ferney alberto beltran molina / Mbed 2 deprecated 00_LAB_SD_INITIAL

prueba sd card

Dependencies:   mbed

main.cpp@0:9b6d6fa5c401, 2018-04-17 (annotated)

Committer:
fabeltranm
Date:
Tue Apr 17 23:34:09 2018 +0000
Revision:
0:9b6d6fa5c401
sdcard

Who changed what in which revision?

UserRevisionLine numberNew contents of line
fabeltranm 0:9b6d6fa5c401 1 #include "mbed.h"
fabeltranm 0:9b6d6fa5c401 2 /* SPI Command Format
fabeltranm 0:9b6d6fa5c401 3 * ------------------
fabeltranm 0:9b6d6fa5c401 4 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
fabeltranm 0:9b6d6fa5c401 5 *
fabeltranm 0:9b6d6fa5c401 6 * +---------------+------------+------------+-----------+----------+--------------+
fabeltranm 0:9b6d6fa5c401 7 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
fabeltranm 0:9b6d6fa5c401 8 * +---------------+------------+------------+-----------+----------+--------------+
fabeltranm 0:9b6d6fa5c401 9 *
fabeltranm 0:9b6d6fa5c401 10 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
fabeltranm 0:9b6d6fa5c401 11 *
fabeltranm 0:9b6d6fa5c401 12 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
fabeltranm 0:9b6d6fa5c401 13 *
fabeltranm 0:9b6d6fa5c401 14 * SPI Response Format
fabeltranm 0:9b6d6fa5c401 15 * -------------------
fabeltranm 0:9b6d6fa5c401 16 * The main response format (R1) is a status byte (normally zero). Key flags:
fabeltranm 0:9b6d6fa5c401 17 * idle - 1 if the card is in an idle state/initialising
fabeltranm 0:9b6d6fa5c401 18 * cmd - 1 if an illegal command code was detected
fabeltranm 0:9b6d6fa5c401 19 *
fabeltranm 0:9b6d6fa5c401 20 * +-------------------------------------------------+
fabeltranm 0:9b6d6fa5c401 21 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
fabeltranm 0:9b6d6fa5c401 22 * +-------------------------------------------------+
fabeltranm 0:9b6d6fa5c401 23 *
fabeltranm 0:9b6d6fa5c401 24 * R1b is the same, except it is followed by a busy signal (zeros) until
fabeltranm 0:9b6d6fa5c401 25 * the first non-zero byte when it is ready again.
fabeltranm 0:9b6d6fa5c401 26 *
fabeltranm 0:9b6d6fa5c401 27 * Data Response Token
fabeltranm 0:9b6d6fa5c401 28 * -------------------
fabeltranm 0:9b6d6fa5c401 29 * Every data block written to the card is acknowledged by a byte
fabeltranm 0:9b6d6fa5c401 30 * response token
fabeltranm 0:9b6d6fa5c401 31 *
fabeltranm 0:9b6d6fa5c401 32 * +----------------------+
fabeltranm 0:9b6d6fa5c401 33 * | xxx | 0 | status | 1 |
fabeltranm 0:9b6d6fa5c401 34 * +----------------------+
fabeltranm 0:9b6d6fa5c401 35 * 010 - OK!
