Thomas Hamilton
SD Card Interface class. Log raw data bytes to memory addresses of your choice, or format the card and use the FAT file system to write files.
main.cpp@0:f3870f76a890, 2010-07-18 (annotated)
- Committer:
- Blaze513
- Date:
- Sun Jul 18 21:26:24 2010 +0000
- Revision:
- 0:f3870f76a890
- Child:
- 1:94c648931f84
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| Blaze513 | 0:f3870f76a890 | 1 | #include "mbed.h" |
| Blaze513 | 0:f3870f76a890 | 2 | #include "stdint.h" |
| Blaze513 | 0:f3870f76a890 | 3 | |
| Blaze513 | 0:f3870f76a890 | 4 | SPI Card(p5, p6, p7); |
| Blaze513 | 0:f3870f76a890 | 5 | //mosi, miso, sck |
| Blaze513 | 0:f3870f76a890 | 6 | DigitalOut cs(p8); |
| Blaze513 | 0:f3870f76a890 | 7 | //chip select |
| Blaze513 | 0:f3870f76a890 | 8 | |
| Blaze513 | 0:f3870f76a890 | 9 | unsigned char OCR[4]; |
| Blaze513 | 0:f3870f76a890 | 10 | //operating condition register |
| Blaze513 | 0:f3870f76a890 | 11 | unsigned char CSD[16]; |
| Blaze513 | 0:f3870f76a890 | 12 | //card-specific data register |
| Blaze513 | 0:f3870f76a890 | 13 | bool Version; |
| Blaze513 | 0:f3870f76a890 | 14 | //card version, low for 1, high for 2 |
| Blaze513 | 0:f3870f76a890 | 15 | bool Capacity; |
| Blaze513 | 0:f3870f76a890 | 16 | //low for low-capacity, high for high-capacity |
| Blaze513 | 0:f3870f76a890 | 17 | bool CRCMode; |
| Blaze513 | 0:f3870f76a890 | 18 | //low to disable CRCs, high to enable CRCs |
| Blaze513 | 0:f3870f76a890 | 19 | unsigned char CommandCRCTable[256]; |
| Blaze513 | 0:f3870f76a890 | 20 | //CRC7 lookup table |
| Blaze513 | 0:f3870f76a890 | 21 | unsigned char DataCRCTable[512]; |
| Blaze513 | 0:f3870f76a890 | 22 | //CRC CCITT lookup table |
| Blaze513 | 0:f3870f76a890 | 23 | unsigned char Workspace[5]; |
| Blaze513 | 0:f3870f76a890 | 24 | //generic information holder |
| Blaze513 | 0:f3870f76a890 | 25 | |
| Blaze513 | 0:f3870f76a890 | 26 | ////////////////////////////// |
| Blaze513 | 0:f3870f76a890 | 27 | DigitalOut led1(LED1); |
| Blaze513 | 0:f3870f76a890 | 28 | DigitalOut led2(LED2); |
| Blaze513 | 0:f3870f76a890 | 29 | DigitalOut led3(LED3); |
| Blaze513 | 0:f3870f76a890 | 30 | DigitalOut led4(LED4); |
| Blaze513 | 0:f3870f76a890 | 31 | Serial Computer(USBTX, USBRX); |
| Blaze513 | 0:f3870f76a890 | 32 | //for testing |
| Blaze513 | 0:f3870f76a890 | 33 | ////////////////////////////// |
| Blaze513 | 0:f3870f76a890 | 34 | |
| Blaze513 | 0:f3870f76a890 | 35 | bool Initialize(); |
| Blaze513 | 0:f3870f76a890 | 36 | bool Write(unsigned int Address, unsigned char* Data); |
| Blaze513 | 0:f3870f76a890 | 37 | bool Read(unsigned int Address, unsigned char* Data); |
| Blaze513 | 0:f3870f76a890 | 38 | void Command(unsigned char Index, unsigned int Argument, unsigned char* Response); |
| Blaze513 | 0:f3870f76a890 | 39 | char CommandCRC(unsigned char* IndexPtr, unsigned int* ArgumentPtr); |
| Blaze513 | 0:f3870f76a890 | 40 | void DataCRC(unsigned short Length, unsigned char* Data, unsigned char* Result); |
| Blaze513 | 0:f3870f76a890 | 41 | void GenerateCRCTable(unsigned char Size, unsigned long long Generator, unsigned char* Table); |
| Blaze513 | 0:f3870f76a890 | 42 | |
| Blaze513 | 0:f3870f76a890 | 43 | int main() |
| Blaze513 | 0:f3870f76a890 | 44 | { |
| Blaze513 | 0:f3870f76a890 | 45 | ///////////////////// |
| Blaze513 | 0:f3870f76a890 | 46 | led1 = 0; |
| Blaze513 | 0:f3870f76a890 | 47 | led2 = 0; |
| Blaze513 | 0:f3870f76a890 | 48 | led3 = 0; |
| Blaze513 | 0:f3870f76a890 | 49 | led4 = 0; |
| Blaze513 | 0:f3870f76a890 | 50 | Computer.baud(9600); |
| Blaze513 | 0:f3870f76a890 | 51 | //for testing |
| Blaze513 | 0:f3870f76a890 | 52 | unsigned char wdata[512]; |
| Blaze513 | 0:f3870f76a890 | 53 | unsigned char rdata[512]; |
| Blaze513 | 0:f3870f76a890 | 54 | int testaddress = 9; |
| Blaze513 | 0:f3870f76a890 | 55 | ///////////////////// |
| Blaze513 | 0:f3870f76a890 | 56 | |
| Blaze513 | 0:f3870f76a890 | 57 | //Initialize(); |
| Blaze513 | 0:f3870f76a890 | 58 | |
| Blaze513 | 0:f3870f76a890 | 59 | /*for(unsigned short j = 0; j < 512; j++) |
| Blaze513 | 0:f3870f76a890 | 60 | { |
| Blaze513 | 0:f3870f76a890 | 61 | wdata[j] = 0x00; |
| Blaze513 | 0:f3870f76a890 | 62 | } |
| Blaze513 | 0:f3870f76a890 | 63 | Write(testaddress, wdata); |
