Diff: PRAMFileSystem.h

Revision:

0:475e05403ad8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PRAMFileSystem.h	Mon Nov 12 15:36:45 2012 +0000
@@ -0,0 +1,57 @@
+/*
+ * Memory File System Library, for SPI PRAM NP8P128A13 (Micron)
+ * Copyright (c) 2012 Hiroshi Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#ifndef _PRAMFileSystem_H_
+#define _PRAMFileSystem_H_
+
+#include "mbed.h"
+#include "FATFileSystem.h"
+
+#define CMD_WREN    0x06    // Write enable
+#define CMD_WRDI    0x04    // Write disable
+#define CMD_RDID    0x9f    // Read identification 
+#define CMD_RDSR    0x05    // Read status register
+#define CMD_WRSR    0x01    // Write status registe
+#define CMD_READ    0x03    // Read data bytes
+#define CMD_FREAD   0x0b    // Read data bytes at higher speed
+#define CMD_PP      0x02    // Page program (legacy program)
+#define CMD_PP_BA   0x22    // Page program (bit-alterable write)
+#define CMD_PP_1S   0xd1    // Page program (On all 1s)
+#define CMD_SE      0xd8    // Sector erase
+
+
+class PRAMFileSystem : public FATFileSystem {
+public:
+
+    /** Create the File System for accessing an SD Card using SPI
+     *
+     * @param mosi SPI mosi pin connected to SD Card
+     * @param miso SPI miso pin conencted to SD Card
+     * @param sclk SPI sclk pin connected to SD Card
+     * @param cs   DigitalOut pin used as SD Card chip select
+     * @param name The name used to access the virtual filesystem
+     */
+    PRAMFileSystem (PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
+    virtual int disk_initialize ();
+    virtual int disk_write (const char *buffer, int block_number);
+    virtual int disk_read (char *buffer, int block_number);    
+    virtual int disk_status ();
+    virtual int disk_sync ();
+    virtual int disk_sectors ();
+
+protected:
+
+    int _init ();
+    int _status ();
+    int _read (int addr, char *buf, int len);
+    int _write (int addr, const char *buf, int len);
+    int _sectors;
+    
+    SPI _spi;
+    DigitalOut _cs; 
+};
+
+#endif