 3, |
paul@13 | 3 | DQ0 = 4, DQ1 = 5, DQ2 = 6, DQ3 = 7, |
paul@13 | 4 | DQ4 = 8, DQ5 = 9, DQ6 = 10, DQ7 = 11; |
paul@2 | 5 | |
paul@2 | 6 | const int BUFSIZE = 8; |
paul@6 | 7 | char inbuffer[BUFSIZE]; |
paul@13 | 8 | int nread = 0; |
paul@6 | 9 | |
paul@7 | 10 | const char ERASE[][8] = { |
paul@7 | 11 | "W5555AA", "W2AAA55", "W555580", "W5555AA", "W2AAA55" |
paul@7 | 12 | }; |
paul@7 | 13 | const char PROGRAM[][8] = { |
paul@7 | 14 | "W5555AA", "W2AAA55", "W5555A0" |
paul@7 | 15 | }; |
paul@2 | 16 | |
paul@2 | 17 | int fromHex(char c) |
paul@2 | 18 | { |
paul@2 | 19 | if ((c >= 48) && (c <= 57)) |
paul@2 | 20 | return c - 48; |
paul@2 | 21 | if ((c >= 65) && (c <= 70)) |
paul@2 | 22 | return c - 65 + 10; |
paul@2 | 23 | if ((c >= 97) && (c <= 102)) |
paul@2 | 24 | return c - 97 + 10; |
paul@2 | 25 | return 0; |
paul@2 | 26 | } |
paul@2 | 27 | |
paul@2 | 28 | void setDataOut() |
paul@2 | 29 | { |
paul@2 | 30 | pinMode(DQ0, OUTPUT); |
paul@2 | 31 | pinMode(DQ1, OUTPUT); |
paul@2 | 32 | pinMode(DQ2, OUTPUT); |
paul@2 | 33 | pinMode(DQ3, OUTPUT); |
paul@2 | 34 | pinMode(DQ4, OUTPUT); |
paul@2 | 35 | pinMode(DQ5, OUTPUT); |
paul@2 | 36 | pinMode(DQ6, OUTPUT); |
paul@2 | 37 | pinMode(DQ7, OUTPUT); |
paul@2 | 38 | } |
paul@2 | 39 | |
paul@2 | 40 | void setDataIn() |
paul@2 | 41 | { |
paul@2 | 42 | pinMode(DQ0, INPUT); |
paul@2 | 43 | pinMode(DQ1, INPUT); |
paul@2 | 44 | pinMode(DQ2, INPUT); |
paul@2 | 45 | pinMode(DQ3, INPUT); |
paul@2 | 46 | pinMode(DQ4, INPUT); |
paul@2 | 47 | pinMode(DQ5, INPUT); |
paul@2 | 48 | pinMode(DQ6, INPUT); |
paul@2 | 49 | pinMode(DQ7, INPUT); |
paul@2 | 50 | } |
paul@2 | 51 | |
paul@6 | 52 | int sampleData() |
paul@2 | 53 | { |
paul@2 | 54 | int i = DQ7; |
paul@2 | 55 | int data = 0; |
paul@2 | 56 | |
paul@2 | 57 | while (1) |
paul@2 | 58 | { |
paul@2 | 59 | data += digitalRead(i); |
paul@2 | 60 | if (i == DQ0) |
paul@2 | 61 | break; |
paul@2 | 62 | i--; |
paul@2 | 63 | data <<= 1; |
paul@2 | 64 | } |
paul@2 | 65 | |
paul@6 | 66 | return data; |
paul@6 | 67 | } |
paul@6 | 68 | |
paul@6 | 69 | int readData() |
paul@6 | 70 | { |
paul@6 | 71 | int data = 0; |
paul@6 | 72 | |
paul@6 | 73 | setDataIn(); |
paul@7 | 74 | delay(1); |
paul@6 | 75 | data = sampleData(); |
paul@2 | 76 | setDataOut(); |
paul@2 | 77 | return data; |
paul@2 | 78 | } |
paul@2 | 79 | |
paul@2 | 80 | void writeData(int data) |
paul@2 | 81 | { |
paul@2 | 82 | int i = DQ0; |
paul@2 | 83 | |
paul@2 | 84 | while (1) |
paul@2 | 85 | { |
paul@2 | 86 | digitalWrite(i, data % 2); |
paul@2 | 87 | if (i == DQ7) |
paul@2 | 88 | break; |
