有没有可能把STM32的flash里面的某个函数擦除？

比如说:

void fun1(void)

{

//函数内容

}

void fun2(void)

{

//函数内容

}

void fun3(void)

{

//函数内容

}

main()

{

fun1();

fun2();

fun3();

}

此程序编译完之后，下载到STM32的FLASH中去，

fun2的作用是把fun1所在page擦除，并且把fun1();这句话替换成NOP

这样可能实现吗?

我试了很久，都不行

擦除只能擦除程序没用到的page，一旦程序写到flash中，比如说这个程序占用了0x08000000~0x08002000，那么这一段是无论如何都擦写不掉的

只能擦写这后面的

可以擦写的，看看官方的IAP手册，把你要擦除的页读出来，将要改的地方改好再将FLASH该页擦除，然后再讲修改好的写进去就好了。

1. /**
   
2.   ******************************************************************************
   
3.   * [url=home.php?mod=space&uid=1455510]@file[/url]    STM32F0xx_EEPROM_Emulation/inc/eeprom.h
   
4.   * [url=home.php?mod=space&uid=40524]@author[/url]  MCD Application Team
   
5.   * [url=home.php?mod=space&uid=644434]@version[/url] V1.0.0
   
6.   * @date    29-May-2012
   
7.   * @brief   This file contains all the functions prototypes for the EEPROM
   
8.   *          emulation firmware library.
   
9.   ******************************************************************************
   
10.   * @attention
    
11.   *
    
12.   * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
    
13.   *
    
14.   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
    
15.   * You may not use this file except in compliance with the License.
    
16.   * You may obtain a copy of the License at:
    
17.   *
    
18.   *        http://www.st.com/software_license_agreement_liberty_v2
    
19.   *
    
20.   * Unless required by applicable law or agreed to in writing, software
    
21.   * distributed under the License is distributed on an "AS IS" BASIS,
    
22.   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    
23.   * See the License for the specific language governing permissions and
    
24.   * limitations under the License.
    
25.   *
    
26.   ******************************************************************************
    
27.   */
    
28. 
    
29. /* Define to prevent recursive inclusion -------------------------------------*/
    
30. #ifndef __EEPROM_H
    
31. #define __EEPROM_H
    
32. 
    
33. /* Includes ------------------------------------------------------------------*/
    
34. #include "stm32f0xx.h"
    
35. /* Exported constants --------------------------------------------------------*/
    
36. /* Define the size of the sectors to be used */
    
37. #define PAGE_SIZE             ((uint32_t)0x0040)  /* Page size = 1KByte */
    
38. 
    
39. /* EEPROM start address in Flash */
    
40. #define EEPROM_START_ADDRESS  ((uint32_t)0x0800FC00) /* EEPROM emulation start address:
    
41.                                                         from sector2, after 8KByte of used
    
42.                                                         Flash memory */
    
43. 
    
44. /* Exported types ------------------------------------------------------------*/
    
45. /* Exported macro ------------------------------------------------------------*/
    
46. 
    
47. /* Exported functions ------------------------------------------------------- */
    
48. void read_eeprom(__IO word addr, hword len, __IO byte* _Dst);
    
49. bool write_eeprom(__IO word addr, hword len, __IO byte* _Dst);
    
50. 
    
51. #endif /* __EEPROM_H */
    
52. 
    
53. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

1. /**
   
2.   ******************************************************************************
   
3.   * @file    STM32F0xx_EEPROM_Emulation/src/eeprom.c
   
4.   * @author  MCD Application Team
   
5.   * @version V1.0.0
   
6.   * @date    29-May-2012
   
7.   * @brief   This file provides all the EEPROM emulation firmware functions.
   
8.   ******************************************************************************
   
9.   * @attention
   
10.   *
    
11.   * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
    
12.   *
    
13.   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
    
14.   * You may not use this file except in compliance with the License.
    
15.   * You may obtain a copy of the License at:
    
16.   *
    
17.   *        http://www.st.com/software_license_agreement_liberty_v2
    
18.   *
    
19.   * Unless required by applicable law or agreed to in writing, software
    
20.   * distributed under the License is distributed on an "AS IS" BASIS,
    
21.   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    
22.   * See the License for the specific language governing permissions and
    
23.   * limitations under the License.
    
24.   *
    
25.   ******************************************************************************
    
26.   */
    
27. 
    