fabeltranm 0:9b6d6fa5c401 36 * 101 - CRC Error
fabeltranm 0:9b6d6fa5c401 37 * 110 - Write Error
fabeltranm 0:9b6d6fa5c401 38 *
fabeltranm 0:9b6d6fa5c401 39 * Single Block Read and Write
fabeltranm 0:9b6d6fa5c401 40 * ---------------------------
fabeltranm 0:9b6d6fa5c401 41 *
fabeltranm 0:9b6d6fa5c401 42 * Block transfers have a byte header, followed by the data, followed
fabeltranm 0:9b6d6fa5c401 43 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
fabeltranm 0:9b6d6fa5c401 44 *
fabeltranm 0:9b6d6fa5c401 45 * +------+---------+---------+- - - -+---------+-----------+----------+
fabeltranm 0:9b6d6fa5c401 46 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
fabeltranm 0:9b6d6fa5c401 47 * +------+---------+---------+- - - -+---------+-----------+----------+
fabeltranm 0:9b6d6fa5c401 48 */
fabeltranm 0:9b6d6fa5c401 49
fabeltranm 0:9b6d6fa5c401 50
fabeltranm 0:9b6d6fa5c401 51 #define SD_COMMAND_TIMEOUT 5000
fabeltranm 0:9b6d6fa5c401 52
fabeltranm 0:9b6d6fa5c401 53 #define R1_IDLE_STATE (1 << 0)
fabeltranm 0:9b6d6fa5c401 54 #define R1_ERASE_RESET (1 << 1)
fabeltranm 0:9b6d6fa5c401 55 #define R1_ILLEGAL_COMMAND (1 << 2)
fabeltranm 0:9b6d6fa5c401 56 #define R1_COM_CRC_ERROR (1 << 3)
fabeltranm 0:9b6d6fa5c401 57 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
fabeltranm 0:9b6d6fa5c401 58 #define R1_ADDRESS_ERROR (1 << 5)
fabeltranm 0:9b6d6fa5c401 59 #define R1_PARAMETER_ERROR (1 << 6)
fabeltranm 0:9b6d6fa5c401 60
fabeltranm 0:9b6d6fa5c401 61 #define SDCARD_FAIL 0
fabeltranm 0:9b6d6fa5c401 62 #define SDCARD_V1 1
fabeltranm 0:9b6d6fa5c401 63 #define SDCARD_V2 2
fabeltranm 0:9b6d6fa5c401 64 #define SDCARD_V2HC 3
fabeltranm 0:9b6d6fa5c401 65 #define SD_DBG 0
fabeltranm 0:9b6d6fa5c401 66
fabeltranm 0:9b6d6fa5c401 67 SPI sd(PB_15, PB_14, PB_13); //miso,mosi, sclk
fabeltranm 0:9b6d6fa5c401 68 DigitalOut ssel (PB_12);
fabeltranm 0:9b6d6fa5c401 69
fabeltranm 0:9b6d6fa5c401 70 int cmd(int cmd, int arg);
fabeltranm 0:9b6d6fa5c401 71 int cmd8();
fabeltranm 0:9b6d6fa5c401 72 int cmd58();
fabeltranm 0:9b6d6fa5c401 73 int initialise_card();
fabeltranm 0:9b6d6fa5c401 74 int cdv;
fabeltranm 0:9b6d6fa5c401 75
fabeltranm 0:9b6d6fa5c401 76
fabeltranm 0:9b6d6fa5c401 77 void main ()
fabeltranm 0:9b6d6fa5c401 78 {
fabeltranm 0:9b6d6fa5c401 79 spi.format(16, 0);
fabeltranm 0:9b6d6fa5c401 80 sd.frequency(2);
fabeltranm 0:9b6d6fa5c401 81 while(1)
fabeltranm 0:9b6d6fa5c401 82 sd.write(0xAA);
fabeltranm 0:9b6d6fa5c401 83
fabeltranm 0:9b6d6fa5c401 84 initialise_card();
fabeltranm 0:9b6d6fa5c401 85
fabeltranm 0:9b6d6fa5c401 86 }
fabeltranm 0:9b6d6fa5c401 87
fabeltranm 0:9b6d6fa5c401 88
fabeltranm 0:9b6d6fa5c401 89 int cmd(int cmd, int arg) {
fabeltranm 0:9b6d6fa5c401 90 ssel = 0;
fabeltranm 0:9b6d6fa5c401 91
fabeltranm 0:9b6d6fa5c401 92 // send a command
fabeltranm 0:9b6d6fa5c401 93 sd.write(0x40 | cmd);
fabeltranm 0:9b6d6fa5c401 94 sd.write(arg >> 24);
fabeltranm 0:9b6d6fa5c401 95 sd.write(arg >> 16);
fabeltranm 0:9b6d6fa5c401 96 sd.write(arg >> 8);
fabeltranm 0:9b6d6fa5c401 97 sd.write(arg >> 0);
fabeltranm 0:9b6d6fa5c401 98 sd.write(0x95);
fabeltranm 0:9b6d6fa5c401 99
fabeltranm 0:9b6d6fa5c401 100 // wait for the repsonse (response[7] == 0)
fabeltranm 0:9b6d6fa5c401 101 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