| Blaze513 | 0:f3870f76a890 | 64 | Read(testaddress, rdata); |
| Blaze513 | 0:f3870f76a890 | 65 | for(unsigned short j = 0; j < 512; j++) |
| Blaze513 | 0:f3870f76a890 | 66 | { |
| Blaze513 | 0:f3870f76a890 | 67 | Computer.putc(rdata[j]); |
| Blaze513 | 0:f3870f76a890 | 68 | } |
| Blaze513 | 0:f3870f76a890 | 69 | for(unsigned short j = 0; j < 512; j++) |
| Blaze513 | 0:f3870f76a890 | 70 | { |
| Blaze513 | 0:f3870f76a890 | 71 | wdata[j] = 0x00 + j; |
| Blaze513 | 0:f3870f76a890 | 72 | } |
| Blaze513 | 0:f3870f76a890 | 73 | Write(testaddress, wdata); |
| Blaze513 | 0:f3870f76a890 | 74 | Read(testaddress, rdata); |
| Blaze513 | 0:f3870f76a890 | 75 | for(unsigned short j = 0; j < 512; j++) |
| Blaze513 | 0:f3870f76a890 | 76 | { |
| Blaze513 | 0:f3870f76a890 | 77 | Computer.putc(rdata[j]); |
| Blaze513 | 0:f3870f76a890 | 78 | }*/ |
| Blaze513 | 0:f3870f76a890 | 79 | |
| Blaze513 | 0:f3870f76a890 | 80 | ///////////////////// |
| Blaze513 | 0:f3870f76a890 | 81 | if (Initialize()) |
| Blaze513 | 0:f3870f76a890 | 82 | { |
| Blaze513 | 0:f3870f76a890 | 83 | while(1) |
| Blaze513 | 0:f3870f76a890 | 84 | { |
| Blaze513 | 0:f3870f76a890 | 85 | led1 = !led1; |
| Blaze513 | 0:f3870f76a890 | 86 | wait_ms(250); |
| Blaze513 | 0:f3870f76a890 | 87 | led2 = !led2; |
| Blaze513 | 0:f3870f76a890 | 88 | wait_ms(250); |
| Blaze513 | 0:f3870f76a890 | 89 | led3 = !led3; |
| Blaze513 | 0:f3870f76a890 | 90 | wait_ms(250); |
| Blaze513 | 0:f3870f76a890 | 91 | led4 = !led4; |
| Blaze513 | 0:f3870f76a890 | 92 | wait_ms(250); |
| Blaze513 | 0:f3870f76a890 | 93 | } |
| Blaze513 | 0:f3870f76a890 | 94 | }//victory dance |
| Blaze513 | 0:f3870f76a890 | 95 | else |
| Blaze513 | 0:f3870f76a890 | 96 | { |
| Blaze513 | 0:f3870f76a890 | 97 | while(1) |
| Blaze513 | 0:f3870f76a890 | 98 | { |
| Blaze513 | 0:f3870f76a890 | 99 | |
| Blaze513 | 0:f3870f76a890 | 100 | led1 = !led1; |
| Blaze513 | 0:f3870f76a890 | 101 | led2 = !led2; |
| Blaze513 | 0:f3870f76a890 | 102 | led3 = !led3; |
| Blaze513 | 0:f3870f76a890 | 103 | led4 = !led4; |
| Blaze513 | 0:f3870f76a890 | 104 | wait_ms(250); |
| Blaze513 | 0:f3870f76a890 | 105 | } |
| Blaze513 | 0:f3870f76a890 | 106 | }//failure |
| Blaze513 | 0:f3870f76a890 | 107 | //for testing |
| Blaze513 | 0:f3870f76a890 | 108 | ///////////////////// |
| Blaze513 | 0:f3870f76a890 | 109 | } |
| Blaze513 | 0:f3870f76a890 | 110 | |
| Blaze513 | 0:f3870f76a890 | 111 | bool Initialize() |
| Blaze513 | 0:f3870f76a890 | 112 | { |
| Blaze513 | 0:f3870f76a890 | 113 | Card.frequency(100000); |
| Blaze513 | 0:f3870f76a890 | 114 | //set universal speed |
| Blaze513 | 0:f3870f76a890 | 115 | cs = 1; |
| Blaze513 | 0:f3870f76a890 | 116 | //chip select is active low |
| Blaze513 | 0:f3870f76a890 | 117 | CRCMode = 1; |
| Blaze513 | 0:f3870f76a890 | 118 | //turn cyclic redundancy checks on |
| Blaze513 | 0:f3870f76a890 | 119 | |
| Blaze513 | 0:f3870f76a890 | 120 | GenerateCRCTable(1, 137, CommandCRCTable); |
| Blaze513 | 0:f3870f76a890 | 121 | //generate the command crc lookup table |
| Blaze513 | 0:f3870f76a890 | 122 | //(generator polynomial x^7 + x^3 + 1 converts to decimal 137) |
| Blaze513 | 0:f3870f76a890 | 123 | GenerateCRCTable(2, 69665, DataCRCTable); |
| Blaze513 | 0:f3870f76a890 | 124 | //generate the command crc lookup table |
| Blaze513 | 0:f3870f76a890 | 125 | //(generator polynomial x^16 + x^12 + x^5 + 1 converts to decimal 69665) |
| Blaze513 | 0:f3870f76a890 | 126 | |
| Blaze513 | 0:f3870f76a890 | 127 | for (unsigned char j = 0; j < 16; j++) |
| Blaze513 | 0:f3870f76a890 | 128 | { |
| Blaze513 | 0:f3870f76a890 | 129 | Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 130 | } |
| Blaze513 | 0:f3870f76a890 | 131 | //perform specified power up sequence |
| Blaze513 | 0:f3870f76a890 | 132 | |
| Blaze513 | 0:f3870f76a890 | 133 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 134 | { |
| Blaze513 | 0:f3870f76a890 | 135 | Command(0, 0, Workspace); |
| Blaze513 | 0:f3870f76a890 | 136 | //send command 0 to put the card into SPI mode |
| Blaze513 | 0:f3870f76a890 | 137 | if (Workspace[0] == 0x01) |
| Blaze513 | 0:f3870f76a890 | 138 | //check for idle mode |
| Blaze513 | 0:f3870f76a890 | 139 | { break; } |
