Pradeep Kotipalli / Mbed 2 deprecated CDMS_DEC_2015

cdms_update

Dependencies:   FreescaleIAP mbed-rtos mbed

Fork of CDMS_SD_MNG_OVERDRIVE by saikiran cholleti

cdms_sd.cpp@0:bcbd76c86cde, 2015-12-16 (annotated)

Committer:
cholletisaik777
Date:
Wed Dec 16 09:06:59 2015 +0000
Revision:
0:bcbd76c86cde
Child:
1:ad3b8a8032e2
nnb

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cholletisaik777 0:bcbd76c86cde 1 #include "cdms_sd.h"
cholletisaik777 0:bcbd76c86cde 2
cholletisaik777 0:bcbd76c86cde 3 SPI spi_sd(PTE1, PTE3, PTE2); // MOSI,MISO, CLOCK microcontroller(in order)
cholletisaik777 0:bcbd76c86cde 4 DigitalOut cs_sd(PTE22);
cholletisaik777 0:bcbd76c86cde 5
cholletisaik777 0:bcbd76c86cde 6 Serial sd1(USBTX,USBRX);
cholletisaik777 0:bcbd76c86cde 7
cholletisaik777 0:bcbd76c86cde 8 int cdv;
cholletisaik777 0:bcbd76c86cde 9 uint64_t sd_sectors();
cholletisaik777 0:bcbd76c86cde 10 uint64_t sectors;
cholletisaik777 0:bcbd76c86cde 11
cholletisaik777 0:bcbd76c86cde 12 void FCTN_SD_MNGR()
cholletisaik777 0:bcbd76c86cde 13 {
cholletisaik777 0:bcbd76c86cde 14 /*Size of block of SD card for 2GB = 512B, 4 , 8 GB SD card. We will prefer 8 GB.
cholletisaik777 0:bcbd76c86cde 15 SD allocation. Assuming 8GB
cholletisaik777 0:bcbd76c86cde 16 SCP: 600 MB -122880
cholletisaik777 0:bcbd76c86cde 17 SFF-AT: 2 GB -4194304
cholletisaik777 0:bcbd76c86cde 18 SFF-BT: 5 GB -10485760
cholletisaik777 0:bcbd76c86cde 19 HK-ARCH:100 MB -204800
cholletisaik777 0:bcbd76c86cde 20 LOG: 50MB -102400
cholletisaik777 0:bcbd76c86cde 21 SD card management: 50MB - 102400*/
cholletisaik777 0:bcbd76c86cde 22
cholletisaik777 0:bcbd76c86cde 23 }
cholletisaik777 0:bcbd76c86cde 24 int initialise_card()
cholletisaik777 0:bcbd76c86cde 25 {
cholletisaik777 0:bcbd76c86cde 26 // Set to 100kHz for initialisation, and clock card with cs_sd = 1
cholletisaik777 0:bcbd76c86cde 27 spi_sd.frequency(100000);
cholletisaik777 0:bcbd76c86cde 28 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 29 for (int i = 0; i < 16; i++) {
cholletisaik777 0:bcbd76c86cde 30 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 31 }
cholletisaik777 0:bcbd76c86cde 32
cholletisaik777 0:bcbd76c86cde 33 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
cholletisaik777 0:bcbd76c86cde 34 if (cmd(0, 0) != R1_IDLE_STATE) {
cholletisaik777 0:bcbd76c86cde 35 debug("No disk, or could not put SD card in to spi_sd idle state\r\n");
cholletisaik777 0:bcbd76c86cde 36 return SDCARD_FAIL;
cholletisaik777 0:bcbd76c86cde 37 }
cholletisaik777 0:bcbd76c86cde 38
cholletisaik777 0:bcbd76c86cde 39 // send CMD8 to determine whther it is ver 2.x
cholletisaik777 0:bcbd76c86cde 40 int r = cmd8();
cholletisaik777 0:bcbd76c86cde 41 if (r == R1_IDLE_STATE) {
cholletisaik777 0:bcbd76c86cde 42 printf("\rEntering v2\r\n");
cholletisaik777 0:bcbd76c86cde 43 return initialise_card_v2();
cholletisaik777 0:bcbd76c86cde 44
cholletisaik777 0:bcbd76c86cde 45 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
cholletisaik777 0:bcbd76c86cde 46 printf("\rEntering v1\r\n");
