saikiran cholleti / Mbed 2 deprecated CDMS_COM_INT

vr1.1

Dependencies:   FreescaleIAP mbed-rtos mbed

Fork of CDMS_RTOS_v1_1 by Team Fox

SDCard.cpp@8:607ae92fa6af, 2015-07-04 (annotated)

Committer:
cholletisaik777
Date:
Sat Jul 04 08:56:34 2015 +0000
Revision:
8:607ae92fa6af
Parent:
7:c270a9e37290
Child:
11:d6dc9074075b
cdms_rtos_v1_0_3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cholletisaik777 8:607ae92fa6af 1 #include "mbed.h"
cholletisaik777 8:607ae92fa6af 2 #include "mbed_debug.h"
cholletisaik777 0:d6e3d1e21484 3 #include "SDCard.h"
cholletisaik777 8:607ae92fa6af 4 #include "all_funcs.h"
cholletisaik777 0:d6e3d1e21484 5
cholletisaik777 0:d6e3d1e21484 6 SPI spi_SD(PTD6, PTD7, PTD5); // mosi, miso, sclk
pradeepvk2208 2:4c79b3dfef31 7 DigitalOut cs_SD(D2);
cholletisaik777 0:d6e3d1e21484 8
cholletisaik777 0:d6e3d1e21484 9 int count_bro;
cholletisaik777 0:d6e3d1e21484 10 int cdv;
cholletisaik777 4:cc85cfaa2086 11 uint64_t sectors;
cholletisaik777 0:d6e3d1e21484 12
cholletisaik777 7:c270a9e37290 13 int *FCTN_INIT_SD()
cholletisaik777 4:cc85cfaa2086 14 {
cholletisaik777 4:cc85cfaa2086 15 int sd_response[2] = {initialise_card(),disk_initialize()};
cholletisaik777 4:cc85cfaa2086 16 return sd_response;
cholletisaik777 4:cc85cfaa2086 17 }
cholletisaik777 4:cc85cfaa2086 18
cholletisaik777 4:cc85cfaa2086 19
cholletisaik777 0:d6e3d1e21484 20 int initialise_card() {
cholletisaik777 0:d6e3d1e21484 21 // Set to 100kHz for initialisation, and clock card with cs_SD = 1
cholletisaik777 0:d6e3d1e21484 22 spi_SD.frequency(100000);
cholletisaik777 0:d6e3d1e21484 23 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 24 for (int i = 0; i < 16; i++) {
cholletisaik777 0:d6e3d1e21484 25 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 26 }
cholletisaik777 0:d6e3d1e21484 27
cholletisaik777 0:d6e3d1e21484 28 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
cholletisaik777 0:d6e3d1e21484 29 if (cmd(0, 0) != R1_IDLE_STATE) {
cholletisaik777 0:d6e3d1e21484 30 debug("No disk, or could not put SD card in to SPI idle state\r\n");
cholletisaik777 0:d6e3d1e21484 31 return SDCARD_FAIL;
cholletisaik777 0:d6e3d1e21484 32 }
cholletisaik777 0:d6e3d1e21484 33
cholletisaik777 0:d6e3d1e21484 34 // send CMD8 to determine whther it is ver 2.x
cholletisaik777 0:d6e3d1e21484 35 int r = cmd8();
cholletisaik777 8:607ae92fa6af 36 if (r == R1_IDLE_STATE)
cholletisaik777 8:607ae92fa6af 37 {
cholletisaik777 0:d6e3d1e21484 38 printf("Entering v2 bro\r\n");
cholletisaik777 0:d6e3d1e21484 39 return initialise_card_v2();
cholletisaik777 0:d6e3d1e21484 40
cholletisaik777 8:607ae92fa6af 41 }
cholletisaik777 8:607ae92fa6af 42 else
cholletisaik777 8:607ae92fa6af 43 {
cholletisaik777 0:d6e3d1e21484 44 debug("Not in idle state after sending CMD8 (not an SD card?)\r\n");
cholletisaik777 0:d6e3d1e21484 45 return SDCARD_FAIL;
cholletisaik777 0:d6e3d1e21484 46 }
cholletisaik777 0:d6e3d1e21484 47 }
cholletisaik777 0:d6e3d1e21484 48
cholletisaik777 0:d6e3d1e21484 49 int initialise_card_v1() {
cholletisaik777 0:d6e3d1e21484 50 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 51 cmd(55, 0);
cholletisaik777 0:d6e3d1e21484 52 if (cmd(41, 0) == 0) {
cholletisaik777 0:d6e3d1e21484 53 printf("Yuppie v1 successful\r\n");