| Blaze513 | 0:f3870f76a890 | 140 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 141 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 142 | } |
| Blaze513 | 0:f3870f76a890 | 143 | Computer.putc(0x1F); |
| Blaze513 | 0:f3870f76a890 | 144 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 145 | |
| Blaze513 | 0:f3870f76a890 | 146 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 147 | { |
| Blaze513 | 0:f3870f76a890 | 148 | Command(8, 426, Workspace); |
| Blaze513 | 0:f3870f76a890 | 149 | //voltage bits are 0x01 for 2.7V - 3.6V, |
| Blaze513 | 0:f3870f76a890 | 150 | //check pattern 0xAA, [00,00,01,AA] = 426 |
| Blaze513 | 0:f3870f76a890 | 151 | if ((Workspace[0] == 0x05) || ((Workspace[0] == 0x01) && |
| Blaze513 | 0:f3870f76a890 | 152 | ((Workspace[3] & 0x0F) == 0x01) && (Workspace[4] == 0xAA))) |
| Blaze513 | 0:f3870f76a890 | 153 | //check version, voltage acceptance, and check pattern |
| Blaze513 | 0:f3870f76a890 | 154 | { break; } |
| Blaze513 | 0:f3870f76a890 | 155 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 156 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 157 | } |
| Blaze513 | 0:f3870f76a890 | 158 | Version = Workspace[0] == 0x01; |
| Blaze513 | 0:f3870f76a890 | 159 | //store card version |
| Blaze513 | 0:f3870f76a890 | 160 | Computer.putc(0x3F); |
| Blaze513 | 0:f3870f76a890 | 161 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 162 | Computer.putc(Version); |
| Blaze513 | 0:f3870f76a890 | 163 | |
| Blaze513 | 0:f3870f76a890 | 164 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 165 | { |
| Blaze513 | 0:f3870f76a890 | 166 | Command(58, 0, Workspace); |
| Blaze513 | 0:f3870f76a890 | 167 | //check the OCR |
| Blaze513 | 0:f3870f76a890 | 168 | if ((Workspace[0] == 0x01) && ((Workspace[2] & 0x20) || (Workspace[2] & 0x10))) |
| Blaze513 | 0:f3870f76a890 | 169 | //check for correct operating voltage 3.3V |
| Blaze513 | 0:f3870f76a890 | 170 | { break; } |
| Blaze513 | 0:f3870f76a890 | 171 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 172 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 173 | } |
| Blaze513 | 0:f3870f76a890 | 174 | Computer.putc(0x4F); |
| Blaze513 | 0:f3870f76a890 | 175 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 176 | |
| Blaze513 | 0:f3870f76a890 | 177 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 178 | { |
| Blaze513 | 0:f3870f76a890 | 179 | Command(59, 1, Workspace); |
| Blaze513 | 0:f3870f76a890 | 180 | //send command 59 to turn on CRCs |
| Blaze513 | 0:f3870f76a890 | 181 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 182 | if (Workspace[0] == 0x01) |
| Blaze513 | 0:f3870f76a890 | 183 | { break; } |
| Blaze513 | 0:f3870f76a890 | 184 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 185 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 186 | } |
| Blaze513 | 0:f3870f76a890 | 187 | Computer.putc(0x2F); |
| Blaze513 | 0:f3870f76a890 | 188 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 189 | |
| Blaze513 | 0:f3870f76a890 | 190 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 191 | { |
| Blaze513 | 0:f3870f76a890 | 192 | Command(55, 0, Workspace); |
| Blaze513 | 0:f3870f76a890 | 193 | //specify application-specific command |
| Blaze513 | 0:f3870f76a890 | 194 | Command(41, 1073741824, Workspace); |
| Blaze513 | 0:f3870f76a890 | 195 | //specify host supports high capacity cards |
| Blaze513 | 0:f3870f76a890 | 196 | //[40,00,00,00] = 1073741824 |
| Blaze513 | 0:f3870f76a890 | 197 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 198 | //check if card is ready |
| Blaze513 | 0:f3870f76a890 | 199 | { break; } |
| Blaze513 | 0:f3870f76a890 | 200 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 201 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 202 | } |
| Blaze513 | 0:f3870f76a890 | 203 | Computer.putc(0x5F); |
| Blaze513 | 0:f3870f76a890 | 204 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 205 | |
| Blaze513 | 0:f3870f76a890 | 206 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 207 | { |
| Blaze513 | 0:f3870f76a890 | 208 | Command(58, 0, Workspace); |
| Blaze513 | 0:f3870f76a890 | 209 | //check the OCR again |
| Blaze513 | 0:f3870f76a890 | 210 | if ((Workspace[0] == 0x00) && (Workspace[1] & 0x80)) |
| Blaze513 | 0:f3870f76a890 | 211 | { break; } |