cholletisaik777 0:bcbd76c86cde 47 return initialise_card_v1();
cholletisaik777 0:bcbd76c86cde 48
cholletisaik777 0:bcbd76c86cde 49 } else {
cholletisaik777 0:bcbd76c86cde 50 debug("\rNot in idle state after sending CMD8 (not an SD card?)\r\n");
cholletisaik777 0:bcbd76c86cde 51 return SDCARD_FAIL;
cholletisaik777 0:bcbd76c86cde 52 }
cholletisaik777 0:bcbd76c86cde 53 }
cholletisaik777 0:bcbd76c86cde 54
cholletisaik777 0:bcbd76c86cde 55 int initialise_card_v1()
cholletisaik777 0:bcbd76c86cde 56 {
cholletisaik777 0:bcbd76c86cde 57 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:bcbd76c86cde 58 cmd(55, 0);
cholletisaik777 0:bcbd76c86cde 59 if (cmd(41, 0) == 0) {
cholletisaik777 0:bcbd76c86cde 60 printf("\rv1 initialization successfull\r\n");
cholletisaik777 0:bcbd76c86cde 61 cdv = 512;
cholletisaik777 0:bcbd76c86cde 62 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
cholletisaik777 0:bcbd76c86cde 63
cholletisaik777 0:bcbd76c86cde 64 return SDCARD_V1;
cholletisaik777 0:bcbd76c86cde 65 }
cholletisaik777 0:bcbd76c86cde 66 }
cholletisaik777 0:bcbd76c86cde 67
cholletisaik777 0:bcbd76c86cde 68 debug("\rTimeout waiting for v1.x card\r\n");
cholletisaik777 0:bcbd76c86cde 69 return SDCARD_FAIL;
cholletisaik777 0:bcbd76c86cde 70 }
cholletisaik777 0:bcbd76c86cde 71
cholletisaik777 0:bcbd76c86cde 72
cholletisaik777 0:bcbd76c86cde 73 int initialise_card_v2()
cholletisaik777 0:bcbd76c86cde 74 {
cholletisaik777 0:bcbd76c86cde 75 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:bcbd76c86cde 76 wait_ms(50);
cholletisaik777 0:bcbd76c86cde 77 cmd58();
cholletisaik777 0:bcbd76c86cde 78 cmd(55, 0);
cholletisaik777 0:bcbd76c86cde 79 if (cmd(41, 0x40000000) == 0) {
cholletisaik777 0:bcbd76c86cde 80 printf("\rv2 initialization successfull\r\n");
cholletisaik777 0:bcbd76c86cde 81 cmd58();
cholletisaik777 0:bcbd76c86cde 82 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
cholletisaik777 0:bcbd76c86cde 83 cdv = 1;
cholletisaik777 0:bcbd76c86cde 84
cholletisaik777 0:bcbd76c86cde 85 return SDCARD_V2;
cholletisaik777 0:bcbd76c86cde 86 }
cholletisaik777 0:bcbd76c86cde 87 }
cholletisaik777 0:bcbd76c86cde 88
cholletisaik777 0:bcbd76c86cde 89 debug("\rTimeout waiting for v2.x card\r\n");
cholletisaik777 0:bcbd76c86cde 90 return SDCARD_FAIL;
cholletisaik777 0:bcbd76c86cde 91 }
cholletisaik777 0:bcbd76c86cde 92
cholletisaik777 0:bcbd76c86cde 93 int cmd(int cmd, int arg)
cholletisaik777 0:bcbd76c86cde 94 {
cholletisaik777 0:bcbd76c86cde 95 cs_sd = 0;
cholletisaik777 0:bcbd76c86cde 96
cholletisaik777 0:bcbd76c86cde 97 // send a command
cholletisaik777 0:bcbd76c86cde 98 spi_sd.write(0x40 | cmd);
cholletisaik777 0:bcbd76c86cde 99 spi_sd.write(arg >> 24);
cholletisaik777 0:bcbd76c86cde 100 spi_sd.write(arg >> 16);
cholletisaik777 0:bcbd76c86cde 101 spi_sd.write(arg >> 8);
cholletisaik777 0:bcbd76c86cde 102 spi_sd.write(arg >> 0);
cholletisaik777 0:bcbd76c86cde 103 spi_sd.write(0x95);
cholletisaik777 0:bcbd76c86cde 104
