mi mi
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/
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
| Board | SRAM | SPI1 | SPI2 | SPI3 |
|---|---|---|---|---|
| NUCLEO-F030R8 | 8KB | (v) | ||
| DISCO-F051R8 | 8KB | (w) | ||
| 4KB | (f) | |||
| NUCLEO-F042K6 | 6KB | (r) | ||
| NUCLEO-F070RB | 16KB | (w) | ||
| NUCLEO-F072RB | 16KB | (w) | ||
| NUCLEO-F091RC | 32KB | (c) |
Cortex-L0
| Board | SRAM | SPI1 | SPI2 | SPI3 |
|---|---|---|---|---|
| DISCO-L053C8 | 8KB | (c) | ||
| NUCLEO-L053R8 | 8KB | (c) | ||
| NUCLEO-L073RZ | 20KB | (c) |
Cortex-M3
| Board | SRAM | SPI1 | SPI2 | SPI3 |
|---|---|---|---|---|
| DISCO-F100RB | 8KB | (v) | (v) | - |
| BLUEPILL-F103CB | 20KB | (w) | (w) | - |
| NUCLEO-F103RB | 20KB | (v) | (v) | - |
| NUCLEO-L152RE | 80KB | (v) | (w) | - |
| MOTE-L152RC | 32KB | (w) | (w) | - |
Cortex-M4
F3
| Board | SRAM | SPI1 | SPI2 | SPI3 |
|---|---|---|---|---|
| DISCO-F303VC | 40KB | - | (v) | (v) |
| NUCLEO-F303RE | 64KB | (w) | (w) | (w) |
| NUCLEO-F302R8 | 16KB | - | - | (c) |
| NUCLEO-F303K8 | 12KB | (c) | - | - |
| DISCO-F334C8 | 12KB | (c) | - | - |
| NUCLEO-F334R8 | 12KB | (c) | - | - |
F4
| Board | SPI1 | SPI2 | SPI3 |
|---|---|---|---|
| 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.h
- Revision:
- 3:23e0dcc750fe
- Parent:
- 2:0e871408d51b
- Child:
- 21:41129109d6ab
--- a/SDFileSystemDMA.h Sat Feb 13 18:50:11 2016 +0900
+++ b/SDFileSystemDMA.h Sat Feb 13 22:03:36 2016 +0900
@@ -51,7 +51,7 @@
* @param cs DigitalOut pin used as SD Card chip select
* @param name The name used to access the virtual filesystem
*/
- SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name, int hz = (6*1000000));
+ SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name, uint32_t hz = (6*1000000));
virtual int disk_initialize();
virtual int disk_status();
virtual int disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count);
@@ -78,12 +78,12 @@
// Note: The highest SPI clock rate is 20 MHz for MMC and 25 MHz for SD
void set_transfer_sck(uint32_t sck) { _transfer_sck = sck; }
uint32_t _init_sck;
- uint32_t _transfer_sck;
SPI _spi;
DigitalOut _cs;
int cdv;
int _is_initialized;
+ uint32_t _transfer_sck;
};
#endif