Pradeep Kotipalli / Mbed 2 deprecated COM_MNG_TMTC_SIMPLE

sd 32 update

Dependencies:   FreescaleIAP mbed-rtos mbed

Fork of COM_MNG_TMTC_SIMPLE by Shreesha S

cdms_sd.h@72:7460872eef79, 2016-01-19 (annotated)

Committer:
pradeepvk2208
Date:
Tue Jan 19 12:29:15 2016 +0000
Revision:
72:7460872eef79
Parent:
71:9193fbdaa3e1 
sd update 32

Who changed what in which revision?

UserRevisionLine numberNew contents of line
krishanprajapat 71:9193fbdaa3e1 1
krishanprajapat 71:9193fbdaa3e1 2
krishanprajapat 71:9193fbdaa3e1 3
krishanprajapat 71:9193fbdaa3e1 4 SPI spi(PTE1, PTE3, PTE2); // MOSI,MISO, CLOCK microcontroller(in order)
krishanprajapat 71:9193fbdaa3e1 5 DigitalOut cs_sd(PTE22);
krishanprajapat 71:9193fbdaa3e1 6
krishanprajapat 71:9193fbdaa3e1 7 Serial sd1(USBTX,USBRX);
krishanprajapat 71:9193fbdaa3e1 8
krishanprajapat 71:9193fbdaa3e1 9
krishanprajapat 71:9193fbdaa3e1 10 #define SD_COMMAND_TIMEOUT 5000
krishanprajapat 71:9193fbdaa3e1 11
krishanprajapat 71:9193fbdaa3e1 12 #define SD_DBG 0
krishanprajapat 71:9193fbdaa3e1 13
krishanprajapat 71:9193fbdaa3e1 14 #define R1_IDLE_STATE (1 << 0)
krishanprajapat 71:9193fbdaa3e1 15 #define R1_ERASE_RESET (1 << 1)
krishanprajapat 71:9193fbdaa3e1 16 #define R1_ILLEGAL_COMMAND (1 << 2)
krishanprajapat 71:9193fbdaa3e1 17 #define R1_COM_CRC_ERROR (1 << 3)
krishanprajapat 71:9193fbdaa3e1 18 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
krishanprajapat 71:9193fbdaa3e1 19 #define R1_ADDRESS_ERROR (1 << 5)
krishanprajapat 71:9193fbdaa3e1 20 #define R1_PARAMETER_ERROR (1 << 6)
krishanprajapat 71:9193fbdaa3e1 21
krishanprajapat 71:9193fbdaa3e1 22
krishanprajapat 71:9193fbdaa3e1 23
krishanprajapat 71:9193fbdaa3e1 24 #define SD_MAX_CYCLES 10000
krishanprajapat 71:9193fbdaa3e1 25
krishanprajapat 71:9193fbdaa3e1 26 extern uint8_t SD_INIT_FLAGS;
krishanprajapat 71:9193fbdaa3e1 27
krishanprajapat 71:9193fbdaa3e1 28
krishanprajapat 71:9193fbdaa3e1 29
krishanprajapat 71:9193fbdaa3e1 30 int initialise_card();
krishanprajapat 71:9193fbdaa3e1 31 int initialise_card_v1();
krishanprajapat 71:9193fbdaa3e1 32 int initialise_card_v2();
krishanprajapat 71:9193fbdaa3e1 33 int disk_write(const uint8_t *, uint64_t);
krishanprajapat 71:9193fbdaa3e1 34 int disk_read(uint8_t *, uint64_t);
krishanprajapat 71:9193fbdaa3e1 35 int disk_initialize();
krishanprajapat 71:9193fbdaa3e1 36 int disk_erase(int,int);
krishanprajapat 71:9193fbdaa3e1 37
krishanprajapat 71:9193fbdaa3e1 38 //void FCTN_CDMS_INIT_SD();
krishanprajapat 71:9193fbdaa3e1 39 //int FCTN_CDMS_WR_SD(const uint8_t *, uint64_t);
krishanprajapat 71:9193fbdaa3e1 40 //int FCTN_CDMS_RD_SD(uint8_t *, uint64_t);
pradeepvk2208 72:7460872eef79 41 uint32_t FCTN_SD_MNGR(uint8_t);
krishanprajapat 71:9193fbdaa3e1 42
krishanprajapat 71:9193fbdaa3e1 43
krishanprajapat 71:9193fbdaa3e1 44 int cmd(int, int);
krishanprajapat 71:9193fbdaa3e1 45 int cmd58();
krishanprajapat 71:9193fbdaa3e1 46 int cmdx(int, int);
krishanprajapat 71:9193fbdaa3e1 47 int cmd8();
krishanprajapat 71:9193fbdaa3e1 48 int read(uint8_t*, uint32_t );
krishanprajapat 71:9193fbdaa3e1 49 int write(const uint8_t*, uint32_t );
krishanprajapat 71:9193fbdaa3e1 50 static uint32_t ext_bits(unsigned char *, int , int );
pradeepvk2208 72:7460872eef79 51 int SD_WRITE(uint8_t*,uint32_t,uint8_t);
krishanprajapat 71:9193fbdaa3e1 52 void FCTN_CDMS_SD_INIT();
pradeepvk2208 72:7460872eef79 53 int SD_READ(uint8_t*,uint32_t,uint8_t);
krishanprajapat 71:9193fbdaa3e1 54 #define SDCARD_FAIL 0
krishanprajapat 71:9193fbdaa3e1 55 #define SDCARD_V1 1
krishanprajapat 71:9193fbdaa3e1 56 #define SDCARD_V2 2
krishanprajapat 71:9193fbdaa3e1 57 #define SDCARD_V2HC 3
krishanprajapat 71:9193fbdaa3e1 58
krishanprajapat 71:9193fbdaa3e1 59
krishanprajapat 71:9193fbdaa3e1 60
krishanprajapat 71:9193fbdaa3e1 61
krishanprajapat 71:9193fbdaa3e1 62
krishanprajapat 71:9193fbdaa3e1 63
krishanprajapat 71:9193fbdaa3e1 64
krishanprajapat 71:9193fbdaa3e1 65
krishanprajapat 71:9193fbdaa3e1 66
krishanprajapat 71:9193fbdaa3e1 67
krishanprajapat 71:9193fbdaa3e1 68
krishanprajapat 71:9193fbdaa3e1 69 int cdv;
krishanprajapat 71:9193fbdaa3e1 70 uint64_t sd_sectors();
krishanprajapat 71:9193fbdaa3e1 71 uint64_t sectors;
krishanprajapat 71:9193fbdaa3e1 72
krishanprajapat 71:9193fbdaa3e1 73 void FCTN_CDMS_SD_INIT()
krishanprajapat 71:9193fbdaa3e1 74 {
krishanprajapat 71:9193fbdaa3e1 75