cholletisaik777 0:bcbd76c86cde 105 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:bcbd76c86cde 106 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:bcbd76c86cde 107 int response = spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 108 if (!(response & 0x80)) {
cholletisaik777 0:bcbd76c86cde 109 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 110 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 111 return response;
cholletisaik777 0:bcbd76c86cde 112 }
cholletisaik777 0:bcbd76c86cde 113 }
cholletisaik777 0:bcbd76c86cde 114 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 115 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 116 return -1; // timeout
cholletisaik777 0:bcbd76c86cde 117 }
cholletisaik777 0:bcbd76c86cde 118
cholletisaik777 0:bcbd76c86cde 119
cholletisaik777 0:bcbd76c86cde 120 int cmd58()
cholletisaik777 0:bcbd76c86cde 121 {
cholletisaik777 0:bcbd76c86cde 122 cs_sd = 0;
cholletisaik777 0:bcbd76c86cde 123 int arg = 0;
cholletisaik777 0:bcbd76c86cde 124
cholletisaik777 0:bcbd76c86cde 125 // send a command
cholletisaik777 0:bcbd76c86cde 126 spi_sd.write(0x40 | 58);
cholletisaik777 0:bcbd76c86cde 127 spi_sd.write(arg >> 24);
cholletisaik777 0:bcbd76c86cde 128 spi_sd.write(arg >> 16);
cholletisaik777 0:bcbd76c86cde 129 spi_sd.write(arg >> 8);
cholletisaik777 0:bcbd76c86cde 130 spi_sd.write(arg >> 0);
cholletisaik777 0:bcbd76c86cde 131 spi_sd.write(0x95);
cholletisaik777 0:bcbd76c86cde 132
cholletisaik777 0:bcbd76c86cde 133 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:bcbd76c86cde 134 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:bcbd76c86cde 135 int response = spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 136 if (!(response & 0x80)) {
cholletisaik777 0:bcbd76c86cde 137 int ocr = spi_sd.write(0xFF) << 24;
cholletisaik777 0:bcbd76c86cde 138 ocr |= spi_sd.write(0xFF) << 16;
cholletisaik777 0:bcbd76c86cde 139 ocr |= spi_sd.write(0xFF) << 8;
cholletisaik777 0:bcbd76c86cde 140 ocr |= spi_sd.write(0xFF) << 0;
cholletisaik777 0:bcbd76c86cde 141 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 142 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 143 return response;
cholletisaik777 0:bcbd76c86cde 144 }
cholletisaik777 0:bcbd76c86cde 145 }
cholletisaik777 0:bcbd76c86cde 146 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 147 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 148 return -1; // timeout
cholletisaik777 0:bcbd76c86cde 149 }
cholletisaik777 0:bcbd76c86cde 150
cholletisaik777 0:bcbd76c86cde 151
cholletisaik777 0:bcbd76c86cde 152 int cmd8()
cholletisaik777 0:bcbd76c86cde 153 {
cholletisaik777 0:bcbd76c86cde 154 cs_sd = 0;
cholletisaik777 0:bcbd76c86cde 155
cholletisaik777 0:bcbd76c86cde 156 // send a command
cholletisaik777 0:bcbd76c86cde 157 spi_sd.write(0x40 | 8); // CMD8
cholletisaik777 0:bcbd76c86cde 158 spi_sd.write(0x00); // reserved
cholletisaik777 0:bcbd76c86cde 159 spi_sd.write(0x00); // reserved
cholletisaik777 0:bcbd76c86cde 160 spi_sd.write(0x01); // 3.3v
cholletisaik777 0:bcbd76c86cde 161 spi_sd.write(0xAA); // check pattern
