上一篇講到內(nèi)部Flash的讀寫(xiě)，本篇講述使用D-Flash模擬EEPROM。其實(shí)使用P-Flash也可以模擬，只不過(guò)D-Flash的Page更小（擦除復(fù)寫(xiě)占用更少時(shí)間），而且不會(huì)占用代碼空間。

最近剛換工作，一直比較忙，更新會(huì)比較慢。若是需要源碼可自行下載：https://download.csdn.net/download/u010875635/11435913

沒(méi)有積分可以自己新建工程，下面的代碼基本可以直接使用。

本篇關(guān)于Flash讀寫(xiě)就不在贅述，跟PFlash除了Sector大小和指令不同，其余一致，后面直接貼出代碼。

模擬EEPROM其實(shí)就是模擬其單字節(jié)讀寫(xiě)功能，原理就是要修改某個(gè)Sector內(nèi)某個(gè)字節(jié)的數(shù)據(jù)時(shí)，先讀出這個(gè)扇區(qū)內(nèi)所有數(shù)據(jù)（256Bytes）到數(shù)組，然后擦除這個(gè)Sector，再在RAM中修改那個(gè)字節(jié)的數(shù)據(jù)，最后將這個(gè)數(shù)組寫(xiě)回該扇區(qū)。修改多字節(jié)數(shù)據(jù)原理相似。

另外大家可以想一下，若是要往EEPROM中寫(xiě)入跨Sector的數(shù)組怎么辦？（需要判斷數(shù)組地址范圍）

使用范例：

main.c

#include       /* common defines and macros */

#include "derivative.h"      /* derivative-specific definitions */

#include "Typedefs.h"

#include "gpio.h"

#include "System.h"

#include "flash.h"

#include "EmulationEEPROM.h"

UINT32 m_maincount=0;

void main(void) 

{

  /* put your own code here */

  int result;

  UINT32 index = 0;

  UINT32 globalDFlashAddr1 = 0x100000,globalDFlashAddr2 = 0x100002,globalDFlashAddr3=0x13F800;

  UINT32 globalAddr1 = 0x7F4000,globalAddr2 = 0x7F4002,globalAddr3=0x7db460;

  UINT8 datas1[] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F};

  UINT8 datas2[] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09};

  UINT8 readDatas[100];

    McuDrivers_System_Init();

    McuDrivers_GPIO_Init();

EnableInterrupts;

//for(index = 0;index<129;index++)

//    HDL_Flash_PFlash_ProgramMultiSectors(globalAddr2+index*8,datas,sizeof(datas));

//HDL_Flash_PFlash_EraseOneSector(0x7F4000);    

// HDL_Flash_PFlash_EraseMultiSectors(globalAddr2,globalAddr2+1001); 

//IFsh1_EraseSector(globalAddr2);

//HDL_Flash_PFlash_ProgramMultiSectors(globalAddr1,datas,sizeof(datas));

//HDL_Flash_PFlash_ProgramMultiSectors(globalAddr3,datas2,sizeof(datas2));

    //HDL_Flash_DFlash_EraseMultiSectors(globalDFlashAddr1,globalDFlashAddr1+1000);

    //for(index = 0;index<33;index++)

//    HDL_Flash_DFlash_ProgramMultiSectors(globalDFlashAddr1+index*16,datas1,sizeof(datas1));

    //HDL_Flash_DFlash_EraseMultiSectors(globalDFlashAddr1,globalDFlashAddr1+1000);

    //HDL_Flash_DFlash_ProgramMultiSectors(globalDFlashAddr2,datas1,sizeof(datas1));

    result = HAL_EEE_ChangeValue(globalDFlashAddr1,datas1,sizeof(datas1));

    result = HAL_EEE_ChangeValue(globalDFlashAddr1+10,datas1,sizeof(datas1));

    HAL_EEE_GetValue(globalDFlashAddr1,30,readDatas);

  for(;;) 

  {

     m_maincount++;

     if(m_maincount>100000)

     {

        m_maincount = 0;

         PORTB_PB0 ^=1;

