航空研究会
h
Dependencies: FATFileSystem
Diff: SDFileSystem.cpp
- Revision:
- 0:85fbe134acff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SDFileSystem.cpp Sat Aug 26 16:30:14 2017 +0000
@@ -0,0 +1,885 @@
+/* SD/MMC File System Library
+ * Copyright (c) 2016 Neil Thiessen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "SDFileSystem.h"
+#include "diskio.h"
+#include "pinmap.h"
+#include "SDCRC.h"
+
+SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name, PinName cd, SwitchType cdtype, int hz)
+ : FATFileSystem(name),
+ m_Spi(mosi, miso, sclk),
+ m_Cs(cs, 1),
+ m_Cd(cd),
+ m_FREQ(hz)
+{
+ //Initialize the member variables
+ m_CardType = CARD_NONE;
+ m_Crc = true;
+ m_LargeFrames = false;
+ m_WriteValidation = true;
+ m_Status = STA_NOINIT;
+
+ //Enable the internal pull-up resistor on MISO
+ pin_mode(miso, PullUp);
+
+ //Configure the SPI bus
+ m_Spi.format(8, 0);
+
+ //Configure the card detect pin
+ if (cdtype == SWITCH_POS_NO) {
+ m_Cd.mode(PullDown);
+ m_CdAssert = 1;
+ m_Cd.fall(this, &SDFileSystem::onCardRemoval);
+ } else if (cdtype == SWITCH_POS_NC) {
+ m_Cd.mode(PullDown);
+ m_CdAssert = 0;
+ m_Cd.rise(this, &SDFileSystem::onCardRemoval);
+ } else if (cdtype == SWITCH_NEG_NO) {
+ m_Cd.mode(PullUp);
+ m_CdAssert = 0;
+ m_Cd.rise(this, &SDFileSystem::onCardRemoval);
+ } else if (cdtype == SWITCH_NEG_NC) {
+ m_Cd.mode(PullUp);
+ m_CdAssert = 1;
+ m_Cd.fall(this, &SDFileSystem::onCardRemoval);
+ } else {
+ m_CdAssert = -1;
+ }
+}
+
+bool SDFileSystem::card_present()
+{
+ //Check the card socket
+ checkSocket();
+
+ //Return whether or not a card is present
+ return !(m_Status & STA_NODISK);
+}
+
+SDFileSystem::CardType SDFileSystem::card_type()
+{
+ //Check the card socket
+ checkSocket();
+
+ //Return the card type
+ return m_CardType;
+}
+
+bool SDFileSystem::crc()
+{
+ //Return whether or not CRC is enabled
+ return m_Crc;
+}
+
+void SDFileSystem::crc(bool enabled)
+{
+ //Check the card socket
+ checkSocket();
+
+ //Just update the member variable if the card isn't initialized
+ if (m_Status & STA_NOINIT) {
+ m_Crc = enabled;
+ return;
+ }
+
+ //Enable or disable CRC
+ if (enabled && !m_Crc) {
+ //Send CMD59(0x00000001) to enable CRC
+ m_Crc = true;
+ commandTransaction(CMD59, 0x00000001);
+ } else if (!enabled && m_Crc) {
+ //Send CMD59(0x00000000) to disable CRC
+ commandTransaction(CMD59, 0x00000000);
+ m_Crc = false;
+ }
+}
+
+bool SDFileSystem::large_frames()
+{
+ //Return whether or not 16-bit frames are enabled
+ return m_LargeFrames;
+}
+
+void SDFileSystem::large_frames(bool enabled)
+{
+ //Set whether or not 16-bit frames are enabled
+ m_LargeFrames = enabled;
+}
+
+bool SDFileSystem::write_validation()
+{
+ //Return whether or not write validation is enabled
+ return m_WriteValidation;
+}
+
+void SDFileSystem::write_validation(bool enabled)
+{
+ //Set whether or not write validation is enabled
+ m_WriteValidation = enabled;
+}
+
+int SDFileSystem::unmount()
+{
+ //Unmount the filesystem
+ FATFileSystem::unmount();
+
+ //Change the status to not initialized, and the card type to unknown
+ m_Status |= STA_NOINIT;
+ m_CardType = CARD_UNKNOWN;
+
+ //Always succeeds
+ return 0;
+}
+
+int SDFileSystem::disk_initialize()
+{
+ char token;
+ unsigned int resp;
+
+ //Make sure there's a card in the socket before proceeding
+ checkSocket();
+ if (m_Status & STA_NODISK)
+ return m_Status;
+
+ //Make sure we're not already initialized before proceeding
+ if (!(m_Status & STA_NOINIT))
+ return m_Status;
+
+ //Set the SPI frequency to 400kHz for initialization