krishanprajapat 71:9193fbdaa3e1 76 initialise_card();
krishanprajapat 71:9193fbdaa3e1 77
krishanprajapat 71:9193fbdaa3e1 78 disk_initialize();
krishanprajapat 71:9193fbdaa3e1 79
krishanprajapat 71:9193fbdaa3e1 80 }
krishanprajapat 71:9193fbdaa3e1 81
krishanprajapat 71:9193fbdaa3e1 82
krishanprajapat 71:9193fbdaa3e1 83
pradeepvk2208 72:7460872eef79 84 uint32_t FCTN_SD_MNGR(uint8_t sid)
krishanprajapat 71:9193fbdaa3e1 85
krishanprajapat 71:9193fbdaa3e1 86 {
pradeepvk2208 72:7460872eef79 87
krishanprajapat 71:9193fbdaa3e1 88 uint32_t SD_MNG_SECT=7000;
pradeepvk2208 72:7460872eef79 89
pradeepvk2208 72:7460872eef79 90 uint32_t fsc;
pradeepvk2208 72:7460872eef79 91 uint8_t buffer[512];
pradeepvk2208 72:7460872eef79 92 int b=disk_read(buffer, SD_MNG_SECT);
krishanprajapat 71:9193fbdaa3e1 93 if(sid==0x0)
krishanprajapat 71:9193fbdaa3e1 94 {
pradeepvk2208 72:7460872eef79 95
pradeepvk2208 72:7460872eef79 96 fsc=(uint32_t)(buffer[0]<<24)+(uint32_t)(buffer[1]<<16)+(uint32_t)(buffer[2]<<8)+(uint32_t)buffer[3];
pradeepvk2208 72:7460872eef79 97 uint32_t next_fsc=fsc+1;
pradeepvk2208 72:7460872eef79 98 buffer[0]=(uint8_t) (next_fsc>>24 & 0xFF);
pradeepvk2208 72:7460872eef79 99 buffer[1]=(uint8_t) (next_fsc>>16 & 0xFF);
pradeepvk2208 72:7460872eef79 100 buffer[2]=(uint8_t) (next_fsc>>8 & 0xFF);
pradeepvk2208 72:7460872eef79 101 buffer[3]=(uint8_t) (next_fsc & 0xFF);
krishanprajapat 71:9193fbdaa3e1 102 buffer[511]+=2;
krishanprajapat 71:9193fbdaa3e1 103 disk_write(buffer,SD_MNG_SECT);
krishanprajapat 71:9193fbdaa3e1 104 }
krishanprajapat 71:9193fbdaa3e1 105 if(sid==0x1)
krishanprajapat 71:9193fbdaa3e1 106 {
pradeepvk2208 72:7460872eef79 107 fsc=(uint32_t)(buffer[4]<<24)+(uint32_t)(buffer[5]<<16)+(uint32_t)(buffer[6]<<8)+(uint32_t)buffer[7];
pradeepvk2208 72:7460872eef79 108 uint32_t next_fsc=fsc+1;
pradeepvk2208 72:7460872eef79 109 buffer[4]=(uint8_t) (next_fsc>>24 & 0xFF);
pradeepvk2208 72:7460872eef79 110 buffer[5]=(uint8_t) (next_fsc>>16 & 0xFF);
pradeepvk2208 72:7460872eef79 111 buffer[6]=(uint8_t) (next_fsc>>8 & 0xFF);
pradeepvk2208 72:7460872eef79 112 buffer[7]=(uint8_t) (next_fsc & 0xFF);
krishanprajapat 71:9193fbdaa3e1 113 buffer[511]+=2;
krishanprajapat 71:9193fbdaa3e1 114 disk_write(buffer,SD_MNG_SECT);
krishanprajapat 71:9193fbdaa3e1 115 }
krishanprajapat 71:9193fbdaa3e1 116 if(sid==0x2)
krishanprajapat 71:9193fbdaa3e1 117 {
pradeepvk2208 72:7460872eef79 118 fsc=(uint32_t)(buffer[8]<<24)+(uint32_t)(buffer[9]<<16)+(uint32_t)(buffer[10]<<8)+(uint32_t)buffer[11];
pradeepvk2208 72:7460872eef79 119 uint32_t next_fsc=fsc+1;
pradeepvk2208 72:7460872eef79 120 buffer[8]=(uint8_t) (next_fsc>>24 & 0xFF);
pradeepvk2208 72:7460872eef79 121 buffer[9]=(uint8_t) (next_fsc>>16 & 0xFF);
pradeepvk2208 72:7460872eef79 122 buffer[10]=(uint8_t) (next_fsc>>8 & 0xFF);
pradeepvk2208 72:7460872eef79 123 buffer[11]=(uint8_t) (next_fsc & 0xFF);
krishanprajapat 71:9193fbdaa3e1 124 buffer[511]+=2;
krishanprajapat 71:9193fbdaa3e1 125 disk_write(buffer,SD_MNG_SECT);
krishanprajapat 71:9193fbdaa3e1 126 }
krishanprajapat 71:9193fbdaa3e1 127 if(sid==0x3)
krishanprajapat 71:9193fbdaa3e1 128 {
pradeepvk2208 72:7460872eef79 129 fsc=(uint32_t)(buffer[12]<<24)+(uint32_t)(buffer[13]<<16)+(uint32_t)(buffer[14]<<8)+(uint32_t)buffer[15];
pradeepvk2208 72:7460872eef79 130 uint32_t next_fsc=fsc+1;
pradeepvk2208 72:7460872eef79 131 buffer[12]=(uint8_t) (next_fsc>>24 & 0xFF);
pradeepvk2208 72:7460872eef79 132 buffer[13]=(uint8_t) (next_fsc>>16 & 0xFF);
pradeepvk2208 72:7460872eef79 133 buffer[14]=(uint8_t) (next_fsc>>8 & 0xFF);
pradeepvk2208 72:7460872eef79 134 buffer[15]=(uint8_t) (next_fsc & 0xFF);
krishanprajapat 71:9193fbdaa3e1 135 buffer[511]+=2;
krishanprajapat 71:9193fbdaa3e1 136 disk_write(buffer,SD_MNG_SECT);
krishanprajapat 71:9193fbdaa3e1 137 }
krishanprajapat 71:9193fbdaa3e1 138 if(sid==0x4)
krishanprajapat 71:9193fbdaa3e1 139 {
pradeepvk2208 72:7460872eef79 140 fsc=(uint32_t)(buffer[16]<<24)+(uint32_t)(buffer[17]<<16)+(uint32_t)(buffer[18]<<8)+(uint32_t)buffer[19];
pradeepvk2208 72:7460872eef79 141 uint32_t next_fsc=fsc+1;
pradeepvk2208 72:7460872eef79 142 buffer[16]=(uint8_t) (next_fsc>>24 & 0xFF);
pradeepvk2208 72:7460872eef79 143 buffer[17]=(uint8_t) (next_fsc>>16 & 0xFF);
pradeepvk2208 72:7460872eef79 144 buffer[18]=(uint8_t) (next_fsc>>8 & 0xFF);