cholletisaik777 0:d6e3d1e21484 54 cdv = 512;
cholletisaik777 0:d6e3d1e21484 55 debug_if(SD_DBG, "\r\n\rInit: SEDCARD_V1\r\n\r");
cholletisaik777 0:d6e3d1e21484 56
cholletisaik777 0:d6e3d1e21484 57 return SDCARD_V1;
cholletisaik777 0:d6e3d1e21484 58 }
cholletisaik777 0:d6e3d1e21484 59 }
cholletisaik777 0:d6e3d1e21484 60
cholletisaik777 0:d6e3d1e21484 61 debug("Timeout waiting for v1.x card\r\n");
cholletisaik777 0:d6e3d1e21484 62 return SDCARD_FAIL;
cholletisaik777 0:d6e3d1e21484 63 }
cholletisaik777 0:d6e3d1e21484 64
cholletisaik777 0:d6e3d1e21484 65
cholletisaik777 0:d6e3d1e21484 66 int initialise_card_v2() {
cholletisaik777 0:d6e3d1e21484 67 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 68 wait_ms(50);
cholletisaik777 0:d6e3d1e21484 69 cmd58();
cholletisaik777 0:d6e3d1e21484 70 cmd(55, 0);
cholletisaik777 0:d6e3d1e21484 71 if (cmd(41, 0x40000000) == 0) {
cholletisaik777 0:d6e3d1e21484 72 printf("Yuppie,v2 successful\r\n");
cholletisaik777 0:d6e3d1e21484 73 cmd58();
cholletisaik777 0:d6e3d1e21484 74 debug_if(SD_DBG, "\r\n\rInit: SDCARD_V2\r\n\r");
cholletisaik777 0:d6e3d1e21484 75 cdv = 1;
cholletisaik777 0:d6e3d1e21484 76
cholletisaik777 0:d6e3d1e21484 77 return SDCARD_V2;
cholletisaik777 0:d6e3d1e21484 78 }
cholletisaik777 0:d6e3d1e21484 79 }
cholletisaik777 0:d6e3d1e21484 80
cholletisaik777 0:d6e3d1e21484 81 debug("Timeout waiting for v2.x card\r\n");
cholletisaik777 0:d6e3d1e21484 82 return SDCARD_FAIL;
cholletisaik777 0:d6e3d1e21484 83 }
cholletisaik777 0:d6e3d1e21484 84
cholletisaik777 0:d6e3d1e21484 85 int cmd(int cmd, int arg) {
cholletisaik777 0:d6e3d1e21484 86 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 87
cholletisaik777 0:d6e3d1e21484 88 // send a command
cholletisaik777 0:d6e3d1e21484 89 spi_SD.write(0x40 | cmd);
cholletisaik777 0:d6e3d1e21484 90 spi_SD.write(arg >> 24);
cholletisaik777 0:d6e3d1e21484 91 spi_SD.write(arg >> 16);
cholletisaik777 0:d6e3d1e21484 92 spi_SD.write(arg >> 8);
cholletisaik777 0:d6e3d1e21484 93 spi_SD.write(arg >> 0);
cholletisaik777 0:d6e3d1e21484 94 spi_SD.write(0x95);
cholletisaik777 0:d6e3d1e21484 95
cholletisaik777 0:d6e3d1e21484 96 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 97 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 98 int response = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 99 if (!(response & 0x80)) {
cholletisaik777 0:d6e3d1e21484 100 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 101 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 102 return response;
cholletisaik777 0:d6e3d1e21484 103 }
cholletisaik777 0:d6e3d1e21484 104 }
cholletisaik777 0:d6e3d1e21484 105 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 106 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 107 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 108 }
cholletisaik777 0:d6e3d1e21484 109
cholletisaik777 0:d6e3d1e21484 110
cholletisaik777 0:d6e3d1e21484 111 int cmd58() {
cholletisaik777 0:d6e3d1e21484 112 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 113 int arg = 0;
cholletisaik777 0:d6e3d1e21484 114
cholletisaik777 0:d6e3d1e21484 115 // send a command
cholletisaik777 0:d6e3d1e21484 116 spi_SD.write(0x40 | 58);
cholletisaik777 0:d6e3d1e21484 117 spi_SD.write(arg >> 24);