     }

    _FEED_COP(); /* feeds the dog */

  } /* loop forever */

  /* please make sure that you never leave main */

}

EmulationEEPROM.h

#ifndef _HAL_EmulationEEPROM_H_

#define _HAL_EmulationEEPROM_H_

#include "Typedefs.h"

//get value

int HAL_EEE_GetValue(UINT32 startGlobalAddr, UINT8 newDataLength, UINT8 * pNewData);

//change value

int HAL_EEE_ChangeValue(UINT32 startGlobalAddr, UINT8 * pNewData,UINT8 newDataLength);

#endif

EmulationEEPROM.c

#include "EmulationEEPROM.h"

#include "flash.h"

#define DFLASH_SECTOR_ADDR_MASK 0xFFFFFF00 //256 bytes

#define DFLASH_SECTOR_SIZE 256U

#define PROGRAM_DFlash_Phrase_SIZE 8U

#define PROGRAM_DFlash_Phrase_MASK 0xFFFFFFF8

//get value

int HAL_EEE_GetValue(UINT32 startGlobalAddr, UINT8 newDataLength, UINT8 * pNewData)

{

    UINT16 i;

    UINT8 *far readTmpData;

     //讀取DFlash中內(nèi)容

     for(i=0;i     {

        readTmpData = (UINT8 *far)(startGlobalAddr+i);

        pNewData[i] = (*readTmpData); 

     }

}

//change value

int HAL_EEE_ChangeValue(UINT32 startGlobalAddr, UINT8 * pNewData,UINT8 newDataLength)

{

     UINT32 sectorStartAddr = startGlobalAddr&DFLASH_SECTOR_ADDR_MASK;

     UINT8 dataContainer[DFLASH_SECTOR_SIZE]={0};

     UINT16 *far readTmpData;

     UINT16 i;

     volatile int result = 0;

     //讀取DFlash中此扇區(qū)內(nèi)容

     for(i=0;i     {

        readTmpData = (UINT16 *far)(sectorStartAddr+i);

        dataContainer[i] =  ((*readTmpData)>>8)&0xFF;  //高位在前

        dataContainer[i+1] = (*readTmpData)&0xFF; 

     }

     //更新要寫(xiě)入的內(nèi)容

     for(i=startGlobalAddr-sectorStartAddr;i        dataContainer[i] =  pNewData[i-startGlobalAddr+sectorStartAddr];

     result = HDL_Flash_DFlash_EraseMultiSectors(sectorStartAddr,sectorStartAddr);

     result = HDL_Flash_DFlash_ProgramMultiSectors(sectorStartAddr,dataContainer,DFLASH_SECTOR_SIZE);

    return result;

}

flash.h

#ifndef _HDL_FLASH_H_

#define _HDL_FLASH_H_

#define FLASH_BOOT_SEQUENCE_ERROR (-2)

#define FLASH_ADDRESS_ERROR (-3)

#define FLASH_ERASE_ERROR (-4)

#define FLASH_PROGRAM_ERROR (-5)

#define FLASH_VERIFICATION_ERROR (-6)

#define FLASH_DATALENGTH_ERROR              (-8)

#define FLASH_NOTAVAIL_ERROR                (-9)

#define FLASH_PROTECTED_ERROR               (-10)

#define FLASH_MGSTAT_ERROR                  (-11)

#define FLASH_BUSY_ERROR                    (-12)

#define FLASH_SUCCESS (1)

//erase multiple sector

int HDL_Flash_DFlash_EraseMultiSectors(UINT32 startGlobalAddr, UINT32 endGlobalAddr);

//program multiple phrases

int HDL_Flash_DFlash_ProgramMultiSectors(UINT32 globalAddr, UINT8 * pData,UINT16 dataLength);

//erase multiple sector

int HDL_Flash_PFlash_EraseMultiSectors(UINT32 startGlobalAddr, UINT32 endGlobalAddr);

//program multiple phrases

int HDL_Flash_PFlash_ProgramMultiSectors(UINT32 globalAddr, UINT8 * pData,UINT16 dataLength);

#endif

flash.c

#include       /* common defines and macros */

#include "derivative.h"      /* derivative-specific definitions */

#include "Typedefs.h"

