flash_lib.c File Reference

#include "config.h"
#include "flash.h"
#include "flash_lib.h"

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Defines

#define Enable_flash()
#define Disable_flash()

Functions

Bool flash_lib_check (void)
 This function checks the presence of bootloader.
void flash_wr_byte (Uint32 addr_byte, Uchar value)
 This function allows to write a byte in the flash memory.
Uchar flash_wr_block (Byte _MemType_ *src, Uint32 dst, U16 n)
 This function allows to write up to 65535 bytes in the flash memory.
U8 flash_rd_byte (U8 farcode *addr)
 This function allows to read a byte in the flash memory.
U16 flash_rd_word (U16 farcode *addr)
 This function allows to read a word in the flash memory.

Variables

void(* boot_flash_page_erase_and_write )(unsigned long adr) = (void (*)(unsigned long))( (((FLASH_END+1)/2)-2) -12)
U8(* boot_flash_read_sig )(unsigned long adr) = (U8 (*)(unsigned long))( (((FLASH_END+1)/2)-2) -10)
U8(* boot_flash_read_fuse )(unsigned long adr) = (U8 (*)(unsigned long))( (((FLASH_END+1)/2)-2) -8)
void(* boot_flash_fill_temp_buffer )(unsigned int data, unsigned int adr) = (void (*)(unsigned int, unsigned int))( (((FLASH_END+1)/2)-2) -6)
void(* boot_flash_prg_page )(unsigned long adr) = (void (*)(unsigned long))( (((FLASH_END+1)/2)-2) -4)
void(* boot_flash_page_erase )(unsigned long adr) = (void (*)(unsigned long))( (((FLASH_END+1)/2)-2) -2)
void(* boot_lock_wr_bits )(unsigned char val) = (void (*)(unsigned char))( (((FLASH_END+1)/2)-2) )

Detailed Description

This file contains a set of routines to perform flash access.

Author:
Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file flash_lib.c.

Define Documentation

 
#define Enable_flash (  ) 

Definition at line 54 of file flash_lib.c.

Referenced by flash_rd_byte(), flash_rd_word(), and flash_wr_byte().

 
#define Disable_flash (  ) 

Definition at line 55 of file flash_lib.c.

Referenced by flash_rd_byte(), flash_rd_word(), and flash_wr_byte().

Function Documentation

Bool flash_lib_check ( void   ) 

This function checks the presence of bootloader.

Returns:
FALSE, if no code loaded in bootloader area

Definition at line 75 of file flash_lib.c.

Referenced by launch_test().

00076 {
00077    return (*((code U16*)((U32)boot_flash_page_erase_and_write*2)) != 0xFFFF);
00078 }

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void flash_wr_byte ( Uint32  addr_byte,
Uchar  value 
)

This function allows to write a byte in the flash memory.

Parameters:
addr_byte Address in flash memory to write the byte.
value Value to write in the flash memory

Definition at line 86 of file flash_lib.c.

00087 {
00088    Enable_flash();
00089    flash_wr_block(&value, addr_byte, 1);
00090    Disable_flash();
00091 }

Uchar flash_wr_block ( Byte _MemType_ *  src,
Uint32  dst,
U16  n 
)

This function allows to write up to 65535 bytes in the flash memory.

This function manages alignement issue.

Parameters:
src Address of data to write.
dst Start address in flash memory where write data
n number of byte to write

Definition at line 101 of file flash_lib.c.

Referenced by flash_wr_byte(), and launch_test().

