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@12:cb3ee1ac3638, 2015-07-06 (annotated)

Committer:
cholletisaik777
Date:
Mon Jul 06 10:31:29 2015 +0000
Revision:
12:cb3ee1ac3638
Parent:
11:d6dc9074075b
Child:
15:2c8629da6ec9
integrated code

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 12:cb3ee1ac3638 5 #include "Flags.h"
cholletisaik777 0:d6e3d1e21484 6
cholletisaik777 0:d6e3d1e21484 7 SPI spi_SD(PTD6, PTD7, PTD5); // mosi, miso, sclk
pradeepvk2208 2:4c79b3dfef31 8 DigitalOut cs_SD(D2);
cholletisaik777 0:d6e3d1e21484 9
cholletisaik777 12:cb3ee1ac3638 10 void FCTN_INIT_SD()
cholletisaik777 4:cc85cfaa2086 11 {
cholletisaik777 12:cb3ee1ac3638 12 uint8_t sd_init_fail_count = 0;
cholletisaik777 12:cb3ee1ac3638 13 uint8_t sd_disk_init_fail_count = 0;
cholletisaik777 11:d6dc9074075b 14 all_flags = all_flags|SDCARD_INIT_STATUS;
cholletisaik777 12:cb3ee1ac3638 15 int sd_response = initialise_card();
cholletisaik777 12:cb3ee1ac3638 16 while(sd_response == 1)
cholletisaik777 12:cb3ee1ac3638 17 {
cholletisaik777 12:cb3ee1ac3638 18 sd_init_fail_count++;
cholletisaik777 12:cb3ee1ac3638 19 sd_response = initialise_card();
cholletisaik777 12:cb3ee1ac3638 20 if(sd_init_fail_count>3)
cholletisaik777 12:cb3ee1ac3638 21 {
cholletisaik777 12:cb3ee1ac3638 22 all_flags = all_flags|SDCARD_INIT_FAIL;
cholletisaik777 12:cb3ee1ac3638 23 printf("\rSDCard init failed\r\n");
cholletisaik777 12:cb3ee1ac3638 24 break;
cholletisaik777 12:cb3ee1ac3638 25 }
cholletisaik777 12:cb3ee1ac3638 26 }
cholletisaik777 12:cb3ee1ac3638 27 sd_response = disk_initialize();
cholletisaik777 12:cb3ee1ac3638 28 while(sd_response == 1)
cholletisaik777 12:cb3ee1ac3638 29 {
cholletisaik777 12:cb3ee1ac3638 30 sd_disk_init_fail_count++;
cholletisaik777 12:cb3ee1ac3638 31 sd_response = disk_initialize();
cholletisaik777 12:cb3ee1ac3638 32 if(sd_disk_init_fail_count>3)
cholletisaik777 12:cb3ee1ac3638 33 {
cholletisaik777 12:cb3ee1ac3638 34 all_flags = all_flags|SDCARD_DISK_FAIL;
cholletisaik777 12:cb3ee1ac3638 35 printf("\rSDCard disk init failed\r\n");
cholletisaik777 12:cb3ee1ac3638 36 break;
cholletisaik777 12:cb3ee1ac3638 37 }
cholletisaik777 12:cb3ee1ac3638 38 }
cholletisaik777 12:cb3ee1ac3638 39 if(sd_disk_init_fail_count<=3 && sd_init_fail_count<=3 )
cholletisaik777 12:cb3ee1ac3638 40 {
cholletisaik777 12:cb3ee1ac3638 41 printf("\rSDCard successfully initialized\r\n");
cholletisaik777 12:cb3ee1ac3638 42 }
cholletisaik777 12:cb3ee1ac3638 43 all_flags = all_flags&(~SDCARD_INIT_STATUS);
cholletisaik777 4:cc85cfaa2086 44 }
cholletisaik777 4:cc85cfaa2086 45
cholletisaik777 12:cb3ee1ac3638 46 int FCTN_RD_SD(uint8_t *buffer, uint64_t block_number)
cholletisaik777 12:cb3ee1ac3638 47 {
cholletisaik777 12:cb3ee1ac3638 48 all_flags = all_flags|SD_RD_STATUS;
cholletisaik777 11:d6dc9074075b 49 // set read address for single block (CMD17)
cholletisaik777 12:cb3ee1ac3638 50 if (cmd(17, block_number * cdv) != 0)
cholletisaik777 12:cb3ee1ac3638 51 {
cholletisaik777 12:cb3ee1ac3638 52 all_flags = all_flags|SD_RD_FAIL;
cholletisaik777 12:cb3ee1ac3638 53 printf("\rReading from SDCard failed\r\n");
cholletisaik777 11:d6dc9074075b 54 return 1;
cholletisaik777 11:d6dc9074075b 55 }
cholletisaik777 11:d6dc9074075b 56 // receive the data
cholletisaik777 11:d6dc9074075b 57 read(buffer, 512);
cholletisaik777 12:cb3ee1ac3638 58 all_flags = all_flags&(~SD_RD_STATUS);