+ m_Spi.frequency(400000);
+
+ //Send 80 dummy clocks with /CS deasserted and DI held high
+ m_Cs = 1;
+ for (int i = 0; i < 10; i++)
+ m_Spi.write(0xFF);
+
+ //Send CMD0(0x00000000) to reset the card
+ if (commandTransaction(CMD0, 0x00000000) != 0x01) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+
+ //Send CMD59(0x00000001) to enable CRC if necessary
+ if (m_Crc) {
+ if (commandTransaction(CMD59, 0x00000001) != 0x01) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+ }
+
+ //Send CMD8(0x000001AA) to see if this is an SDCv2 card
+ if (commandTransaction(CMD8, 0x000001AA, &resp) == 0x01) {
+ //This is an SDCv2 card, get the 32-bit return value and verify the voltage range/check pattern
+ if ((resp & 0xFFF) != 0x1AA) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+
+ //Send CMD58(0x00000000) to read the OCR, and verify that the card supports 3.2-3.3V
+ if (commandTransaction(CMD58, 0x00000000, &resp) != 0x01 || !(resp & (1 << 20))) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+
+ //Try to initialize the card using ACMD41(0x00100000)
+ for (int i = 0; i < 1000; i++) {
+ token = commandTransaction(ACMD41, 0x40100000);
+ if (token != 0x01) {
+ break;
+ }
+ }
+
+ //Check if the card initialized
+ if (token != 0x00) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+
+ //Send CMD58(0x00000000) to read the OCR
+ if (commandTransaction(CMD58, 0x00000000, &resp) == 0x00) {
+ //Check the CCS bit to determine if this is a high capacity card
+ if (resp & (1 << 30))
+ m_CardType = CARD_SDHC;
+ else
+ m_CardType = CARD_SD;
+
+ //Increase the SPI frequency to full speed (up to 25MHz for SDCv2)
+ if (m_FREQ > 25000000)
+ m_Spi.frequency(25000000);
+ else
+ m_Spi.frequency(m_FREQ);
+ } else {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+ } else {
+ //Didn't respond or illegal command, this is either an SDCv1 or MMC card
+ //Send CMD58(0x00000000) to read the OCR, and verify that the card supports 3.2-3.3V
+ if (commandTransaction(CMD58, 0x00000000, &resp) != 0x01 || !(resp & (1 << 20))) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+
+ //Try to initialize the card using ACMD41(0x00100000)
+ for (int i = 0; i < 1000; i++) {
+ token = commandTransaction(ACMD41, 0x40100000);
+ if (token != 0x01) {
+ break;
+ }
+ }
+
+ //Check if the card initialized
+ if (token == 0x00) {
+ //This is an SDCv1 standard capacity card
+ m_CardType = CARD_SD;
+
+ //Increase the SPI frequency to full speed (up to 25MHz for SDCv1)
+ if (m_FREQ > 25000000)
+ m_Spi.frequency(25000000);
+ else
+ m_Spi.frequency(m_FREQ);
+ } else {
+ //Try to initialize the card using CMD1(0x00100000)
+ for (int i = 0; i < 1000; i++) {
+ token = commandTransaction(CMD1, 0x00100000);
+ if (token != 0x01) {
+ break;
+ }
+ }
+
+ //Check if the card initialized
+ if (token == 0x00) {
+ //This is an MMCv3 card
+ m_CardType = CARD_MMC;
+
+ //Increase the SPI frequency to full speed (up to 20MHz for MMCv3)
+ if (m_FREQ > 20000000)
+ m_Spi.frequency(20000000);
+ else
+ m_Spi.frequency(m_FREQ);
+ } else {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+ }
+ }
+
+ //Send ACMD42(0x00000000) to disconnect the internal pull-up resistor on pin 1 if necessary
+ if (m_CardType != CARD_MMC) {
+ if (commandTransaction(ACMD42, 0x00000000) != 0x00) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+ }
+
+ //Send CMD16(0x00000200) to force the block size to 512B if necessary
+ if (m_CardType != CARD_SDHC) {
+ if (commandTransaction(CMD16, 0x00000200) != 0x00) {
