Revision 23:c03ef1abef0e, committed 2016-03-31

Comitter:

DieterGraef

Date:

Thu Mar 31 17:39:48 2016 +0000

Parent:

22:3fa5eaf48e81

Child:

24:698affe9560c

Commit message:

For use with STM32F746NG Discovery with SDMMC 4Bit Bus on fixed Pins

Changed in this revision

--- a/SDFileSystem.cpp	Wed Feb 24 17:46:31 2016 +0000
+++ b/SDFileSystem.cpp	Thu Mar 31 17:39:48 2016 +0000
@@ -1,6 +1,6 @@
 /* SD/MMC File System Library
  * Copyright (c) 2016 Neil Thiessen
- *
+ * Modified for the use with STM32F746 Discovery (C) 2016 Dieter Greaf
  * 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
@@ -16,49 +16,39 @@
 
 #include "SDFileSystem.h"
 #include "diskio.h"
-#include "pinmap.h"
 #include "SDCRC.h"
+//for cache flush function
+#include "SD_Helper.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)
+SDFileSystem::SDFileSystem( const char* name)
+    : FATFileSystem(name), m_Cd(PC_13)
 {
     //Initialize the member variables
+    uint8_t initstat;
+    void* h;
     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;
-    }
+    m_Cd.mode(PullUp);
+    m_CdAssert = 0;
+    m_Cd.rise(this, &SDFileSystem::onCardRemoval);
+    h=(void*)&SDFileSystem::DMA2_Stream3_IRQHandler;
+    NVIC_SetVector(DMA2_Stream3_IRQn,(uint32_t)h);
+    h=(void*)&SDFileSystem::DMA2_Stream6_IRQHandler;
+    NVIC_SetVector(DMA2_Stream6_IRQn,(uint32_t)h);
+    h=(void*)&SDFileSystem::SDMMC1_IRQHandler;
+    NVIC_SetVector(SDMMC1_IRQn,(uint32_t)h);
+    initstat=BSP_SD_Init();
+   if (initstat!=MSD_OK)
+   {
+       m_Status |= STA_NOINIT;
+   }
+   else
+   {
+        m_Status &= ~STA_NOINIT;
+   }
 }
 
 bool SDFileSystem::card_present()
@@ -100,10 +90,10 @@
     if (enabled && !m_Crc) {
         //Send CMD59(0x00000001) to enable CRC
         m_Crc = true;
-        commandTransaction(CMD59, 0x00000001);
+        BSP_SD_CommandTransaction(CMD59, 0x00000001);
     } else if (!enabled && m_Crc) {
-        //Send CMD59(0x00000000) to disable CRC
-        commandTransaction(CMD59, 0x00000000);
+        //Send CMD59(0x00000000) to disableAPP/MBED/targets/hal/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG CRC
+        BSP_SD_CommandTransaction(CMD59, 0x00000000);
         m_Crc = false;
     }
 }
@@ -147,163 +137,43 @@
 
 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;
+   BSP_SD_GetCardInfo(&m_CardInfo);
 
-            //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;
-        }
-    }
-
+   switch(m_CardInfo.CardType)
+   {
+   case STD_CAPACITY_SD_CARD_V1_1:
+       { m_CardType =  CARD_SD;
+         break; }
+    case STD_CAPACITY_SD_CARD_V2_0:
+       { m_CardType =  CARD_SD;
+         break; }
+    case HIGH_CAPACITY_SD_CARD:
+       { m_CardType =  CARD_SDHC;
+         break; }
+    case MULTIMEDIA_CARD:
+       { m_CardType =  CARD_MMC;
+         break; }
+    case SECURE_DIGITAL_IO_CARD:
+       { m_CardType =  CARD_SD;
+         break; }
+    case HIGH_SPEED_MULTIMEDIA_CARD:
+       { m_CardType =  CARD_MMC;
+         break; }
+    case SECURE_DIGITAL_IO_COMBO_CARD:
+       { m_CardType =  CARD_SD;
+         break; }
+    case HIGH_CAPACITY_MMC_CARD:
+       { m_CardType =  CARD_MMC;
+         break; }
+    default:
+       {m_CardType = CARD_UNKNOWN;
+       return m_Status;}
+   }
     //The card is now initialized
     m_Status &= ~STA_NOINIT;
 
