Diff: DipCortex-EEprom.cpp

Revision:

0:53297f36733d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DipCortex-EEprom.cpp	Sun Feb 23 22:52:19 2014 +0000
@@ -0,0 +1,211 @@
+//-----------------------------------------------------------------------------
+//* Software that is described herein is for illustrative purposes only
+//* which provides customers with programming information regarding the
+//* products. This software is supplied "AS IS" without any warranties.
+//* NXP Semiconductors assumes no responsibility or liability for the
+//* use of the software, conveys no license or title under any patent,
+//* copyright, or mask work right to the product. NXP Semiconductors
+//* reserves the right to make changes in the software without
+//* notification. NXP Semiconductors also make no representation or
+//* warranty that such application will be suitable for the specified
+//* use without further testing or modification.
+//* Permission to use, copy, modify, and distribute this software and its
+//* documentation is hereby granted, under NXP Semiconductors'
+//* relevant copyright in the software, without fee, provided that it
+//* is used in conjunction with NXP Semiconductors microcontrollers.  This
+//* copyright, permission, and disclaimer notice must appear in all copies of
+//* this code.
+//-----------------------------------------------------------------------------
+
+#include <stdint.h>
+#include <string.h>
+#include "DipCortex-EEprom.h"
+#include "LPC13Uxx.h"            
+
+unsigned param_table[5];
+unsigned result_table[5];
+
+unsigned cclk;
+char flash_buf[FLASH_BUF_SIZE];
+unsigned * flash_address;
+unsigned byte_ctr;
+
+#define iap_entry ((void (*)(unsigned [],unsigned []))(IAP_ADDRESS))
+
+void IAP_WriteData(unsigned cclk,unsigned flash_address,unsigned * flash_data_buf, unsigned count);
+void IAP_PrepareEraseSector( unsigned flash_address );
+void IAP_EraseSector(unsigned start_sector,unsigned end_sector,unsigned cclk);
+void IAP_PrepareSector(unsigned start_sector,unsigned end_sector,unsigned cclk);
+
+
+void IAP_WriteData(unsigned cclk,unsigned flash_address,unsigned * flash_data_buf, unsigned count)
+{
+    param_table[0] = COPY_RAM_TO_FLASH;
+    param_table[1] = flash_address;
+    param_table[2] = (unsigned)flash_data_buf;
+    param_table[3] = count;
+    param_table[4] = cclk;
+    iap_entry(param_table,result_table);
+}
+
+void IAP_EraseSector(unsigned start_sector,unsigned end_sector,unsigned cclk)
+{
+    param_table[0] = ERASE_SECTOR;
+    param_table[1] = start_sector;
+    param_table[2] = end_sector;
+    param_table[3] = cclk;
+    iap_entry(param_table,result_table);
+}
+
+void IAP_PrepareSector(unsigned start_sector,unsigned end_sector,unsigned cclk)
+{
+    param_table[0] = PREPARE_SECTOR_FOR_WRITE;
+    param_table[1] = start_sector;
+    param_table[2] = end_sector;
+    param_table[3] = cclk;
+    iap_entry(param_table,result_table);
+}
+
+int IAP_ErasePage ( unsigned startPageNo, unsigned endPageNo, unsigned cclk )
+{
+    param_table[0] = ERASE_PAGE;
+    param_table[1] = startPageNo;
+    param_table[2] = endPageNo;
+    param_table[3] = cclk;
+    iap_entry(param_table,result_table);
+
+    if( result_table[0] == CMD_SUCCESS )
+    {
+        return (1);
+    }
+    else
+    {
+        return (0);
+    }
+}
+
+void IAP_PrepareEraseSector( unsigned flash_address )
+{
+unsigned i;
+unsigned end_sector;
+
+    end_sector = MAX_USER_SECTOR;
+
+    for(i=0; i<=end_sector; i++)
+    {
+        if(flash_address < (SECTOR_0_START_ADDR + ((i + 1) * SECTOR_SIZE)))
+        {
+            LPC_GPIO->NOT[ 1 ] = 1<<16;
+
+            // if its the start of a sector, erase it
+            if( flash_address == SECTOR_0_START_ADDR + (SECTOR_SIZE * i))
+            {
+                IAP_PrepareSector(i,i,cclk);
+                IAP_EraseSector(i,i,cclk);
+            }
+            IAP_PrepareSector(i,i,cclk);
+            break;
+        }
+    }
+}
+
+int IAP_WritePage (unsigned * dst, char * src, unsigned no_of_bytes)
+{
+unsigned enabled_irqs;
+
+    // A copy of any enabled interrupts
+    enabled_irqs = NVIC->ISER[0];
+    NVIC->ICER[0] = enabled_irqs;
+
+    memcpy(&flash_buf[0], src, no_of_bytes);
+
+    // If the address is the start of a sector then, prepare and erase it
+    IAP_PrepareEraseSector((unsigned)dst);
+    //IAP_ErasePage (1, 1, cclk);
+
+    IAP_WriteData(cclk, (unsigned)dst, (unsigned *)flash_buf, FLASH_BUF_SIZE);
+
+    NVIC->ISER[0] = enabled_irqs;
+
+    return( result_table[0] );
+}
+
+int IAP_CheckForUserCode(void)
+{
+    unsigned *pmem, checksum,i;
+
+    param_table[0] = BLANK_CHECK_SECTOR;
+    param_table[1] = USER_START_SECTOR;
+    param_table[2] = USER_START_SECTOR;
+    iap_entry(param_table,result_table);
+
+    if( result_table[0] == CMD_SUCCESS )
+    {
+        // it's blank
+        return (0);
+    }
+    else
+    {
+        /*
+         * The reserved Cortex-M3 exception vector location 7 (offset 0x001C
+         * in the vector table) should contain the 2’s complement of the
+         * checksum of table entries 0 through 6. This causes the checksum
+         * of the first 8 table entries to be 0. This code checksums the
+         * first 8 locations of the start of user flash. If the result is 0,
+         * then the contents is deemed a 'valid' image.
+         */
+        checksum = 0;
+        pmem = (unsigned *)USER_START_SECTOR;
+        for (i = 0; i <= 7; i++)
+        {
+            checksum += *pmem;
+            pmem++;
+        }
+        if (checksum != 0)
+        {
+            // Failed to checksum, not valid
+        }
+        else
+        {
+            // Checksum passed
+            return (1);
+        }
+    }
+
+    return (0);
+}
+
+void IAP_Init( void )
+{
+    cclk = CCLK;
+    byte_ctr = 0;
+    flash_address = (unsigned *)UPDATE_REQD;
+}
+
+void IAP_Eeprom_Write ( uint32_t eeAddress, uint8_t* buffAddress, uint32_t byteCount )
+{
+    unsigned int command[5], result[4];
+
+    command[0] = EEPROM_WRITE;
+    command[1] = (uint32_t) eeAddress;
+    command[2] = (uint32_t) buffAddress;
+    command[3] = byteCount;
+    command[4] = cclk;
+
+    /* Invoke IAP call...*/
+    iap_entry(command, result);
+}
+
+void IAP_Eeprom_Read ( uint32_t eeAddress, uint8_t* buffAddress, uint32_t byteCount )
+{
+    unsigned int command[5], result[4];
+
+    command[0] = EEPROM_READ;
+    command[1] = (uint32_t) eeAddress;
+    command[2] = (uint32_t) buffAddress;
+    command[3] = byteCount;
+    command[4] = cclk;
+
+    /* Invoke IAP call...*/
+    iap_entry( command, result);
+}