+ //Initialization failed
+ m_CardType = CARD_UNKNOWN;
+ return m_Status;
+ }
+ }
+
+ //The card is now initialized
+ m_Status &= ~STA_NOINIT;
+
+ //Return the disk status
+ return m_Status;
+}
+
+int SDFileSystem::disk_status()
+{
+ //Check the card socket
+ checkSocket();
+
+ //Return the disk status
+ return m_Status;
+}
+
+int SDFileSystem::disk_read(uint8_t* buffer, uint32_t sector, uint32_t count)
+{
+ //Make sure the card is initialized before proceeding
+ if (m_Status & STA_NOINIT)
+ return RES_NOTRDY;
+
+ //Read a single block, or multiple blocks
+ if (count > 1) {
+ return readBlocks((char*)buffer, sector, count) ? RES_OK : RES_ERROR;
+ } else {
+ return readBlock((char*)buffer, sector) ? RES_OK : RES_ERROR;
+ }
+}
+
+int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t sector, uint32_t count)
+{
+ //Make sure the card is initialized before proceeding
+ if (m_Status & STA_NOINIT)
+ return RES_NOTRDY;
+
+ //Make sure the card isn't write protected before proceeding
+ if (m_Status & STA_PROTECT)
+ return RES_WRPRT;
+
+ //Write a single block, or multiple blocks
+ if (count > 1) {
+ return writeBlocks((const char*)buffer, sector, count) ? RES_OK : RES_ERROR;
+ } else {
+ return writeBlock((const char*)buffer, sector) ? RES_OK : RES_ERROR;
+ }
+}
+
+int SDFileSystem::disk_sync()
+{
+ //Select the card so we're forced to wait for the end of any internal write processes
+ if (select()) {
+ deselect();
+ return RES_OK;
+ } else {
+ return RES_ERROR;
+ }
+}
+
+uint32_t SDFileSystem::disk_sectors()
+{
+ //Make sure the card is initialized before proceeding
+ if (m_Status & STA_NOINIT)
+ return 0;
+
+ //Try to read the CSD register up to 3 times
+ for (int f = 0; f < 3; f++) {
+ //Select the card, and wait for ready
+ if(!select())
+ break;
+
+ //Send CMD9(0x00000000) to read the CSD register
+ if (writeCommand(CMD9, 0x00000000) == 0x00) {
+ //Read the 16B CSD data block
+ char csd[16];
+ bool success = readData(csd, 16);
+ deselect();
+ if (success) {
+ //Calculate the sector count based on the card type
+ if ((csd[0] >> 6) == 0x01) {
+ //Calculate the sector count for a high capacity card
+ unsigned int size = (((csd[7] & 0x3F) << 16) | (csd[8] << 8) | csd[9]) + 1;
+ return size << 10;
+ } else {
+ //Calculate the sector count for a standard capacity card
+ unsigned int size = (((csd[6] & 0x03) << 10) | (csd[7] << 2) | ((csd[8] & 0xC0) >> 6)) + 1;
+ size <<= ((((csd[9] & 0x03) << 1) | ((csd[10] & 0x80) >> 7)) + 2);
+ size <<= (csd[5] & 0x0F);
+ return size >> 9;
+ }
+ }
+ } else {
+ //The command failed, get out
+ break;
+ }
+ }
+
+ //The read operation failed 3 times
+ deselect();
+ return 0;
+}
+
+void SDFileSystem::onCardRemoval()
+{
+ //Check the card socket
+ checkSocket();
+}
+
+inline void SDFileSystem::checkSocket()
+{
+ //Use the card detect switch (if available) to determine if the socket is occupied
+ if (m_CdAssert != -1) {
+ if (m_Status & STA_NODISK) {
+ if (m_Cd == m_CdAssert) {
+ //The socket is now occupied
+ m_Status &= ~STA_NODISK;
+ m_CardType = CARD_UNKNOWN;
+ }
+ } else {
+ if (m_Cd != m_CdAssert) {
+ //The socket is now empty
+ m_Status |= (STA_NODISK | STA_NOINIT);
+ m_CardType = CARD_NONE;
+ }
+ }
+ }
+}
+
+inline bool SDFileSystem::waitReady(int timeout)
+{
+ char resp;
+
+ //Keep sending dummy clocks with DI held high until the card releases the DO line
+ m_Timer.start();
+ do {
+ resp = m_Spi.write(0xFF);
+ } while (resp == 0x00 && m_Timer.read_ms() < timeout);
+ m_Timer.stop();
+ m_Timer.reset();
+
+ //Return success/failure