pradeepvk2208 72:7460872eef79 145 buffer[19]=(uint8_t) (next_fsc & 0xFF);
krishanprajapat 71:9193fbdaa3e1 146 buffer[511]+=2;
krishanprajapat 71:9193fbdaa3e1 147 disk_write(buffer,SD_MNG_SECT);
krishanprajapat 71:9193fbdaa3e1 148 }
krishanprajapat 71:9193fbdaa3e1 149 return fsc;
krishanprajapat 71:9193fbdaa3e1 150 }
krishanprajapat 71:9193fbdaa3e1 151
krishanprajapat 71:9193fbdaa3e1 152
pradeepvk2208 72:7460872eef79 153 int SD_WRITE(uint8_t* buffer,uint32_t fsc,uint8_t sid)
krishanprajapat 71:9193fbdaa3e1 154 {
krishanprajapat 71:9193fbdaa3e1 155
krishanprajapat 71:9193fbdaa3e1 156 uint32_t SD_SCP_FIRST=1001;
krishanprajapat 71:9193fbdaa3e1 157 uint32_t SD_SCP_LAST=2000;
krishanprajapat 71:9193fbdaa3e1 158 uint32_t SD_SFF_AT_FIRST=2001;
krishanprajapat 71:9193fbdaa3e1 159 uint32_t SD_SFF_AT_LAST = 3000;
krishanprajapat 71:9193fbdaa3e1 160 uint32_t SD_SFF_BT_FIRST =3001;
krishanprajapat 71:9193fbdaa3e1 161 uint32_t SD_SFF_BT_LAST=4000;
krishanprajapat 71:9193fbdaa3e1 162 uint32_t SD_HK_ARCH_FIRST=4001;
krishanprajapat 71:9193fbdaa3e1 163 uint32_t SD_HK_ARCH_LAST= 5000;
krishanprajapat 71:9193fbdaa3e1 164 uint32_t LOG_FIRST =5001;
krishanprajapat 71:9193fbdaa3e1 165 uint32_t LOG_LAST=6000;
krishanprajapat 71:9193fbdaa3e1 166 uint32_t SD_MNG_SECT=7000;
krishanprajapat 71:9193fbdaa3e1 167 uint32_t block_number;
krishanprajapat 71:9193fbdaa3e1 168 int result;
krishanprajapat 71:9193fbdaa3e1 169 if(sid==0x0)
krishanprajapat 71:9193fbdaa3e1 170 {
pradeepvk2208 72:7460872eef79 171 block_number=SD_SCP_FIRST+fsc;
krishanprajapat 71:9193fbdaa3e1 172 // printf("write_block_number=%d\r\n",block_number);
krishanprajapat 71:9193fbdaa3e1 173 result= disk_write(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 174 return result;
krishanprajapat 71:9193fbdaa3e1 175 }
krishanprajapat 71:9193fbdaa3e1 176 if(sid==0x1)
krishanprajapat 71:9193fbdaa3e1 177 {
krishanprajapat 71:9193fbdaa3e1 178 block_number=SD_SFF_AT_FIRST + fsc;
krishanprajapat 71:9193fbdaa3e1 179 result= disk_write(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 180 return result;
krishanprajapat 71:9193fbdaa3e1 181 }
krishanprajapat 71:9193fbdaa3e1 182 if(sid==0x2)
krishanprajapat 71:9193fbdaa3e1 183 {
krishanprajapat 71:9193fbdaa3e1 184 block_number=SD_SFF_BT_FIRST + fsc;
krishanprajapat 71:9193fbdaa3e1 185 result= disk_write(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 186 return result;
krishanprajapat 71:9193fbdaa3e1 187 }
krishanprajapat 71:9193fbdaa3e1 188 if(sid==0x3)
krishanprajapat 71:9193fbdaa3e1 189 {
krishanprajapat 71:9193fbdaa3e1 190 block_number=SD_HK_ARCH_FIRST+fsc;
krishanprajapat 71:9193fbdaa3e1 191 // sd1.printf("Block number is %d \r\n",block_number);
krishanprajapat 71:9193fbdaa3e1 192 result= disk_write(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 193 return result;
krishanprajapat 71:9193fbdaa3e1 194 }
krishanprajapat 71:9193fbdaa3e1 195 if(sid==0x4)
krishanprajapat 71:9193fbdaa3e1 196 {
krishanprajapat 71:9193fbdaa3e1 197 block_number=LOG_FIRST +fsc;
krishanprajapat 71:9193fbdaa3e1 198 result= disk_write(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 199 return result;
krishanprajapat 71:9193fbdaa3e1 200 }
krishanprajapat 71:9193fbdaa3e1 201 return 1;
krishanprajapat 71:9193fbdaa3e1 202 }
krishanprajapat 71:9193fbdaa3e1 203
pradeepvk2208 72:7460872eef79 204 int SD_READ(uint8_t* buffer,uint32_t fsc,uint8_t sid)
krishanprajapat 71:9193fbdaa3e1 205 {
krishanprajapat 71:9193fbdaa3e1 206
krishanprajapat 71:9193fbdaa3e1 207 uint32_t SD_SCP_FIRST=1001;
krishanprajapat 71:9193fbdaa3e1 208 uint32_t SD_SCP_LAST=2000;
krishanprajapat 71:9193fbdaa3e1 209 uint32_t SD_SFF_AT_FIRST=2001;
krishanprajapat 71:9193fbdaa3e1 210 uint32_t SD_SFF_AT_LAST = 3000;
krishanprajapat 71:9193fbdaa3e1 211 uint32_t SD_SFF_BT_FIRST =3001;
krishanprajapat 71:9193fbdaa3e1 212 uint32_t SD_SFF_BT_LAST=4000;
krishanprajapat 71:9193fbdaa3e1 213 uint32_t SD_HK_ARCH_FIRST=4001;
krishanprajapat 71:9193fbdaa3e1 214 uint32_t SD_HK_ARCH_LAST= 5000;
krishanprajapat 71:9193fbdaa3e1 215 uint32_t LOG_FIRST =5001;
krishanprajapat 71:9193fbdaa3e1 216 uint32_t LOG_LAST=6000;
krishanprajapat 71:9193fbdaa3e1 217 uint32_t SD_MNG_SECT=7000;
krishanprajapat 71:9193fbdaa3e1 218 uint32_t block_number;
krishanprajapat 71:9193fbdaa3e1 219 int result;
krishanprajapat 71:9193fbdaa3e1 220 if(sid==0x0)