cholletisaik777 0:bcbd76c86cde 162 spi_sd.write(0x87); // crc
cholletisaik777 0:bcbd76c86cde 163
cholletisaik777 0:bcbd76c86cde 164 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:bcbd76c86cde 165 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
cholletisaik777 0:bcbd76c86cde 166 char response[5];
cholletisaik777 0:bcbd76c86cde 167 response[0] = spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 168 if (!(response[0] & 0x80)) {
cholletisaik777 0:bcbd76c86cde 169 for (int j = 1; j < 5; j++) {
cholletisaik777 0:bcbd76c86cde 170 response[i] = spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 171 }
cholletisaik777 0:bcbd76c86cde 172 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 173 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 174 return response[0];
cholletisaik777 0:bcbd76c86cde 175 }
cholletisaik777 0:bcbd76c86cde 176 }
cholletisaik777 0:bcbd76c86cde 177 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 178 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 179 return -1; // timeout
cholletisaik777 0:bcbd76c86cde 180 }
cholletisaik777 0:bcbd76c86cde 181
cholletisaik777 0:bcbd76c86cde 182 uint64_t sd_sectors()
cholletisaik777 0:bcbd76c86cde 183 {
cholletisaik777 0:bcbd76c86cde 184 uint32_t c_size, c_size_mult, read_bl_len;
cholletisaik777 0:bcbd76c86cde 185 uint32_t block_len, mult, blocknr, capacity;
cholletisaik777 0:bcbd76c86cde 186 uint32_t hc_c_size;
cholletisaik777 0:bcbd76c86cde 187 uint64_t blocks;
cholletisaik777 0:bcbd76c86cde 188
cholletisaik777 0:bcbd76c86cde 189 // CMD9, Response R2 (R1 byte + 16-byte block read)
cholletisaik777 0:bcbd76c86cde 190 if (cmdx(9, 0) != 0) {
cholletisaik777 0:bcbd76c86cde 191 debug("\rDidn't get a response from the disk\n");
cholletisaik777 0:bcbd76c86cde 192 return 0;
cholletisaik777 0:bcbd76c86cde 193 }
cholletisaik777 0:bcbd76c86cde 194
cholletisaik777 0:bcbd76c86cde 195 uint8_t cs_sdd[16];
cholletisaik777 0:bcbd76c86cde 196 if (read(cs_sdd, 16) != 0) {
cholletisaik777 0:bcbd76c86cde 197 debug("\rCouldn't read cs_sdd response from disk\n");
cholletisaik777 0:bcbd76c86cde 198 return 0;
cholletisaik777 0:bcbd76c86cde 199 }
cholletisaik777 0:bcbd76c86cde 200
cholletisaik777 0:bcbd76c86cde 201 // cs_sdd_structure : cs_sdd[127:126]
cholletisaik777 0:bcbd76c86cde 202 // c_size : cs_sdd[73:62]
cholletisaik777 0:bcbd76c86cde 203 // c_size_mult : cs_sdd[49:47]
cholletisaik777 0:bcbd76c86cde 204 // read_bl_len : cs_sdd[83:80] - the *maximum* read block length
cholletisaik777 0:bcbd76c86cde 205
cholletisaik777 0:bcbd76c86cde 206 int cs_sdd_structure = ext_bits(cs_sdd, 127, 126);
cholletisaik777 0:bcbd76c86cde 207
cholletisaik777 0:bcbd76c86cde 208 switch (cs_sdd_structure) {
cholletisaik777 0:bcbd76c86cde 209 case 0:
cholletisaik777 0:bcbd76c86cde 210 cdv = 512;
cholletisaik777 0:bcbd76c86cde 211 c_size = ext_bits(cs_sdd, 73, 62);
cholletisaik777 0:bcbd76c86cde 212 c_size_mult = ext_bits(cs_sdd, 49, 47);
cholletisaik777 0:bcbd76c86cde 213 read_bl_len = ext_bits(cs_sdd, 83, 80);