+ return (resp > 0x00);
+}
+
+inline bool SDFileSystem::select()
+{
+ //Assert /CS
+ m_Cs = 0;
+
+ //Send 8 dummy clocks with DI held high to enable DO
+ m_Spi.write(0xFF);
+
+ //Wait for up to 500ms for the card to become ready
+ if (waitReady(500)) {
+ return true;
+ } else {
+ //We timed out, deselect and return false
+ deselect();
+ return false;
+ }
+}
+
+inline void SDFileSystem::deselect()
+{
+ //Deassert /CS
+ m_Cs = 1;
+
+ //Send 8 dummy clocks with DI held high to disable DO
+ m_Spi.write(0xFF);
+}
+
+inline char SDFileSystem::commandTransaction(char cmd, unsigned int arg, unsigned int* resp)
+{
+ //Select the card, and wait for ready
+ if(!select())
+ return 0xFF;
+
+ //Perform the command transaction
+ char token = writeCommand(cmd, arg, resp);
+
+ //Deselect the card, and return the R1 response token
+ deselect();
+ return token;
+}
+
+char SDFileSystem::writeCommand(char cmd, unsigned int arg, unsigned int* resp)
+{
+ char token;
+
+ //Try to send the command up to 3 times
+ for (int f = 0; f < 3; f++) {
+ //Send CMD55(0x00000000) prior to an application specific command
+ if (cmd == ACMD22 || cmd == ACMD23 || cmd == ACMD41 || cmd == ACMD42) {
+ token = writeCommand(CMD55, 0x00000000);
+ if (token > 0x01)
+ return token;
+
+ //Deselect and reselect the card between CMD55 and an ACMD
+ deselect();
+ if(!select())
+ return 0xFF;
+ }
+
+ //Prepare the command packet
+ char cmdPacket[6];
+ cmdPacket[0] = cmd;
+ cmdPacket[1] = arg >> 24;
+ cmdPacket[2] = arg >> 16;
+ cmdPacket[3] = arg >> 8;
+ cmdPacket[4] = arg;
+ if (m_Crc || cmd == CMD0 || cmd == CMD8)
+ cmdPacket[5] = (SDCRC::crc7(cmdPacket, 5) << 1) | 0x01;
+ else
+ cmdPacket[5] = 0x01;
+
+ //Send the command packet
+ for (int i = 0; i < 6; i++)
+ m_Spi.write(cmdPacket[i]);
+
+ //Discard the stuff byte immediately following CMD12
+ if (cmd == CMD12)
+ m_Spi.write(0xFF);
+
+ //Allow up to 8 bytes of delay for the R1 response token
+ for (int i = 0; i < 9; i++) {
+ token = m_Spi.write(0xFF);
+ if (!(token & 0x80))
+ break;
+ }
+
+ //Verify the R1 response token
+ if (token == 0xFF) {
+ //No data was received, get out early
+ break;
+ } else if (token & (1 << 3)) {
+ //There was a CRC error, try again
+ continue;
+ } else if (token > 0x01) {
+ //An error occured, get out early
+ break;
+ }
+
+ //Handle R2 and R3/R7 response tokens
+ if (cmd == CMD13 && resp != NULL) {
+ //Read the R2 response value
+ *resp = m_Spi.write(0xFF);
+ } else if ((cmd == CMD8 || cmd == CMD58) && resp != NULL) {
+ //Read the R3/R7 response value
+ *resp = (m_Spi.write(0xFF) << 24);
+ *resp |= (m_Spi.write(0xFF) << 16);
+ *resp |= (m_Spi.write(0xFF) << 8);
+ *resp |= m_Spi.write(0xFF);
+ }
+
+ //The command was successful
+ break;
+ }
+
+ //Return the R1 response token
+ return token;
+}
+
+bool SDFileSystem::readData(char* buffer, int length)
+{
+ char token;
+ unsigned short crc;
+
+ //Wait for up to 500ms for a token to arrive
+ m_Timer.start();
+ do {
+ token = m_Spi.write(0xFF);
+ } while (token == 0xFF && m_Timer.read_ms() < 500);
+ m_Timer.stop();
+ m_Timer.reset();
+
+ //Check if a valid start block token was received
+ if (token != 0xFE)
+ return false;
+
+ //Check if large frames are enabled or not
+ if (m_LargeFrames) {
+ //Switch to 16-bit frames for better performance
+ m_Spi.format(16, 0);
+
+ //Read the data block into the buffer
+ unsigned short dataWord;
+ for (int i = 0; i < length; i += 2) {
+ dataWord = m_Spi.write(0xFFFF);
+ buffer[i] = dataWord >> 8;
+ buffer[i + 1] = dataWord;
+ }
+