@@ -322,20 +192,30 @@
 
 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t sector, uint32_t count)
 {
+    int retval;
     //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;
+        BSP_SD_Set_RX_Busy();
+        retval=BSP_SD_ReadBlocks_DMA((uint32_t *)buffer, (uint64_t) (sector * 512),512, count);
+        while(BSP_SD_Get_RX_busy()==1){;}
+        CPU_CACHE_Flush((uint32_t *)buffer,(512*count));
+        return (retval ? RES_ERROR : RES_OK);
     } else {
-        return readBlock((char*)buffer, sector) ? RES_OK : RES_ERROR;
+        BSP_SD_Set_RX_Busy();
+        retval= BSP_SD_ReadBlocks_DMA((uint32_t *)buffer, (uint64_t) (sector * 512), 512, 1);
+        while(BSP_SD_Get_RX_busy()==1){;}
+        CPU_CACHE_Flush((uint32_t *)buffer,(512));
+        return (retval ? RES_ERROR : RES_OK);
     }
 }
 
 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t sector, uint32_t count)
 {
+    int retval;
     //Make sure the card is initialized before proceeding
     if (m_Status & STA_NOINIT)
         return RES_NOTRDY;
@@ -346,17 +226,27 @@
 
     //Write a single block, or multiple blocks
     if (count > 1) {
-        return writeBlocks((const char*)buffer, sector, count) ? RES_OK : RES_ERROR;
+        CPU_CACHE_Flush((uint32_t *)buffer,(512*count));
+        BSP_SD_Set_TX_Busy();
+        retval= BSP_SD_WriteBlocks_DMA((uint32_t *)buffer, (uint64_t) (sector * 512), 512, count);
+         while(BSP_SD_Get_TX_busy()==1){;}
+         return (retval? RES_ERROR : RES_OK);
     } else {
-        return writeBlock((const char*)buffer, sector) ? RES_OK : RES_ERROR;
+        CPU_CACHE_Flush((uint32_t *)buffer,(512));
+        BSP_SD_Set_TX_Busy();
+        retval= BSP_SD_WriteBlocks_DMA((uint32_t *)buffer, (uint64_t) (sector * 512), 512, 1);
+         while(BSP_SD_Get_TX_busy()==1){;}
+         return (retval? RES_ERROR : RES_OK);
+
     }
 }
 
 int SDFileSystem::disk_sync()
 {
     //Select the card so we're forced to wait for the end of any internal write processes
-    if (select()) {
-        deselect();
+    while(BSP_SD_GetStatus()==SD_TRANSFER_BUSY){;}
+    if(BSP_SD_GetStatus()==SD_TRANSFER_OK)
+    {
         return RES_OK;
     } else {
         return RES_ERROR;
@@ -365,45 +255,13 @@
 
 uint32_t SDFileSystem::disk_sectors()
 {
+    uint32_t sectors=0;
     //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;
+   BSP_SD_GetCardInfo(&m_CardInfo);
+   sectors=m_CardInfo.CardCapacity>>9;
+    return sectors;
 }
 
 void SDFileSystem::onCardRemoval()
@@ -432,454 +290,39 @@
     }
 }
 
-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)
+/*interrupthandlers */
+/**
+  * @brief  This function handles DMA2 Stream 3 interrupt request.
+  * @param  None
+  * @retval None
+  */
+void SDFileSystem::DMA2_Stream3_IRQHandler(void)
 {
-    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);
+  BSP_SD_DMA_Rx_IRQHandler();
+  BSP_SD_Clear_RX_Busy();
 }
 
-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)
+/**
+  * @brief  This function handles DMA2 Stream 6 interrupt request.
+  * @param  None
+  * @retval None
+  */
+void SDFileSystem::DMA2_Stream6_IRQHandler(void)
 {
-    //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;
+  BSP_SD_DMA_Tx_IRQHandler();
+  BSP_SD_Clear_TX_Busy();
 }
 
-inline bool SDFileSystem::writeBlock(const char* buffer, unsigned int lba)
+/**
+  * @brief  This function handles SDIO interrupt request.
+  * @param  None
+  * @retval None
+  */
+void SDFileSystem::SDMMC1_IRQHandler(void)
 {
-    //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;
+  BSP_SD_IRQHandler();
 }
 
-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;
-}

--- a/SDFileSystem.h	Wed Feb 24 17:46:31 2016 +0000
+++ b/SDFileSystem.h	Thu Mar 31 17:39:48 2016 +0000
@@ -1,6 +1,6 @@
 /* SD/MMC File System Library
  * Copyright (c) 2016 Neil Thiessen
- *
+ * Modified for the use with STM32F746 Discovery (C) 2016 Dieter Greaf
  * 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
@@ -18,6 +18,7 @@
 #define SD_FILE_SYSTEM_H
 
