paul@3 | 1 | const int CE = A5, OE = 2, WE = 3, |
paul@2 | 2 | CS1 = 4, CS2 = 5, |
paul@2 | 3 | DQ0 = 6, DQ1 = 7, DQ2 = 8, DQ3 = 9, |
paul@2 | 4 | DQ4 = 10, DQ5 = 11, DQ6 = 12, DQ7 = 13; |
paul@2 | 5 | |
paul@2 | 6 | const int BUFSIZE = 8; |
paul@6 | 7 | char inbuffer[BUFSIZE]; |
paul@6 | 8 | |
paul@6 | 9 | const char CHIP_ERASE[] = "W5555AA\nW2AAA55\nW555580\nW5555AA\nW2AAA55\nW555510\n"; |
paul@6 | 10 | const char SECTOR_ERASE[] = "W5555AA\nW2AAA55\nW555580\nW5555AA\nW2AAA55\n"; |
paul@6 | 11 | const char PROGRAM[] = "W5555AA\nW2AAA55\nW5555A0\n"; |
paul@2 | 12 | |
paul@2 | 13 | int fromHex(char c) |
paul@2 | 14 | { |
paul@2 | 15 | if ((c >= 48) && (c <= 57)) |
paul@2 | 16 | return c - 48; |
paul@2 | 17 | if ((c >= 65) && (c <= 70)) |
paul@2 | 18 | return c - 65 + 10; |
paul@2 | 19 | if ((c >= 97) && (c <= 102)) |
paul@2 | 20 | return c - 97 + 10; |
paul@2 | 21 | return 0; |
paul@2 | 22 | } |
paul@2 | 23 | |
paul@2 | 24 | void setDataOut() |
paul@2 | 25 | { |
paul@2 | 26 | pinMode(DQ0, OUTPUT); |
paul@2 | 27 | pinMode(DQ1, OUTPUT); |
paul@2 | 28 | pinMode(DQ2, OUTPUT); |
paul@2 | 29 | pinMode(DQ3, OUTPUT); |
paul@2 | 30 | pinMode(DQ4, OUTPUT); |
paul@2 | 31 | pinMode(DQ5, OUTPUT); |
paul@2 | 32 | pinMode(DQ6, OUTPUT); |
paul@2 | 33 | pinMode(DQ7, OUTPUT); |
paul@2 | 34 | } |
paul@2 | 35 | |
paul@2 | 36 | void setDataIn() |
paul@2 | 37 | { |
paul@2 | 38 | pinMode(DQ0, INPUT); |
paul@2 | 39 | pinMode(DQ1, INPUT); |
paul@2 | 40 | pinMode(DQ2, INPUT); |
paul@2 | 41 | pinMode(DQ3, INPUT); |
paul@2 | 42 | pinMode(DQ4, INPUT); |
paul@2 | 43 | pinMode(DQ5, INPUT); |
paul@2 | 44 | pinMode(DQ6, INPUT); |
paul@2 | 45 | pinMode(DQ7, INPUT); |
paul@2 | 46 | } |
paul@2 | 47 | |
paul@6 | 48 | int sampleData() |
paul@2 | 49 | { |
paul@2 | 50 | int i = DQ7; |
paul@2 | 51 | int data = 0; |
paul@2 | 52 | |
paul@2 | 53 | while (1) |
paul@2 | 54 | { |
paul@2 | 55 | data += digitalRead(i); |
paul@2 | 56 | if (i == DQ0) |
paul@2 | 57 | break; |
paul@2 | 58 | i--; |
paul@2 | 59 | data <<= 1; |
paul@2 | 60 | } |
paul@2 | 61 | |
paul@6 | 62 | return data; |
paul@6 | 63 | } |
paul@6 | 64 | |
paul@6 | 65 | int readData() |
paul@6 | 66 | { |
paul@6 | 67 | int data = 0; |
paul@6 | 68 | |
paul@6 | 69 | setDataIn(); |
paul@6 | 70 | delay(10); |
paul@6 | 71 | data = sampleData(); |
paul@2 | 72 | setDataOut(); |
paul@2 | 73 | return data; |
paul@2 | 74 | } |
paul@2 | 75 | |
paul@2 | 76 | void writeData(int data) |
paul@2 | 77 | { |
paul@2 | 78 | int i = DQ0; |
paul@2 | 79 | |
paul@2 | 80 | while (1) |
paul@2 | 81 | { |
paul@2 | 82 | digitalWrite(i, data % 2); |
paul@2 | 83 | if (i == DQ7) |
paul@2 | 84 | break; |
paul@2 | 85 | i++; |
paul@2 | 86 | data >>= 1; |
paul@2 | 87 | } |
paul@2 | 88 | } |
paul@2 | 89 | |
paul@2 | 90 | void setAddress(int high, int low) |
paul@2 | 91 | { |
paul@2 | 92 | writeData(high); |
paul@2 | 93 | delayMicroseconds(1); |
paul@2 | 94 | digitalWrite(CS2, HIGH); |
paul@2 | 95 | delayMicroseconds(1); |
paul@2 | 96 | digitalWrite(CS2, LOW); |
paul@2 | 97 | writeData(low); |
paul@2 | 98 | delayMicroseconds(1); |
paul@2 | 99 | digitalWrite(CS1, HIGH); |
paul@2 | 100 | delayMicroseconds(1); |
paul@2 | 101 | digitalWrite(CS1, LOW); |
paul@2 | 102 | } |
paul@2 | 103 | |
paul@6 | 104 | int readOp(int high, int low) |
paul@2 | 105 | { |
paul@6 | 106 | int data; |
paul@2 | 107 | |