cholletisaik777 12:cb3ee1ac3638 59 printf("Read Successfully from SDCard\r\n");
cholletisaik777 11:d6dc9074075b 60 return 0;
cholletisaik777 11:d6dc9074075b 61 }
cholletisaik777 11:d6dc9074075b 62
cholletisaik777 11:d6dc9074075b 63 int FCTN_WR_SD(const uint8_t *buffer, uint64_t block_number)
cholletisaik777 11:d6dc9074075b 64 {
cholletisaik777 12:cb3ee1ac3638 65 all_flags = all_flags|SD_WR_STATUS;
cholletisaik777 11:d6dc9074075b 66 // set write address for single block (CMD24)
cholletisaik777 12:cb3ee1ac3638 67 if (cmd(24, block_number * cdv) != 0)
cholletisaik777 12:cb3ee1ac3638 68 {
cholletisaik777 12:cb3ee1ac3638 69 all_flags = all_flags|SD_WR_FAIL;
cholletisaik777 12:cb3ee1ac3638 70 printf("\rWriting to SDCard Failed\r\n");
cholletisaik777 11:d6dc9074075b 71 return 1;
cholletisaik777 11:d6dc9074075b 72 }
cholletisaik777 11:d6dc9074075b 73
cholletisaik777 11:d6dc9074075b 74 // send the data block
cholletisaik777 11:d6dc9074075b 75 write(buffer, 512);
cholletisaik777 12:cb3ee1ac3638 76 all_flags = all_flags&(~SD_WR_STATUS);
cholletisaik777 11:d6dc9074075b 77 printf("Written Successfully to SDCard\r\n");
cholletisaik777 11:d6dc9074075b 78 return 0;
cholletisaik777 11:d6dc9074075b 79 }
cholletisaik777 11:d6dc9074075b 80
cholletisaik777 4:cc85cfaa2086 81
cholletisaik777 0:d6e3d1e21484 82 int initialise_card() {
cholletisaik777 0:d6e3d1e21484 83 // Set to 100kHz for initialisation, and clock card with cs_SD = 1
cholletisaik777 0:d6e3d1e21484 84 spi_SD.frequency(100000);
cholletisaik777 0:d6e3d1e21484 85 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 86 for (int i = 0; i < 16; i++) {
cholletisaik777 0:d6e3d1e21484 87 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 88 }
cholletisaik777 0:d6e3d1e21484 89
cholletisaik777 0:d6e3d1e21484 90 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
cholletisaik777 0:d6e3d1e21484 91 if (cmd(0, 0) != R1_IDLE_STATE) {
cholletisaik777 0:d6e3d1e21484 92 debug("No disk, or could not put SD card in to SPI idle state\r\n");
cholletisaik777 12:cb3ee1ac3638 93 return 1;
cholletisaik777 0:d6e3d1e21484 94 }
cholletisaik777 0:d6e3d1e21484 95
cholletisaik777 0:d6e3d1e21484 96 // send CMD8 to determine whther it is ver 2.x
cholletisaik777 0:d6e3d1e21484 97 int r = cmd8();
cholletisaik777 8:607ae92fa6af 98 if (r == R1_IDLE_STATE)
cholletisaik777 8:607ae92fa6af 99 {
cholletisaik777 12:cb3ee1ac3638 100 printf("Entering version2\r\n");
cholletisaik777 11:d6dc9074075b 101 return initialise_card_v2();
cholletisaik777 8:607ae92fa6af 102 }
cholletisaik777 8:607ae92fa6af 103 else
cholletisaik777 8:607ae92fa6af 104 {
cholletisaik777 0:d6e3d1e21484 105 debug("Not in idle state after sending CMD8 (not an SD card?)\r\n");
cholletisaik777 12:cb3ee1ac3638 106 return 1;
cholletisaik777 0:d6e3d1e21484 107 }
cholletisaik777 0:d6e3d1e21484 108 }
cholletisaik777 0:d6e3d1e21484 109
cholletisaik777 0:d6e3d1e21484 110 int initialise_card_v2() {
cholletisaik777 0:d6e3d1e21484 111 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 112 wait_ms(50);
cholletisaik777 0:d6e3d1e21484 113 cmd58();
cholletisaik777 0:d6e3d1e21484 114 cmd(55, 0);
cholletisaik777 0:d6e3d1e21484 115 if (cmd(41, 0x40000000) == 0) {
cholletisaik777 0:d6e3d1e21484 116 printf("Yuppie,v2 successful\r\n");
cholletisaik777 0:d6e3d1e21484 117 cmd58();
cholletisaik777 0:d6e3d1e21484 118 debug_if(SD_DBG, "\r\n\rInit: SDCARD_V2\r\n\r");
cholletisaik777 0:d6e3d1e21484 119 cdv = 1;
cholletisaik777 0:d6e3d1e21484 120