#include "flash.h"

#include "string.h"

/*

默認(rèn)情況下（ROMHM=0 RAMHM=0）Global Memory Map 如下：

0x000000-0x0007FF Registers 2KB

0x000800-0x000FFF 2K RAM , 擴(kuò)展空間CS3

0x001000-0x0FDFFF 253*4K Paged RAM

0x0FE000-0x0FFFFF 8K RAM（2*4K）

0x100000-0x13FBFF 255*1K Paged EEPROM

0x100000-0x1003FF 1K (EPAGE 0x00)

……

0x103C00-0x103FFF 1K (EPAGE 0x1F)

---

0x13F000-0x13F3FF 1K (EPAGE 0xFC) --

0x13F400-0x13F7FF 1K (EPAGE 0xFD) | RAM Bufferd

0x13F800-0x13FBFF 1K (EPAGE 0xFE) |

0x13FC00-0x13FFFF 1K EEPROM(EPAGE 0xFF) --

0x140000-0x1FFFFF 擴(kuò)展空間CS2

0x200000-0x3FFFFF 擴(kuò)展空間CS1

0x400000-0x7F3FFF 253*16K Paged Flash, 擴(kuò)展空間CS0

0x700000-0x73FFFF B3(256KB)

0x740000-0x77FFFF B2(256KB)

0x780000-0x79FFFF B1S(128KB)

0x7A0000-0x7BFFFF B1N(128KB)

0x7C0000-0x7F3FFF B0(208KB)

0x7F4000-0x7F7FFF 16KB Flash(PPAGE 0xFD)

0x7F4000-0x7F7FFF B0(16KB)

0x7F8000-0x7FBFFF 16KB Flash(PPAGE 0xFE)

0x7F8000-0x7FBFFF B0(16KB)

0x7FC000-0x7FFFFF 16KB Flash(PPAGE 0xFF)

0x7FC000-0x7FFFFF B0(16KB)

*/

/**** P-Flash and D-Flash Commands ****/

#define ERASE_VERIFY_ALL_BLOCKS  0x01 

/* Verify that all program and data Flash blocks are erased. */

/* CCOBIX end = 0 */

/* CCOB Params - NONE */

/* MGSTAT set if fault */

#define ERASE_VERIFY_BLOCK       0x02      

/* Verify that a Flash block is erased. */

/* CCOBIX end = 0 */

/* CCOB Params - gpage */

/* MGSTAT set if fault */

#define ERASE_ALL_BLOCKS         0x08 

/* Erase all program and data Flash blocks.

   An erase of all Flash blocks is only possible when the FPLDIS, FPHDIS, and FPOPEN

   bits in the FPROT register and the EPDIS and EPOPEN bits in the EPROM register are

   set prior to launching the command. */

/* CCOBIX end = 0 */

/* CCOB Params - NONE */

/* MGSTAT set if fault, FPVIOL / ACCERR set where appropriate */

#define UNSECURE_FLASH           0x0B 

/*Supports a method of releasing MCU security by erasing all program and data Flash

  blocks and verifying that all program and data Flash blocks are erased. */

/* CCOBIX end = 0 */

/* CCOB Params - NONE */

/* MGSTAT set if fault */

#define SET_USER_MARGIN_LEVEL    0x0D 

/*Specifies a user margin read level for all program Flash blocks. */

/* CCOBIX end = 1 */

/* CCOB Params - gpage, level setting (0-2) in CCOB[1] */

/* ACCERR set if invalid level */

#define SET_FIELD_MARGIN_LEVEL   0x0E 

/*Specifies a field margin read level for all program Flash blocks (special modes only). */

/* CCOBIX end = 1 */

/* CCOB Params - gpage, level setting (0-4) in CCOB[1] */

/* ACCERR set if invalid level */

/*-------------------------------*/

/* **** P-Flash Only Commands ****/

#define ERASE_VERIFY_P_FLASH_SECTION 0x03  

/*Verify that a given number of words starting at the address provided are erased. */

/* CCOBIX end = 2 */

/* CCOB Params - global address, number of phrases in CCOB[2]*/