| Blaze513 | 0:f3870f76a890 | 212 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 213 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 214 | } |
| Blaze513 | 0:f3870f76a890 | 215 | for (unsigned char j = 0; j < 4; j++) |
| Blaze513 | 0:f3870f76a890 | 216 | { |
| Blaze513 | 0:f3870f76a890 | 217 | OCR[j] = Workspace[j + 1]; |
| Blaze513 | 0:f3870f76a890 | 218 | } |
| Blaze513 | 0:f3870f76a890 | 219 | //record OCR |
| Blaze513 | 0:f3870f76a890 | 220 | Capacity = (OCR[0] & 0x40) == 0x40; |
| Blaze513 | 0:f3870f76a890 | 221 | //record capacity |
| Blaze513 | 0:f3870f76a890 | 222 | Computer.putc(0x6F); |
| Blaze513 | 0:f3870f76a890 | 223 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 224 | Computer.putc(Capacity); |
| Blaze513 | 0:f3870f76a890 | 225 | |
| Blaze513 | 0:f3870f76a890 | 226 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 227 | { |
| Blaze513 | 0:f3870f76a890 | 228 | Command(9, 0, Workspace); |
| Blaze513 | 0:f3870f76a890 | 229 | //read the card-specific data register |
| Blaze513 | 0:f3870f76a890 | 230 | cs = 0; |
| Blaze513 | 0:f3870f76a890 | 231 | for (unsigned int k = 0; k < 8192; k++) |
| Blaze513 | 0:f3870f76a890 | 232 | { |
| Blaze513 | 0:f3870f76a890 | 233 | if (Card.write(0xFF) == 0xFE) |
| Blaze513 | 0:f3870f76a890 | 234 | { break; } |
| Blaze513 | 0:f3870f76a890 | 235 | } |
| Blaze513 | 0:f3870f76a890 | 236 | //get to the start-data-block token |
| Blaze513 | 0:f3870f76a890 | 237 | for (unsigned char k = 0; k < 16; k++) |
| Blaze513 | 0:f3870f76a890 | 238 | { |
| Blaze513 | 0:f3870f76a890 | 239 | CSD[k] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 240 | } |
| Blaze513 | 0:f3870f76a890 | 241 | Workspace[3] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 242 | Workspace[4] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 243 | cs = 1; |
| Blaze513 | 0:f3870f76a890 | 244 | Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 245 | DataCRC(16, CSD, Workspace); |
| Blaze513 | 0:f3870f76a890 | 246 | //calculate the CSD data CRC |
| Blaze513 | 0:f3870f76a890 | 247 | Workspace[0] = 0; |
| Blaze513 | 0:f3870f76a890 | 248 | for (unsigned char k = 0; k < 15; k++) |
| Blaze513 | 0:f3870f76a890 | 249 | { |
| Blaze513 | 0:f3870f76a890 | 250 | Workspace[0] = CommandCRCTable[Workspace[0]] ^ CSD[k]; |
| Blaze513 | 0:f3870f76a890 | 251 | } |
| Blaze513 | 0:f3870f76a890 | 252 | Workspace[0] = CommandCRCTable[Workspace[0]] | 0x01; |
| Blaze513 | 0:f3870f76a890 | 253 | if ((Workspace[0] == CSD[15]) && (Workspace[1] == Workspace[3]) && (Workspace[2] == Workspace[4])) |
| Blaze513 | 0:f3870f76a890 | 254 | { break; } |
| Blaze513 | 0:f3870f76a890 | 255 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 256 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 257 | } |
| Blaze513 | 0:f3870f76a890 | 258 | Computer.putc(0x7F); |
| Blaze513 | 0:f3870f76a890 | 259 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 260 | Computer.putc(CSD[3] & 0x7F); |
| Blaze513 | 0:f3870f76a890 | 261 | |
| Blaze513 | 0:f3870f76a890 | 262 | if (((CSD[3] & 0x07) > 2) || ((CSD[3] & 0x7F) > 0x32)) |
| Blaze513 | 0:f3870f76a890 | 263 | { |
| Blaze513 | 0:f3870f76a890 | 264 | Card.frequency(25000000); |
| Blaze513 | 0:f3870f76a890 | 265 | //maximum speed is given at 25MHz |
| Blaze513 | 0:f3870f76a890 | 266 | } |
| Blaze513 | 0:f3870f76a890 | 267 | else |
| Blaze513 | 0:f3870f76a890 | 268 | { |
| Blaze513 | 0:f3870f76a890 | 269 | Workspace[0] = 1; |
| Blaze513 | 0:f3870f76a890 | 270 | for (unsigned char j = 0; j < (CSD[3] & 0x07); j++) |
| Blaze513 | 0:f3870f76a890 | 271 | { |
| Blaze513 | 0:f3870f76a890 | 272 | Workspace[0] *= 10; |
| Blaze513 | 0:f3870f76a890 | 273 | //the first three bits are a power of ten multiplier for speed |
| Blaze513 | 0:f3870f76a890 | 274 | } |
| Blaze513 | 0:f3870f76a890 | 275 | switch (CSD[3] & 0x78) |
| Blaze513 | 0:f3870f76a890 | 276 | { |
| Blaze513 | 0:f3870f76a890 | 277 | case 0x08: Card.frequency(Workspace[0] * 100000); break; |
| Blaze513 | 0:f3870f76a890 | 278 | case 0x10: Card.frequency(Workspace[0] * 120000); break; |
| Blaze513 | 0:f3870f76a890 | 279 | case 0x18: Card.frequency(Workspace[0] * 140000); break; |
| Blaze513 | 0:f3870f76a890 | 280 | case 0x20: Card.frequency(Workspace[0] * 150000); break; |