cholletisaik777 12:cb3ee1ac3638 121 return 0;
cholletisaik777 0:d6e3d1e21484 122 }
cholletisaik777 0:d6e3d1e21484 123 }
cholletisaik777 0:d6e3d1e21484 124
cholletisaik777 0:d6e3d1e21484 125 debug("Timeout waiting for v2.x card\r\n");
cholletisaik777 12:cb3ee1ac3638 126 return 1;
cholletisaik777 0:d6e3d1e21484 127 }
cholletisaik777 11:d6dc9074075b 128
cholletisaik777 11:d6dc9074075b 129 int disk_initialize() {
cholletisaik777 11:d6dc9074075b 130 int i = initialise_card();
cholletisaik777 11:d6dc9074075b 131 debug_if(SD_DBG, "init card = %d\r\n", i);
cholletisaik777 11:d6dc9074075b 132 sectors = sd_sectors();
cholletisaik777 11:d6dc9074075b 133
cholletisaik777 11:d6dc9074075b 134 // Set block length to 512 (CMD16)
cholletisaik777 11:d6dc9074075b 135 if (cmd(16, 512) != 0) {
cholletisaik777 11:d6dc9074075b 136 debug("Set 512-byte block timed out\r\n");
cholletisaik777 11:d6dc9074075b 137 return 1;
cholletisaik777 11:d6dc9074075b 138 }
cholletisaik777 11:d6dc9074075b 139 else
cholletisaik777 11:d6dc9074075b 140 {
cholletisaik777 11:d6dc9074075b 141 printf("Hey,block init succesful\r\n");
cholletisaik777 11:d6dc9074075b 142 }
cholletisaik777 11:d6dc9074075b 143
cholletisaik777 11:d6dc9074075b 144 spi_SD.frequency(1000000); // Set to 1MHz for data transfer
cholletisaik777 11:d6dc9074075b 145 return 0;
cholletisaik777 11:d6dc9074075b 146 }
cholletisaik777 0:d6e3d1e21484 147
cholletisaik777 0:d6e3d1e21484 148 int cmd(int cmd, int arg) {
cholletisaik777 0:d6e3d1e21484 149 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 150
cholletisaik777 0:d6e3d1e21484 151 // send a command
cholletisaik777 0:d6e3d1e21484 152 spi_SD.write(0x40 | cmd);
cholletisaik777 0:d6e3d1e21484 153 spi_SD.write(arg >> 24);
cholletisaik777 0:d6e3d1e21484 154 spi_SD.write(arg >> 16);
cholletisaik777 0:d6e3d1e21484 155 spi_SD.write(arg >> 8);
cholletisaik777 0:d6e3d1e21484 156 spi_SD.write(arg >> 0);
cholletisaik777 0:d6e3d1e21484 157 spi_SD.write(0x95);
cholletisaik777 0:d6e3d1e21484 158
cholletisaik777 0:d6e3d1e21484 159 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 160 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 161 int response = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 162 if (!(response & 0x80)) {
cholletisaik777 0:d6e3d1e21484 163 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 164 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 165 return response;
cholletisaik777 0:d6e3d1e21484 166 }
cholletisaik777 0:d6e3d1e21484 167 }
cholletisaik777 0:d6e3d1e21484 168 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 169 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 170 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 171 }
cholletisaik777 0:d6e3d1e21484 172
cholletisaik777 0:d6e3d1e21484 173
cholletisaik777 0:d6e3d1e21484 174 int cmd58() {
cholletisaik777 0:d6e3d1e21484 175 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 176 int arg = 0;
cholletisaik777 0:d6e3d1e21484 177
cholletisaik777 0:d6e3d1e21484 178 // send a command
cholletisaik777 0:d6e3d1e21484 179 spi_SD.write(0x40 | 58);
cholletisaik777 0:d6e3d1e21484 180 spi_SD.write(arg >> 24);
cholletisaik777 0:d6e3d1e21484 181 spi_SD.write(arg >> 16);
cholletisaik777 0:d6e3d1e21484 182 spi_SD.write(arg >> 8);
cholletisaik777 0:d6e3d1e21484 183 spi_SD.write(arg >> 0);
cholletisaik777 0:d6e3d1e21484 184 spi_SD.write(0x95);
cholletisaik777 0:d6e3d1e21484 185