fabeltranm 0:9b6d6fa5c401 102 int response = sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 103 if (!(response & 0x80)) {
fabeltranm 0:9b6d6fa5c401 104 ssel= 1;
fabeltranm 0:9b6d6fa5c401 105 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 106 return response;
fabeltranm 0:9b6d6fa5c401 107 }
fabeltranm 0:9b6d6fa5c401 108 }
fabeltranm 0:9b6d6fa5c401 109 ssel = 1;
fabeltranm 0:9b6d6fa5c401 110 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 111 return -1; // timeout
fabeltranm 0:9b6d6fa5c401 112 }
fabeltranm 0:9b6d6fa5c401 113
fabeltranm 0:9b6d6fa5c401 114
fabeltranm 0:9b6d6fa5c401 115 int initialise_card_v1() {
fabeltranm 0:9b6d6fa5c401 116 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
fabeltranm 0:9b6d6fa5c401 117 cmd(55, 0);
fabeltranm 0:9b6d6fa5c401 118 if (cmd(41, 0) == 0) {
fabeltranm 0:9b6d6fa5c401 119 cdv = 512;
fabeltranm 0:9b6d6fa5c401 120 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
fabeltranm 0:9b6d6fa5c401 121 return SDCARD_V1;
fabeltranm 0:9b6d6fa5c401 122 }
fabeltranm 0:9b6d6fa5c401 123 }
fabeltranm 0:9b6d6fa5c401 124
fabeltranm 0:9b6d6fa5c401 125 debug("Timeout waiting for v1.x card\n");
fabeltranm 0:9b6d6fa5c401 126 return SDCARD_FAIL;
fabeltranm 0:9b6d6fa5c401 127 }
fabeltranm 0:9b6d6fa5c401 128
fabeltranm 0:9b6d6fa5c401 129 int initialise_card_v2() {
fabeltranm 0:9b6d6fa5c401 130 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
fabeltranm 0:9b6d6fa5c401 131 wait_ms(50);
fabeltranm 0:9b6d6fa5c401 132 cmd58();
fabeltranm 0:9b6d6fa5c401 133 cmd(55, 0);
fabeltranm 0:9b6d6fa5c401 134 if (cmd(41, 0x40000000) == 0) {
fabeltranm 0:9b6d6fa5c401 135 cmd58();
fabeltranm 0:9b6d6fa5c401 136 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
fabeltranm 0:9b6d6fa5c401 137 cdv = 1;
fabeltranm 0:9b6d6fa5c401 138 return SDCARD_V2;
fabeltranm 0:9b6d6fa5c401 139 }
fabeltranm 0:9b6d6fa5c401 140 }
fabeltranm 0:9b6d6fa5c401 141
fabeltranm 0:9b6d6fa5c401 142 debug("Timeout waiting for v2.x card\n");
fabeltranm 0:9b6d6fa5c401 143 return SDCARD_FAIL;
fabeltranm 0:9b6d6fa5c401 144 }
fabeltranm 0:9b6d6fa5c401 145
fabeltranm 0:9b6d6fa5c401 146
fabeltranm 0:9b6d6fa5c401 147 int initialise_card() {
fabeltranm 0:9b6d6fa5c401 148 // Set to SCK for initialisation, and clock card with cs = 1
fabeltranm 0:9b6d6fa5c401 149 sd.frequency(100000);
fabeltranm 0:9b6d6fa5c401 150 ssel = 1;
fabeltranm 0:9b6d6fa5c401 151 for (int i = 0; i < 16; i++) {
fabeltranm 0:9b6d6fa5c401 152 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 153 }
fabeltranm 0:9b6d6fa5c401 154
fabeltranm 0:9b6d6fa5c401 155 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
fabeltranm 0:9b6d6fa5c401 156 if (cmd(0, 0) != R1_IDLE_STATE) {
fabeltranm 0:9b6d6fa5c401 157 debug("No disk, or could not put SD card in to SPI idle state\n");
fabeltranm 0:9b6d6fa5c401 158 return SDCARD_FAIL;
fabeltranm 0:9b6d6fa5c401 159 }
fabeltranm 0:9b6d6fa5c401 160
fabeltranm 0:9b6d6fa5c401 161 // send CMD8 to determine whther it is ver 2.x
fabeltranm 0:9b6d6fa5c401 162 int r = cmd8();
fabeltranm 0:9b6d6fa5c401 163 if (r == R1_IDLE_STATE) {
fabeltranm 0:9b6d6fa5c401 164 return initialise_card_v2();
fabeltranm 0:9b6d6fa5c401 165 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
fabeltranm 0:9b6d6fa5c401 166 return initialise_card_v1();
