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@2 | 7 | char buffer[BUFSIZE]; |
paul@2 | 8 | |
paul@2 | 9 | int fromHex(char c) |
paul@2 | 10 | { |
paul@2 | 11 | if ((c >= 48) && (c <= 57)) |
paul@2 | 12 | return c - 48; |
paul@2 | 13 | if ((c >= 65) && (c <= 70)) |
paul@2 | 14 | return c - 65 + 10; |
paul@2 | 15 | if ((c >= 97) && (c <= 102)) |
paul@2 | 16 | return c - 97 + 10; |
paul@2 | 17 | return 0; |
paul@2 | 18 | } |
paul@2 | 19 | |
paul@2 | 20 | void setDataOut() |
paul@2 | 21 | { |
paul@2 | 22 | pinMode(DQ0, OUTPUT); |
paul@2 | 23 | pinMode(DQ1, OUTPUT); |
paul@2 | 24 | pinMode(DQ2, OUTPUT); |
paul@2 | 25 | pinMode(DQ3, OUTPUT); |
paul@2 | 26 | pinMode(DQ4, OUTPUT); |
paul@2 | 27 | pinMode(DQ5, OUTPUT); |
paul@2 | 28 | pinMode(DQ6, OUTPUT); |
paul@2 | 29 | pinMode(DQ7, OUTPUT); |
paul@2 | 30 | } |
paul@2 | 31 | |
paul@2 | 32 | void setDataIn() |
paul@2 | 33 | { |
paul@2 | 34 | pinMode(DQ0, INPUT); |
paul@2 | 35 | pinMode(DQ1, INPUT); |
paul@2 | 36 | pinMode(DQ2, INPUT); |
paul@2 | 37 | pinMode(DQ3, INPUT); |
paul@2 | 38 | pinMode(DQ4, INPUT); |
paul@2 | 39 | pinMode(DQ5, INPUT); |
paul@2 | 40 | pinMode(DQ6, INPUT); |
paul@2 | 41 | pinMode(DQ7, INPUT); |
paul@2 | 42 | } |
paul@2 | 43 | |
paul@2 | 44 | int readData() |
paul@2 | 45 | { |
paul@2 | 46 | int i = DQ7; |
paul@2 | 47 | int data = 0; |
paul@2 | 48 | |
paul@2 | 49 | setDataIn(); |
paul@3 | 50 | delay(10); |
paul@2 | 51 | |
paul@2 | 52 | while (1) |
paul@2 | 53 | { |
paul@2 | 54 | data += digitalRead(i); |
paul@2 | 55 | if (i == DQ0) |
paul@2 | 56 | break; |
paul@2 | 57 | i--; |
paul@2 | 58 | data <<= 1; |
paul@2 | 59 | } |
paul@2 | 60 | |
paul@2 | 61 | setDataOut(); |
paul@2 | 62 | return data; |
paul@2 | 63 | } |
paul@2 | 64 | |
paul@2 | 65 | void writeData(int data) |
paul@2 | 66 | { |
paul@2 | 67 | int i = DQ0; |
paul@2 | 68 | |
paul@2 | 69 | while (1) |
paul@2 | 70 | { |
paul@2 | 71 | digitalWrite(i, data % 2); |
paul@2 | 72 | if (i == DQ7) |
paul@2 | 73 | break; |
paul@2 | 74 | i++; |
paul@2 | 75 | data >>= 1; |
paul@2 | 76 | } |
paul@2 | 77 | } |
paul@2 | 78 | |
paul@2 | 79 | void setAddress(int high, int low) |
paul@2 | 80 | { |
paul@2 | 81 | writeData(high); |
paul@2 | 82 | delayMicroseconds(1); |
paul@2 | 83 | digitalWrite(CS2, HIGH); |
paul@2 | 84 | delayMicroseconds(1); |
paul@2 | 85 | digitalWrite(CS2, LOW); |
paul@2 | 86 | writeData(low); |
paul@2 | 87 | delayMicroseconds(1); |
paul@2 | 88 | digitalWrite(CS1, HIGH); |
paul@2 | 89 | delayMicroseconds(1); |
paul@2 | 90 | digitalWrite(CS1, LOW); |
paul@2 | 91 | } |
paul@2 | 92 | |
paul@2 | 93 | int readOutput(int nread) |
paul@2 | 94 | { |
paul@2 | 95 | int high, low, data; |
paul@2 | 96 | |
paul@2 | 97 | if (nread < 5) |
paul@2 | 98 | return 0; |
paul@2 | 99 | |
paul@2 | 100 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@2 | 101 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@2 | 102 | |
paul@3 | 103 | digitalWrite(CE, LOW); |
paul@2 | 104 | setAddress(high, low); |
paul@3 | 105 | delay(10); |