paul@2 | 89 | i++; |
paul@2 | 90 | data >>= 1; |
paul@2 | 91 | } |
paul@2 | 92 | } |
paul@2 | 93 | |
paul@2 | 94 | void setAddress(int high, int low) |
paul@2 | 95 | { |
paul@2 | 96 | writeData(high); |
paul@2 | 97 | delayMicroseconds(1); |
paul@2 | 98 | digitalWrite(CS2, HIGH); |
paul@2 | 99 | delayMicroseconds(1); |
paul@2 | 100 | digitalWrite(CS2, LOW); |
paul@2 | 101 | writeData(low); |
paul@2 | 102 | delayMicroseconds(1); |
paul@2 | 103 | digitalWrite(CS1, HIGH); |
paul@2 | 104 | delayMicroseconds(1); |
paul@2 | 105 | digitalWrite(CS1, LOW); |
paul@2 | 106 | } |
paul@2 | 107 | |
paul@6 | 108 | int readOp(int high, int low) |
paul@2 | 109 | { |
paul@6 | 110 | int data; |
paul@2 | 111 | |
paul@3 | 112 | digitalWrite(CE, LOW); |
paul@2 | 113 | setAddress(high, low); |
paul@7 | 114 | delay(1); |
paul@2 | 115 | digitalWrite(OE, LOW); |
paul@2 | 116 | data = readData(); |
paul@7 | 117 | delay(1); |
paul@2 | 118 | digitalWrite(OE, HIGH); |
paul@3 | 119 | digitalWrite(CE, HIGH); |
paul@2 | 120 | |
paul@2 | 121 | return data; |
paul@2 | 122 | } |
paul@2 | 123 | |
paul@6 | 124 | void writeOp(int high, int low, int data) |
paul@6 | 125 | { |
paul@6 | 126 | digitalWrite(CE, LOW); |
paul@6 | 127 | setAddress(high, low); |
paul@7 | 128 | delay(1); |
paul@6 | 129 | digitalWrite(WE, LOW); |
paul@6 | 130 | writeData(data); |
paul@7 | 131 | delay(1); |
paul@6 | 132 | digitalWrite(WE, HIGH); |
paul@6 | 133 | digitalWrite(CE, HIGH); |
paul@6 | 134 | } |
paul@6 | 135 | |
paul@13 | 136 | int readCommand(const char buffer[]) |
paul@6 | 137 | { |
paul@6 | 138 | int high, low; |
paul@6 | 139 | |
paul@6 | 140 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@6 | 141 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@6 | 142 | |
paul@6 | 143 | return readOp(high, low); |
paul@6 | 144 | } |
paul@6 | 145 | |
paul@13 | 146 | bool writeCommand(const char buffer[]) |
paul@2 | 147 | { |
paul@2 | 148 | int high, low, data; |
paul@2 | 149 | |
paul@2 | 150 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@2 | 151 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@2 | 152 | data = (fromHex(buffer[5]) << 4) + (fromHex(buffer[6])); |
paul@2 | 153 | |
paul@6 | 154 | writeOp(high, low, data); |
paul@2 | 155 | |
paul@2 | 156 | return true; |
paul@2 | 157 | } |
paul@2 | 158 | |
paul@6 | 159 | bool waitForCompletion(int high, int low, int written) |
paul@6 | 160 | { |
paul@9 | 161 | int data, then = millis(); |
paul@6 | 162 | |
paul@12 | 163 | setDataIn(); |
paul@12 | 164 | digitalWrite(CE, LOW); |
paul@12 | 165 | digitalWrite(OE, LOW); |