krishanprajapat 71:9193fbdaa3e1 221 {
pradeepvk2208 72:7460872eef79 222 block_number=SD_SCP_FIRST + fsc;
krishanprajapat 71:9193fbdaa3e1 223 // sd1.printf("read_block_number=%d\r\n",block_number);
krishanprajapat 71:9193fbdaa3e1 224 result= disk_read(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 225 }
krishanprajapat 71:9193fbdaa3e1 226 else if(sid==0x1)
krishanprajapat 71:9193fbdaa3e1 227 {
krishanprajapat 71:9193fbdaa3e1 228 block_number=SD_SFF_AT_FIRST + fsc;
krishanprajapat 71:9193fbdaa3e1 229 result= disk_read(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 230 }
krishanprajapat 71:9193fbdaa3e1 231 else if(sid==0x2)
krishanprajapat 71:9193fbdaa3e1 232 {
krishanprajapat 71:9193fbdaa3e1 233 block_number=SD_SFF_BT_FIRST + fsc;
krishanprajapat 71:9193fbdaa3e1 234 result= disk_read(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 235 }
krishanprajapat 71:9193fbdaa3e1 236 else if(sid==0x3)
krishanprajapat 71:9193fbdaa3e1 237 {
krishanprajapat 71:9193fbdaa3e1 238 block_number=SD_HK_ARCH_FIRST + fsc;
krishanprajapat 71:9193fbdaa3e1 239 result= disk_read(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 240 }
krishanprajapat 71:9193fbdaa3e1 241 else if(sid==0x4)
krishanprajapat 71:9193fbdaa3e1 242 {
krishanprajapat 71:9193fbdaa3e1 243 block_number=LOG_FIRST +fsc;
krishanprajapat 71:9193fbdaa3e1 244 result= disk_read(buffer,block_number);
krishanprajapat 71:9193fbdaa3e1 245 }
krishanprajapat 71:9193fbdaa3e1 246 else
krishanprajapat 71:9193fbdaa3e1 247 {
krishanprajapat 71:9193fbdaa3e1 248 return 1;
krishanprajapat 71:9193fbdaa3e1 249 }
krishanprajapat 71:9193fbdaa3e1 250 return result;
krishanprajapat 71:9193fbdaa3e1 251 }
krishanprajapat 71:9193fbdaa3e1 252
krishanprajapat 71:9193fbdaa3e1 253
krishanprajapat 71:9193fbdaa3e1 254 int initialise_card()
krishanprajapat 71:9193fbdaa3e1 255 {
krishanprajapat 71:9193fbdaa3e1 256 // Set to 100kHz for initialisation, and clock card with cs_sd = 1
krishanprajapat 71:9193fbdaa3e1 257 spi.frequency(100000); // changed on 31 12 2015 to 1 MHz
krishanprajapat 71:9193fbdaa3e1 258 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 259 for (int i = 0; i < 16; i++) {
krishanprajapat 71:9193fbdaa3e1 260 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 261 }
krishanprajapat 71:9193fbdaa3e1 262
krishanprajapat 71:9193fbdaa3e1 263 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
krishanprajapat 71:9193fbdaa3e1 264 if (cmd(0, 0) != R1_IDLE_STATE) {
krishanprajapat 71:9193fbdaa3e1 265 debug("No disk, or could not put SD card in to spi idle state\r\n");
krishanprajapat 71:9193fbdaa3e1 266 return SDCARD_FAIL;
krishanprajapat 71:9193fbdaa3e1 267 }
krishanprajapat 71:9193fbdaa3e1 268
krishanprajapat 71:9193fbdaa3e1 269 // send CMD8 to determine whther it is ver 2.x
krishanprajapat 71:9193fbdaa3e1 270 int r = cmd8();
krishanprajapat 71:9193fbdaa3e1 271 if (r == R1_IDLE_STATE) {
krishanprajapat 71:9193fbdaa3e1 272 printf("\rEntering v2\r\n");
krishanprajapat 71:9193fbdaa3e1 273 return initialise_card_v2();
krishanprajapat 71:9193fbdaa3e1 274
krishanprajapat 71:9193fbdaa3e1 275 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
krishanprajapat 71:9193fbdaa3e1 276 printf("\rEntering v1\r\n");
krishanprajapat 71:9193fbdaa3e1 277 return initialise_card_v1();
krishanprajapat 71:9193fbdaa3e1 278
krishanprajapat 71:9193fbdaa3e1 279 } else {
krishanprajapat 71:9193fbdaa3e1 280 debug("\rNot in idle state after sending CMD8 (not an SD card?)\r\n");
krishanprajapat 71:9193fbdaa3e1 281 return SDCARD_FAIL;
krishanprajapat 71:9193fbdaa3e1 282 }
krishanprajapat 71:9193fbdaa3e1 283 }
krishanprajapat 71:9193fbdaa3e1 284
krishanprajapat 71:9193fbdaa3e1 285 int initialise_card_v1()
krishanprajapat 71:9193fbdaa3e1 286 {
krishanprajapat 71:9193fbdaa3e1 287 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
krishanprajapat 71:9193fbdaa3e1 288 cmd(55, 0);
krishanprajapat 71:9193fbdaa3e1 289 if (cmd(41, 0) == 0) {
krishanprajapat 71:9193fbdaa3e1 290 printf("\rv1 initialization successfull\r\n");
krishanprajapat 71:9193fbdaa3e1 291 cdv = 512;
krishanprajapat 71:9193fbdaa3e1 292 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
krishanprajapat 71:9193fbdaa3e1 293
krishanprajapat 71:9193fbdaa3e1 294 return SDCARD_V1;
krishanprajapat 71:9193fbdaa3e1 295 }
krishanprajapat 71:9193fbdaa3e1 296 }