paul@3 | 108 | digitalWrite(CE, LOW); |
paul@2 | 109 | setAddress(high, low); |
paul@3 | 110 | delay(10); |
paul@2 | 111 | digitalWrite(OE, LOW); |
paul@2 | 112 | data = readData(); |
paul@3 | 113 | delay(10); |
paul@2 | 114 | digitalWrite(OE, HIGH); |
paul@3 | 115 | digitalWrite(CE, HIGH); |
paul@2 | 116 | |
paul@2 | 117 | return data; |
paul@2 | 118 | } |
paul@2 | 119 | |
paul@6 | 120 | void writeOp(int high, int low, int data) |
paul@6 | 121 | { |
paul@6 | 122 | digitalWrite(CE, LOW); |
paul@6 | 123 | setAddress(high, low); |
paul@6 | 124 | delay(10); |
paul@6 | 125 | digitalWrite(WE, LOW); |
paul@6 | 126 | writeData(data); |
paul@6 | 127 | delay(10); |
paul@6 | 128 | digitalWrite(WE, HIGH); |
paul@6 | 129 | digitalWrite(CE, HIGH); |
paul@6 | 130 | } |
paul@6 | 131 | |
paul@6 | 132 | int readCommand(int nread, const char buffer[]) |
paul@6 | 133 | { |
paul@6 | 134 | int high, low; |
paul@6 | 135 | |
paul@6 | 136 | if (nread < 5) |
paul@6 | 137 | return 0; |
paul@6 | 138 | |
paul@6 | 139 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@6 | 140 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@6 | 141 | |
paul@6 | 142 | return readOp(high, low); |
paul@6 | 143 | } |
paul@6 | 144 | |
paul@6 | 145 | bool writeCommand(int nread, const char buffer[]) |
paul@2 | 146 | { |
paul@2 | 147 | int high, low, data; |
paul@2 | 148 | |
paul@2 | 149 | if (nread < 7) |
paul@2 | 150 | return false; |
paul@2 | 151 | |
paul@2 | 152 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@2 | 153 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@2 | 154 | data = (fromHex(buffer[5]) << 4) + (fromHex(buffer[6])); |
paul@2 | 155 | |
paul@6 | 156 | writeOp(high, low, data); |
paul@2 | 157 | |
paul@2 | 158 | return true; |
paul@2 | 159 | } |
paul@2 | 160 | |
paul@6 | 161 | bool waitForCompletion(int high, int low, int written) |
paul@6 | 162 | { |
paul@6 | 163 | int data; |
paul@6 | 164 | |
paul@6 | 165 | setDataIn(); |
paul@6 | 166 | digitalWrite(CE, LOW); |
paul@6 | 167 | |
paul@6 | 168 | do |
paul@6 | 169 | { |
paul@6 | 170 | delay(10); |
paul@6 | 171 | digitalWrite(OE, LOW); |
paul@6 | 172 | delay(10); |
paul@6 | 173 | data = sampleData(); |
paul@6 | 174 | delay(10); |
paul@6 | 175 | digitalWrite(OE, HIGH); |
paul@6 | 176 | Serial.println(data, BIN); |
paul@6 | 177 | } while ( |
paul@6 | 178 | ((data & 0x80) != (written & 0x80)) && |
paul@6 | 179 | ((data & 0x20) == 0) |
paul@6 | 180 | ); |
paul@6 | 181 | |
paul@6 | 182 | digitalWrite(CE, HIGH); |
paul@6 | 183 | setDataOut(); |
paul@6 | 184 | |
paul@6 | 185 | return ((data & 0x20) == 0); |
paul@6 | 186 | } |
paul@6 | 187 | |
paul@6 | 188 | bool chipErase() |
paul@6 | 189 | { |
paul@6 | 190 | writeCommand(sizeof(CHIP_ERASE), CHIP_ERASE); |
paul@6 | 191 | return waitForCompletion(0, 0, 0xff); |
paul@6 | 192 | } |
paul@6 | 193 | |
paul@6 | 194 | bool sectorErase(int nread, const char buffer[]) |
paul@6 | 195 | { |
paul@6 | 196 | int high; |
paul@6 | 197 | |
paul@6 | 198 | if (nread < 2) |
paul@6 | 199 | return false; |
paul@6 | 200 | |
paul@6 | 201 | // 3-bit number shifted to A16...A14 with A16 discarded. |
paul@6 | 202 | // Thus, only sectors from 0 to 3 are supported. |
paul@6 | 203 | |
paul@6 | 204 | high = (fromHex(buffer[1]) << 6) & 0xff; |
paul@6 | 205 | |
paul@6 | 206 | writeCommand(sizeof(SECTOR_ERASE), SECTOR_ERASE); |