cholletisaik777 0:d6e3d1e21484 186 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 187 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 188 int response = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 189 if (!(response & 0x80)) {
cholletisaik777 0:d6e3d1e21484 190 int ocr = spi_SD.write(0xFF) << 24;
cholletisaik777 0:d6e3d1e21484 191 ocr |= spi_SD.write(0xFF) << 16;
cholletisaik777 0:d6e3d1e21484 192 ocr |= spi_SD.write(0xFF) << 8;
cholletisaik777 0:d6e3d1e21484 193 ocr |= spi_SD.write(0xFF) << 0;
cholletisaik777 0:d6e3d1e21484 194 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 195 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 196 return response;
cholletisaik777 0:d6e3d1e21484 197 }
cholletisaik777 0:d6e3d1e21484 198 }
cholletisaik777 0:d6e3d1e21484 199 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 200 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 201 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 202 }
cholletisaik777 0:d6e3d1e21484 203
cholletisaik777 0:d6e3d1e21484 204
cholletisaik777 0:d6e3d1e21484 205 int cmd8() {
cholletisaik777 0:d6e3d1e21484 206 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 207
cholletisaik777 0:d6e3d1e21484 208 // send a command
cholletisaik777 0:d6e3d1e21484 209 spi_SD.write(0x40 | 8); // CMD8
cholletisaik777 0:d6e3d1e21484 210 spi_SD.write(0x00); // reserved
cholletisaik777 0:d6e3d1e21484 211 spi_SD.write(0x00); // reserved
cholletisaik777 0:d6e3d1e21484 212 spi_SD.write(0x01); // 3.3v
cholletisaik777 0:d6e3d1e21484 213 spi_SD.write(0xAA); // check pattern
cholletisaik777 0:d6e3d1e21484 214 spi_SD.write(0x87); // crc
cholletisaik777 0:d6e3d1e21484 215
cholletisaik777 0:d6e3d1e21484 216 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 217 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
cholletisaik777 0:d6e3d1e21484 218 char response[5];
cholletisaik777 0:d6e3d1e21484 219 response[0] = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 220 if (!(response[0] & 0x80)) {
cholletisaik777 0:d6e3d1e21484 221 for (int j = 1; j < 5; j++) {
cholletisaik777 0:d6e3d1e21484 222 response[i] = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 223 }
cholletisaik777 0:d6e3d1e21484 224 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 225 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 226 return response[0];
cholletisaik777 0:d6e3d1e21484 227 }
cholletisaik777 0:d6e3d1e21484 228 }
cholletisaik777 0:d6e3d1e21484 229 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 230 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 231 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 232 }
cholletisaik777 0:d6e3d1e21484 233
cholletisaik777 0:d6e3d1e21484 234 uint64_t sd_sectors() {
cholletisaik777 0:d6e3d1e21484 235 uint32_t c_size, c_size_mult, read_bl_len;
cholletisaik777 0:d6e3d1e21484 236 uint32_t block_len, mult, blocknr, capacity;
cholletisaik777 0:d6e3d1e21484 237 uint32_t hc_c_size;
cholletisaik777 0:d6e3d1e21484 238 uint64_t blocks;
cholletisaik777 0:d6e3d1e21484 239
cholletisaik777 0:d6e3d1e21484 240 // CMD9, Response R2 (R1 byte + 16-byte block read)
cholletisaik777 0:d6e3d1e21484 241 if (cmdx(9, 0) != 0) {
cholletisaik777 0:d6e3d1e21484 242 debug("Didn't get a response from the disk\r\n");
cholletisaik777 0:d6e3d1e21484 243 return 0;
cholletisaik777 0:d6e3d1e21484 244 }
cholletisaik777 0:d6e3d1e21484 245
