vr1.1
Dependencies: FreescaleIAP mbed-rtos mbed
Fork of CDMS_RTOS_v1_1 by
SDCard.cpp
- Committer:
- cholletisaik777
- Date:
- 2015-07-17
- Revision:
- 16:7428828a5da2
- Parent:
- 15:2c8629da6ec9
File content as of revision 16:7428828a5da2:
#include "mbed.h" #include "mbed_debug.h" #include "SDCard.h" #include "all_funcs.h" #include "Flags.h" #include "pin_config.h" SPI spi_SD(PIN2, PIN1, PIN3); // mosi, miso, sclk DigitalOut cs_SD(PIN20); void FCTN_INIT_SD() { uint8_t sd_init_fail_count = 0; uint8_t sd_disk_init_fail_count = 0; all_flags = all_flags|SDCARD_INIT_STATUS; int sd_response = initialise_card(); while(sd_response == 1) { sd_init_fail_count++; sd_response = initialise_card(); if(sd_init_fail_count>3) { all_flags = all_flags|SDCARD_INIT_FAIL; printf("\rSDCard init failed\r\n"); break; } } sd_response = disk_initialize(); while(sd_response == 1) { sd_disk_init_fail_count++; sd_response = disk_initialize(); if(sd_disk_init_fail_count>3) { all_flags = all_flags|SDCARD_DISK_FAIL; printf("\rSDCard disk init failed\r\n"); break; } } if(sd_disk_init_fail_count<=3 && sd_init_fail_count<=3 ) { printf("\rSDCard successfully initialized\r\n"); } all_flags = all_flags&(~SDCARD_INIT_STATUS); } int FCTN_RD_SD(uint8_t *buffer, uint64_t block_number) { all_flags = all_flags|SD_RD_STATUS; // set read address for single block (CMD17) if (cmd(17, block_number * cdv) != 0) { all_flags = all_flags|SD_RD_FAIL; printf("\rReading from SDCard failed\r\n"); return 1; } // receive the data read(buffer, 512); all_flags = all_flags&(~SD_RD_STATUS); printf("Read Successfully from SDCard\r\n"); return 0; } int FCTN_WR_SD(const uint8_t *buffer, uint64_t block_number) { all_flags = all_flags|SD_WR_STATUS; // set write address for single block (CMD24) if (cmd(24, block_number * cdv) != 0) { all_flags = all_flags|SD_WR_FAIL; printf("\rWriting to SDCard Failed\r\n"); return 1; } // send the data block write(buffer, 512); all_flags = all_flags&(~SD_WR_STATUS); printf("Written Successfully to SDCard\r\n"); return 0; } int initialise_card() { // Set to 100kHz for initialisation, and clock card with cs_SD = 1 spi_SD.frequency(100000); cs_SD = 1; for (int i = 0; i < 16; i++) { spi_SD.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\r\n"); return 1; } // send CMD8 to determine whther it is ver 2.x int r = cmd8(); if (r == R1_IDLE_STATE) { printf("Entering version2\r\n"); return initialise_card_v2(); } else { debug("Not in idle state after sending CMD8 (not an SD card?)\r\n"); return 1; } } 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\r\n"); cmd58(); debug_if(SD_DBG, "\r\n\rInit: SDCARD_V2\r\n\r"); cdv = 1; return 0; } } debug("Timeout waiting for v2.x card\r\n"); return 1; } int disk_initialize() { int i = initialise_card(); debug_if(SD_DBG, "init card = %d\r\n", i); sectors = sd_sectors(); // Set block length to 512 (CMD16) if (cmd(16, 512) != 0) { debug("Set 512-byte block timed out\r\n"); return 1; } else { printf("Hey,block init succesful\r\n"); } spi_SD.frequency(1000000); // Set to 1MHz for data transfer return 0; } int cmd(int cmd, int arg) { cs_SD = 0; // send a command spi_SD.write(0x40 | cmd); spi_SD.write(arg >> 24); spi_SD.write(arg >> 16); spi_SD.write(arg >> 8); spi_SD.write(arg >> 0); spi_SD.write(0x95); // wait for the repsonse (response[7] == 0) for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { int response = spi_SD.write(0xFF); if (!(response & 0x80)) { cs_SD = 1; spi_SD.write(0xFF); return response; } } cs_SD = 1; spi_SD.write(0xFF); return -1; // timeout } int cmd58() { cs_SD = 0; int arg = 0; // send a command spi_SD.write(0x40 | 58); spi_SD.write(arg >> 24); spi_SD.write(arg >> 16); spi_SD.write(arg >> 8); spi_SD.write(arg >> 0); spi_SD.write(0x95); // wait for the repsonse (response[7] == 0) for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { int response = spi_SD.write(0xFF); if (!(response & 0x80)) { int ocr = spi_SD.write(0xFF) << 24; ocr |= spi_SD.write(0xFF) << 16; ocr |= spi_SD.write(0xFF) << 8; ocr |= spi_SD.write(0xFF) << 0; cs_SD = 1; spi_SD.write(0xFF); return response; } } cs_SD = 1; spi_SD.write(0xFF); return -1; // timeout } int cmd8() { cs_SD = 0; // send a command spi_SD.write(0x40 | 8); // CMD8 spi_SD.write(0x00); // reserved spi_SD.write(0x00); // reserved spi_SD.write(0x01); // 3.3v spi_SD.write(0xAA); // check pattern spi_SD.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_SD.write(0xFF); if (!(response[0] & 0x80)) { for (int j = 1; j < 5; j++) { response[i] = spi_SD.write(0xFF); } cs_SD = 1; spi_SD.write(0xFF); return response[0]; } } cs_SD = 1; spi_SD.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\r\n"); return 0; } uint8_t csd[16]; if (read(csd, 16) != 0) { debug("Couldn't read csd response from disk\r\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, "\r\n\rSDCard\r\n\rc_size: %d \r\n\rcapacity: %ld \r\n\rsectors: %lld\r\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, "\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); break; default: debug("CSD struct unsupported\r\r\n"); return 0; }; return blocks; } int cmdx(int cmd, int arg) { cs_SD = 0; // send a command spi_SD.write(0x40 | cmd); spi_SD.write(arg >> 24); spi_SD.write(arg >> 16); spi_SD.write(arg >> 8); spi_SD.write(arg >> 0); spi_SD.write(0x95); // wait for the repsonse (response[7] == 0) for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { int response = spi_SD.write(0xFF); if (!(response & 0x80)) { return response; } } cs_SD = 1; spi_SD.write(0xFF); return -1; // timeout } int read(uint8_t *buffer, uint32_t length) { cs_SD = 0; // read until start byte (0xFF) while (spi_SD.write(0xFF) != 0xFE); // read data for (int i = 0; i < length; i++) { buffer[i] = spi_SD.write(0xFF); } spi_SD.write(0xFF); // checksum spi_SD.write(0xFF); cs_SD = 1; spi_SD.write(0xFF); return 0; } 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 write(const uint8_t*buffer, uint32_t length) { cs_SD = 0; // indicate start of block spi_SD.write(0xFE); // write the data for (int i = 0; i < length; i++) { spi_SD.write(buffer[i]); } // write the checksum spi_SD.write(0xFF); spi_SD.write(0xFF); // check the response token if ((spi_SD.write(0xFF) & 0x1F) != 0x05) { cs_SD = 1; spi_SD.write(0xFF); return 1; } // wait for write to finish while (spi_SD.write(0xFF) == 0); cs_SD = 1; spi_SD.write(0xFF); return 0; }