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sd test code
Fork of SDCardTest by
Diff: main.cpp
- Revision:
- 0:cd61eb321578
- Child:
- 1:ab8b18769cf3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Jul 15 14:46:33 2015 +0000 @@ -0,0 +1,435 @@ +#include "mbed.h" +#include "mbed_debug.h" + +#define SD_COMMAND_TIMEOUT 5000 + +#define SD_DBG 0 + +#define R1_IDLE_STATE (1 << 0) +#define R1_ERASE_RESET (1 << 1) +#define R1_ILLEGAL_COMMAND (1 << 2) +#define R1_COM_CRC_ERROR (1 << 3) +#define R1_ERASE_SEQUENCE_ERROR (1 << 4) +#define R1_ADDRESS_ERROR (1 << 5) +#define R1_PARAMETER_ERROR (1 << 6) + +int initialise_card(); +int initialise_card_v1(); +int initialise_card_v2(); +int disk_initialize(); +int disk_write(const uint8_t *, uint64_t); +int disk_read(uint8_t *, uint64_t); +int disk_erase(int,int); + +uint64_t sd_sectors(); +uint64_t sectors; + +int cmd(int, int); +int cmd58(); +int cmdx(int, int); +int cmd8(); +int read(uint8_t*, uint32_t ); +int write(const uint8_t*, uint32_t ); +static uint32_t ext_bits(unsigned char *, int , int ); + +int cdv; + +#define SDCARD_FAIL 0 +#define SDCARD_V1 1 +#define SDCARD_V2 2 +#define SDCARD_V2HC 3 + +Serial pc(USBTX,USBRX); + +SPI spi(PTD6, PTD7, PTD5); // mosi, miso, sclk +DigitalOut cs(D2); +int count; +int i; +int random[1000]; + + +int main() +{ + + initialise_card(); + int result= initialise_card(); + disk_initialize(); + uint8_t buffer[512]; + uint8_t buffer2[512]; + for(count=0; count<512; count++) + { + buffer[count]= count; + } + pc.printf("\n\rData written to SDCard is \n"); + for(count=0; count<512; count++) + { + pc.printf("%d ",buffer[count]); + } + disk_write(buffer,2); + disk_read(buffer2,2); + pc.printf("\n\rData Read from the SDCard is\r\n"); + for(count=0; count<512; count++) + { + pc.printf("%d ",buffer2[count]); + } +} + +int initialise_card() +{ + // Set to 100kHz for initialisation, and clock card with cs = 1 + spi.frequency(100000); + cs = 1; + for (int i = 0; i < 16; i++) { + spi.write(0xFF); + } + + // send CMD0, should return with all zeros except IDLE STATE set (bit 0) + if (cmd(0, 0) != R1_IDLE_STATE) { + debug("No disk, or could not put SD card in to SPI idle state\n"); + return SDCARD_FAIL; + } + +// send CMD8 to determine whther it is ver 2.x + int r = cmd8(); + if (r == R1_IDLE_STATE) { + printf("Entering v2 bro\n"); + return initialise_card_v2(); + + } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) { + printf("Entering v1 bro\n"); + return initialise_card_v1(); + + } else { + debug("Not in idle state after sending CMD8 (not an SD card?)\n"); + return SDCARD_FAIL; + } +} + +int initialise_card_v1() +{ + for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { + cmd(55, 0); + if (cmd(41, 0) == 0) { + printf("Yuppie v1 successful\n"); + cdv = 512; + debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r"); + + return SDCARD_V1; + } + } + + debug("Timeout waiting for v1.x card\n"); + return SDCARD_FAIL; +} + + +int initialise_card_v2() +{ + for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { + wait_ms(50); + cmd58(); + cmd(55, 0); + if (cmd(41, 0x40000000) == 0) { + printf("Yuppie,v2 successful\n"); + cmd58(); + debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r"); + cdv = 1; + + return SDCARD_V2; + } + } + + debug("Timeout waiting for v2.x card\n"); + return SDCARD_FAIL; +} + +int cmd(int cmd, int arg) +{ + cs = 0; + + // send a command + spi.write(0x40 | cmd); + spi.write(arg >> 24); + spi.write(arg >> 16); + spi.write(arg >> 8); + spi.write(arg >> 0); + spi.write(0x95); + + // wait for the repsonse (response[7] == 0) + for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { + int response = spi.write(0xFF); + if (!(response & 0x80)) { + cs = 1; + spi.write(0xFF); + return response; + } + } + cs = 1; + spi.write(0xFF); + return -1; // timeout +} + + +int cmd58() +{ + cs = 0; + int arg = 0; + + // send a command + spi.write(0x40 | 58); + spi.write(arg >> 24); + spi.write(arg >> 16); + spi.write(arg >> 8); + spi.write(arg >> 0); + spi.write(0x95); + + // wait for the repsonse (response[7] == 0) + for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { + int response = spi.write(0xFF); + if (!(response & 0x80)) { + int ocr = spi.write(0xFF) << 24; + ocr |= spi.write(0xFF) << 16; + ocr |= spi.write(0xFF) << 8; + ocr |= spi.write(0xFF) << 0; + cs = 1; + spi.write(0xFF); + return response; + } + } + cs = 1; + spi.write(0xFF); + return -1; // timeout +} + + +int cmd8() +{ + cs = 0; + + // send a command + spi.write(0x40 | 8); // CMD8 + spi.write(0x00); // reserved + spi.write(0x00); // reserved + spi.write(0x01); // 3.3v + spi.write(0xAA); // check pattern + spi.write(0x87); // crc + + // wait for the repsonse (response[7] == 0) + for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) { + char response[5]; + response[0] = spi.write(0xFF); + if (!