changes for speed up.
Dependents: nlgplay nlgplay_130
Fork of SDFileSystem by
Diff: SDFileSystem.cpp
- Revision:
- 7:3701e9942a16
- Parent:
- 4:e6b0a24df912
--- a/SDFileSystem.cpp Wed Aug 20 00:29:53 2014 +0000 +++ b/SDFileSystem.cpp Mon Feb 08 05:49:06 2016 +0000 @@ -117,14 +117,16 @@ #include "mbed_debug.h" // SD card data clock speed (def. 1000000) -#define SD_SPEED 8000000 +#define SD_SPEED 12000000 +//#define SD_SPEED 24000000 #define SD_COMMAND_TIMEOUT 5000 #define SD_DBG 0 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) : - FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) { + FATFileSystem(name), _cs(cs) { + _spi = new SPI(mosi, miso, sclk), _cs = 1; } @@ -142,20 +144,25 @@ #define SDCARD_V2 2 //!< v2.x High Capacity #define SDCARD_V2HC 3 //!< Not recognised as an SD Card +SPI *SDFileSystem::getSPI(void) +{ + return _spi; +} + int SDFileSystem::initialise_card() { // Set to 100kHz for initialisation, and clock card with cs = 1 - _spi.frequency(100000); + _spi->frequency(100000); _cs = 1; for (int i = 0; i < 16; i++) { - _spi.write(0xFF); + _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) { @@ -177,7 +184,7 @@ return SDCARD_V1; } } - + debug("Timeout waiting for v1.x card\n"); return SDCARD_FAIL; } @@ -194,7 +201,7 @@ return SDCARD_V2; } } - + debug("Timeout waiting for v2.x card\n"); return SDCARD_FAIL; } @@ -203,14 +210,14 @@ 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; } - - _spi.frequency(SD_SPEED); // Set to 1MHz for data transfer + + _spi->frequency(SD_SPEED); // Set to 1MHz for data transfer return 0; } @@ -219,7 +226,7 @@ if (_cmd(24, block_number * cdv) != 0) { return 1; } - + // send the data block _write(buffer, 512); return 0; @@ -230,7 +237,7 @@ if (_cmd(17, block_number * cdv) != 0) { return 1; } - + // receive the data _read(buffer, 512); return 0; @@ -244,48 +251,48 @@ // PRIVATE FUNCTIONS int SDFileSystem::_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); - + _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); + int response = _spi->write(0xFF); if (!(response & 0x80)) { _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return response; } } _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return -1; // timeout } int SDFileSystem::_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); - + _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); + int response = _spi->write(0xFF); if (!(response & 0x80)) { return response; } } _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return -1; // timeout } @@ -293,107 +300,107 @@ int SDFileSystem::_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); - + _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); + 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; + 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); + _spi->write(0xFF); return response; } } _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return -1; // timeout } int SDFileSystem::_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 - + _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); + response[0] = _spi->write(0xFF); if (!(response[0] & 0x80)) { for (int j = 1; j < 5; j++) { - response[i] = _spi.write(0xFF); + response[i] = _spi->write(0xFF); } _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return response[0]; } } _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return -1; // timeout } int SDFileSystem::_read(uint8_t *buffer, uint32_t length) { _cs = 0; - + // read until start byte (0xFF) - while (_spi.write(0xFF) != 0xFE); - + while (_spi->write(0xFF) != 0xFE); + // read data for (int i = 0; i < length; i++) { - buffer[i] = _spi.write(0xFF); + buffer[i] = _spi->write(0xFF); } - _spi.write(0xFF); // checksum - _spi.write(0xFF); - + _spi->write(0xFF); // checksum + _spi->write(0xFF); + _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return 0; } int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) { _cs = 0; - + // indicate start of block - _spi.write(0xFE); - + _spi->write(0xFE); + // write the data for (int i = 0; i < length; i++) { - _spi.write(buffer[i]); + _spi->write(buffer[i]); } - + // write the checksum - _spi.write(0xFF); - _spi.write(0xFF); - + _spi->write(0xFF); + _spi->write(0xFF); + // check the response token - if ((_spi.write(0xFF) & 0x1F) != 0x05) { + if ((_spi->write(0xFF) & 0x1F) != 0x05) { _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return 1; } - + // wait for write to finish - while (_spi.write(0xFF) == 0); - + while (_spi->write(0xFF) == 0); + _cs = 1; - _spi.write(0xFF); + _spi->write(0xFF); return 0; } @@ -415,33 +422,33 @@ 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; @@ -449,14 +456,14 @@ 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;