paul@2 | 106 | digitalWrite(OE, LOW); |
paul@2 | 107 | data = readData(); |
paul@3 | 108 | delay(10); |
paul@2 | 109 | digitalWrite(OE, HIGH); |
paul@3 | 110 | digitalWrite(CE, HIGH); |
paul@2 | 111 | |
paul@2 | 112 | return data; |
paul@2 | 113 | } |
paul@2 | 114 | |
paul@2 | 115 | bool writeOutput(int nread) |
paul@2 | 116 | { |
paul@2 | 117 | int high, low, data; |
paul@2 | 118 | |
paul@2 | 119 | if (nread < 7) |
paul@2 | 120 | return false; |
paul@2 | 121 | |
paul@2 | 122 | high = (fromHex(buffer[1]) << 4) + (fromHex(buffer[2])); |
paul@2 | 123 | low = (fromHex(buffer[3]) << 4) + (fromHex(buffer[4])); |
paul@2 | 124 | data = (fromHex(buffer[5]) << 4) + (fromHex(buffer[6])); |
paul@2 | 125 | |
paul@3 | 126 | digitalWrite(CE, LOW); |
paul@2 | 127 | setAddress(high, low); |
paul@3 | 128 | delay(10); |
paul@2 | 129 | digitalWrite(WE, LOW); |
paul@2 | 130 | writeData(data); |
paul@3 | 131 | delay(10); |
paul@2 | 132 | digitalWrite(WE, HIGH); |
paul@3 | 133 | digitalWrite(CE, HIGH); |
paul@2 | 134 | |
paul@2 | 135 | return true; |
paul@2 | 136 | } |
paul@2 | 137 | |
paul@2 | 138 | void setup() |
paul@2 | 139 | { |
paul@2 | 140 | int nread = 0; |
paul@2 | 141 | |
paul@2 | 142 | Serial.begin(115200); |
paul@2 | 143 | pinMode(CE, OUTPUT); |
paul@2 | 144 | pinMode(OE, OUTPUT); |
paul@2 | 145 | pinMode(WE, OUTPUT); |
paul@2 | 146 | pinMode(CS1, OUTPUT); |
paul@2 | 147 | pinMode(CS2, OUTPUT); |
paul@2 | 148 | setDataOut(); |
paul@2 | 149 | |
paul@2 | 150 | // Initial state for the flash device. |
paul@2 | 151 | |
paul@2 | 152 | digitalWrite(CE, HIGH); |
paul@2 | 153 | digitalWrite(OE, HIGH); |
paul@2 | 154 | digitalWrite(WE, HIGH); |
paul@2 | 155 | |
paul@2 | 156 | // Initial state for the latches. |
paul@2 | 157 | |
paul@2 | 158 | digitalWrite(CS1, LOW); |
paul@2 | 159 | digitalWrite(CS2, LOW); |
paul@2 | 160 | |
paul@2 | 161 | // Interface loop. |
paul@2 | 162 | |
paul@3 | 163 | Serial.println("?"); |
paul@2 | 164 | Serial.setTimeout(3600000); // 1 hour |
paul@2 | 165 | |
paul@2 | 166 | while (nread = Serial.readBytesUntil('\n', buffer, BUFSIZE)) |
paul@2 | 167 | { |
paul@2 | 168 | switch (buffer[0]) |
paul@2 | 169 | { |
paul@2 | 170 | case 'R': |
paul@2 | 171 | Serial.println(readOutput(nread), HEX); |
paul@2 | 172 | break; |
paul@2 | 173 | |
paul@2 | 174 | case 'W': |
paul@2 | 175 | if (writeOutput(nread)) |
paul@3 | 176 | Serial.println("W"); |
paul@2 | 177 | else |
paul@3 | 178 | Serial.println("C"); |
paul@2 | 179 | break; |
paul@2 | 180 | |
paul@2 | 181 | default: |
paul@3 | 182 | Serial.println("?"); |
paul@2 | 183 | break; |
paul@2 | 184 | } |
paul@2 | 185 | } |
paul@2 | 186 | |
paul@2 | 187 | Serial.println("Done."); |
paul@2 | 188 | } |
paul@2 | 189 | |
paul@2 | 190 | void loop() |
paul@2 | 191 | { |
paul@2 | 192 | } |
paul@2 | 193 | |
paul@2 | 194 | extern "C" void __cxa_pure_virtual(void) { |
paul@2 | 195 | while(1); |
paul@2 | 196 | } |
paul@2 | 197 | |
paul@2 | 198 | // tabstop=4 expandtab shiftwidth=4 |