flash_16x4.c

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name               : flash_16x4.c
//* Object                  : FLASH programmer for :
//*                             AT49BV8011/AT49BV8011T
//*                             AT49BV1604/AT49BV1604T
//*                             AT49BV1614/AT49BV1614T
//*
//* Exported Resources      : at91_flash_identify
//*                           at91_erase_sector
//*                           at91_write_flash
//* Imported Resources      :
//*
//*
//* 1.0 23/04/99 JPP        : Creation
//* 1.1 26/04/00 EL         : Clean up
//*----------------------------------------------------------------------------

#include "flash_16x4.h"

//*----------------------------------------------------------------------------
//* Function Name       : at91_wait_flash_ready
//* Object              : check if data is written
//* Input Parameters    : Data and data address
//* Output Parameters   : TRUE or FALSE
//* Functions called    : none
//*----------------------------------------------------------------------------
static int at91_wait_flash_ready ( flash_word *address, flash_word data )
//* Begin
{
    int count = 0 ;

    //* While two consecutive read don't give same value or timeout
    while (( *address != data ) && ( count++ < TIME_OUT )) ;

    //* If timeout
    if ( count < TIME_OUT )
    {
        //* Return True
        return ( TRUE ) ;
    }
    //* Return False
    return ( FALSE );
//* End
}

//*----------------------------------------------------------------------------
//* Function Name       : at91_flash_identify
//* Object              : Read the flash manufactured code and
//* Input Parameters    : flash_word *load_addr = Flash bass address
//* Output Parameters   : divice code and manufactured code
//* Functions called    : none
//*----------------------------------------------------------------------------
void at91_flash_identify ( flash_word *base_addr, flash_word *manuf_code,flash_word *device_code )
//* Begin
{
    //* Enter Software Product Identification Mode
    *(base_addr + FLASH_SEQ_ADD1) = FLASH_CODE1;
    *(base_addr + FLASH_SEQ_ADD2) = FLASH_CODE2;
    *(base_addr + FLASH_SEQ_ADD1) = ID_IN_CODE;

    //* Read Manufacturer and device code from the device
    *manuf_code  = *base_addr ;
    *device_code = *(base_addr + 1) ;

   //* Exit Software Product Identification Mode
   *(base_addr + FLASH_SEQ_ADD1) = FLASH_CODE1;
   *(base_addr + FLASH_SEQ_ADD2) = FLASH_CODE2;
   *(base_addr + FLASH_SEQ_ADD1) = ID_OUT_CODE;
//* End
}

//*----------------------------------------------------------------------------
//* Function Name       : at91_erase_sector
//* Object              : erase sector
//* Input Parameters    : Data and data address
//* Output Parameters   : TRUE or FALSE
//* Functions called    : at91_wait_flash_ready
//*----------------------------------------------------------------------------
int at91_erase_sector (flash_word *base_addr, flash_word *sector_addr)
//* Begin
{
    //* Enter Sector Erase Sequence codes
    *(base_addr + FLASH_SEQ_ADD1) = FLASH_CODE1;
    *(base_addr + FLASH_SEQ_ADD2) = FLASH_CODE2;
    *(base_addr + FLASH_SEQ_ADD1) = ERASE_SECTOR_CODE1;
    *(base_addr + FLASH_SEQ_ADD1) = FLASH_CODE1;
    *(base_addr + FLASH_SEQ_ADD2) = FLASH_CODE2;
    *sector_addr = ERASE_SECTOR_CODE2 ;

    //* Wait for Flash Ready after Erase, if timeout
    if ( at91_wait_flash_ready ( sector_addr, (flash_word)0xFFFF ) == FALSE )
    {
        //* Display Timeout and return False
        return ( FALSE ) ;
    }
    //* set this sector erased
    //* Return True
    return ( TRUE ) ;
//* End
}

//*----------------------------------------------------------------------------
//* Function Name       : at91_write_flash
//* Object              : write a word in flash
//* Input Parameters    : flash_word *base_addr : Flash base address
//*                       flash_word *load_addr : Flash data address
//*                       flash_word data       : Data value
//* Output Parameters   : error code : FLASH_WRITE_TIME_OUT, FLASH_WRITE_ERROR
//*                       or OK : FLASH_OK
//* Functions called    : at91_wait_flash_ready
//*----------------------------------------------------------------------------
int at91_write_flash ( flash_word *base_addr, flash_word *load_addr,
                       flash_word data )
{
    flash_word  read_data ;

    //* Enter Programming code sequence
    *(base_addr + FLASH_SEQ_ADD1) = FLASH_CODE1 ;
    *(base_addr + FLASH_SEQ_ADD2) = FLASH_CODE2 ;
    *(base_addr + FLASH_SEQ_ADD1) = WRITE_CODE ;
    *load_addr = data ;

    //* Wait for Flash ready after erasing, if timeout
    if ( at91_wait_flash_ready ( load_addr, data ) != TRUE )
    {
        return ( FLASH_WRITE_TIME_OUT ) ;
    }
    //* If Data written does not equal data
    if (( read_data = *load_addr ) != data )
    {
        //* Return False
        return ( FLASH_WRITE_ERROR );
    }
    //* Return OK
    return ( FLASH_OK ) ;
//* End
}

//* End file