cholletisaik777 0:d6e3d1e21484 246 uint8_t csd[16];
cholletisaik777 0:d6e3d1e21484 247 if (read(csd, 16) != 0) {
cholletisaik777 0:d6e3d1e21484 248 debug("Couldn't read csd response from disk\r\n");
cholletisaik777 0:d6e3d1e21484 249 return 0;
cholletisaik777 0:d6e3d1e21484 250 }
cholletisaik777 0:d6e3d1e21484 251
cholletisaik777 0:d6e3d1e21484 252 // csd_structure : csd[127:126]
cholletisaik777 0:d6e3d1e21484 253 // c_size : csd[73:62]
cholletisaik777 0:d6e3d1e21484 254 // c_size_mult : csd[49:47]
cholletisaik777 0:d6e3d1e21484 255 // read_bl_len : csd[83:80] - the *maximum* read block length
cholletisaik777 0:d6e3d1e21484 256
cholletisaik777 0:d6e3d1e21484 257 int csd_structure = ext_bits(csd, 127, 126);
cholletisaik777 0:d6e3d1e21484 258
cholletisaik777 0:d6e3d1e21484 259 switch (csd_structure) {
cholletisaik777 0:d6e3d1e21484 260 case 0:
cholletisaik777 0:d6e3d1e21484 261 cdv = 512;
cholletisaik777 0:d6e3d1e21484 262 c_size = ext_bits(csd, 73, 62);
cholletisaik777 0:d6e3d1e21484 263 c_size_mult = ext_bits(csd, 49, 47);
cholletisaik777 0:d6e3d1e21484 264 read_bl_len = ext_bits(csd, 83, 80);
cholletisaik777 0:d6e3d1e21484 265
cholletisaik777 0:d6e3d1e21484 266 block_len = 1 << read_bl_len;
cholletisaik777 0:d6e3d1e21484 267 mult = 1 << (c_size_mult + 2);
cholletisaik777 0:d6e3d1e21484 268 blocknr = (c_size + 1) * mult;
cholletisaik777 0:d6e3d1e21484 269 capacity = blocknr * block_len;
cholletisaik777 0:d6e3d1e21484 270 blocks = capacity / 512;
cholletisaik777 0:d6e3d1e21484 271 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 272 break;
cholletisaik777 0:d6e3d1e21484 273
cholletisaik777 0:d6e3d1e21484 274 case 1:
cholletisaik777 0:d6e3d1e21484 275 cdv = 1;
cholletisaik777 0:d6e3d1e21484 276 hc_c_size = ext_bits(csd, 63, 48);
cholletisaik777 0:d6e3d1e21484 277 blocks = (hc_c_size+1)*1024;
cholletisaik777 0:d6e3d1e21484 278 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 279 break;
cholletisaik777 0:d6e3d1e21484 280
cholletisaik777 0:d6e3d1e21484 281 default:
cholletisaik777 0:d6e3d1e21484 282 debug("CSD struct unsupported\r\r\n");
cholletisaik777 0:d6e3d1e21484 283 return 0;
cholletisaik777 0:d6e3d1e21484 284 };
cholletisaik777 0:d6e3d1e21484 285 return blocks;
cholletisaik777 0:d6e3d1e21484 286 }
cholletisaik777 0:d6e3d1e21484 287
cholletisaik777 0:d6e3d1e21484 288 int cmdx(int cmd, int arg) {
cholletisaik777 0:d6e3d1e21484 289 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 290
cholletisaik777 0:d6e3d1e21484 291 // send a command
cholletisaik777 0:d6e3d1e21484 292 spi_SD.write(0x40 | cmd);
cholletisaik777 0:d6e3d1e21484 293 spi_SD.write(arg >> 24);
cholletisaik777 0:d6e3d1e21484 294 spi_SD.write(arg >> 16);
cholletisaik777 0:d6e3d1e21484 295 spi_SD.write(arg >> 8);
cholletisaik777 0:d6e3d1e21484 296 spi_SD.write(arg >> 0);
cholletisaik777 0:d6e3d1e21484 297 spi_SD.write(0x95);
cholletisaik777 0:d6e3d1e21484 298
cholletisaik777 0:d6e3d1e21484 299 // wait for the repsonse (response[7] == 0)
cholletisaik777 0:d6e3d1e21484 300 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
cholletisaik777 0:d6e3d1e21484 301 int response = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 302 if (!(response & 0x80)) {
cholletisaik777 0:d6e3d1e21484 303 return response;
cholletisaik777 0:d6e3d1e21484 304 }
cholletisaik777 0:d6e3d1e21484 305 }
cholletisaik777 0:d6e3d1e21484 306 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 307 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 308 return -1; // timeout
