first 2016/02 SDFileSystemDMA inherited from Official SDFileSystem.
Dependents: SDFileSystemDMA-test DmdFullRGB_0_1
Fork of SDFileSystemDMA by
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 .
FATFileSystem/MemFileSystem.h@10:b48d3ace55db, 2016-02-14 (annotated)
- Committer:
- mimi3
- Date:
- Sun Feb 14 21:58:51 2016 +0900
- Revision:
- 10:b48d3ace55db
added: FATFileSystem
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mimi3 | 10:b48d3ace55db | 1 | /* mbed Microcontroller Library - MemFileSystem |
mimi3 | 10:b48d3ace55db | 2 | * Copyright (c) 2008, sford |
mimi3 | 10:b48d3ace55db | 3 | */ |
mimi3 | 10:b48d3ace55db | 4 | |
mimi3 | 10:b48d3ace55db | 5 | |
mimi3 | 10:b48d3ace55db | 6 | #ifndef MBED_MEMFILESYSTEM_H |
mimi3 | 10:b48d3ace55db | 7 | #define MBED_MEMFILESYSTEM_H |
mimi3 | 10:b48d3ace55db | 8 | |
mimi3 | 10:b48d3ace55db | 9 | #include "FATFileSystem.h" |
mimi3 | 10:b48d3ace55db | 10 | |
mimi3 | 10:b48d3ace55db | 11 | namespace mbed |
mimi3 | 10:b48d3ace55db | 12 | { |
mimi3 | 10:b48d3ace55db | 13 | |
mimi3 | 10:b48d3ace55db | 14 | class MemFileSystem : public FATFileSystem |
mimi3 | 10:b48d3ace55db | 15 | { |
mimi3 | 10:b48d3ace55db | 16 | public: |
mimi3 | 10:b48d3ace55db | 17 | |
mimi3 | 10:b48d3ace55db | 18 | // 2000 sectors, each 512 bytes (malloced as required) |
mimi3 | 10:b48d3ace55db | 19 | char *sectors[2000]; |
mimi3 | 10:b48d3ace55db | 20 | |
mimi3 | 10:b48d3ace55db | 21 | MemFileSystem(const char* name) : FATFileSystem(name) { |
mimi3 | 10:b48d3ace55db | 22 | memset(sectors, 0, sizeof(sectors)); |
mimi3 | 10:b48d3ace55db | 23 | } |
mimi3 | 10:b48d3ace55db | 24 | |
mimi3 | 10:b48d3ace55db | 25 | virtual ~MemFileSystem() { |
mimi3 | 10:b48d3ace55db | 26 | for(int i = 0; i < 2000; i++) { |
mimi3 | 10:b48d3ace55db | 27 | if(sectors[i]) { |
mimi3 | 10:b48d3ace55db | 28 | free(sectors[i]); |
mimi3 | 10:b48d3ace55db | 29 | } |
mimi3 | 10:b48d3ace55db | 30 | } |
mimi3 | 10:b48d3ace55db | 31 | } |
mimi3 | 10:b48d3ace55db | 32 | |
mimi3 | 10:b48d3ace55db | 33 | // read a sector in to the buffer, return 0 if ok |
mimi3 | 10:b48d3ace55db | 34 | virtual int disk_read(char *buffer, int sector) { |
mimi3 | 10:b48d3ace55db | 35 | if(sectors[sector] == 0) { |
mimi3 | 10:b48d3ace55db | 36 | // nothing allocated means sector is empty |
mimi3 | 10:b48d3ace55db | 37 | memset(buffer, 0, 512); |
mimi3 | 10:b48d3ace55db | 38 | } else { |
mimi3 | 10:b48d3ace55db | 39 | memcpy(buffer, sectors[sector], 512); |
mimi3 | 10:b48d3ace55db | 40 | } |
mimi3 | 10:b48d3ace55db | 41 | return 0; |
mimi3 | 10:b48d3ace55db | 42 | } |
mimi3 | 10:b48d3ace55db | 43 | |
mimi3 | 10:b48d3ace55db | 44 | // write a sector from the buffer, return 0 if ok |
mimi3 | 10:b48d3ace55db | 45 | virtual int disk_write(const char *buffer, int sector) { |
mimi3 | 10:b48d3ace55db | 46 | // if buffer is zero deallocate sector |
mimi3 | 10:b48d3ace55db | 47 | char zero[512]; |
mimi3 | 10:b48d3ace55db | 48 | memset(zero, 0, 512); |
mimi3 | 10:b48d3ace55db | 49 | if(memcmp(zero, buffer, 512)==0) { |
mimi3 | 10:b48d3ace55db | 50 | if(sectors[sector] != 0) { |
mimi3 | 10:b48d3ace55db | 51 | free(sectors[sector]); |
mimi3 | 10:b48d3ace55db | 52 | sectors[sector] = 0; |
mimi3 | 10:b48d3ace55db | 53 | } |
mimi3 | 10:b48d3ace55db | 54 | return 0; |
mimi3 | 10:b48d3ace55db | 55 | } |
mimi3 | 10:b48d3ace55db | 56 | // else allocate a sector if needed, and write |
mimi3 | 10:b48d3ace55db | 57 | if(sectors[sector] == 0) { |
mimi3 | 10:b48d3ace55db | 58 | char *sec = (char*)malloc(512); |
mimi3 | 10:b48d3ace55db | 59 | if(sec==0) { |
mimi3 | 10:b48d3ace55db | 60 | return 1; // out of memory |
mimi3 | 10:b48d3ace55db | 61 | } |
mimi3 | 10:b48d3ace55db | 62 | sectors[sector] = sec; |
mimi3 | 10:b48d3ace55db | 63 | } |
mimi3 | 10:b48d3ace55db | 64 | memcpy(sectors[sector], buffer, 512); |
mimi3 | 10:b48d3ace55db | 65 | return 0; |
mimi3 | 10:b48d3ace55db | 66 | } |
mimi3 | 10:b48d3ace55db | 67 | |
mimi3 | 10:b48d3ace55db | 68 | // return the number of sectors |
mimi3 | 10:b48d3ace55db | 69 | virtual int disk_sectors() { |
mimi3 | 10:b48d3ace55db | 70 | return sizeof(sectors)/sizeof(sectors[0]); |
mimi3 | 10:b48d3ace55db | 71 | } |
mimi3 | 10:b48d3ace55db | 72 | |
mimi3 | 10:b48d3ace55db | 73 | }; |
mimi3 | 10:b48d3ace55db | 74 | |
mimi3 | 10:b48d3ace55db | 75 | } |
mimi3 | 10:b48d3ace55db | 76 | |
mimi3 | 10:b48d3ace55db | 77 | #endif |