fabeltranm 0:9b6d6fa5c401 167 } else {
fabeltranm 0:9b6d6fa5c401 168 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
fabeltranm 0:9b6d6fa5c401 169 return SDCARD_FAIL;
fabeltranm 0:9b6d6fa5c401 170 }
fabeltranm 0:9b6d6fa5c401 171 }
fabeltranm 0:9b6d6fa5c401 172
fabeltranm 0:9b6d6fa5c401 173
fabeltranm 0:9b6d6fa5c401 174 int cmd8() {
fabeltranm 0:9b6d6fa5c401 175 ssel = 0;
fabeltranm 0:9b6d6fa5c401 176
fabeltranm 0:9b6d6fa5c401 177 // send a command
fabeltranm 0:9b6d6fa5c401 178 sd.write(0x40 | 8); // CMD8
fabeltranm 0:9b6d6fa5c401 179 sd.write(0x00); // reserved
fabeltranm 0:9b6d6fa5c401 180 sd.write(0x00); // reserved
fabeltranm 0:9b6d6fa5c401 181 sd.write(0x01); // 3.3v
fabeltranm 0:9b6d6fa5c401 182 sd.write(0xAA); // check pattern
fabeltranm 0:9b6d6fa5c401 183 sd.write(0x87); // crc
fabeltranm 0:9b6d6fa5c401 184
fabeltranm 0:9b6d6fa5c401 185 // wait for the repsonse (response[7] == 0)
fabeltranm 0:9b6d6fa5c401 186 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
fabeltranm 0:9b6d6fa5c401 187 char response[5];
fabeltranm 0:9b6d6fa5c401 188 response[0] = sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 189 if (!(response[0] & 0x80)) {
fabeltranm 0:9b6d6fa5c401 190 for (int j = 1; j < 5; j++) {
fabeltranm 0:9b6d6fa5c401 191 response[i] = sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 192 }
fabeltranm 0:9b6d6fa5c401 193 ssel = 1;
fabeltranm 0:9b6d6fa5c401 194 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 195 return response[0];
fabeltranm 0:9b6d6fa5c401 196 }
fabeltranm 0:9b6d6fa5c401 197 }
fabeltranm 0:9b6d6fa5c401 198 ssel = 1;
fabeltranm 0:9b6d6fa5c401 199 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 200 return -1; // timeout
fabeltranm 0:9b6d6fa5c401 201 }
fabeltranm 0:9b6d6fa5c401 202
fabeltranm 0:9b6d6fa5c401 203
fabeltranm 0:9b6d6fa5c401 204 int cmd58() {
fabeltranm 0:9b6d6fa5c401 205 ssel = 0;
fabeltranm 0:9b6d6fa5c401 206 int arg = 0;
fabeltranm 0:9b6d6fa5c401 207
fabeltranm 0:9b6d6fa5c401 208 // send a command
fabeltranm 0:9b6d6fa5c401 209 sd.write(0x40 | 58);
fabeltranm 0:9b6d6fa5c401 210 sd.write(arg >> 24);
fabeltranm 0:9b6d6fa5c401 211 sd.write(arg >> 16);
fabeltranm 0:9b6d6fa5c401 212 sd.write(arg >> 8);
fabeltranm 0:9b6d6fa5c401 213 sd.write(arg >> 0);
fabeltranm 0:9b6d6fa5c401 214 sd.write(0x95);
fabeltranm 0:9b6d6fa5c401 215
fabeltranm 0:9b6d6fa5c401 216 // wait for the repsonse (response[7] == 0)
fabeltranm 0:9b6d6fa5c401 217 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
fabeltranm 0:9b6d6fa5c401 218 int response = sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 219 if (!(response & 0x80)) {
fabeltranm 0:9b6d6fa5c401 220 int ocr = sd.write(0xFF) << 24;
fabeltranm 0:9b6d6fa5c401 221 ocr |= sd.write(0xFF) << 16;
fabeltranm 0:9b6d6fa5c401 222 ocr |= sd.write(0xFF) << 8;
fabeltranm 0:9b6d6fa5c401 223 ocr |= sd.write(0xFF) << 0;
fabeltranm 0:9b6d6fa5c401 224 ssel = 1;
fabeltranm 0:9b6d6fa5c401 225 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 226 return response;
fabeltranm 0:9b6d6fa5c401 227 }
fabeltranm 0:9b6d6fa5c401 228 }
fabeltranm 0:9b6d6fa5c401 229 ssel = 1;
fabeltranm 0:9b6d6fa5c401 230 sd.write(0xFF);
fabeltranm 0:9b6d6fa5c401 231 return -1; // timeout
fabeltranm 0:9b6d6fa5c401 232 }