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@6 | 214 | bool program(int nread, const char buffer[]) |
paul@6 | 215 | { |
paul@6 | 216 | int high, low, data; |
paul@6 | 217 | |
paul@6 | 218 | if (nread < 7) |
paul@6 | 219 | return false; |
paul@6 | 220 | |
paul@6 | 221 | // 3-bit number shifted to A16...A14 with A16 discarded. |
paul@6 | 222 | // Thus, only sectors from 0 to 3 are supported. |
paul@6 | 223 | |
paul@6 | 224 | high = (fromHex(buffer[1]) << 6) & 0xff; |
paul@6 | 225 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@6 | 226 | data = (fromHex(buffer[5]) << 4) + (fromHex(buffer[6])); |
paul@6 | 227 | |
paul@6 | 228 | writeCommand(sizeof(PROGRAM), PROGRAM); |
paul@6 | 229 | writeOp(high, low, data); |
paul@6 | 230 | |
paul@6 | 231 | return waitForCompletion(high, low, data); |
paul@6 | 232 | } |
paul@6 | 233 | |
paul@2 | 234 | void setup() |
paul@2 | 235 | { |
paul@2 | 236 | Serial.begin(115200); |
paul@2 | 237 | pinMode(CE, OUTPUT); |
paul@2 | 238 | pinMode(OE, OUTPUT); |
paul@2 | 239 | pinMode(WE, OUTPUT); |
paul@2 | 240 | pinMode(CS1, OUTPUT); |
paul@2 | 241 | pinMode(CS2, OUTPUT); |
paul@2 | 242 | setDataOut(); |
paul@2 | 243 | |
paul@2 | 244 | // Initial state for the flash device. |
paul@2 | 245 | |
paul@2 | 246 | digitalWrite(CE, HIGH); |
paul@2 | 247 | digitalWrite(OE, HIGH); |
paul@2 | 248 | digitalWrite(WE, HIGH); |
paul@2 | 249 | |
paul@2 | 250 | // Initial state for the latches. |
paul@2 | 251 | |
paul@2 | 252 | digitalWrite(CS1, LOW); |
paul@2 | 253 | digitalWrite(CS2, LOW); |
paul@2 | 254 | |
paul@2 | 255 | // Interface loop. |
paul@2 | 256 | |
paul@3 | 257 | Serial.println("?"); |
paul@2 | 258 | Serial.setTimeout(3600000); // 1 hour |
paul@6 | 259 | } |
paul@2 | 260 | |
paul@6 | 261 | void loop() |
paul@6 | 262 | { |
paul@6 | 263 | int nread = 0; |
paul@6 | 264 | |
paul@6 | 265 | if (nread = Serial.readBytesUntil('\n', inbuffer, BUFSIZE)) |
paul@2 | 266 | { |
paul@6 | 267 | switch (inbuffer[0]) |
paul@2 | 268 | { |
paul@2 | 269 | case 'R': |
paul@6 | 270 | Serial.println(readCommand(nread, inbuffer), HEX); |
paul@2 | 271 | break; |
paul@2 | 272 | |
paul@2 | 273 | case 'W': |
paul@6 | 274 | if (writeCommand(nread, inbuffer)) |
paul@3 | 275 | Serial.println("W"); |
paul@2 | 276 | else |
paul@3 | 277 | Serial.println("C"); |
paul@2 | 278 | break; |
paul@2 | 279 | |
paul@6 | 280 | case 'E': |
paul@6 | 281 | if (chipErase()) |
paul@6 | 282 | Serial.println("E"); |
paul@6 | 283 | else |
paul@6 | 284 | Serial.println("C"); |
paul@6 | 285 | break; |
paul@6 | 286 | |
paul@6 | 287 | case 'S': |
paul@6 | 288 | if (sectorErase(nread, inbuffer)) |
paul@6 | 289 | Serial.println("S"); |
paul@6 | 290 | else |
paul@6 | 291 | Serial.println("C"); |
paul@6 | 292 | break; |
paul@6 | 293 | |
paul@6 | 294 | case 'P': |
paul@6 | 295 | if (program(nread, inbuffer)) |
paul@6 | 296 | Serial.println("P"); |
paul@6 | 297 | else |
paul@6 | 298 | Serial.println("C"); |
paul@6 | 299 | break; |
paul@6 | 300 | |
paul@2 | 301 | default: |
paul@3 | 302 | Serial.println("?"); |
paul@2 | 303 | break; |
paul@2 | 304 | } |
paul@2 | 305 | } |
paul@2 | 306 | } |
paul@2 | 307 | |
paul@2 | 308 | extern "C" void __cxa_pure_virtual(void) { |
paul@2 | 309 | while(1); |
paul@2 | 310 | } |
paul@2 | 311 | |
paul@2 | 312 | // tabstop=4 expandtab shiftwidth=4 |