cholletisaik777 0:d6e3d1e21484 309 }
cholletisaik777 0:d6e3d1e21484 310
cholletisaik777 0:d6e3d1e21484 311
cholletisaik777 0:d6e3d1e21484 312 int read(uint8_t *buffer, uint32_t length) {
cholletisaik777 0:d6e3d1e21484 313 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 314
cholletisaik777 0:d6e3d1e21484 315 // read until start byte (0xFF)
cholletisaik777 0:d6e3d1e21484 316 while (spi_SD.write(0xFF) != 0xFE);
cholletisaik777 0:d6e3d1e21484 317
cholletisaik777 0:d6e3d1e21484 318 // read data
cholletisaik777 0:d6e3d1e21484 319 for (int i = 0; i < length; i++) {
cholletisaik777 0:d6e3d1e21484 320 buffer[i] = spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 321 }
cholletisaik777 0:d6e3d1e21484 322 spi_SD.write(0xFF); // checksum
cholletisaik777 0:d6e3d1e21484 323 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 324
cholletisaik777 0:d6e3d1e21484 325 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 326 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 327 return 0;
cholletisaik777 0:d6e3d1e21484 328 }
cholletisaik777 0:d6e3d1e21484 329
cholletisaik777 0:d6e3d1e21484 330 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
cholletisaik777 0:d6e3d1e21484 331 uint32_t bits = 0;
cholletisaik777 0:d6e3d1e21484 332 uint32_t size = 1 + msb - lsb;
cholletisaik777 0:d6e3d1e21484 333 for (int i = 0; i < size; i++) {
cholletisaik777 0:d6e3d1e21484 334 uint32_t position = lsb + i;
cholletisaik777 0:d6e3d1e21484 335 uint32_t byte = 15 - (position >> 3);
cholletisaik777 0:d6e3d1e21484 336 uint32_t bit = position & 0x7;
cholletisaik777 0:d6e3d1e21484 337 uint32_t value = (data[byte] >> bit) & 1;
cholletisaik777 0:d6e3d1e21484 338 bits |= value << i;
cholletisaik777 0:d6e3d1e21484 339 }
cholletisaik777 0:d6e3d1e21484 340 return bits;
cholletisaik777 0:d6e3d1e21484 341 }
cholletisaik777 0:d6e3d1e21484 342
cholletisaik777 0:d6e3d1e21484 343 int write(const uint8_t*buffer, uint32_t length) {
cholletisaik777 0:d6e3d1e21484 344 cs_SD = 0;
cholletisaik777 0:d6e3d1e21484 345
cholletisaik777 0:d6e3d1e21484 346 // indicate start of block
cholletisaik777 0:d6e3d1e21484 347 spi_SD.write(0xFE);
cholletisaik777 0:d6e3d1e21484 348
cholletisaik777 0:d6e3d1e21484 349 // write the data
cholletisaik777 0:d6e3d1e21484 350 for (int i = 0; i < length; i++) {
cholletisaik777 0:d6e3d1e21484 351 spi_SD.write(buffer[i]);
cholletisaik777 0:d6e3d1e21484 352 }
cholletisaik777 0:d6e3d1e21484 353
cholletisaik777 0:d6e3d1e21484 354 // write the checksum
cholletisaik777 0:d6e3d1e21484 355 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 356 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 357
cholletisaik777 0:d6e3d1e21484 358 // check the response token
cholletisaik777 0:d6e3d1e21484 359 if ((spi_SD.write(0xFF) & 0x1F) != 0x05) {
cholletisaik777 0:d6e3d1e21484 360 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 361 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 362 return 1;
cholletisaik777 0:d6e3d1e21484 363 }
cholletisaik777 0:d6e3d1e21484 364
cholletisaik777 0:d6e3d1e21484 365 // wait for write to finish
cholletisaik777 0:d6e3d1e21484 366 while (spi_SD.write(0xFF) == 0);
cholletisaik777 0:d6e3d1e21484 367
cholletisaik777 0:d6e3d1e21484 368 cs_SD = 1;
cholletisaik777 0:d6e3d1e21484 369 spi_SD.write(0xFF);
cholletisaik777 0:d6e3d1e21484 370 return 0;
cholletisaik777 0:d6e3d1e21484 371 }