Diff: USBDevice/USBMSD/AT45.h

Revision:

2:27a7e7f8d399

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice/USBMSD/AT45.h	Fri Nov 11 15:22:53 2011 +0000
@@ -0,0 +1,103 @@
+/* mbed Library - AT45
+ * Copyright (c) 2008, cstyles
+
+
+Class to make the AT45 SPI flash parts from ATMEL appear as SRAM or 512 byte block devices
+
+This class supports 011,021,041,081,161,321,641 variants of the AT45DBxxx family
+
+|| Code || Density  || Page size || Pages || Package ||
+|| 011  || 1        || 256       || 512   || 8 SOIC  ||
+|| 021  || 2        || 256       || 1024  || 8 SOIC  ||
+|| 041  || 4        || 256       || 2048  || 8 SOIC  ||
+|| 081  || 8        || 256       || 4096  || 8 SOIC  ||
+|| 161  || 16       || 512       || 4096  || 8 SOIC  ||
+|| 321  || 32       || 512       || 8192  || 8 SOIC  ||
+|| 641  || 64       || 1024      || 8192  || 28 TSOP ||
+
+To do :
+
+ - Check for current status on Erase Chip command not working.
+
+ */
+
+#ifndef MBED_AT45_H
+#define MBED_AT45_H
+ 
+#include "mbed.h"
+
+class AT45 {
+    
+    // Public functions
+    public:        
+
+        AT45(PinName mosi = p5, PinName miso = p6, PinName clk = p7, PinName ncs = p8);
+
+        void erase (void);
+
+        // Integer RAM access
+        char read (int address);  // read int from address. Automatically word-aligns address
+        void write (int address, char data); // Write int to address. Automatically world-aligns address
+
+        // Block device access
+        int blocks (void);  // returns the number of 512 byte blocks
+        int blockread (char* data, int block);  // read a block
+        int blockwrite (char* data, int block); // write a block
+        int blockerase (int block); // erase a block
+    
+        // Part interrogation
+        int size (void);      // Device size in bytes
+        int pages (void);      // Device size in bytes
+        int pagesize (void);      // Device size in bytes
+ 
+        int id (void);        // ID of part
+        int status (void);    // Status register
+        void pollbusy (void); // Wait until Flash is not busy
+
+    // Private variables
+    private :    
+   
+        SPI _spi;
+        DigitalOut _ncs;    
+
+        int _pages;            // Integer number of pages
+        int _pagesize;         // page size, in bytes 
+        int _devicesize;       // device size in bytes
+        int _blocks;           // Number of 512 byte blocks
+    
+        // Some flags for buffering
+        int _buffer1address;
+        int _buffer2address;
+        int _lru;
+    
+        // Helper routunes
+        void _reset();
+        void _select();
+        void _deselect();
+        void _pollbusy (void);               
+    
+        // accessing SRAM buffers
+        void _sramwrite (int buffer, int address, int data);
+        int _sramread (int buffer, int address);
+    
+        // Transferring SRAM buffers to/from FLASH
+        void _flashwrite (int buffer, int paddr);
+        void _flashread (int buffer, int paddr);
+
+        // Allocate buffer
+        int _allocatebuffer(int address);
+        void _flushbuffer(int buffer);
+
+        // Reading FLASH directly
+        int _memread (int address);
+    
+        // Calculate page/subpage addresses
+        int _getpaddr (int);
+        int _getbaddr (int);
+    
+        // Send 3 byte address
+        void _sendaddr (int address);
+        
+};
+
+#endif