+ //Read the CRC16 checksum for the data block
+ crc = m_Spi.write(0xFFFF);
+
+ //Switch back to 8-bit frames
+ m_Spi.format(8, 0);
+ } else {
+ //Read the data into the buffer
+ for (int i = 0; i < length; i++)
+ buffer[i] = m_Spi.write(0xFF);
+
+ //Read the CRC16 checksum for the data block
+ crc = (m_Spi.write(0xFF) << 8);
+ crc |= m_Spi.write(0xFF);
+ }
+
+ //Return the validity of the CRC16 checksum (if enabled)
+ return (!m_Crc || crc == SDCRC::crc16(buffer, length));
+}
+
+char SDFileSystem::writeData(const char* buffer, char token)
+{
+ //Calculate the CRC16 checksum for the data block (if enabled)
+ unsigned short crc = (m_Crc) ? SDCRC::crc16(buffer, 512) : 0xFFFF;
+
+ //Wait for up to 500ms for the card to become ready
+ if (!waitReady(500))
+ return false;
+
+ //Send the start block token
+ m_Spi.write(token);
+
+ //Check if large frames are enabled or not
+ if (m_LargeFrames) {
+ //Switch to 16-bit frames for better performance
+ m_Spi.format(16, 0);
+
+ //Write the data block from the buffer
+ for (int i = 0; i < 512; i += 2)
+ m_Spi.write((buffer[i] << 8) | buffer[i + 1]);
+
+ //Send the CRC16 checksum for the data block
+ m_Spi.write(crc);
+
+ //Switch back to 8-bit frames
+ m_Spi.format(8, 0);
+ } else {
+ //Write the data block from the buffer
+ for (int i = 0; i < 512; i++)
+ m_Spi.write(buffer[i]);
+
+ //Send the CRC16 checksum for the data block
+ m_Spi.write(crc >> 8);
+ m_Spi.write(crc);
+ }
+
+ //Return the data response token
+ return (m_Spi.write(0xFF) & 0x1F);
+}
+
+inline bool SDFileSystem::readBlock(char* buffer, unsigned int lba)
+{
+ //Try to read the block up to 3 times
+ for (int f = 0; f < 3; f++) {
+ //Select the card, and wait for ready
+ if(!select())
+ break;
+
+ //Send CMD17(block) to read a single block
+ if (writeCommand(CMD17, (m_CardType == CARD_SDHC) ? lba : lba << 9) == 0x00) {
+ //Try to read the block, and deselect the card
+ bool success = readData(buffer, 512);
+ deselect();
+
+ //Return if successful
+ if (success)
+ return true;
+ } else {
+ //The command failed, get out
+ break;
+ }
+ }
+
+ //The single block read failed
+ deselect();
+ return false;
+}
+
+inline bool SDFileSystem::readBlocks(char* buffer, unsigned int lba, unsigned int count)
+{
+ //Try to read each block up to 3 times
+ for (int f = 0; f < 3;) {
+ //Select the card, and wait for ready
+ if(!select())
+ break;
+
+ //Send CMD18(block) to read multiple blocks
+ if (writeCommand(CMD18, (m_CardType == CARD_SDHC) ? lba : lba << 9) == 0x00) {
+ //Try to read all of the data blocks
+ do {
+ //Read the next block, and break on errors
+ if (!readData(buffer, 512)) {
+ f++;
+ break;
+ }
+
+ //Update the variables
+ lba++;
+ buffer += 512;
+ f = 0;
+ } while (--count);
+
+ //Send CMD12(0x00000000) to stop the transmission
+ if (writeCommand(CMD12, 0x00000000) != 0x00) {
+ //The command failed, get out
+ break;
+ }
+
+ //Deselect the card, and return if successful
+ deselect();
+ if (count == 0)
+ return true;
+ } else {
+ //The command failed, get out
+ break;
+ }
+ }
+
+ //The multiple block read failed
+ deselect();
+ return false;
+}
+
+inline bool SDFileSystem::writeBlock(const char* buffer, unsigned int lba)
+{
+ //Try to write the block up to 3 times
+ for (int f = 0; f < 3; f++) {
+ //Select the card, and wait for ready
+ if(!select())
+ break;
+
+ //Send CMD24(block) to write a single block
+ if (writeCommand(CMD24, (m_CardType == CARD_SDHC) ? lba : lba << 9) == 0x00) {
+ //Try to write the block, and deselect the card
+ char token = writeData(buffer, 0xFE);