(response[0] & 0x80)) { + for (int j = 1; j < 5; j++) { + response[i] = spi.write(0xFF); + } + cs = 1; + spi.write(0xFF); + return response[0]; + } + } + cs = 1; + spi.write(0xFF); + return -1; // timeout +} + +uint64_t sd_sectors() +{ + uint32_t c_size, c_size_mult, read_bl_len; + uint32_t block_len, mult, blocknr, capacity; + uint32_t hc_c_size; + uint64_t blocks; + + // CMD9, Response R2 (R1 byte + 16-byte block read) + if (cmdx(9, 0) != 0) { + debug("Didn't get a response from the disk\n"); + return 0; + } + + uint8_t csd[16]; + if (read(csd, 16) != 0) { + debug("Couldn't read csd response from disk\n"); + return 0; + } + + // csd_structure : csd[127:126] + // c_size : csd[73:62] + // c_size_mult : csd[49:47] + // read_bl_len : csd[83:80] - the *maximum* read block length + + int csd_structure = ext_bits(csd, 127, 126); + + switch (csd_structure) { + case 0: + cdv = 512; + c_size = ext_bits(csd, 73, 62); + c_size_mult = ext_bits(csd, 49, 47); + read_bl_len = ext_bits(csd, 83, 80); + + block_len = 1 << read_bl_len; + mult = 1 << (c_size_mult + 2); + blocknr = (c_size + 1) * mult; + capacity = blocknr * block_len; + blocks = capacity / 512; + debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks); + break; + + case 1: + cdv = 1; + hc_c_size = ext_bits(csd, 63, 48); + blocks = (hc_c_size+1)*1024; + 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); + break; + + default: + debug("CSD struct unsupported\r\n"); + return 0; + }; + return blocks; +} + +int cmdx(int cmd, int arg) +{ + cs = 0; + + // send a command + spi.write(0x40 | cmd); + spi.write(arg >> 24); + spi.write(arg >> 16); + spi.write(arg >> 8); + spi.write(arg >> 0); + spi.write(0x95); + + // wait for the repsonse (response[7] == 0) + for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { + int response = spi.write(0xFF); + if (!(response & 0x80)) { + return response; + } + } + cs = 1; + spi.write(0xFF); + return -1; // timeout +} + +static uint32_t ext_bits(unsigned char *data, int msb, int lsb) +{ + uint32_t bits = 0; + uint32_t size = 1 + msb - lsb; + for (int i = 0; i < size; i++) { + uint32_t position = lsb + i; + uint32_t byte = 15 - (position >> 3); + uint32_t bit = position & 0x7; + uint32_t value = (data[byte] >> bit) & 1; + bits |= value << i; + } + return bits; +} + +int disk_initialize() +{ + int i = initialise_card(); + debug_if(SD_DBG, "init card = %d\n", i); + sectors = sd_sectors(); + + // Set block length to 512 (CMD16) + if (cmd(16, 512) != 0) { + debug("Set 512-byte block timed out\n"); + return 1; + } else { + printf("Hey,block init succesful\n"); + } + + spi.frequency(1000000); // Set to 1MHz for data transfer + return 0; +} + +int disk_write(const uint8_t *buffer, uint64_t block_number) + +{ + // set write address for single block (CMD24) + if (cmd(24, block_number * cdv) != 0) { + return 1; + } + + // send the data block + write(buffer, 512); + //printf("Written Successfully bro \n"); + return 0; +} + +int write(const uint8_t*buffer, uint32_t length) +{ + cs = 0; + + // indicate start of block + spi.write(0xFE); + + // write the data + for (int i = 0; i < length; i++) { + spi.write(buffer[i]); + } + + // write the checksum + spi.write(0xFF); + spi.write(0xFF); + + // check the response token + if ((spi.write(0xFF) & 0x1F) != 0x05) { + cs = 1; + spi.write(0xFF); + return 1; + } + + // wait for write to finish + while (spi.write(0xFF) == 0); + + cs = 1; + spi.write(0xFF); + return 0; +} + +int disk_read(uint8_t *buffer, uint64_t block_number) +{ + // set read address for single block (CMD17) + if (cmd(17, block_number * cdv) != 0) { + return 1; + } + + // receive the data + read(buffer, 512); + return 0; +} + +int read(uint8_t *buffer, uint32_t length) +{ + cs = 0; + + // read until start byte (0xFF) + while (spi.write(0xFF) != 0xFE); + + // read data + for (int i = 0; i < length; i++) { + buffer[i] = spi.write(0xFF); + } + spi.write(0xFF); // checksum + spi.write(0xFF); + + cs = 1; + spi.write(0xFF); + return 0; +} + +int disk_erase(int startBlock, int totalBlocks) +{ + if(cmd(32, startBlock * cdv) != 0) { + return 1; + } + if (cmd(33, (startBlock+totalBlocks-1) * cdv) != 0) { + return 1; + } + if (cmd(38,0) != 0) { + return 1; + } + + return 0; //normal return +}