mi mi / SDFileSystemDMA Featured

first 2016/02 SDFileSystemDMA inherited from Official SDFileSystem.

Dependents:   SDFileSystemDMA-test DmdFullRGB_0_1

Fork of SDFileSystemDMA by mi mi

SDFileSystemDMA is enhanced SDFileSystem library for STM32 micros by using DMA functionality.
Max read transfer rate reaches over 2MByte/sec at 24MHz SPI clock if enough read buffer size is set.
Even though minimum read buffer size (512Byte) is set, read transfer rate will reach over 1MByte/sec at 24MHz SPI Clock.
( but depends on the ability of each SD card)

Test program is here.
https://developer.mbed.org/users/mimi3/code/SDFileSystemDMA-test/

/media/uploads/mimi3/sdfilesystemdma-speed-test3-read-buffer-512byte.png

/media/uploads/mimi3/sdfilesystemdma-speed-test-buffer-vs-spi-clock-nucleo-f411re-96mhz.png

Supported SPI port is shown below table.

(v): Verified. It works well.
(w): Probably it will work well. (not tested)
(c): Only compiled. (not tested)
(f): Over flash.
(r): Only read mode. (when _FS_READONLY==1)
(u) Under construction
(z): Dose not work.

Caution

If your board has SRAM less than or equal to 8KB, the buffer size must be set to 512 Bytes.

Supported Boards:
Cortex-M0

BoardSRAMSPI1SPI2SPI3
NUCLEO-F030R88KB(v)
DISCO-F051R88KB(w)
NUCLEO-F031K64KB(f)
NUCLEO-F042K66KB(r)
NUCLEO-F070RB16KB(w)
NUCLEO-F072RB16KB(w)
NUCLEO-F091RC32KB(c)

Cortex-L0

BoardSRAMSPI1SPI2SPI3
DISCO-L053C88KB(c)
NUCLEO-L053R88KB(c)
NUCLEO-L073RZ20KB(c)

Cortex-M3

BoardSRAMSPI1SPI2SPI3
DISCO-F100RB8KB(v)(v)-
BLUEPILL-F103CB20KB(w)(w)-
NUCLEO-F103RB20KB(v)(v)-
NUCLEO-L152RE80KB(v)(w)-
MOTE-L152RC32KB(w)(w)-

Cortex-M4
F3

BoardSRAMSPI1SPI2SPI3
DISCO-F303VC40KB-(v)(v)
NUCLEO-F303RE64KB(w)(w)(w)
NUCLEO-F302R816KB--(c)
NUCLEO-F303K812KB(c)--
DISCO-F334C812KB(c)--
NUCLEO-F334R812KB(c)--

F4

BoardSPI1SPI2SPI3
ELMO-F411RE(w)-(w)
MTS-MDOT-F411RE(u)-(u)
MTS-DRAGONFLY-F411RE(w)-(w)
NUCLEO-F411RE(v)-(v)
NUCLEO-F401RE(w)-(w)
MTS-MDOT-F405RG(u)-(u)
NUCLEO-F410RB(c)-(c)
NUCLEO-F446RE(c)-(c)
NUCLEO-F429ZI(c)-(c)
B96B-F446VE(c)-(c)
NUCLEO-F446ZE(c)-(c)
DISCO-F429ZI(u)-(u)
DISCO-F469NI(c)-(c)

Information

This library is set to use "short file name" in SDFileSystemDMA/FATFileSystem/ChaN/ffconf.h . ( _USE_LFN=0)
You can change this option to _USE_LFN=1 .

Diff: SDFileSystemDMA.cpp

Revision:
21:41129109d6ab
Parent:
17:e6d3b7ed3799
Child:
29:5375c51d0cfc
--- a/SDFileSystemDMA.cpp	Mon Feb 15 22:40:41 2016 +0900
+++ b/SDFileSystemDMA.cpp	Tue Feb 16 23:45:35 2016 +0900
@@ -114,6 +114,9 @@
  */
 #include "SDFileSystemDMA.h"
 #include "mbed_debug.h"
+#include "spi_dma.h"
+
+#define __SPI_DMA__
 
 #define SD_COMMAND_TIMEOUT 5000
 
@@ -126,6 +129,8 @@
     // Set default to 100kHz for initialisation and 1MHz for data transfer
     _init_sck = 100000;
     //_transfer_sck = 12000000;
+	_spi_id = spi_get_id(mosi, miso, sclk, NC);
+	spi_dma_init( _spi_id );
 }
 
 #define R1_IDLE_STATE           (1 << 0)
@@ -382,15 +387,6 @@
     return -1; // timeout
 }
 
-#define __SPI_DMA__
-#include "spi_dma.h"
-#if defined(__SPI_DMA__)
-#if defined(TARGET_DISCO_F303VC) || defined(TARGET_NUCLEO_F303RE)
-SPI_TypeDef *spi_id = SPI3;
-#else
-SPI_TypeDef *spi_id = SPI1;
-#endif
-#endif
 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
     _cs = 0;
 
@@ -400,7 +396,7 @@
     // read data
 #if defined( __SPI_DMA__)
 	uint8_t dummyByte = 0xFF;
-    spi_dma_read( spi_id, &dummyByte, buffer, length );
+    spi_dma_read( _spi_id, &dummyByte, buffer, length );
 #else
     for (uint32_t i = 0; i < length; i++) {
         buffer[i] = _spi.write(0xFF);
@@ -422,9 +418,9 @@
 
     // write the data
 #if defined( __SPI_DMA__)
-	#if 1 /* Dangerous !! Very bugy at this moment !  Absolutely breaks SD card.*/
+	#if 1 
 	uint8_t dummyByte ;
-	spi_dma_write( spi_id, (uint8_t *)buffer, &dummyByte, length );
+	spi_dma_write( _spi_id, (uint8_t *)buffer, &dummyByte, length );
 	#else
 	for (uint32_t i = 0; i < length; i++) {
         _spi.write(buffer[i]);