28. /** @addtogroup STM32F0xx_EEPROM_Emulation
    
29.   * @{
    
30.   */
    
31. 
    
32. /* Includes ------------------------------------------------------------------*/
    
33. #include "eeprom.h"
    
34. 
    
35. /* Private typedef -----------------------------------------------------------*/
    
36. /* Private define ------------------------------------------------------------*/
    
37. /* Private macro -------------------------------------------------------------*/
    
38. /* Private variables ---------------------------------------------------------*/
    
39. /* Private function prototypes -----------------------------------------------*/
    
40. /* Private functions ---------------------------------------------------------*/
    
41. 
    
42. 
    
43. //void read_eeprom (__IO word addr, hword len, __IO byte* _Dst) {
    
44. //        hword i = 0;
    
45. //        word _addr = addr;
    
46. //        //hword _len = len;
    
47. //        _addr += EEPROM_START_ADDRESS;
    
48. //        _addr &= 0xFE;
    
49. //        //_len = (addr & 0x01) + (len | 0x01);
    
50. //        //_len >>= 1;
    
51. //        for (i = 0; i < len; i++) {
    
52. //                *_Dst = (*(__IO uint16_t *)_addr) >> 0;
    
53. //                _addr ++;
    
54. //        }
    
55. //}
    
56. 
    
57. 
    
58. void read_eeprom(__IO word addr, hword len, __IO byte* _Dst) {
    
59.         hword i = 0;
    
60.         byte buf[PAGE_SIZE] = { 0 };
    
61.         for (i = 0; i < (PAGE_SIZE >> 1); i++) {
    
62.                 ((uint16_t*)buf)[i] = ((__IO uint16_t *)EEPROM_START_ADDRESS)[i];
    
63.         }
    
64.         for (i = 0; i < len; i++) {
    
65.                 _Dst[i] = buf[i + addr];
    
66.         }
    
67. }
    
68. 
    
69. 
    
70. bool write_eeprom(__IO word addr, hword len, __IO byte* _Dst) {
    
71.         byte buf[PAGE_SIZE] = { 0 };
    
72.         hword i = 0;
    
73.         bool stat = false;
    
74.         for (i = 0; i < (PAGE_SIZE >> 1); i++) {
    
75.                 ((uint16_t*)buf)[i] = ((__IO uint16_t *)EEPROM_START_ADDRESS)[i];
    
76.         }
    
77.         for (i = 0; i < len; i++) {
    
78.                 buf[addr + i] = _Dst[i];
    
79.         }
    
80. 
    
81.         /* Unlock the Flash to enable the flash control register access *************/
    
82.         FLASH_Unlock();
    
83. 
    
84.         /* Erase the user Flash area
    
85.         (area defined by FLASH_USER_START_ADDR and FLASH_USER_END_ADDR) ***********/
    
86. 
    
87.         /* Clear pending flags (if any) */
    
88.         FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPERR);
    
89. 
    
90. Lable_eeprom_erase:
    
91.         /* Erase the FLASH pages */
    
92.         while (FLASH_ErasePage(EEPROM_START_ADDRESS) ！= FLASH_COMPLETE)
    
93.         {
    
94.                 /* Error occurred while sector erase.
    
95.                 User can add here some code to deal with this error  */
    
96.                 if(stat == false)return false;
    
97.         }
    
98.         /* Program the user Flash area word by word
    
99.         (area defined by FLASH_USER_START_ADDR and FLASH_USER_END_ADDR) ***********/
    
100. 
     
101.         addr = EEPROM_START_ADDRESS;
     
102. 
     
103.         while (addr < EEPROM_START_ADDRESS + PAGE_SIZE)
     
104.         {
     
105.                 if (FLASH_ProgramWord(addr, *((word*)(&buf[addr - EEPROM_START_ADDRESS]))) == FLASH_COMPLETE)
     
106.                 {
     
107.                         addr = addr + 4;
     
108.                 }
     
109.                 else
     
110.                 {
     
111.                         /* Error occurred while writing data in Flash memory.
     
112.                         User can add here some code to deal with this error */
     
113.                         stat = true;
     
114.                         goto Lable_eeprom_erase;
     
115.                 }
     
116.         }
     
117.         FLASH_Lock();
     
118.         return true;
     
119. }
     
120. 
     
121. 
     
122. 
     
123. 
     
124. /**
     
125.   * @}
     
126.   */
     
127. 
     
128. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

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