+ deselect();
+
+ //Check the data response token
+ if (token == 0x0A) {
+ //A CRC error occured, try again
+ continue;
+ } else if (token == 0x0C) {
+ //A write error occured, get out
+ break;
+ }
+
+ //Send CMD13(0x00000000) to verify that the programming was successful if enabled
+ if (m_WriteValidation) {
+ unsigned int resp;
+ if (commandTransaction(CMD13, 0x00000000, &resp) != 0x00 || resp != 0x00) {
+ //Some manner of unrecoverable write error occured during programming, get out
+ break;
+ }
+ }
+
+ //The data was written successfully
+ return true;
+ } else {
+ //The command failed, get out
+ break;
+ }
+ }
+
+ //The single block write failed
+ deselect();
+ return false;
+}
+
+inline bool SDFileSystem::writeBlocks(const char* buffer, unsigned int lba, unsigned int count)
+{
+ char token;
+ const char* currentBuffer = buffer;
+ unsigned int currentLba = lba;
+ int currentCount = count;
+
+ //Try to write each block up to 3 times
+ for (int f = 0; f < 3;) {
+ //If this is an SD card, send ACMD23(count) to set the number of blocks to pre-erase
+ if (m_CardType != CARD_MMC) {
+ if (commandTransaction(ACMD23, currentCount) != 0x00) {
+ //The command failed, get out
+ break;
+ }
+ }
+
+ //Select the card, and wait for ready
+ if(!select())
+ break;
+
+ //Send CMD25(block) to write multiple blocks
+ if (writeCommand(CMD25, (m_CardType == CARD_SDHC) ? currentLba : currentLba << 9) == 0x00) {
+ //Try to write all of the data blocks
+ do {
+ //Write the next block and break on errors
+ token = writeData(currentBuffer, 0xFC);
+ if (token != 0x05) {
+ f++;
+ break;
+ }
+
+ //Update the variables
+ currentBuffer += 512;
+ f = 0;
+ } while (--currentCount);
+
+ //Wait for up to 500ms for the card to finish processing the last block
+ if (!waitReady(500))
+ break;
+
+ //Finalize the transmission
+ if (currentCount == 0) {
+ //Send the stop tran token, and deselect the card
+ m_Spi.write(0xFD);
+ deselect();
+
+ //Send CMD13(0x00000000) to verify that the programming was successful if enabled
+ if (m_WriteValidation) {
+ unsigned int resp;
+ if (commandTransaction(CMD13, 0x00000000, &resp) != 0x00 || resp != 0x00) {
+ //Some manner of unrecoverable write error occured during programming, get out
+ break;
+ }
+ }
+
+ //The data was written successfully
+ return true;
+ } else {
+ //Send CMD12(0x00000000) to abort the transmission
+ if (writeCommand(CMD12, 0x00000000) != 0x00) {
+ //The command failed, get out
+ break;
+ }
+
+ //Deselect the card
+ deselect();
+
+ //Check the error token
+ if (token == 0x0A) {
+ //Determine the number of well written blocks if possible
+ unsigned int writtenBlocks = 0;
+ if (m_CardType != CARD_MMC && select()) {
+ //Send ACMD22(0x00000000) to get the number of well written blocks
+ if (writeCommand(ACMD22, 0x00000000) == 0x00) {
+ //Read the data
+ char acmdData[4];
+ if (readData(acmdData, 4)) {
+ //Extract the number of well written blocks
+ writtenBlocks = acmdData[0] << 24;
+ writtenBlocks |= acmdData[1] << 16;
+ writtenBlocks |= acmdData[2] << 8;
+ writtenBlocks |= acmdData[3];
+ }
+ }
+ deselect();
+ }
+
+ //Roll back the variables based on the number of well written blocks
+ currentBuffer = buffer + (writtenBlocks << 9);
+ currentLba = lba + writtenBlocks;
+ currentCount = count - writtenBlocks;
+
+ //Try again
+ continue;
+ } else {
+ //A write error occured, get out
+ break;
+ }
+ }
+ } else {
+ //The command failed, get out
+ break;
+ }
+ }
+
+ //The multiple block write failed
+ deselect();
+ return false;
+}