Diff: Ser25lcxxx.h

Revision:

3:be69a9f6f738

Parent:

2:3a3404dbd3eb

--- a/Ser25lcxxx.h	Sat Feb 19 18:29:20 2011 +0000
+++ b/Ser25lcxxx.h	Fri Jul 17 09:47:32 2015 +0000
@@ -26,70 +26,182 @@
 
 #include "mbed.h"
 
-/**
-A class to read and write all 25* serial SPI eeprom devices from Microchip (from 25xx010 to 25xx1024).
+
+#define EEPROM_CMD_READ     0x03
+#define EEPROM_CMD_WRITE    0x02
+#define EEPROM_CMD_WRDI     0x04
+#define EEPROM_CMD_WREN     0x06
+#define EEPROM_CMD_RDSR     0x05
+#define EEPROM_CMD_WRSR     0x01
+
+
+#define EEPROM_SPI_SPEED    1000000
 
-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!)
+#define EEPROM_CLEAN_BYTE   0xff
+
+
+/**
+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)
+            Create the handler class
+            
+            @param sck clock pin of the spi where the eeprom is connected
+            @param si input pin of the spi where the eeprom is connected
+            @param so output pin of the spi where the eeprom is connected
             @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
+            @param pagenumber number of pages
+            @param pagesize the size of each page
         */
-        Ser25LCxxx(SPI *spi, PinName enable, int bytes, int pagesize);
+        Ser25LCxxx(PinName sck, PinName si, PinName so, PinName enable,
+                                                int pagenumber, int pagesize);
+        
+        /**
+            Destroy the handler
+        */
+        ~Ser25LCxxx() {};
         
         /**
-            destroys the handler, and frees the /CS pin        
+            Read from the eeprom memory
+            
+            @param startAdr the adress where to start reading
+            @param len the number of bytes to read
+            @param buf destination buffer
+            @return number of read bytes
         */
-        ~Ser25LCxxx();
+        unsigned int read(unsigned int startAdr, unsigned int len,
+                                                        unsigned char* buf);
         
         /**
-            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
+            Writes the give buffer into the eeprom memory
+
+            @param startAdr the eeprom adress where to start writing (it 
+                                        doesn't have to match a page boundary)
+            @param len number of bytes to write
+            @param data data to write
+            @return the number of written bytes
         */
-        char* read(unsigned int startAdr, unsigned int len);
+        unsigned int write(unsigned int startAdr, unsigned int len,
+                                                    const unsigned char* data);
+        
+        /**
+            Fills the given page with EEPROM_CLEAN_BYTE
+
+            @param pageNum the page to clear
+            @return the number of written bytes (it should be the page size)
+        */
+        unsigned int clearPage(unsigned int pageNum);
         
         /**
-            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
+            Fills the whole eeprom with EEPROM_CLEAN_BYTE
+            
+            @return the number of written bytes (it should be the eeprom size)
+        */
+        unsigned int clearMem();
+
+        /**
+            Return TRUE if a write is performing
+        */
+        bool isWriteInProgress() {
+            return (readStatus()&0x01)!=0x00;
+        }
+
+        /**
+            Return TRUE if the entire eeprom memory is writable
+        */
+        bool isFullyWritable() {
+            return (readStatus()&0x0C)==0x00;
+        }
+
+        /**
+            Return TRUE if only the first half of the eeprom memory is writable
         */
-        bool write(unsigned int startAdr, unsigned int len, const char* data);
-        
+        bool isHalfWritable() {
+            return (readStatus()&0x0C)==0x08;
+        }
+
+        /**
+            Return TRUE if the eeprom memory is not writable
+        */
+        bool isNotWritable() {
+            return (readStatus()&0x0C)==0x0C;
+        }
+
         /**
-            fills the given page with 0xFF
-            @param pageNum the page number to clear
-            @return if the pageNum is out of range        
+            Set the eeprom memory not writable
         */
-        bool clearPage(unsigned int pageNum);
+        void setNotWritable () {
+            writeStatus(0x0C);
+        }
+
+        /**
+            Set the eeprom memory fully writable
+        */
+        void setFullyWritable () {
+            writeStatus(0x00);
+        }
         
         /**
-            fills the while eeprom with 0xFF
+            Set only the first half of the eeprom memory as writable
         */
-        void clearMem();
+        void setHalfWritable() {
+            writeStatus(0x08);
+        }
+
     private:
-        bool writePage(unsigned int startAdr, unsigned int len, const char* data);
+    
+        /**
+            Write data within an eeprom page
+            
+            @param startAdr destination address of the eeprm memory
+            @param len number of bytes to write
+            @param data data to be written in the eeprom memory
+            @return number of written bytes
+        */
+        unsigned int writePage(unsigned int startAdr, unsigned int len,
+                                                    const unsigned char* data);
+                                                    
+        /**
+            Read the status register of the eeprom memory
+            
+            @return status register
+        */
         int readStatus();
-        void waitForWrite();
-        void enableWrite();
         
+        /**
+            Write the status register
+            
+            @param val status register
+        */
+        void writeStatus(unsigned char val);
 
-        SPI* _spi;
-        DigitalOut* _enable;
-        int _size,_pageSize;
+        /**
+            Wait until a write procedure ends or an interval of 5ms is expired
+            
+            @return TRUE if the write procedure has successfully terminated,
+                FALSE if the interval is expired
+        */
+        bool waitForWrite();
         
+        /**
+            Enable the write procedure
+        */
+        void enableWrite();
+
+        SPI spi;
+        DigitalOut cs;
+        int size;
+        int pageSize;
+        int pageNumber;
 };
 
-
-
 #endif