paul@12 | 166 | |
paul@6 | 167 | do |
paul@6 | 168 | { |
paul@6 | 169 | delay(10); |
paul@12 | 170 | data = sampleData(); |
paul@6 | 171 | } while ( |
paul@6 | 172 | ((data & 0x80) != (written & 0x80)) && |
paul@9 | 173 | ((data & 0x20) == 0) && |
paul@9 | 174 | (millis() - then < 2000) |
paul@6 | 175 | ); |
paul@6 | 176 | |
paul@12 | 177 | digitalWrite(OE, HIGH); |
paul@12 | 178 | digitalWrite(CE, HIGH); |
paul@12 | 179 | setDataOut(); |
paul@12 | 180 | delay(10); |
paul@7 | 181 | return readOp(high, low) == written; |
paul@6 | 182 | } |
paul@6 | 183 | |
paul@6 | 184 | bool chipErase() |
paul@6 | 185 | { |
paul@7 | 186 | for (int i = 0; i < 5; i++) |
paul@7 | 187 | { |
paul@13 | 188 | writeCommand(ERASE[i]); |
paul@7 | 189 | } |
paul@7 | 190 | writeOp(0x55, 0x55, 0x30); |
paul@6 | 191 | return waitForCompletion(0, 0, 0xff); |
paul@6 | 192 | } |
paul@6 | 193 | |
paul@13 | 194 | bool sectorErase(const char buffer[]) |
paul@6 | 195 | { |
paul@6 | 196 | int high; |
paul@6 | 197 | |
paul@6 | 198 | // 3-bit number shifted to A16...A14 with A16 discarded. |
paul@6 | 199 | // Thus, only sectors from 0 to 3 are supported. |
paul@6 | 200 | |
paul@6 | 201 | high = (fromHex(buffer[1]) << 6) & 0xff; |
paul@6 | 202 | |
paul@7 | 203 | for (int i = 0; i < 5; i++) |
paul@7 | 204 | { |
paul@13 | 205 | writeCommand(ERASE[i]); |
paul@7 | 206 | } |
paul@6 | 207 | writeOp(high, 0, 0x30); |
paul@6 | 208 | |
paul@6 | 209 | // Result of erase if 0xff written to all locations. |
paul@6 | 210 | |
paul@6 | 211 | return waitForCompletion(high, 0, 0xff); |
paul@6 | 212 | } |
paul@6 | 213 | |
paul@13 | 214 | bool program(const char buffer[]) |
paul@6 | 215 | { |
paul@6 | 216 | int high, low, data; |
paul@6 | 217 | |
paul@8 | 218 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@6 | 219 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@6 | 220 | data = (fromHex(buffer[5]) << 4) + (fromHex(buffer[6])); |
paul@6 | 221 | |
paul@7 | 222 | for (int i = 0; i < 3; i++) |
paul@7 | 223 | { |
paul@13 | 224 | writeCommand(PROGRAM[i]); |
paul@7 | 225 | } |
paul@6 | 226 | writeOp(high, low, data); |
paul@6 | 227 | |
paul@6 | 228 | return waitForCompletion(high, low, data); |
paul@6 | 229 | } |
paul@6 | 230 | |
paul@2 | 231 | void setup() |
paul@2 | 232 | { |
paul@2 | 233 | Serial.begin(115200); |
paul@2 | 234 | pinMode(CE, OUTPUT); |
paul@2 | 235 | pinMode(OE, OUTPUT); |
paul@2 | 236 | pinMode(WE, OUTPUT); |
paul@2 | 237 | pinMode(CS1, OUTPUT); |
paul@2 | 238 | pinMode(CS2, OUTPUT); |
paul@2 | 239 | setDataOut(); |
paul@2 | 240 | |