krishanprajapat 71:9193fbdaa3e1 297
krishanprajapat 71:9193fbdaa3e1 298 debug("\rTimeout waiting for v1.x card\r\n");
krishanprajapat 71:9193fbdaa3e1 299 return SDCARD_FAIL;
krishanprajapat 71:9193fbdaa3e1 300 }
krishanprajapat 71:9193fbdaa3e1 301
krishanprajapat 71:9193fbdaa3e1 302
krishanprajapat 71:9193fbdaa3e1 303 int initialise_card_v2()
krishanprajapat 71:9193fbdaa3e1 304 {
krishanprajapat 71:9193fbdaa3e1 305 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
krishanprajapat 71:9193fbdaa3e1 306 wait_ms(50);
krishanprajapat 71:9193fbdaa3e1 307 cmd58();
krishanprajapat 71:9193fbdaa3e1 308 cmd(55, 0);
krishanprajapat 71:9193fbdaa3e1 309 if (cmd(41, 0x40000000) == 0) {
krishanprajapat 71:9193fbdaa3e1 310 printf("\rv2 initialization successfull\r\n");
krishanprajapat 71:9193fbdaa3e1 311 cmd58();
krishanprajapat 71:9193fbdaa3e1 312 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
krishanprajapat 71:9193fbdaa3e1 313 cdv = 1;
krishanprajapat 71:9193fbdaa3e1 314
krishanprajapat 71:9193fbdaa3e1 315 return SDCARD_V2;
krishanprajapat 71:9193fbdaa3e1 316 }
krishanprajapat 71:9193fbdaa3e1 317 }
krishanprajapat 71:9193fbdaa3e1 318
krishanprajapat 71:9193fbdaa3e1 319 debug("\rTimeout waiting for v2.x card\r\n");
krishanprajapat 71:9193fbdaa3e1 320 return SDCARD_FAIL;
krishanprajapat 71:9193fbdaa3e1 321 }
krishanprajapat 71:9193fbdaa3e1 322
krishanprajapat 71:9193fbdaa3e1 323 int cmd(int cmd, int arg)
krishanprajapat 71:9193fbdaa3e1 324 {
krishanprajapat 71:9193fbdaa3e1 325 cs_sd = 0;
krishanprajapat 71:9193fbdaa3e1 326
krishanprajapat 71:9193fbdaa3e1 327 // send a command
krishanprajapat 71:9193fbdaa3e1 328 spi.write(0x40 | cmd);
krishanprajapat 71:9193fbdaa3e1 329 spi.write(arg >> 24);
krishanprajapat 71:9193fbdaa3e1 330 spi.write(arg >> 16);
krishanprajapat 71:9193fbdaa3e1 331 spi.write(arg >> 8);
krishanprajapat 71:9193fbdaa3e1 332 spi.write(arg >> 0);
krishanprajapat 71:9193fbdaa3e1 333 spi.write(0x95);
krishanprajapat 71:9193fbdaa3e1 334
krishanprajapat 71:9193fbdaa3e1 335 // wait for the repsonse (response[7] == 0)
krishanprajapat 71:9193fbdaa3e1 336 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
krishanprajapat 71:9193fbdaa3e1 337 int response = spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 338 if (!(response & 0x80)) {
krishanprajapat 71:9193fbdaa3e1 339 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 340 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 341 return response;
krishanprajapat 71:9193fbdaa3e1 342 }
krishanprajapat 71:9193fbdaa3e1 343 }
krishanprajapat 71:9193fbdaa3e1 344 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 345 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 346 return -1; // timeout
krishanprajapat 71:9193fbdaa3e1 347 }
krishanprajapat 71:9193fbdaa3e1 348
krishanprajapat 71:9193fbdaa3e1 349
krishanprajapat 71:9193fbdaa3e1 350 int cmd58()
krishanprajapat 71:9193fbdaa3e1 351 {
krishanprajapat 71:9193fbdaa3e1 352 cs_sd = 0;
krishanprajapat 71:9193fbdaa3e1 353 int arg = 0;
krishanprajapat 71:9193fbdaa3e1 354
krishanprajapat 71:9193fbdaa3e1 355 // send a command
krishanprajapat 71:9193fbdaa3e1 356 spi.write(0x40 | 58);
krishanprajapat 71:9193fbdaa3e1 357 spi.write(arg >> 24);
krishanprajapat 71:9193fbdaa3e1 358 spi.write(arg >> 16);
krishanprajapat 71:9193fbdaa3e1 359 spi.write(arg >> 8);
krishanprajapat 71:9193fbdaa3e1 360 spi.write(arg >> 0);
krishanprajapat 71:9193fbdaa3e1 361 spi.write(0x95);
krishanprajapat 71:9193fbdaa3e1 362
krishanprajapat 71:9193fbdaa3e1 363 // wait for the repsonse (response[7] == 0)
krishanprajapat 71:9193fbdaa3e1 364 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
krishanprajapat 71:9193fbdaa3e1 365 int response = spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 366 if (!(response & 0x80)) {
krishanprajapat 71:9193fbdaa3e1 367 int ocr = spi.write(0xFF) << 24;
krishanprajapat 71:9193fbdaa3e1 368 ocr |= spi.write(0xFF) << 16;
krishanprajapat 71:9193fbdaa3e1 369 ocr |= spi.write(0xFF) << 8;
krishanprajapat 71:9193fbdaa3e1 370 ocr |= spi.write(0xFF) << 0;
krishanprajapat 71:9193fbdaa3e1 371 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 372 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 373 return response;
krishanprajapat 71:9193fbdaa3e1 374 }
krishanprajapat 71:9193fbdaa3e1 375 }
