Diff: Ser25lcxxx.h

Revision:

0:238ca4fdef8c

Child:

2:3a3404dbd3eb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Ser25lcxxx.h	Wed Jan 26 22:14:41 2011 +0000
@@ -0,0 +1,72 @@
+#ifndef __SER25LCXXX_H__
+#define __SER25LCXXX_H__
+
+#include "mbed.h"
+
+/**
+A class to read and write all 25* serial SPI eeprom devices from Microchip (from 25xx010 to 25xx1024).
+
+One needs to provide total size and page size, since this cannot be read from the devices,
+and the page size differs even by constant size (look up the data sheet for your part!)
+*/
+class Ser25LCxxx
+{
+    public:
+        /**
+            create the handler class
+            @param spi the SPI port where the eeprom is connected. Must be set to format(8,3), and with a speed matching the one of your device (up to 5MHz should work)
+            @param enable the pin name for the port where /CS is connected
+            @param bytes the size of you eeprom in bytes (NOT bits, eg. a 25LC010 has 128 bytes)
+            @param pagesize the size of a single page, to provide overruns
+        */
+        Ser25LCxxx(SPI *spi, PinName enable, int bytes, int pagesize);
+        
+        /**
+            destroys the handler, and frees the /CS pin        
+        */
+        ~Ser25LCxxx();
+        
+        /**
+            read a part of the eeproms memory. The buffer will be allocated here, and must be freed by the user
+            @param startAdr the adress where to start reading. Doesn't need to match a page boundary
+            @param len the number of bytes to read (must not exceed the end of memory)
+            @return NULL if the adresses are out of range, the pointer to the data otherwise
+        */
+        char* read(unsigned int startAdr, unsigned int len);
+        
+        /**
+            writes the give buffer into the memory. This function handles dividing the write into 
+            pages, and waites until the phyiscal write has finished
+            @param startAdr the adress where to start writing. Doesn't need to match a page boundary
+            @param len the number of bytes to read (must not exceed the end of memory)
+            @return false if the adresses are out of range
+        */
+        bool write(unsigned int startAdr, unsigned int len, const char* data);
+        
+        /**
+            fills the given page with 0xFF
+            @param pageNum the page number to clear
+            @return if the pageNum is out of range        
+        */
+        bool clearPage(unsigned int pageNum);
+        
+        /**
+            fills the while eeprom with 0xFF
+        */
+        void clearMem();
+    private:
+        bool writePage(unsigned int startAdr, unsigned int len, const char* data);
+        int readStatus();
+        void waitForWrite();
+        void enableWrite();
+        
+
+        SPI* _spi;
+        DigitalOut* _enable;
+        int _size,_pageSize;
+        
+};
+
+
+
+#endif