flash_lib.c

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/* Copyright (c) 2009 Atmel Corporation. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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 * 3. The name of Atmel may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
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/*_____ I N C L U D E S ____________________________________________________*/
#include "config.h"
#include "flash_lib.h"
#include "flash_drv.h"


// These functions pointers are used to call functions entry points in bootloader
void (*boot_flash_page_erase_and_write)(unsigned long adr)=(void (*)(unsigned long))(LAST_BOOT_ENTRY-12);
U8 (*boot_flash_read_sig) (unsigned long adr)=(U8 (*)(unsigned long))(LAST_BOOT_ENTRY-10);
U8 (*boot_flash_read_fuse) (unsigned long adr)=(U8 (*)(unsigned long))(LAST_BOOT_ENTRY-8);
void (*boot_flash_fill_temp_buffer) (unsigned int data,unsigned int adr)=(void (*)(unsigned int, unsigned int))(LAST_BOOT_ENTRY-6);
void (*boot_flash_prg_page) (unsigned long adr)=(void (*)(unsigned long))(LAST_BOOT_ENTRY-4);
void (*boot_flash_page_erase) (unsigned long adr)=(void (*)(unsigned long))(LAST_BOOT_ENTRY-2);
void (*boot_lock_wr_bits) (unsigned char val)=(void (*)(unsigned char))(LAST_BOOT_ENTRY);



/*_____ M A C R O S ________________________________________________________*/

/*_____ D E F I N I T I O N S ______________________________________________*/

/*_____ D E C L A R A T I O N S ____________________________________________*/


void flash_wr_byte(Uint32 addr_byte, Uchar value)
{
  Enable_flash();
  flash_wr_block(&value, addr_byte, 1);
  Disable_flash();
}


Uchar flash_wr_block(Byte _MemType_* src, Uint32 dst, U16 n)
{
   U16 nb_word, temp16;
   U32 address;
   U32 save_page_adr;
   U8 page_is_blank;

   while(n)  // While there is data to load from src buffer
   {
      page_is_blank=TRUE;
      address=dst-(LOW(dst)%FLASH_PAGE_SIZE); // Compute the start of the page to be modified
      save_page_adr=address; //memorize page addr

      // For each word in this page
      for(nb_word=0;nb_word<FLASH_PAGE_SIZE/2;nb_word++)
      {
         if(n) //Still some data to load from src
         {
            if(address>=dst) //current address is inside the target range adr
            {
               MSB(temp16)=(*(U8*)src); //load MSB of word from buffer src
               src++; n--;
               if(n) //Still some data to load ?
               {
                  LSB(temp16)=(*(U8*)src); //load LSB of word from buffer src
                  src++; n--;
               }
               else  //only the MSB of the working belong to src buffer
               {     //load LSB form exisying flash
                  LSB(temp16)=flash_rd_byte((U8 farcode*)address+1);
               }
            }
            else  //current word addr out of dst target
            {     //load MSB from existing flash
               MSB(temp16)=flash_rd_byte((U8 farcode*)address);
               if(address+1==dst) // Is LSB word addr in dst range ?
               {
                  LSB(temp16)=(*(U8*)src);
                  src++; n--;
               }
               else // LSB read from existing flash
               {
                  LSB(temp16)=flash_rd_byte((U8 farcode*)address+1);
               }
            }
         }
         else  //complete page with words from existing flash
         {
            temp16=flash_rd_word((U16 farcode*)address);
         }
         //Load temp buffer
         (*boot_flash_fill_temp_buffer)(temp16,address);
         address+=2;
      }
      address=save_page_adr;
      for(nb_word=0;nb_word<FLASH_PAGE_SIZE/2;nb_word++)
      {
         if(flash_rd_word((U16 farcode*)address)!=0xFFFF) //Check for Blank page
         {
            page_is_blank=FALSE;
            break;
         }
         address+=2;
      }
      // Now launch prog sequence (with or without page erase)
      address=save_page_adr;
      if(page_is_blank)  { (*boot_flash_prg_page)(save_page_adr); }
      else{(*boot_flash_page_erase_and_write)(save_page_adr);}
      //- First Flash address update for the next page
      address = save_page_adr + FLASH_PAGE_SIZE;
   }
   return TRUE;
}


U8 flash_rd_byte(U8 farcode* addr)
{
  unsigned char temp;
  Enable_flash();
  temp = *addr;
  Disable_flash();
  return temp;
}

U16 flash_rd_word(U16 farcode* addr)
{
  Union16 temp;
  Enable_flash();
  temp.b[1] = flash_rd_byte ((Uchar farcode*) addr);
  temp.b[0] = flash_rd_byte ((Uchar farcode*)addr+1);
  Disable_flash();
  return temp.w;
}