| Blaze513 | 0:f3870f76a890 | 281 | case 0x28: Card.frequency(Workspace[0] * 200000); break; |
| Blaze513 | 0:f3870f76a890 | 282 | case 0x30: Card.frequency(Workspace[0] * 250000); break; |
| Blaze513 | 0:f3870f76a890 | 283 | case 0x38: Card.frequency(Workspace[0] * 300000); break; |
| Blaze513 | 0:f3870f76a890 | 284 | case 0x40: Card.frequency(Workspace[0] * 350000); break; |
| Blaze513 | 0:f3870f76a890 | 285 | case 0x48: Card.frequency(Workspace[0] * 400000); break; |
| Blaze513 | 0:f3870f76a890 | 286 | case 0x50: Card.frequency(Workspace[0] * 450000); break; |
| Blaze513 | 0:f3870f76a890 | 287 | case 0x58: Card.frequency(Workspace[0] * 500000); break; |
| Blaze513 | 0:f3870f76a890 | 288 | case 0x60: Card.frequency(Workspace[0] * 550000); break; |
| Blaze513 | 0:f3870f76a890 | 289 | case 0x68: Card.frequency(Workspace[0] * 600000); break; |
| Blaze513 | 0:f3870f76a890 | 290 | case 0x70: Card.frequency(Workspace[0] * 700000); break; |
| Blaze513 | 0:f3870f76a890 | 291 | case 0x78: Card.frequency(Workspace[0] * 800000); break; |
| Blaze513 | 0:f3870f76a890 | 292 | default: break; |
| Blaze513 | 0:f3870f76a890 | 293 | //read the csd card speed bits and speed up card operations |
| Blaze513 | 0:f3870f76a890 | 294 | } |
| Blaze513 | 0:f3870f76a890 | 295 | } |
| Blaze513 | 0:f3870f76a890 | 296 | |
| Blaze513 | 0:f3870f76a890 | 297 | if (!Version) |
| Blaze513 | 0:f3870f76a890 | 298 | { |
| Blaze513 | 0:f3870f76a890 | 299 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 300 | { |
| Blaze513 | 0:f3870f76a890 | 301 | Command(16, 512, Workspace); |
| Blaze513 | 0:f3870f76a890 | 302 | //set data-block length to 512 bytes |
| Blaze513 | 0:f3870f76a890 | 303 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 304 | { break; } |
| Blaze513 | 0:f3870f76a890 | 305 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 306 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 307 | } |
| Blaze513 | 0:f3870f76a890 | 308 | } |
| Blaze513 | 0:f3870f76a890 | 309 | Computer.putc(0x8F); |
| Blaze513 | 0:f3870f76a890 | 310 | Computer.putc(Workspace[0]); |
| Blaze513 | 0:f3870f76a890 | 311 | ////////////////////////////////////////////implement data block sizing later |
| Blaze513 | 0:f3870f76a890 | 312 | return 1; |
| Blaze513 | 0:f3870f76a890 | 313 | } |
| Blaze513 | 0:f3870f76a890 | 314 | |
| Blaze513 | 0:f3870f76a890 | 315 | bool Write(unsigned int Address, unsigned char* Data) |
| Blaze513 | 0:f3870f76a890 | 316 | { |
| Blaze513 | 0:f3870f76a890 | 317 | if (Capacity) |
| Blaze513 | 0:f3870f76a890 | 318 | { |
| Blaze513 | 0:f3870f76a890 | 319 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 320 | { |
| Blaze513 | 0:f3870f76a890 | 321 | Command(24, Address, Workspace); |
| Blaze513 | 0:f3870f76a890 | 322 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 323 | { break; } |
| Blaze513 | 0:f3870f76a890 | 324 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 325 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 326 | } |
| Blaze513 | 0:f3870f76a890 | 327 | } |
| Blaze513 | 0:f3870f76a890 | 328 | else |
| Blaze513 | 0:f3870f76a890 | 329 | { |
| Blaze513 | 0:f3870f76a890 | 330 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 331 | { |
| Blaze513 | 0:f3870f76a890 | 332 | Command(24, Address * 512, Workspace);///////////implement block length |
| Blaze513 | 0:f3870f76a890 | 333 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 334 | { break; } |
| Blaze513 | 0:f3870f76a890 | 335 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 336 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 337 | } |
| Blaze513 | 0:f3870f76a890 | 338 | } |
| Blaze513 | 0:f3870f76a890 | 339 | cs = 0; |
| Blaze513 | 0:f3870f76a890 | 340 | Card.write(0xFE); |
| Blaze513 | 0:f3870f76a890 | 341 | //start data block token |
| Blaze513 | 0:f3870f76a890 | 342 | for (unsigned short j = 0; j < 512; j++) |
| Blaze513 | 0:f3870f76a890 | 343 | { |
| Blaze513 | 0:f3870f76a890 | 344 | Card.write(Data[j]); |
| Blaze513 | 0:f3870f76a890 | 345 | //write the data |
| Blaze513 | 0:f3870f76a890 | 346 | } |
| Blaze513 | 0:f3870f76a890 | 347 | DataCRC(512, Data, Workspace); |
| Blaze513 | 0:f3870f76a890 | 348 | Card.write(Workspace[1]); |
| Blaze513 | 0:f3870f76a890 | 349 | Card.write(Workspace[2]); |