 #include "mbed.h"
+#include "stm32746g_discovery_sd.h"
 #include "FATFileSystem.h"
 
 /** SDFileSystem class.
@@ -29,7 +30,7 @@
  * #include "SDFileSystem.h"
  *
  * //Create an SDFileSystem object
- * SDFileSystem sd(p5, p6, p7, p20, "sd");
+ * SDFileSystem sd("sd");
  *
  * int main()
  * {
@@ -65,7 +66,11 @@
  *     sd.unmount();
  * }
  * @endcode
+
  */
+ #define CMD59  (0x40 | 59)
+using namespace mbed;
+
 class SDFileSystem : public FATFileSystem
 {
 public:
@@ -100,7 +105,7 @@
      * @param cdtype The type of card detect switch.
      * @param hz The SPI bus frequency (defaults to 1MHz).
      */
-    SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name, PinName cd = NC, SwitchType cdtype = SWITCH_NONE, int hz = 1000000);
+    SDFileSystem( const char* name);
 
     /** Determine whether or not a card is present
      *
@@ -169,55 +174,21 @@
     virtual uint32_t disk_sectors();
 
 private:
-    //Commands
-    enum Command {
-        CMD0 = (0x40 | 0),      /**< GO_IDLE_STATE */
-        CMD1 = (0x40 | 1),      /**< SEND_OP_COND */
-        CMD8 = (0x40 | 8),      /**< SEND_IF_COND */
-        CMD9 = (0x40 | 9),      /**< SEND_CSD */
-        CMD12 = (0x40 | 12),    /**< STOP_TRANSMISSION */
-        CMD13 = (0x40 | 13),    /**< SEND_STATUS */
-        CMD16 = (0x40 | 16),    /**< SET_BLOCKLEN */
-        CMD17 = (0x40 | 17),    /**< READ_SINGLE_BLOCK */
-        CMD18 = (0x40 | 18),    /**< READ_MULTIPLE_BLOCK */
-        ACMD22 = (0x40 | 22),   /**< SEND_NUM_WR_BLOCKS */
-        ACMD23 = (0x40 | 23),   /**< SET_WR_BLK_ERASE_COUNT */
-        CMD24 = (0x40 | 24),    /**< WRITE_BLOCK */
-        CMD25 = (0x40 | 25),    /**< WRITE_MULTIPLE_BLOCK */
-        ACMD41 = (0x40 | 41),   /**< SD_SEND_OP_COND */
-        ACMD42 = (0x40 | 42),   /**< SET_CLR_CARD_DETECT */
-        CMD55 = (0x40 | 55),    /**< APP_CMD */
-        CMD58 = (0x40 | 58),    /**< READ_OCR */
-        CMD59 = (0x40 | 59)     /**< CRC_ON_OFF */
-    };
-
-    //Member variables
     Timer m_Timer;
-    SPI m_Spi;
-    DigitalOut m_Cs;
     InterruptIn m_Cd;
     int m_CdAssert;
-    const int m_FREQ;
     SDFileSystem::CardType m_CardType;
     bool m_Crc;
     bool m_LargeFrames;
     bool m_WriteValidation;
     int m_Status;
-
+    HAL_SD_CardInfoTypedef m_CardInfo;
     //Internal methods
     void onCardRemoval();
     void checkSocket();
-    bool waitReady(int timeout);
-    bool select();
-    void deselect();
-    char commandTransaction(char cmd, unsigned int arg, unsigned int* resp = NULL);
-    char writeCommand(char cmd, unsigned int arg, unsigned int* resp = NULL);
-    bool readData(char* buffer, int length);
-    char writeData(const char* buffer, char token);
-    bool readBlock(char* buffer, unsigned int lba);
-    bool readBlocks(char* buffer, unsigned int lba, unsigned int count);
-    bool writeBlock(const char* buffer, unsigned int lba);
-    bool writeBlocks(const char* buffer, unsigned int lba, unsigned int count);
+    void DMA2_Stream3_IRQHandler();
+    void DMA2_Stream6_IRQHandler();
+    void SDMMC1_IRQHandler();
 };
 