krishanprajapat 71:9193fbdaa3e1 376 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 377 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 378 return -1; // timeout
krishanprajapat 71:9193fbdaa3e1 379 }
krishanprajapat 71:9193fbdaa3e1 380
krishanprajapat 71:9193fbdaa3e1 381
krishanprajapat 71:9193fbdaa3e1 382 int cmd8()
krishanprajapat 71:9193fbdaa3e1 383 {
krishanprajapat 71:9193fbdaa3e1 384 cs_sd = 0;
krishanprajapat 71:9193fbdaa3e1 385
krishanprajapat 71:9193fbdaa3e1 386 // send a command
krishanprajapat 71:9193fbdaa3e1 387 spi.write(0x40 | 8); // CMD8
krishanprajapat 71:9193fbdaa3e1 388 spi.write(0x00); // reserved
krishanprajapat 71:9193fbdaa3e1 389 spi.write(0x00); // reserved
krishanprajapat 71:9193fbdaa3e1 390 spi.write(0x01); // 3.3v
krishanprajapat 71:9193fbdaa3e1 391 spi.write(0xAA); // check pattern
krishanprajapat 71:9193fbdaa3e1 392 spi.write(0x87); // crc
krishanprajapat 71:9193fbdaa3e1 393
krishanprajapat 71:9193fbdaa3e1 394 // wait for the repsonse (response[7] == 0)
krishanprajapat 71:9193fbdaa3e1 395 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
krishanprajapat 71:9193fbdaa3e1 396 char response[5];
krishanprajapat 71:9193fbdaa3e1 397 response[0] = spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 398 if (!(response[0] & 0x80)) {
krishanprajapat 71:9193fbdaa3e1 399 for (int j = 1; j < 5; j++) {
krishanprajapat 71:9193fbdaa3e1 400 response[i] = spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 401 }
krishanprajapat 71:9193fbdaa3e1 402 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 403 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 404 return response[0];
krishanprajapat 71:9193fbdaa3e1 405 }
krishanprajapat 71:9193fbdaa3e1 406 }
krishanprajapat 71:9193fbdaa3e1 407 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 408 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 409 return -1; // timeout
krishanprajapat 71:9193fbdaa3e1 410 }
krishanprajapat 71:9193fbdaa3e1 411
krishanprajapat 71:9193fbdaa3e1 412 uint64_t sd_sectors()
krishanprajapat 71:9193fbdaa3e1 413 {
krishanprajapat 71:9193fbdaa3e1 414 uint32_t c_size, c_size_mult, read_bl_len;
krishanprajapat 71:9193fbdaa3e1 415 uint32_t block_len, mult, blocknr, capacity;
krishanprajapat 71:9193fbdaa3e1 416 uint32_t hc_c_size;
krishanprajapat 71:9193fbdaa3e1 417 uint64_t blocks;
krishanprajapat 71:9193fbdaa3e1 418
krishanprajapat 71:9193fbdaa3e1 419 // CMD9, Response R2 (R1 byte + 16-byte block read)
krishanprajapat 71:9193fbdaa3e1 420 if (cmdx(9, 0) != 0) {
krishanprajapat 71:9193fbdaa3e1 421 debug("\rDidn't get a response from the disk\n");
krishanprajapat 71:9193fbdaa3e1 422 return 0;
krishanprajapat 71:9193fbdaa3e1 423 }
krishanprajapat 71:9193fbdaa3e1 424
krishanprajapat 71:9193fbdaa3e1 425 uint8_t cs_sdd[16];
krishanprajapat 71:9193fbdaa3e1 426 if (read(cs_sdd, 16) != 0) {
krishanprajapat 71:9193fbdaa3e1 427 debug("\rCouldn't read cs_sdd response from disk\n");
krishanprajapat 71:9193fbdaa3e1 428 return 0;
krishanprajapat 71:9193fbdaa3e1 429 }
krishanprajapat 71:9193fbdaa3e1 430
krishanprajapat 71:9193fbdaa3e1 431 // cs_sdd_structure : cs_sdd[127:126]
krishanprajapat 71:9193fbdaa3e1 432 // c_size : cs_sdd[73:62]
krishanprajapat 71:9193fbdaa3e1 433 // c_size_mult : cs_sdd[49:47]
krishanprajapat 71:9193fbdaa3e1 434 // read_bl_len : cs_sdd[83:80] - the *maximum* read block length
krishanprajapat 71:9193fbdaa3e1 435
krishanprajapat 71:9193fbdaa3e1 436 int cs_sdd_structure = ext_bits(cs_sdd, 127, 126);
krishanprajapat 71:9193fbdaa3e1 437
krishanprajapat 71:9193fbdaa3e1 438 switch (cs_sdd_structure) {
krishanprajapat 71:9193fbdaa3e1 439 case 0:
krishanprajapat 71:9193fbdaa3e1 440 cdv = 512;
krishanprajapat 71:9193fbdaa3e1 441 c_size = ext_bits(cs_sdd, 73, 62);
krishanprajapat 71:9193fbdaa3e1 442 c_size_mult = ext_bits(cs_sdd, 49, 47);
krishanprajapat 71:9193fbdaa3e1 443 read_bl_len = ext_bits(cs_sdd, 83, 80);
krishanprajapat 71:9193fbdaa3e1 444
krishanprajapat 71:9193fbdaa3e1 445 block_len = 1 << read_bl_len;
krishanprajapat 71:9193fbdaa3e1 446 mult = 1 << (c_size_mult + 2);
krishanprajapat 71:9193fbdaa3e1 447 blocknr = (c_size + 1) * mult;
krishanprajapat 71:9193fbdaa3e1 448 capacity = blocknr * block_len;
krishanprajapat 71:9193fbdaa3e1 449 blocks = capacity / 512;
krishanprajapat 71:9193fbdaa3e1 450 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
krishanprajapat 71:9193fbdaa3e1 451 break;