00102 {
00103    U16 nb_word, temp16;
00104    U32 address;
00105    U32 save_page_adr;
00106    U8 page_is_blank;
00107 
00108    while(n)                                     // While there is data to load from src buffer
00109    {
00110       page_is_blank=TRUE;
00111       address=dst-(LOW(dst)%FLASH_PAGE_SIZE);   // Compute the start of the page to be modified
00112       save_page_adr=address;                    // Memorize page addr
00113 
00114       // For each word in this page
00115       for(nb_word=0;nb_word<FLASH_PAGE_SIZE/2;nb_word++)
00116       {
00117          if(n)                                  // Still some data to load from src
00118          {
00119             if(address>=dst)                    // Current address is inside the target range adr
00120             {
00121                MSB(temp16)=(*(U8*)src);         // Load MSB of word from buffer src
00122                src++; n--;
00123                if(n)                            // Still some data to load ?
00124                {
00125                   LSB(temp16)=(*(U8*)src);      // Load LSB of word from buffer src
00126                   src++; n--;
00127                }
00128                else                             // Only the MSB of the working belong to src buffer
00129                {                                // Load LSB form exisying flash
00130                   LSB(temp16)=flash_rd_byte((U8 farcode*)address+1);
00131                }
00132             }
00133             else                                // Current word addr out of dst target
00134             {                                   // Load MSB from existing flash
00135                MSB(temp16)=flash_rd_byte((U8 farcode*)address);
00136                if(address+1==dst)               // Is LSB word addr in dst range ?
00137                {
00138                   LSB(temp16)=(*(U8*)src);
00139                   src++; n--;
00140                }
00141                else                             // LSB read from existing flash
00142                {
00143                   LSB(temp16)=flash_rd_byte((U8 farcode*)address+1);
00144                }
00145             }
00146          }
00147          else                                   // Complete page with words from existing flash
00148          {
00149             temp16=flash_rd_word((U16 farcode*)address);
00150          }
00151          //Load temp buffer
00152          (*boot_flash_fill_temp_buffer)(temp16,address);
00153          address+=2;
00154       }
00155       address=save_page_adr;
00156       for(nb_word=0;nb_word<FLASH_PAGE_SIZE/2;nb_word++)
00157       {
00158          if(flash_rd_word((U16 farcode*)address)!=0xFFFF)   // Check for Blank page
00159          {
00160             page_is_blank=FALSE;
00161             break;
00162          }
00163          address+=2;
00164       }
00165       // Now launch prog sequence (with or without page erase)
00166       address=save_page_adr;
00167       if(page_is_blank)  { (*boot_flash_prg_page)(save_page_adr); }
00168       else{(*boot_flash_page_erase_and_write)(save_page_adr);}
00169       //- First Flash address update for the next page
00170       address = save_page_adr + FLASH_PAGE_SIZE;
00171    }
00172    return TRUE;
00173 }

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U8 flash_rd_byte ( U8 farcode *  addr  ) 

This function allows to read a byte in the flash memory.

Parameters:
*add Address of flash memory to read.
Returns:
byte Read value

Definition at line 181 of file flash_lib.c.

Referenced by flash_rd_word(), and flash_wr_block().

00182 {
00183    unsigned char temp;
00184    Enable_flash();
00185    temp = *addr;
00186    Disable_flash();
00187    return temp;
00188 }

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U16 flash_rd_word ( U16 farcode *  addr  ) 

This function allows to read a word in the flash memory.

Parameters:
*add Address of flash memory to read.
Returns:
word Read value

Definition at line 196 of file flash_lib.c.

Referenced by flash_wr_block().

00197 {
00198    Union16 temp;
00199    Enable_flash();
00200    temp.b[1] = flash_rd_byte ((Uchar farcode*) addr);
00201    temp.b[0] = flash_rd_byte ((Uchar farcode*)addr+1);
00202    Disable_flash();
00203    return temp.w;
00204 }

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Variable Documentation

void(* boot_flash_page_erase_and_write)(unsigned long adr) = (void (*)(unsigned long))( (((FLASH_END+1)/2)-2) -12)

Definition at line 59 of file flash_lib.c.

Referenced by flash_lib_check().

U8(* boot_flash_read_sig)(unsigned long adr) = (U8 (*)(unsigned long))( (((FLASH_END+1)/2)-2) -10)

Definition at line 60 of file flash_lib.c.

U8(* boot_flash_read_fuse)(unsigned long adr) = (U8 (*)(unsigned long))( (((FLASH_END+1)/2)-2) -8)

Definition at line 61 of file flash_lib.c.

void(* boot_flash_fill_temp_buffer)(unsigned int data, unsigned int adr) = (void (*)(unsigned int, unsigned int))( (((FLASH_END+1)/2)-2) -6)

Definition at line 62 of file flash_lib.c.

void(* boot_flash_prg_page)(unsigned long adr) = (void (*)(unsigned long))( (((FLASH_END+1)/2)-2) -4)

Definition at line 63 of file flash_lib.c.

void(* boot_flash_page_erase)(unsigned long adr) = (void (*)(unsigned long))( (((FLASH_END+1)/2)-2) -2)

Definition at line 64 of file flash_lib.c.

void(* boot_lock_wr_bits)(unsigned char val) = (void (*)(unsigned char))( (((FLASH_END+1)/2)-2) )

Definition at line 65 of file flash_lib.c.

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