| Blaze513 | 0:f3870f76a890 | 350 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 351 | { |
| Blaze513 | 0:f3870f76a890 | 352 | Workspace[0] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 353 | if ((Workspace[0] & 0x1F) == 0x05) |
| Blaze513 | 0:f3870f76a890 | 354 | { break; } |
| Blaze513 | 0:f3870f76a890 | 355 | } |
| Blaze513 | 0:f3870f76a890 | 356 | while (!Card.write(0xFF)); |
| Blaze513 | 0:f3870f76a890 | 357 | cs = 1; |
| Blaze513 | 0:f3870f76a890 | 358 | Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 359 | if ((Workspace[0] & 0x1F) == 0x05) |
| Blaze513 | 0:f3870f76a890 | 360 | { return 1; } |
| Blaze513 | 0:f3870f76a890 | 361 | else |
| Blaze513 | 0:f3870f76a890 | 362 | { |
| Blaze513 | 0:f3870f76a890 | 363 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 364 | { |
| Blaze513 | 0:f3870f76a890 | 365 | Command(13, 0, Workspace); |
| Blaze513 | 0:f3870f76a890 | 366 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 367 | { break; } |
| Blaze513 | 0:f3870f76a890 | 368 | } |
| Blaze513 | 0:f3870f76a890 | 369 | return 0; |
| Blaze513 | 0:f3870f76a890 | 370 | } |
| Blaze513 | 0:f3870f76a890 | 371 | } |
| Blaze513 | 0:f3870f76a890 | 372 | |
| Blaze513 | 0:f3870f76a890 | 373 | bool Read(unsigned int Address, unsigned char* Data) |
| Blaze513 | 0:f3870f76a890 | 374 | { |
| Blaze513 | 0:f3870f76a890 | 375 | if (Capacity) |
| Blaze513 | 0:f3870f76a890 | 376 | { |
| Blaze513 | 0:f3870f76a890 | 377 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 378 | { |
| Blaze513 | 0:f3870f76a890 | 379 | Command(17, Address, Workspace); |
| Blaze513 | 0:f3870f76a890 | 380 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 381 | { break; } |
| Blaze513 | 0:f3870f76a890 | 382 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 383 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 384 | } |
| Blaze513 | 0:f3870f76a890 | 385 | } |
| Blaze513 | 0:f3870f76a890 | 386 | else |
| Blaze513 | 0:f3870f76a890 | 387 | { |
| Blaze513 | 0:f3870f76a890 | 388 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 389 | { |
| Blaze513 | 0:f3870f76a890 | 390 | Command(17, Address * 512, Workspace);///////////implement block length |
| Blaze513 | 0:f3870f76a890 | 391 | if (Workspace[0] == 0x00) |
| Blaze513 | 0:f3870f76a890 | 392 | { break; } |
| Blaze513 | 0:f3870f76a890 | 393 | if (j == 8191) |
| Blaze513 | 0:f3870f76a890 | 394 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 395 | } |
| Blaze513 | 0:f3870f76a890 | 396 | } |
| Blaze513 | 0:f3870f76a890 | 397 | cs = 0; |
| Blaze513 | 0:f3870f76a890 | 398 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 399 | { |
| Blaze513 | 0:f3870f76a890 | 400 | if (Card.write(0xFF) == 0xFE) |
| Blaze513 | 0:f3870f76a890 | 401 | { break; } |
| Blaze513 | 0:f3870f76a890 | 402 | } |
| Blaze513 | 0:f3870f76a890 | 403 | for (unsigned short j = 0; j < 512; j++) |
| Blaze513 | 0:f3870f76a890 | 404 | { |
| Blaze513 | 0:f3870f76a890 | 405 | Data[j] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 406 | } |
| Blaze513 | 0:f3870f76a890 | 407 | Workspace[3] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 408 | Workspace[4] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 409 | cs = 1; |
| Blaze513 | 0:f3870f76a890 | 410 | Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 411 | DataCRC(512, Data, Workspace); |
| Blaze513 | 0:f3870f76a890 | 412 | if ((Workspace[1] == Workspace[3]) && (Workspace[2] == Workspace[4])) |
| Blaze513 | 0:f3870f76a890 | 413 | { return 1; } |
| Blaze513 | 0:f3870f76a890 | 414 | else |
| Blaze513 | 0:f3870f76a890 | 415 | { return 0; } |
| Blaze513 | 0:f3870f76a890 | 416 | } |
| Blaze513 | 0:f3870f76a890 | 417 | |
| Blaze513 | 0:f3870f76a890 | 418 | void Command(unsigned char Index, unsigned int Argument, unsigned char* Response) |
| Blaze513 | 0:f3870f76a890 | 419 | { |
| Blaze513 | 0:f3870f76a890 | 420 | cs = 0; |
| Blaze513 | 0:f3870f76a890 | 421 | //assert chip select low to synchronize command |
| Blaze513 | 0:f3870f76a890 | 422 | Card.write(0x40 | Index); |
| Blaze513 | 0:f3870f76a890 | 423 | //the index is assumed valid, commands start with "01b" |
| Blaze513 | 0:f3870f76a890 | 424 | Card.write(((char*)&Argument)[3]); |