paul@2 | 241 | // Initial state for the flash device. |
paul@2 | 242 | |
paul@2 | 243 | digitalWrite(CE, HIGH); |
paul@2 | 244 | digitalWrite(OE, HIGH); |
paul@2 | 245 | digitalWrite(WE, HIGH); |
paul@2 | 246 | |
paul@2 | 247 | // Initial state for the latches. |
paul@2 | 248 | |
paul@2 | 249 | digitalWrite(CS1, LOW); |
paul@2 | 250 | digitalWrite(CS2, LOW); |
paul@2 | 251 | |
paul@2 | 252 | // Interface loop. |
paul@2 | 253 | |
paul@3 | 254 | Serial.println("?"); |
paul@6 | 255 | } |
paul@2 | 256 | |
paul@6 | 257 | void loop() |
paul@6 | 258 | { |
paul@13 | 259 | if (nread += Serial.readBytesUntil('\n', inbuffer + nread, BUFSIZE - nread)) |
paul@2 | 260 | { |
paul@6 | 261 | switch (inbuffer[0]) |
paul@2 | 262 | { |
paul@2 | 263 | case 'R': |
paul@13 | 264 | if (nread >= 5) |
paul@13 | 265 | { |
paul@13 | 266 | Serial.println(readCommand(inbuffer), HEX); |
paul@13 | 267 | nread = 0; |
paul@13 | 268 | } |
paul@2 | 269 | break; |
paul@2 | 270 | |
paul@2 | 271 | case 'W': |
paul@13 | 272 | if (nread >= 7) |
paul@13 | 273 | { |
paul@13 | 274 | if (writeCommand(inbuffer)) |
paul@13 | 275 | Serial.println("W"); |
paul@13 | 276 | else |
paul@13 | 277 | Serial.println("C"); |
paul@13 | 278 | nread = 0; |
paul@13 | 279 | } |
paul@2 | 280 | break; |
paul@2 | 281 | |
paul@6 | 282 | case 'E': |
paul@6 | 283 | if (chipErase()) |
paul@6 | 284 | Serial.println("E"); |
paul@6 | 285 | else |
paul@6 | 286 | Serial.println("C"); |
paul@13 | 287 | nread = 0; |
paul@6 | 288 | break; |
paul@6 | 289 | |
paul@6 | 290 | case 'S': |
paul@13 | 291 | if (nread >= 2) |
paul@13 | 292 | { |
paul@13 | 293 | if (sectorErase(inbuffer)) |
paul@13 | 294 | Serial.println("S"); |
paul@13 | 295 | else |
paul@13 | 296 | Serial.println("C"); |
paul@13 | 297 | nread = 0; |
paul@13 | 298 | } |
paul@6 | 299 | break; |
paul@6 | 300 | |
paul@6 | 301 | case 'P': |
paul@13 | 302 | if (nread >= 7) |
paul@13 | 303 | { |
paul@13 | 304 | if (program(inbuffer)) |
paul@13 | 305 | Serial.println("P"); |
paul@13 | 306 | else |
paul@13 | 307 | Serial.println("C"); |
paul@13 | 308 | nread = 0; |
paul@13 | 309 | } |
paul@6 | 310 | break; |
paul@6 | 311 | |
paul@2 | 312 | default: |
paul@12 | 313 | Serial.println(inbuffer[0]); |
paul@13 | 314 | nread = 0; |
paul@2 | 315 | break; |
paul@2 | 316 | } |
paul@12 | 317 | |
paul@12 | 318 | Serial.flush(); |
paul@2 | 319 | } |
paul@2 | 320 | } |
paul@2 | 321 | |
paul@2 | 322 | extern "C" void __cxa_pure_virtual(void) { |
paul@2 | 323 | while(1); |
paul@2 | 324 | } |
paul@2 | 325 | |
paul@2 | 326 | // tabstop=4 expandtab shiftwidth=4 |