Diff: SDFileSystem.cpp

Revision:

4:3f40cbfe801c

Parent:

3:7b35d1709458

--- a/SDFileSystem.cpp	Mon Mar 17 14:34:01 2014 +0000
+++ b/SDFileSystem.cpp	Wed Aug 24 02:51:06 2016 +0000
@@ -19,7 +19,6 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-
 /* Introduction
  * ------------
  * SD and MMC cards support a number of interfaces, but common to them all
@@ -121,8 +120,12 @@
 #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), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
     _cs = 1;
+
+    // Set default to 100kHz for initialisation and 1MHz for data transfer
+    _init_sck = 100000;
+    _transfer_sck = 1000000;
 }
 
 #define R1_IDLE_STATE           (1 << 0)
@@ -134,25 +137,29 @@
 #define R1_PARAMETER_ERROR      (1 << 6)
 
 // Types
-#define SDCARD_FAIL 0 //!< v1.x Standard Capacity
-#define SDCARD_V1   1 //!< v2.x Standard Capacity
-#define SDCARD_V2   2 //!< v2.x High Capacity
-#define SDCARD_V2HC 3 //!< Not recognised as an SD Card
+//  - v1.x Standard Capacity
+//  - v2.x Standard Capacity
+//  - v2.x High Capacity
+//  - Not recognised as an SD Card
+#define SDCARD_FAIL 0
+#define SDCARD_V1   1
+#define SDCARD_V2   2
+#define SDCARD_V2HC 3
 
 int SDFileSystem::initialise_card() {
-    // Set to 100kHz for initialisation, and clock card with cs = 1
-    _spi.frequency(100000);
+    // Set to SCK for initialisation, and clock card with cs = 1
+    _spi.frequency(_init_sck);
     _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) {
@@ -174,7 +181,7 @@
             return SDCARD_V1;
         }
     }
-    
+
     debug("Timeout waiting for v1.x card\n");
     return SDCARD_FAIL;
 }
@@ -191,57 +198,86 @@
             return SDCARD_V2;
         }
     }
-    
+
     debug("Timeout waiting for v2.x card\n");
     return SDCARD_FAIL;
 }
 
 int SDFileSystem::disk_initialize() {
-    int i = initialise_card();
-    debug_if(SD_DBG, "init card = %d\n", i);
+    _is_initialized = initialise_card();
+    if (_is_initialized == 0) {
+        debug("Fail to initialize card\n");
+        return 1;
+    }
+    debug_if(SD_DBG, "init card = %d\n", _is_initialized);
     _sectors = _sd_sectors();
-    
+
     // Set block length to 512 (CMD16)
     if (_cmd(16, 512) != 0) {
         debug("Set 512-byte block timed out\n");
         return 1;
     }
+
+    // Set SCK for data transfer
+    _spi.frequency(_transfer_sck);
+    return 0;
+}
+
+int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
+    if (!_is_initialized) {
+        return -1;
+    }
     
-    _spi.frequency(1000000); // Set to 1MHz for data transfer
+    for (uint32_t b = block_number; b < block_number + count; b++) {
+        // set write address for single block (CMD24)
+        if (_cmd(24, b * cdv) != 0) {
+            return 1;
+        }
+        
+        // send the data block
+        _write(buffer, 512);
+        buffer += 512;
+    }
+    
     return 0;
 }
 
-int SDFileSystem::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;
+int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
+    if (!_is_initialized) {
+        return -1;
     }
     
-    // send the data block
-    _write(buffer, 512);
+    for (uint32_t b = block_number; b < block_number + count; b++) {
+        // set read address for single block (CMD17)
+        if (_cmd(17, b * cdv) != 0) {
+            return 1;
+        }
+        
+        // receive the data
+        _read(buffer, 512);
+        buffer += 512;
+    }
+
     return 0;
 }
 
-int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
-    // set read address for single block (CMD17)
-    if (_cmd(17, block_number * cdv) != 0) {
+int SDFileSystem::disk_status() {
+    // FATFileSystem::disk_status() returns 0 when initialized
+    if (_is_initialized) {
+        return 0;
+    } else {
         return 1;
     }
-    
-    // receive the data
-    _read(buffer, 512);
-    return 0;
 }
 
-int SDFileSystem::disk_status() { return 0; }
 int SDFileSystem::disk_sync() { return 0; }
-uint64_t SDFileSystem::disk_sectors() { return _sectors; }
+uint32_t SDFileSystem::disk_sectors() { return _sectors; }
 
 
 // PRIVATE FUNCTIONS
 int SDFileSystem::_cmd(int cmd, int arg) {
     _cs = 0;
-    
+
     // send a command
     _spi.write(0x40 | cmd);
     _spi.write(arg >> 24);
@@ -249,7 +285,7 @@
     _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);
@@ -265,7 +301,7 @@
 }
 int SDFileSystem::_cmdx(int cmd, int arg) {
     _cs = 0;
-    
+
     // send a command
     _spi.write(0x40 | cmd);
     _spi.write(arg >> 24);
@@ -273,7 +309,7 @@
     _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);
@@ -290,7 +326,7 @@
 int SDFileSystem::_cmd58() {
     _cs = 0;
     int arg = 0;
-    
+
     // send a command
     _spi.write(0x40 | 58);
     _spi.write(arg >> 24);
@@ -298,7 +334,7 @@
     _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);
@@ -319,7 +355,7 @@
 
 int SDFileSystem::_cmd8() {
     _cs = 0;
-    
+
     // send a command
     _spi.write(0x40 | 8); // CMD8
     _spi.write(0x00);     // reserved
@@ -327,7 +363,7 @@
     _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];
@@ -348,17 +384,17 @@
 
 int SDFileSystem::_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++) {
+    for (uint32_t i = 0; i < length; i++) {
         buffer[i] = _spi.write(0xFF);
     }
     _spi.write(0xFF); // checksum
     _spi.write(0xFF);
-    
+
     _cs = 1;
     _spi.write(0xFF);
     return 0;
@@ -366,29 +402,29 @@
 
 int SDFileSystem::_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++) {
+    for (uint32_t 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;
@@ -397,7 +433,7 @@
 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++) {
+    for (uint32_t i = 0; i < size; i++) {
         uint32_t position = lsb + i;
         uint32_t byte = 15 - (position >> 3);
         uint32_t bit = position & 0x7;
@@ -407,38 +443,38 @@
     return bits;
 }
 
-uint64_t SDFileSystem::_sd_sectors() {
+uint32_t SDFileSystem::_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;
-    
+    uint32_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;
@@ -446,17 +482,17 @@
             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;
-}
+}
\ No newline at end of file