cholletisaik777 0:d6e3d1e21484 118 spi_SD.write(arg >> 16);
cholletisaik777 0:d6e3d1e21484 119 spi_SD.write(arg >> 8);
cholletisaik777 0:d6e3d1e21484 120 spi_SD.write(arg >> 0);
cholletisaik777 0:d6e3d1e21484 121 spi_SD.write(0x95);
cholletisaik777 0:d6e3d1e21484 122
cholletisaik777 0:d6e3d1e21484 123 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 124 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 125 int response = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 126 if (!(response & 0x80)) {
cholletisaik777 0:d6e3d1e21484 127 int ocr = spi_SD.write(0xFF) << 24;
cholletisaik777 0:d6e3d1e21484 128 ocr |= spi_SD.write(0xFF) << 16;
cholletisaik777 0:d6e3d1e21484 129 ocr |= spi_SD.write(0xFF) << 8;
cholletisaik777 0:d6e3d1e21484 130 ocr |= spi_SD.write(0xFF) << 0;
cholletisaik777 0:d6e3d1e21484 131 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 132 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 133 return response;
cholletisaik777 0:d6e3d1e21484 134 }
cholletisaik777 0:d6e3d1e21484 135 }
cholletisaik777 0:d6e3d1e21484 136 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 137 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 138 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 139 }
cholletisaik777 0:d6e3d1e21484 140
cholletisaik777 0:d6e3d1e21484 141
cholletisaik777 0:d6e3d1e21484 142 int cmd8() {
cholletisaik777 0:d6e3d1e21484 143 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 144
cholletisaik777 0:d6e3d1e21484 145 // send a command
cholletisaik777 0:d6e3d1e21484 146 spi_SD.write(0x40 | 8); // CMD8
cholletisaik777 0:d6e3d1e21484 147 spi_SD.write(0x00); // reserved
cholletisaik777 0:d6e3d1e21484 148 spi_SD.write(0x00); // reserved
cholletisaik777 0:d6e3d1e21484 149 spi_SD.write(0x01); // 3.3v
cholletisaik777 0:d6e3d1e21484 150 spi_SD.write(0xAA); // check pattern
cholletisaik777 0:d6e3d1e21484 151 spi_SD.write(0x87); // crc
cholletisaik777 0:d6e3d1e21484 152
cholletisaik777 0:d6e3d1e21484 153 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 154 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
cholletisaik777 0:d6e3d1e21484 155 char response[5];
cholletisaik777 0:d6e3d1e21484 156 response[0] = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 157 if (!(response[0] & 0x80)) {
cholletisaik777 0:d6e3d1e21484 158 for (int j = 1; j < 5; j++) {
cholletisaik777 0:d6e3d1e21484 159 response[i] = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 160 }
cholletisaik777 0:d6e3d1e21484 161 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 162 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 163 return response[0];
cholletisaik777 0:d6e3d1e21484 164 }
cholletisaik777 0:d6e3d1e21484 165 }
cholletisaik777 0:d6e3d1e21484 166 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 167 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 168 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 169 }
cholletisaik777 0:d6e3d1e21484 170
cholletisaik777 0:d6e3d1e21484 171 uint64_t sd_sectors() {
cholletisaik777 0:d6e3d1e21484 172 uint32_t c_size, c_size_mult, read_bl_len;
cholletisaik777 0:d6e3d1e21484 173 uint32_t block_len, mult, blocknr, capacity;
cholletisaik777 0:d6e3d1e21484 174 uint32_t hc_c_size;
cholletisaik777 0:d6e3d1e21484 175 uint64_t blocks;