cholletisaik777 0:bcbd76c86cde 214
cholletisaik777 0:bcbd76c86cde 215 block_len = 1 << read_bl_len;
cholletisaik777 0:bcbd76c86cde 216 mult = 1 << (c_size_mult + 2);
cholletisaik777 0:bcbd76c86cde 217 blocknr = (c_size + 1) * mult;
cholletisaik777 0:bcbd76c86cde 218 capacity = blocknr * block_len;
cholletisaik777 0:bcbd76c86cde 219 blocks = capacity / 512;
cholletisaik777 0:bcbd76c86cde 220 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
cholletisaik777 0:bcbd76c86cde 221 break;
cholletisaik777 0:bcbd76c86cde 222
cholletisaik777 0:bcbd76c86cde 223 case 1:
cholletisaik777 0:bcbd76c86cde 224 cdv = 1;
cholletisaik777 0:bcbd76c86cde 225 hc_c_size = ext_bits(cs_sdd, 63, 48);
cholletisaik777 0:bcbd76c86cde 226 blocks = (hc_c_size+1)*1024;
cholletisaik777 0:bcbd76c86cde 227 debug_if(SD_DBG, "\n\rSDHC Card \n\rhc_c_size: %d\n\rcapacity: %lld \n\rsectors: %lld\n\r", hc_c_size, blocks*512, blocks);
cholletisaik777 0:bcbd76c86cde 228 break;
cholletisaik777 0:bcbd76c86cde 229
cholletisaik777 0:bcbd76c86cde 230 default:
cholletisaik777 0:bcbd76c86cde 231 debug("cs_sdD struct unsupported\r\n");
cholletisaik777 0:bcbd76c86cde 232 return 0;
cholletisaik777 0:bcbd76c86cde 233 };
cholletisaik777 0:bcbd76c86cde 234 return blocks;
cholletisaik777 0:bcbd76c86cde 235 }
cholletisaik777 0:bcbd76c86cde 236
cholletisaik777 0:bcbd76c86cde 237 int cmdx(int cmd, int arg)
cholletisaik777 0:bcbd76c86cde 238 {
cholletisaik777 0:bcbd76c86cde 239 cs_sd = 0;
cholletisaik777 0:bcbd76c86cde 240
cholletisaik777 0:bcbd76c86cde 241 // send a command
cholletisaik777 0:bcbd76c86cde 242 spi_sd.write(0x40 | cmd);
cholletisaik777 0:bcbd76c86cde 243 spi_sd.write(arg >> 24);
cholletisaik777 0:bcbd76c86cde 244 spi_sd.write(arg >> 16);
cholletisaik777 0:bcbd76c86cde 245 spi_sd.write(arg >> 8);
cholletisaik777 0:bcbd76c86cde 246 spi_sd.write(arg >> 0);
cholletisaik777 0:bcbd76c86cde 247 spi_sd.write(0x95);
cholletisaik777 0:bcbd76c86cde 248
cholletisaik777 0:bcbd76c86cde 249 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:bcbd76c86cde 250 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:bcbd76c86cde 251 int response = spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 252 if (!(response & 0x80)) {
cholletisaik777 0:bcbd76c86cde 253 return response;
cholletisaik777 0:bcbd76c86cde 254 }
cholletisaik777 0:bcbd76c86cde 255 }
cholletisaik777 0:bcbd76c86cde 256 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 257 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 258 return -1; // timeout
cholletisaik777 0:bcbd76c86cde 259 }
cholletisaik777 0:bcbd76c86cde 260
cholletisaik777 0:bcbd76c86cde 261 static uint32_t ext_bits(unsigned char *data, int msb, int lsb)
cholletisaik777 0:bcbd76c86cde 262 {
cholletisaik777 0:bcbd76c86cde 263 uint32_t bits = 0;
cholletisaik777 0:bcbd76c86cde 264 uint32_t size = 1 + msb - lsb;
cholletisaik777 0:bcbd76c86cde 265 for (int i = 0; i < size; i++) {
cholletisaik777 0:bcbd76c86cde 266 uint32_t position = lsb + i;
cholletisaik777 0:bcbd76c86cde 267 uint32_t byte = 15 - (position >> 3);
