Diff: eeprom.cpp

Revision:

0:c32514e75196

Child:

1:724b44e46ecf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eeprom.cpp	Sat Aug 04 11:36:21 2012 +0000
@@ -0,0 +1,60 @@
+/**
+ * @file
+ */
+
+#include "mbed.h"
+#include "eeprom.h"
+
+enum command_code
+        {
+            IAPCommand_EEPROM_Write = 61,
+            IAPCommand_EEPROM_Read,
+        };
+
+#define     IAP_LOCATION    0x1fff1ff1
+typedef     void (*IAP_call)(unsigned int [], unsigned int []);
+
+IAP_call        iap_entry = reinterpret_cast<IAP_call>(IAP_LOCATION);
+unsigned int    IAP_command[ 5 ];
+unsigned int    IAP_result[ 5 ];
+int             cclk_kHz = SystemCoreClock / 1000;
+
+/** Copy RAM to EEPROM (LPC11U24)
+ *  
+ *  @param    source_addr    Source RAM address from which data bytes are to be read.
+ *  @param    target_addr    Destination EEPROM address where data bytes are to be written.
+ *  @param    size           Number of bytes to be written.
+ *  @return   error code: CMD_SUCCESS | SRC_ADDR_NOT_MAPPED | DST_ADDR_NOT_MAPPED
+ *  Remark: The top 64 bytes of the EEPROM memory are reserved and cannot be written to.
+ */
+int write_eeprom( char *source_addr, char *target_addr, int size ) {
+    IAP_command[ 0 ]    = IAPCommand_EEPROM_Write;
+    IAP_command[ 1 ]    = (unsigned int)target_addr;    //  Destination EEPROM address where data bytes are to be written. This address should be a 256 byte boundary.
+    IAP_command[ 2 ]    = (unsigned int)source_addr;    //  Source RAM address from which data bytes are to be read. This address should be a word boundary.
+    IAP_command[ 3 ]    = size;                         //  Number of bytes to be written. Should be 256 | 512 | 1024 | 4096.
+    IAP_command[ 4 ]    = cclk_kHz;                     //  CPU Clock Frequency (CCLK) in kHz.
+
+    iap_entry( IAP_command, IAP_result );
+
+    return ( (int)IAP_result[ 0 ] );
+}
+
+/** Copy EEPROM to RAM (LPC11U24)
+ *  
+ *  @param    source_addr    Source EEPROM address from which data bytes are to be read.
+ *  @param    target_addr    Destination RAM address where data bytes are to be written.
+ *  @param    size           Number of bytes to be written.
+ *  @return   error code: CMD_SUCCESS | SRC_ADDR_NOT_MAPPED | DST_ADDR_NOT_MAPPED
+ *  Remark: The top 64 bytes of the EEPROM memory are reserved and cannot be written to.
+ */
+int read_eeprom( char *source_addr, char *target_addr, int size ) {
+    IAP_command[ 0 ]    = IAPCommand_EEPROM_Read;
+    IAP_command[ 1 ]    = (unsigned int)source_addr;    //  Source EEPROM address from which data bytes are to be read. This address should be a word boundary.
+    IAP_command[ 2 ]    = (unsigned int)target_addr;    //  Destination RAM address where data bytes are to be written. This address should be a 256 byte boundary.
+    IAP_command[ 3 ]    = size;                         //  Number of bytes to be written. Should be 256 | 512 | 1024 | 4096.
+    IAP_command[ 4 ]    = cclk_kHz;                     //  CPU Clock Frequency (CCLK) in kHz.
+
+    iap_entry( IAP_command, IAP_result );
+
+    return ( (int)IAP_result[ 0 ] );
+}