| Blaze513 | 0:f3870f76a890 | 425 | Card.write(((char*)&Argument)[2]); |
| Blaze513 | 0:f3870f76a890 | 426 | Card.write(((char*)&Argument)[1]); |
| Blaze513 | 0:f3870f76a890 | 427 | Card.write(((char*)&Argument)[0]); |
| Blaze513 | 0:f3870f76a890 | 428 | //send the argument bytes in order from MSB to LSB (mbed is little endian) |
| Blaze513 | 0:f3870f76a890 | 429 | if (CRCMode) |
| Blaze513 | 0:f3870f76a890 | 430 | { Card.write(CommandCRC(&Index, &Argument)); } |
| Blaze513 | 0:f3870f76a890 | 431 | else |
| Blaze513 | 0:f3870f76a890 | 432 | { Card.write(0x00); } |
| Blaze513 | 0:f3870f76a890 | 433 | //send the command CRC |
| Blaze513 | 0:f3870f76a890 | 434 | for (unsigned int j = 0; j < 8192; j++) |
| Blaze513 | 0:f3870f76a890 | 435 | { |
| Blaze513 | 0:f3870f76a890 | 436 | Response[0] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 437 | //clock the card high to let it run operations, the first byte will be |
| Blaze513 | 0:f3870f76a890 | 438 | //busy (all high), the response will be sent some time later |
| Blaze513 | 0:f3870f76a890 | 439 | if (!(Response[0] & 0x80)) |
| Blaze513 | 0:f3870f76a890 | 440 | //check for a response by testing if the first bit is low |
| Blaze513 | 0:f3870f76a890 | 441 | { break; } |
| Blaze513 | 0:f3870f76a890 | 442 | } |
| Blaze513 | 0:f3870f76a890 | 443 | if ((Index == 8) || (Index == 13) || (Index == 58)) |
| Blaze513 | 0:f3870f76a890 | 444 | { |
| Blaze513 | 0:f3870f76a890 | 445 | for (unsigned char j = 1; j < 5; j++) |
| Blaze513 | 0:f3870f76a890 | 446 | { |
| Blaze513 | 0:f3870f76a890 | 447 | Response[j] = Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 448 | } |
| Blaze513 | 0:f3870f76a890 | 449 | //get the rest of the response |
| Blaze513 | 0:f3870f76a890 | 450 | } |
| Blaze513 | 0:f3870f76a890 | 451 | cs = 1; |
| Blaze513 | 0:f3870f76a890 | 452 | //assert chip select high to synchronize command |
| Blaze513 | 0:f3870f76a890 | 453 | Card.write(0xFF); |
| Blaze513 | 0:f3870f76a890 | 454 | //clock the deselected card high to complete processing for some cards |
| Blaze513 | 0:f3870f76a890 | 455 | } |
| Blaze513 | 0:f3870f76a890 | 456 | |
| Blaze513 | 0:f3870f76a890 | 457 | char CommandCRC(unsigned char* IndexPtr, unsigned int* ArgumentPtr) |
| Blaze513 | 0:f3870f76a890 | 458 | { |
| Blaze513 | 0:f3870f76a890 | 459 | return |
| Blaze513 | 0:f3870f76a890 | 460 | CommandCRCTable[ |
| Blaze513 | 0:f3870f76a890 | 461 | CommandCRCTable[ |
| Blaze513 | 0:f3870f76a890 | 462 | CommandCRCTable[ |
| Blaze513 | 0:f3870f76a890 | 463 | CommandCRCTable[ |
| Blaze513 | 0:f3870f76a890 | 464 | CommandCRCTable[ |
| Blaze513 | 0:f3870f76a890 | 465 | *IndexPtr | 0x40 |
| Blaze513 | 0:f3870f76a890 | 466 | ] ^ ((char*)ArgumentPtr)[3] |
| Blaze513 | 0:f3870f76a890 | 467 | ] ^ ((char*)ArgumentPtr)[2] |
| Blaze513 | 0:f3870f76a890 | 468 | ] ^ ((char*)ArgumentPtr)[1] |
| Blaze513 | 0:f3870f76a890 | 469 | ] ^ ((char*)ArgumentPtr)[0] |
| Blaze513 | 0:f3870f76a890 | 470 | ] | 0x01; |
| Blaze513 | 0:f3870f76a890 | 471 | //using a CRC table, the CRC result of a byte is equal to the byte in the table at the |
| Blaze513 | 0:f3870f76a890 | 472 | //address equal to the input byte, a message CRC is obtained by successively XORing these |
| Blaze513 | 0:f3870f76a890 | 473 | //with the message bytes |
| Blaze513 | 0:f3870f76a890 | 474 | } |
| Blaze513 | 0:f3870f76a890 | 475 | |
| Blaze513 | 0:f3870f76a890 | 476 | void DataCRC(unsigned short Length, unsigned char* Data, unsigned char* Result) |
| Blaze513 | 0:f3870f76a890 | 477 | { |
| Blaze513 | 0:f3870f76a890 | 478 | Result[1] = 0x00; |
| Blaze513 | 0:f3870f76a890 | 479 | Result[2] = 0x00; |
| Blaze513 | 0:f3870f76a890 | 480 | //initialize result carrier |
| Blaze513 | 0:f3870f76a890 | 481 | for (int i = 0; i < Length; i++) |
| Blaze513 | 0:f3870f76a890 | 482 | //step through each byte of the data to be checked |
| Blaze513 | 0:f3870f76a890 | 483 | { |
| Blaze513 | 0:f3870f76a890 | 484 | Result[0] = Result[1]; |
| Blaze513 | 0:f3870f76a890 | 485 | //record current crc lookup for both bytes |
| Blaze513 | 0:f3870f76a890 | 486 | Result[1] = DataCRCTable[2 * Result[0]] ^ Result[2]; |
| Blaze513 | 0:f3870f76a890 | 487 | //new fist byte result is XORed with old second byte result |