cholletisaik777 0:bcbd76c86cde 268 uint32_t bit = position & 0x7;
cholletisaik777 0:bcbd76c86cde 269 uint32_t value = (data[byte] >> bit) & 1;
cholletisaik777 0:bcbd76c86cde 270 bits |= value << i;
cholletisaik777 0:bcbd76c86cde 271 }
cholletisaik777 0:bcbd76c86cde 272 return bits;
cholletisaik777 0:bcbd76c86cde 273 }
cholletisaik777 0:bcbd76c86cde 274
cholletisaik777 0:bcbd76c86cde 275 int disk_initialize()
cholletisaik777 0:bcbd76c86cde 276 {
cholletisaik777 0:bcbd76c86cde 277 int i = initialise_card();
cholletisaik777 0:bcbd76c86cde 278 debug_if(SD_DBG, "init card = %d\n", i);
cholletisaik777 0:bcbd76c86cde 279 sectors = sd_sectors();
cholletisaik777 0:bcbd76c86cde 280
cholletisaik777 0:bcbd76c86cde 281 // Set block length to 512 (CMD16)
cholletisaik777 0:bcbd76c86cde 282 if (cmd(16, 512) != 0) {
cholletisaik777 0:bcbd76c86cde 283 debug("\rSet 512-byte block timed out\r\n");
cholletisaik777 0:bcbd76c86cde 284 return 1;
cholletisaik777 0:bcbd76c86cde 285 } else {
cholletisaik777 0:bcbd76c86cde 286 printf("\rDisk initialization successfull\r\n");
cholletisaik777 0:bcbd76c86cde 287 }
cholletisaik777 0:bcbd76c86cde 288
cholletisaik777 0:bcbd76c86cde 289 spi_sd.frequency(1000000); // Set to 1MHz for data transfer
cholletisaik777 0:bcbd76c86cde 290 return 0;
cholletisaik777 0:bcbd76c86cde 291 }
cholletisaik777 0:bcbd76c86cde 292
cholletisaik777 0:bcbd76c86cde 293 int disk_write(const uint8_t *buffer, uint64_t block_number)
cholletisaik777 0:bcbd76c86cde 294
cholletisaik777 0:bcbd76c86cde 295 {
cholletisaik777 0:bcbd76c86cde 296 // set write address for single block (CMD24)
cholletisaik777 0:bcbd76c86cde 297 if (cmd(24, block_number * cdv) != 0) {
cholletisaik777 0:bcbd76c86cde 298 return 1;
cholletisaik777 0:bcbd76c86cde 299 }
cholletisaik777 0:bcbd76c86cde 300
cholletisaik777 0:bcbd76c86cde 301 // send the data block
cholletisaik777 0:bcbd76c86cde 302 write(buffer, 512);
cholletisaik777 0:bcbd76c86cde 303 //printf("Written Successfully bro \n");
cholletisaik777 0:bcbd76c86cde 304 return 0;
cholletisaik777 0:bcbd76c86cde 305 }
cholletisaik777 0:bcbd76c86cde 306
cholletisaik777 0:bcbd76c86cde 307 int write(const uint8_t*buffer, uint32_t length)
cholletisaik777 0:bcbd76c86cde 308 {
cholletisaik777 0:bcbd76c86cde 309 cs_sd = 0;
cholletisaik777 0:bcbd76c86cde 310
cholletisaik777 0:bcbd76c86cde 311 // indicate start of block
cholletisaik777 0:bcbd76c86cde 312 spi_sd.write(0xFE);
cholletisaik777 0:bcbd76c86cde 313
cholletisaik777 0:bcbd76c86cde 314 // write the data
cholletisaik777 0:bcbd76c86cde 315 for (int i = 0; i < length; i++) {
cholletisaik777 0:bcbd76c86cde 316 spi_sd.write(buffer[i]);
cholletisaik777 0:bcbd76c86cde 317 }
cholletisaik777 0:bcbd76c86cde 318
cholletisaik777 0:bcbd76c86cde 319 // write the checksum
cholletisaik777 0:bcbd76c86cde 320 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 321 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 322
cholletisaik777 0:bcbd76c86cde 323 // check the response token