cholletisaik777 0:d6e3d1e21484 176
cholletisaik777 0:d6e3d1e21484 177 // CMD9, Response R2 (R1 byte + 16-byte block read)
cholletisaik777 0:d6e3d1e21484 178 if (cmdx(9, 0) != 0) {
cholletisaik777 0:d6e3d1e21484 179 debug("Didn't get a response from the disk\r\n");
cholletisaik777 0:d6e3d1e21484 180 return 0;
cholletisaik777 0:d6e3d1e21484 181 }
cholletisaik777 0:d6e3d1e21484 182
cholletisaik777 0:d6e3d1e21484 183 uint8_t csd[16];
cholletisaik777 0:d6e3d1e21484 184 if (read(csd, 16) != 0) {
cholletisaik777 0:d6e3d1e21484 185 debug("Couldn't read csd response from disk\r\n");
cholletisaik777 0:d6e3d1e21484 186 return 0;
cholletisaik777 0:d6e3d1e21484 187 }
cholletisaik777 0:d6e3d1e21484 188
cholletisaik777 0:d6e3d1e21484 189 // csd_structure : csd[127:126]
cholletisaik777 0:d6e3d1e21484 190 // c_size : csd[73:62]
cholletisaik777 0:d6e3d1e21484 191 // c_size_mult : csd[49:47]
cholletisaik777 0:d6e3d1e21484 192 // read_bl_len : csd[83:80] - the *maximum* read block length
cholletisaik777 0:d6e3d1e21484 193
cholletisaik777 0:d6e3d1e21484 194 int csd_structure = ext_bits(csd, 127, 126);
cholletisaik777 0:d6e3d1e21484 195
cholletisaik777 0:d6e3d1e21484 196 switch (csd_structure) {
cholletisaik777 0:d6e3d1e21484 197 case 0:
cholletisaik777 0:d6e3d1e21484 198 cdv = 512;
cholletisaik777 0:d6e3d1e21484 199 c_size = ext_bits(csd, 73, 62);
cholletisaik777 0:d6e3d1e21484 200 c_size_mult = ext_bits(csd, 49, 47);
cholletisaik777 0:d6e3d1e21484 201 read_bl_len = ext_bits(csd, 83, 80);
cholletisaik777 0:d6e3d1e21484 202
cholletisaik777 0:d6e3d1e21484 203 block_len = 1 << read_bl_len;
cholletisaik777 0:d6e3d1e21484 204 mult = 1 << (c_size_mult + 2);
cholletisaik777 0:d6e3d1e21484 205 blocknr = (c_size + 1) * mult;
cholletisaik777 0:d6e3d1e21484 206 capacity = blocknr * block_len;
cholletisaik777 0:d6e3d1e21484 207 blocks = capacity / 512;
cholletisaik777 0:d6e3d1e21484 208 debug_if(SD_DBG, "\r\n\rSDCard\r\n\rc_size: %d \r\n\rcapacity: %ld \r\n\rsectors: %lld\r\n\r", c_size, capacity, blocks);
cholletisaik777 0:d6e3d1e21484 209 break;
cholletisaik777 0:d6e3d1e21484 210
cholletisaik777 0:d6e3d1e21484 211 case 1:
cholletisaik777 0:d6e3d1e21484 212 cdv = 1;
cholletisaik777 0:d6e3d1e21484 213 hc_c_size = ext_bits(csd, 63, 48);
cholletisaik777 0:d6e3d1e21484 214 blocks = (hc_c_size+1)*1024;
cholletisaik777 0:d6e3d1e21484 215 debug_if(SD_DBG, "\r\n\rSDHC Card \r\n\rhc_c_size: %d\r\n\rcapacity: %lld \r\n\rsectors: %lld\r\n\r", hc_c_size, blocks*512, blocks);
cholletisaik777 0:d6e3d1e21484 216 break;
cholletisaik777 0:d6e3d1e21484 217
cholletisaik777 0:d6e3d1e21484 218 default:
cholletisaik777 0:d6e3d1e21484 219 debug("CSD struct unsupported\r\r\n");
cholletisaik777 0:d6e3d1e21484 220 return 0;
cholletisaik777 0:d6e3d1e21484 221 };
cholletisaik777 0:d6e3d1e21484 222 return blocks;
cholletisaik777 0:d6e3d1e21484 223 }
cholletisaik777 0:d6e3d1e21484 224
cholletisaik777 0:d6e3d1e21484 225 int cmdx(int cmd, int arg) {
cholletisaik777 0:d6e3d1e21484 226 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 227
cholletisaik777 0:d6e3d1e21484 228 // send a command
cholletisaik777 0:d6e3d1e21484 229 spi_SD.write(0x40 | cmd);
cholletisaik777 0:d6e3d1e21484 230 spi_SD.write(arg >> 24);
cholletisaik777 0:d6e3d1e21484 231 spi_SD.write(arg >> 16);