krishanprajapat 71:9193fbdaa3e1 452
krishanprajapat 71:9193fbdaa3e1 453 case 1:
krishanprajapat 71:9193fbdaa3e1 454 cdv = 1;
krishanprajapat 71:9193fbdaa3e1 455 hc_c_size = ext_bits(cs_sdd, 63, 48);
krishanprajapat 71:9193fbdaa3e1 456 blocks = (hc_c_size+1)*1024;
krishanprajapat 71:9193fbdaa3e1 457 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);
krishanprajapat 71:9193fbdaa3e1 458 break;
krishanprajapat 71:9193fbdaa3e1 459
krishanprajapat 71:9193fbdaa3e1 460 default:
krishanprajapat 71:9193fbdaa3e1 461 debug("cs_sdD struct unsupported\r\n");
krishanprajapat 71:9193fbdaa3e1 462 return 0;
krishanprajapat 71:9193fbdaa3e1 463 };
krishanprajapat 71:9193fbdaa3e1 464 return blocks;
krishanprajapat 71:9193fbdaa3e1 465 }
krishanprajapat 71:9193fbdaa3e1 466
krishanprajapat 71:9193fbdaa3e1 467 int cmdx(int cmd, int arg)
krishanprajapat 71:9193fbdaa3e1 468 {
krishanprajapat 71:9193fbdaa3e1 469 cs_sd = 0;
krishanprajapat 71:9193fbdaa3e1 470
krishanprajapat 71:9193fbdaa3e1 471 // send a command
krishanprajapat 71:9193fbdaa3e1 472 spi.write(0x40 | cmd);
krishanprajapat 71:9193fbdaa3e1 473 spi.write(arg >> 24);
krishanprajapat 71:9193fbdaa3e1 474 spi.write(arg >> 16);
krishanprajapat 71:9193fbdaa3e1 475 spi.write(arg >> 8);
krishanprajapat 71:9193fbdaa3e1 476 spi.write(arg >> 0);
krishanprajapat 71:9193fbdaa3e1 477 spi.write(0x95);
krishanprajapat 71:9193fbdaa3e1 478
krishanprajapat 71:9193fbdaa3e1 479 // wait for the repsonse (response[7] == 0)
krishanprajapat 71:9193fbdaa3e1 480 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
krishanprajapat 71:9193fbdaa3e1 481 int response = spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 482 if (!(response & 0x80)) {
krishanprajapat 71:9193fbdaa3e1 483 return response;
krishanprajapat 71:9193fbdaa3e1 484 }
krishanprajapat 71:9193fbdaa3e1 485 }
krishanprajapat 71:9193fbdaa3e1 486 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 487 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 488 return -1; // timeout
krishanprajapat 71:9193fbdaa3e1 489 }
krishanprajapat 71:9193fbdaa3e1 490
krishanprajapat 71:9193fbdaa3e1 491 static uint32_t ext_bits(unsigned char *data, int msb, int lsb)
krishanprajapat 71:9193fbdaa3e1 492 {
krishanprajapat 71:9193fbdaa3e1 493 uint32_t bits = 0;
krishanprajapat 71:9193fbdaa3e1 494 uint32_t size = 1 + msb - lsb;
krishanprajapat 71:9193fbdaa3e1 495 for (int i = 0; i < size; i++) {
krishanprajapat 71:9193fbdaa3e1 496 uint32_t position = lsb + i;
krishanprajapat 71:9193fbdaa3e1 497 uint32_t byte = 15 - (position >> 3);
krishanprajapat 71:9193fbdaa3e1 498 uint32_t bit = position & 0x7;
krishanprajapat 71:9193fbdaa3e1 499 uint32_t value = (data[byte] >> bit) & 1;
krishanprajapat 71:9193fbdaa3e1 500 bits |= value << i;
krishanprajapat 71:9193fbdaa3e1 501 }
krishanprajapat 71:9193fbdaa3e1 502 return bits;
krishanprajapat 71:9193fbdaa3e1 503 }
krishanprajapat 71:9193fbdaa3e1 504
krishanprajapat 71:9193fbdaa3e1 505 int disk_initialize()
krishanprajapat 71:9193fbdaa3e1 506 {
krishanprajapat 71:9193fbdaa3e1 507 int i = initialise_card();
krishanprajapat 71:9193fbdaa3e1 508 debug_if(SD_DBG, "init card = %d\n", i);
krishanprajapat 71:9193fbdaa3e1 509 sectors = sd_sectors();
krishanprajapat 71:9193fbdaa3e1 510
krishanprajapat 71:9193fbdaa3e1 511 // Set block length to 512 (CMD16)
krishanprajapat 71:9193fbdaa3e1 512 if (cmd(16, 512) != 0) {
krishanprajapat 71:9193fbdaa3e1 513 debug("\rSet 512-byte block timed out\r\n");
krishanprajapat 71:9193fbdaa3e1 514 return 1;
krishanprajapat 71:9193fbdaa3e1 515 } else {
krishanprajapat 71:9193fbdaa3e1 516 printf("\rDisk initialization successfull\r\n");
krishanprajapat 71:9193fbdaa3e1 517 }
krishanprajapat 71:9193fbdaa3e1 518
krishanprajapat 71:9193fbdaa3e1 519 spi.frequency(1000000); // Set to 1MHz for data transfer
krishanprajapat 71:9193fbdaa3e1 520 return 0;
krishanprajapat 71:9193fbdaa3e1 521 }
krishanprajapat 71:9193fbdaa3e1 522
krishanprajapat 71:9193fbdaa3e1 523 int disk_write(const uint8_t *buffer, uint64_t block_number)
krishanprajapat 71:9193fbdaa3e1 524
krishanprajapat 71:9193fbdaa3e1 525 {
krishanprajapat 71:9193fbdaa3e1 526 // set write address for single block (CMD24)
krishanprajapat 71:9193fbdaa3e1 527 if (cmd(24, block_number * cdv) != 0) {
krishanprajapat 71:9193fbdaa3e1 528 return 1;
krishanprajapat 71:9193fbdaa3e1 529 }