cholletisaik777 0:bcbd76c86cde 324 if ((spi_sd.write(0xFF) & 0x1F) != 0x05) {
cholletisaik777 0:bcbd76c86cde 325 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 326 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 327 return 1;
cholletisaik777 0:bcbd76c86cde 328 }
cholletisaik777 0:bcbd76c86cde 329
cholletisaik777 0:bcbd76c86cde 330 // wait for write to finish
cholletisaik777 0:bcbd76c86cde 331 while (spi_sd.write(0xFF) == 0);
cholletisaik777 0:bcbd76c86cde 332
cholletisaik777 0:bcbd76c86cde 333 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 334 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 335 return 0;
cholletisaik777 0:bcbd76c86cde 336 }
cholletisaik777 0:bcbd76c86cde 337
cholletisaik777 0:bcbd76c86cde 338 int disk_read(uint8_t *buffer, uint64_t block_number)
cholletisaik777 0:bcbd76c86cde 339 {
cholletisaik777 0:bcbd76c86cde 340 // set read address for single block (CMD17)
cholletisaik777 0:bcbd76c86cde 341 if (cmd(17, block_number * cdv) != 0) {
cholletisaik777 0:bcbd76c86cde 342 return 1;
cholletisaik777 0:bcbd76c86cde 343 }
cholletisaik777 0:bcbd76c86cde 344
cholletisaik777 0:bcbd76c86cde 345 // receive the data
cholletisaik777 0:bcbd76c86cde 346 read(buffer, 512);
cholletisaik777 0:bcbd76c86cde 347 return 0;
cholletisaik777 0:bcbd76c86cde 348 }
cholletisaik777 0:bcbd76c86cde 349
cholletisaik777 0:bcbd76c86cde 350 int read(uint8_t *buffer, uint32_t length)
cholletisaik777 0:bcbd76c86cde 351 {
cholletisaik777 0:bcbd76c86cde 352 cs_sd = 0;
cholletisaik777 0:bcbd76c86cde 353
cholletisaik777 0:bcbd76c86cde 354 // read until start byte (0xFF)
cholletisaik777 0:bcbd76c86cde 355 while (spi_sd.write(0xFF) != 0xFE);
cholletisaik777 0:bcbd76c86cde 356
cholletisaik777 0:bcbd76c86cde 357 // read data
cholletisaik777 0:bcbd76c86cde 358 for (int i = 0; i < length; i++) {
cholletisaik777 0:bcbd76c86cde 359 buffer[i] = spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 360 }
cholletisaik777 0:bcbd76c86cde 361 spi_sd.write(0xFF); // checksum
cholletisaik777 0:bcbd76c86cde 362 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 363
cholletisaik777 0:bcbd76c86cde 364 cs_sd = 1;
cholletisaik777 0:bcbd76c86cde 365 spi_sd.write(0xFF);
cholletisaik777 0:bcbd76c86cde 366 return 0;
cholletisaik777 0:bcbd76c86cde 367 }
cholletisaik777 0:bcbd76c86cde 368
cholletisaik777 0:bcbd76c86cde 369 int disk_erase(int startBlock, int totalBlocks)
cholletisaik777 0:bcbd76c86cde 370 {
cholletisaik777 0:bcbd76c86cde 371 if(cmd(32, startBlock * cdv) != 0) {
cholletisaik777 0:bcbd76c86cde 372 return 1;
cholletisaik777 0:bcbd76c86cde 373 }
cholletisaik777 0:bcbd76c86cde 374 if (cmd(33, (startBlock+totalBlocks-1) * cdv) != 0) {
cholletisaik777 0:bcbd76c86cde 375 return 1;
cholletisaik777 0:bcbd76c86cde 376 }
cholletisaik777 0:bcbd76c86cde 377 if (cmd(38,0) != 0) {
cholletisaik777 0:bcbd76c86cde 378 return 1;
cholletisaik777 0:bcbd76c86cde 379 }
cholletisaik777 0:bcbd76c86cde 380
cholletisaik777 0:bcbd76c86cde 381 return 0; //normal return
cholletisaik777 0:bcbd76c86cde 382 }