 #endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SD_Helper.c	Thu Mar 31 17:39:48 2016 +0000
@@ -0,0 +1,126 @@
+#include "SD_Helper.h"
+#include "stm32746g_discovery_sd.h"
+
+#define _CCSIDR_LSSHIFT(x)  (((x) & SCB_CCSIDR_LINESIZE_Msk) >> SCB_CCSIDR_LINESIZE_Pos)
+
+static SD_HandleTypeDef uSdHandle;
+static int RX_Busy;
+static int TX_Busy;
+
+
+
+
+/* cache flush */
+void CPU_CACHE_Flush(uint32_t * buffer, uint32_t length)
+{
+ // SCB_InvalidateDCache_by_Addr(buffer,length);
+  uint32_t ccsidr;
+  uint32_t smask;
+  uint32_t sshift;
+  uint32_t ways;
+  uint32_t wshift;
+  uint32_t ssize;
+  uint32_t sets;
+  uint32_t sw;
+  uint32_t start;
+  uint32_t ende;
+
+  start=(uint32_t)buffer;
+  ende=start+length;
+  /* Get the characteristics of the D-Cache */
+
+  ccsidr = SCB->CCSIDR;
+  smask  = CCSIDR_SETS(ccsidr);          /* (Number of sets) - 1 */
+  sshift = _CCSIDR_LSSHIFT(ccsidr) + 4;   /* log2(cache-line-size-in-bytes) */
+  ways   = CCSIDR_WAYS(ccsidr);          /* (Number of ways) - 1 */
+
+  /* Calculate the bit offset for the way field in the DCCISW register by
+   * counting the number of leading zeroes.  For example:
+   *
+   *   Number of  Value of ways  Field
+   *   Ways       'ways'         Offset
+   *     2         1             31
+   *     4         3             30
+   *     8         7             29
+   *   ...
+   */
+
+  wshift = __CLZ(ways) & 0x1f;
+
+  /* Clean and invalidate the D-Cache over the range of addresses */
+
+  ssize  = (1 << sshift);
+  start &= ~(ssize - 1);
+  __DSB();
+
+  do
+    {
+      int32_t tmpways = ways;
+
+      /* Isolate the cache line associated with this address.  For example
+       * if the cache line size is 32 bytes and the cache size is 16KB, then
+       *
+       *   sshift = 5      : Offset to the beginning of the set field
+       *   smask  = 0x007f : Mask of the set field
+       */
+
+      sets = ((uint32_t)start >> sshift) & smask;
+
+      /* Clean and invalidate each way for this cacheline */
+
+      do
+        {
+          sw = ((tmpways << wshift) | (sets << sshift));
+          SCB->DCCISW=sw;
+
+        }
+      while (tmpways--);
+
+      /* Increment the address by the size of one cache line. */
+
+      start += ssize;
+    }
+  while (start < ende);
+
+  __DSB();
+  __ISB();
+}
+
+void BSP_SD_CommandTransaction(char cmd, unsigned int arg)
+{
+  SDMMC_CmdInitTypeDef sdmmc_cmdinitstructure;
+  uSdHandle.Instance = SDMMC1;
+  sdmmc_cmdinitstructure.Argument         = (uint32_t)arg;
+  sdmmc_cmdinitstructure.CmdIndex         = cmd;
+  sdmmc_cmdinitstructure.Response         = SDMMC_RESPONSE_SHORT;
+  sdmmc_cmdinitstructure.WaitForInterrupt = SDMMC_WAIT_NO;
+  sdmmc_cmdinitstructure.CPSM             = SDMMC_CPSM_ENABLE;
+  SDMMC_SendCommand(uSdHandle.Instance, &sdmmc_cmdinitstructure);
+}
+
+
+void BSP_SD_Set_RX_Busy(void)
+{
+    RX_Busy=1;
+}
+void BSP_SD_Clear_RX_Busy(void)
+{
+    RX_Busy=0;
+}
+int BSP_SD_Get_RX_busy(void)
+{
+    return RX_Busy;
+}
+
+void BSP_SD_Set_TX_Busy(void)
+{
+    TX_Busy=1;
+}
+void BSP_SD_Clear_TX_Busy(void)
+{
+    TX_Busy=0;
+}
+int BSP_SD_Get_TX_busy(void)
+{
+    return TX_Busy;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SD_Helper.h	Thu Mar 31 17:39:48 2016 +0000
@@ -0,0 +1,26 @@
+ /* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef ___SD_Helper
+#define ___SD_Helper
+
+#include "cmsis.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+void CPU_CACHE_Flush(uint32_t * buffer, uint32_t length);
+
+void    BSP_SD_CommandTransaction(char cmd, unsigned int arg);
+
+void BSP_SD_Set_RX_Busy(void);
+void BSP_SD_Clear_RX_Busy(void);
+int BSP_SD_Get_RX_busy(void);
+void BSP_SD_Set_TX_Busy(void);
+void BSP_SD_Clear_TX_Busy(void);
+int BSP_SD_Get_TX_busy(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ___SD_Helper */