krishanprajapat 71:9193fbdaa3e1 530
krishanprajapat 71:9193fbdaa3e1 531 // send the data block
krishanprajapat 71:9193fbdaa3e1 532 write(buffer, 512);
krishanprajapat 71:9193fbdaa3e1 533 //printf("Written Successfully bro \n");
krishanprajapat 71:9193fbdaa3e1 534 return 0;
krishanprajapat 71:9193fbdaa3e1 535 }
krishanprajapat 71:9193fbdaa3e1 536
krishanprajapat 71:9193fbdaa3e1 537 int write(const uint8_t*buffer, uint32_t length)
krishanprajapat 71:9193fbdaa3e1 538 {
krishanprajapat 71:9193fbdaa3e1 539 cs_sd = 0;
krishanprajapat 71:9193fbdaa3e1 540
krishanprajapat 71:9193fbdaa3e1 541 // indicate start of block
krishanprajapat 71:9193fbdaa3e1 542 spi.write(0xFE);
krishanprajapat 71:9193fbdaa3e1 543
krishanprajapat 71:9193fbdaa3e1 544 // write the data
krishanprajapat 71:9193fbdaa3e1 545 for (int i = 0; i < length; i++) {
krishanprajapat 71:9193fbdaa3e1 546 spi.write(buffer[i]);
krishanprajapat 71:9193fbdaa3e1 547 }
krishanprajapat 71:9193fbdaa3e1 548
krishanprajapat 71:9193fbdaa3e1 549 // write the checksum
krishanprajapat 71:9193fbdaa3e1 550 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 551 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 552
krishanprajapat 71:9193fbdaa3e1 553 // check the response token
krishanprajapat 71:9193fbdaa3e1 554 if ((spi.write(0xFF) & 0x1F) != 0x05) {
krishanprajapat 71:9193fbdaa3e1 555 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 556 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 557 return 1;
krishanprajapat 71:9193fbdaa3e1 558 }
krishanprajapat 71:9193fbdaa3e1 559
krishanprajapat 71:9193fbdaa3e1 560 // wait for write to finish
krishanprajapat 71:9193fbdaa3e1 561 while (spi.write(0xFF) == 0);
krishanprajapat 71:9193fbdaa3e1 562
krishanprajapat 71:9193fbdaa3e1 563 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 564 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 565 return 0;
krishanprajapat 71:9193fbdaa3e1 566 }
krishanprajapat 71:9193fbdaa3e1 567
krishanprajapat 71:9193fbdaa3e1 568 int disk_read(uint8_t *buffer, uint64_t block_number)
krishanprajapat 71:9193fbdaa3e1 569 {
krishanprajapat 71:9193fbdaa3e1 570 // set read address for single block (CMD17)
krishanprajapat 71:9193fbdaa3e1 571 if (cmd(17, block_number * cdv) != 0) {
krishanprajapat 71:9193fbdaa3e1 572 return 1;
krishanprajapat 71:9193fbdaa3e1 573 }
krishanprajapat 71:9193fbdaa3e1 574
krishanprajapat 71:9193fbdaa3e1 575 // receive the data
krishanprajapat 71:9193fbdaa3e1 576 read(buffer, 512);
krishanprajapat 71:9193fbdaa3e1 577 return 0;
krishanprajapat 71:9193fbdaa3e1 578 }
krishanprajapat 71:9193fbdaa3e1 579
krishanprajapat 71:9193fbdaa3e1 580 int read(uint8_t *buffer, uint32_t length)
krishanprajapat 71:9193fbdaa3e1 581 {
krishanprajapat 71:9193fbdaa3e1 582 cs_sd = 0;
krishanprajapat 71:9193fbdaa3e1 583
krishanprajapat 71:9193fbdaa3e1 584 // read until start byte (0xFF)
krishanprajapat 71:9193fbdaa3e1 585 while (spi.write(0xFF) != 0xFE);
krishanprajapat 71:9193fbdaa3e1 586
krishanprajapat 71:9193fbdaa3e1 587 // read data
krishanprajapat 71:9193fbdaa3e1 588 for (int i = 0; i < length; i++) {
krishanprajapat 71:9193fbdaa3e1 589 buffer[i] = spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 590 }
krishanprajapat 71:9193fbdaa3e1 591 spi.write(0xFF); // checksum
krishanprajapat 71:9193fbdaa3e1 592 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 593
krishanprajapat 71:9193fbdaa3e1 594 cs_sd = 1;
krishanprajapat 71:9193fbdaa3e1 595 spi.write(0xFF);
krishanprajapat 71:9193fbdaa3e1 596 return 0;
krishanprajapat 71:9193fbdaa3e1 597 }
krishanprajapat 71:9193fbdaa3e1 598
krishanprajapat 71:9193fbdaa3e1 599 int disk_erase(int startBlock, int totalBlocks)
krishanprajapat 71:9193fbdaa3e1 600 {
krishanprajapat 71:9193fbdaa3e1 601 if(cmd(32, startBlock * cdv) != 0) {
krishanprajapat 71:9193fbdaa3e1 602 return 1;
krishanprajapat 71:9193fbdaa3e1 603 }
krishanprajapat 71:9193fbdaa3e1 604 if (cmd(33, (startBlock+totalBlocks-1) * cdv) != 0) {
krishanprajapat 71:9193fbdaa3e1 605 return 1;
krishanprajapat 71:9193fbdaa3e1 606 }
krishanprajapat 71:9193fbdaa3e1 607 if (cmd(38,0) != 0) {
krishanprajapat 71:9193fbdaa3e1 608 return 1;
krishanprajapat 71:9193fbdaa3e1 609 }
krishanprajapat 71:9193fbdaa3e1 610
krishanprajapat 71:9193fbdaa3e1 611 return 0; //normal return
krishanprajapat 71:9193fbdaa3e1 612 }