| Blaze513 | 0:f3870f76a890 | 488 | Result[2] = DataCRCTable[(2 * Result[0]) + 1] ^ Data[i]; |
| Blaze513 | 0:f3870f76a890 | 489 | //new second byte result is XORed with new data byte |
| Blaze513 | 0:f3870f76a890 | 490 | } |
| Blaze513 | 0:f3870f76a890 | 491 | for (int i = 0; i < 2; i++) |
| Blaze513 | 0:f3870f76a890 | 492 | //the final result must be XORed with two 0x00 bytes. |
| Blaze513 | 0:f3870f76a890 | 493 | { |
| Blaze513 | 0:f3870f76a890 | 494 | Result[0] = Result[1]; |
| Blaze513 | 0:f3870f76a890 | 495 | Result[1] = DataCRCTable[2 * Result[0]] ^ Result[2]; |
| Blaze513 | 0:f3870f76a890 | 496 | Result[2] = DataCRCTable[(2 * Result[0]) + 1]; |
| Blaze513 | 0:f3870f76a890 | 497 | } |
| Blaze513 | 0:f3870f76a890 | 498 | } |
| Blaze513 | 0:f3870f76a890 | 499 | |
| Blaze513 | 0:f3870f76a890 | 500 | void GenerateCRCTable(unsigned char Size, unsigned long long Generator, unsigned char* Table) |
| Blaze513 | 0:f3870f76a890 | 501 | { |
| Blaze513 | 0:f3870f76a890 | 502 | unsigned char Index[9] = {0, 0, 0, 0, 0, 0, 0, 0, 0}; |
| Blaze513 | 0:f3870f76a890 | 503 | //this will hold information from the generator; the position indicates the |
| Blaze513 | 0:f3870f76a890 | 504 | //order of the encountered 1, the value indicates its position in the |
| Blaze513 | 0:f3870f76a890 | 505 | //generator, the 9th entry indicates the number of 1's encountered |
| Blaze513 | 0:f3870f76a890 | 506 | for (int i = 0; i < 64; i++) |
| Blaze513 | 0:f3870f76a890 | 507 | { |
| Blaze513 | 0:f3870f76a890 | 508 | if (((char*)&Generator)[7] & 0x80) |
| Blaze513 | 0:f3870f76a890 | 509 | { break; } |
| Blaze513 | 0:f3870f76a890 | 510 | Generator = Generator << 1; |
| Blaze513 | 0:f3870f76a890 | 511 | //shift generator so that the first bit is high |
| Blaze513 | 0:f3870f76a890 | 512 | } |
| Blaze513 | 0:f3870f76a890 | 513 | for (unsigned char k = 0; k < Size; k++) |
| Blaze513 | 0:f3870f76a890 | 514 | { |
| Blaze513 | 0:f3870f76a890 | 515 | Table[k] = 0x00; |
| Blaze513 | 0:f3870f76a890 | 516 | //initialize the first CRC bytes |
| Blaze513 | 0:f3870f76a890 | 517 | } |
| Blaze513 | 0:f3870f76a890 | 518 | for (unsigned char i = 0; i < 8; i++) |
| Blaze513 | 0:f3870f76a890 | 519 | //increment through each generator bit |
| Blaze513 | 0:f3870f76a890 | 520 | { |
| Blaze513 | 0:f3870f76a890 | 521 | if ((0x80 >> i) & ((unsigned char*)&Generator)[7]) |
| Blaze513 | 0:f3870f76a890 | 522 | //if a 1 is encountered in the generator |
| Blaze513 | 0:f3870f76a890 | 523 | { |
| Blaze513 | 0:f3870f76a890 | 524 | Index[Index[8]] = i; |
| Blaze513 | 0:f3870f76a890 | 525 | Index[8]++; |
| Blaze513 | 0:f3870f76a890 | 526 | //record its order and location and increment the counter |
| Blaze513 | 0:f3870f76a890 | 527 | } |
| Blaze513 | 0:f3870f76a890 | 528 | for (unsigned char j = 0; j < (0x01 << i); j++) |
| Blaze513 | 0:f3870f76a890 | 529 | //each bit increases the number of xor operations by a power of 2 |
| Blaze513 | 0:f3870f76a890 | 530 | { |
| Blaze513 | 0:f3870f76a890 | 531 | for (unsigned char k = 0; k < Size; k++) |
| Blaze513 | 0:f3870f76a890 | 532 | //we need to perform operations for each byte in the CRC result |
| Blaze513 | 0:f3870f76a890 | 533 | { |
| Blaze513 | 0:f3870f76a890 | 534 | Table[(Size * ((0x01 << i) + j)) + k] = Table[(Size * j) + k]; |
| Blaze513 | 0:f3870f76a890 | 535 | //each new power is equal to all previous entries with an added xor |
| Blaze513 | 0:f3870f76a890 | 536 | //on the leftmost bit and each succeeding 1 on the generator |
| Blaze513 | 0:f3870f76a890 | 537 | for (unsigned char l = 0; l < Index[8]; l++) |
| Blaze513 | 0:f3870f76a890 | 538 | //increment through the encountered generator 1s |
| Blaze513 | 0:f3870f76a890 | 539 | { |
| Blaze513 | 0:f3870f76a890 | 540 | Table[(Size * ((0x01 << i) + j)) + k] ^= (((unsigned char*)&Generator)[7-k] << (i + 1 - Index[l])); |
| Blaze513 | 0:f3870f76a890 | 541 | Table[(Size * ((0x01 << i) + j)) + k] ^= (((unsigned char*)&Generator)[6-k] >> (7 - i + Index[l])); |
| Blaze513 | 0:f3870f76a890 | 542 | //xor the new bit and the new generator 1s |
| Blaze513 | 0:f3870f76a890 | 543 | } |
| Blaze513 | 0:f3870f76a890 | 544 | } |
| Blaze513 | 0:f3870f76a890 | 545 | } |
| Blaze513 | 0:f3870f76a890 | 546 | } |
| Blaze513 | 0:f3870f76a890 | 547 | } |