cholletisaik777 0:d6e3d1e21484 232 spi_SD.write(arg >> 8);
cholletisaik777 0:d6e3d1e21484 233 spi_SD.write(arg >> 0);
cholletisaik777 0:d6e3d1e21484 234 spi_SD.write(0x95);
cholletisaik777 0:d6e3d1e21484 235
cholletisaik777 0:d6e3d1e21484 236 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 237 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 238 int response = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 239 if (!(response & 0x80)) {
cholletisaik777 0:d6e3d1e21484 240 return response;
cholletisaik777 0:d6e3d1e21484 241 }
cholletisaik777 0:d6e3d1e21484 242 }
cholletisaik777 0:d6e3d1e21484 243 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 244 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 245 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 246 }
cholletisaik777 0:d6e3d1e21484 247
cholletisaik777 0:d6e3d1e21484 248
cholletisaik777 0:d6e3d1e21484 249 int read(uint8_t *buffer, uint32_t length) {
cholletisaik777 0:d6e3d1e21484 250 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 251
cholletisaik777 0:d6e3d1e21484 252 // read until start byte (0xFF)
cholletisaik777 0:d6e3d1e21484 253 while (spi_SD.write(0xFF) != 0xFE);
cholletisaik777 0:d6e3d1e21484 254
cholletisaik777 0:d6e3d1e21484 255 // read data
cholletisaik777 0:d6e3d1e21484 256 for (int i = 0; i < length; i++) {
cholletisaik777 0:d6e3d1e21484 257 buffer[i] = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 258 }
cholletisaik777 0:d6e3d1e21484 259 spi_SD.write(0xFF); // checksum
cholletisaik777 0:d6e3d1e21484 260 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 261
cholletisaik777 0:d6e3d1e21484 262 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 263 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 264 return 0;
cholletisaik777 0:d6e3d1e21484 265 }
cholletisaik777 0:d6e3d1e21484 266
cholletisaik777 0:d6e3d1e21484 267 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
cholletisaik777 0:d6e3d1e21484 268 uint32_t bits = 0;
cholletisaik777 0:d6e3d1e21484 269 uint32_t size = 1 + msb - lsb;
cholletisaik777 0:d6e3d1e21484 270 for (int i = 0; i < size; i++) {
cholletisaik777 0:d6e3d1e21484 271 uint32_t position = lsb + i;
cholletisaik777 0:d6e3d1e21484 272 uint32_t byte = 15 - (position >> 3);
cholletisaik777 0:d6e3d1e21484 273 uint32_t bit = position & 0x7;
cholletisaik777 0:d6e3d1e21484 274 uint32_t value = (data[byte] >> bit) & 1;
cholletisaik777 0:d6e3d1e21484 275 bits |= value << i;
cholletisaik777 0:d6e3d1e21484 276 }
cholletisaik777 0:d6e3d1e21484 277 return bits;
cholletisaik777 0:d6e3d1e21484 278 }
cholletisaik777 0:d6e3d1e21484 279
cholletisaik777 0:d6e3d1e21484 280 int disk_initialize() {
cholletisaik777 0:d6e3d1e21484 281 int i = initialise_card();
cholletisaik777 0:d6e3d1e21484 282 debug_if(SD_DBG, "init card = %d\r\n", i);
cholletisaik777 0:d6e3d1e21484 283 sectors = sd_sectors();
cholletisaik777 0:d6e3d1e21484 284
cholletisaik777 0:d6e3d1e21484 285 // Set block length to 512 (CMD16)
cholletisaik777 0:d6e3d1e21484 286 if (cmd(16, 512) != 0) {
cholletisaik777 0:d6e3d1e21484 287 debug("Set 512-byte block timed out\r\n");
cholletisaik777 0:d6e3d1e21484 288 return 1;
cholletisaik777 0:d6e3d1e21484 289 }
cholletisaik777 0:d6e3d1e21484 290 else
cholletisaik777 0:d6e3d1e21484 291 {
cholletisaik777 0:d6e3d1e21484 292 printf("Hey,block init succesful\r\n");
cholletisaik777 0:d6e3d1e21484 293 }
cholletisaik777 0:d6e3d1e21484 294
cholletisaik777 0:d6e3d1e21484 295 spi_SD.frequency(1000000); // Set to 1MHz for data transfer
cholletisaik777 0:d6e3d1e21484 296 return 0;
cholletisaik777 0:d6e3d1e21484 297 }
cholletisaik777 0:d6e3d1e21484 298
cholletisaik777 7:c270a9e37290 299 int FCTN_WR_SD(const uint8_t *buffer, uint64_t block_number)
cholletisaik777 0:d6e3d1e21484 300
cholletisaik777 0:d6e3d1e21484 301 {
cholletisaik777 0:d6e3d1e21484 302 // set write address for single block (CMD24)
cholletisaik777 0:d6e3d1e21484 303 if (cmd(24, block_number * cdv) != 0) {
cholletisaik777 0:d6e3d1e21484 304 return 1;
cholletisaik777 0:d6e3d1e21484 305 }
cholletisaik777 0:d6e3d1e21484 306
cholletisaik777 0:d6e3d1e21484 307 // send the data block
cholletisaik777 0:d6e3d1e21484 308 write(buffer, 512);
cholletisaik777 0:d6e3d1e21484 309 printf("Written Successfully bro \r\n");
cholletisaik777 0:d6e3d1e21484 310 return 0;
cholletisaik777 0:d6e3d1e21484 311 }
cholletisaik777 0:d6e3d1e21484 312
cholletisaik777 0:d6e3d1e21484 313 int write(const uint8_t*buffer, uint32_t length) {
cholletisaik777 0:d6e3d1e21484 314 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 315
cholletisaik777 0:d6e3d1e21484 316 // indicate start of block
cholletisaik777 0:d6e3d1e21484 317 spi_SD.write(0xFE);
cholletisaik777 0:d6e3d1e21484 318
cholletisaik777 0:d6e3d1e21484 319 // write the data
cholletisaik777 0:d6e3d1e21484 320 for (int i = 0; i < length; i++) {
cholletisaik777 0:d6e3d1e21484 321 spi_SD.write(buffer[i]);
cholletisaik777 0:d6e3d1e21484 322 }
cholletisaik777 0:d6e3d1e21484 323
cholletisaik777 0:d6e3d1e21484 324 // write the checksum
cholletisaik777 0:d6e3d1e21484 325 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 326 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 327
cholletisaik777 0:d6e3d1e21484 328 // check the response token
cholletisaik777 0:d6e3d1e21484 329 if ((spi_SD.write(0xFF) & 0x1F) != 0x05) {
cholletisaik777 0:d6e3d1e21484 330 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 331 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 332 return 1;
cholletisaik777 0:d6e3d1e21484 333 }
cholletisaik777 0:d6e3d1e21484 334
cholletisaik777 0:d6e3d1e21484 335 // wait for write to finish
cholletisaik777 0:d6e3d1e21484 336 while (spi_SD.write(0xFF) == 0);
cholletisaik777 0:d6e3d1e21484 337
cholletisaik777 0:d6e3d1e21484 338 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 339 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 340 return 0;
cholletisaik777 0:d6e3d1e21484 341 }
cholletisaik777 0:d6e3d1e21484 342
cholletisaik777 7:c270a9e37290 343 int FCTN_RD_SD(uint8_t *buffer, uint64_t block_number) {
cholletisaik777 0:d6e3d1e21484 344 // set read address for single block (CMD17)
cholletisaik777 0:d6e3d1e21484 345 if (cmd(17, block_number * cdv) != 0) {
cholletisaik777 0:d6e3d1e21484 346 return 1;
cholletisaik777 0:d6e3d1e21484 347 }
cholletisaik777 0:d6e3d1e21484 348
cholletisaik777 0:d6e3d1e21484 349 // receive the data
cholletisaik777 0:d6e3d1e21484 350 read(buffer, 512);
cholletisaik777 0:d6e3d1e21484 351 return 0;
cholletisaik777 0:d6e3d1e21484 352 }