STM32F单片机FLASH读写函数

作者：陈贞_Rock

转自：http://blog.chinaunix.net/uid-26729065-id-3419459.html

头文件： 文件名：FLASH.h

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1. #ifndef __FLASH_H__
   
2. #define __FLASH_H__
   
3. 
   
4. 
   
5. #include "stm32f10x.h"
   
6. #include "stm32f10x_flash.h"
   
7. 
   
8. 
   
9. 
   
10. 
    
11. #if defined (STM32F10X_HD)|| defined(STM32F10X_HD_VL)|| defined (STM32F10X_CL)|| defined(STM32F10X_XL)
    
12. #define FLASH_PAGE_SIZE ((uint16_t)0x800)
    
13. 
    
14. #else
    
15. #define FLASH_PAGE_SIZE ((uint16_t)0x400)
    
16. #endif
    
17. 
    
18. 
    
19. 
    
20. 
    
21. int Flash_Read(uint32_t iAddress, uint8_t*buf, int32_t iNbrToRead);
    
22. int Flash_Write(uint32_t iAddress, uint8_t*buf, uint32_t iNbrToWrite);
    
23. 
    
24. 
    
25. #endif

源文件:

文件名：FLASH.c

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1. #include "FLASH.h"
   
2. 
   
3. uint16_t Flash_Write_Without_check(uint32_t iAddress, uint8_t*buf, uint16_t iNumByteToWrite)
   
4. {
   
5.     uint16_t i;
   
6.     volatile FLASH_Status FLASHStatus = FLASH_COMPLETE;
   
7.     i = 0;
   
8. 
   
9.     // FLASH_UnlockBank1();
   
10.     while((i< iNumByteToWrite)&&(FLASHStatus== FLASH_COMPLETE))
    
11.     {
    
12.         FLASHStatus = FLASH_ProgramHalfWord(iAddress,*(uint16_t*)buf);
    
13.         i = i+2;
    
14.         iAddress = iAddress + 2;
    
15.         buf = buf + 2;
    
16.     }
    
17. 
    
18.     return iNumByteToWrite;
    
19. }
    
20. /**
    
21. * @brief Programs a half word at a specifiedOption Byte Data address.
    
22. * @note This function can be usedfor all STM32F10x devices.
    
23. * @param Address: specifies the addressto be programmed.
    
24. * @param buf: specifies the datato be programmed.
    
25. * @param iNbrToWrite: the numberto write into flash
    
26. * @retval if success return the numberto write,-1iferror
    
27. *
    
28. */
    
29. int Flash_Write(uint32_t iAddress, uint8_t*buf, uint32_t iNbrToWrite)
    
30. {
    
31.     /* Unlock the Flash Bank1 ProgramErase controller*/
    
32.     uint32_t secpos;
    
33.     uint32_t iNumByteToWrite = iNbrToWrite;
    
34.     uint16_t secoff;
    
35.     uint16_t secremain;
    
36.     uint16_t i = 0;
    
37.     uint8_t tmp[FLASH_PAGE_SIZE];
    
38. 
    
39.     FLASH_UnlockBank1();
    
40.     secpos=iAddress & (~(FLASH_PAGE_SIZE-1));//扇区地址
    
41.     secoff=iAddress & (FLASH_PAGE_SIZE -1);//在扇区内的偏移
    
42.     secremain=FLASH_PAGE_SIZE-secoff;//扇区剩余空间大小
    
43.     volatile FLASH_Status FLASHStatus = FLASH_COMPLETE;
    
44. 
    
45.     if(iNumByteToWrite<=secremain) secremain= iNumByteToWrite;//不大于4096个字节
    
46. 
    
47.     while( 1)
    
48.     {
    
49.         Flash_Read(secpos, tmp, FLASH_PAGE_SIZE);//读出整个扇区
    
50.         for(i=0;i<secremain;i++)
    
51.         { //校验数据
    
52.             if(tmp[secoff+i]!=0XFF)break;//需要擦除
    
53.         }
    
54.         if(i<secremain)
    
55.         { //需要擦除
    
56.             FLASHStatus = FLASH_ErasePage(secpos);//擦除这个扇区
    
57.             if(FLASHStatus!= FLASH_COMPLETE)
    
58.             return -1;
    
59.             for(i=0;i<secremain;i++)//复制
    
60.             {
    
61.                 tmp[i+secoff]=buf[i];
    
62.             }
    
63.             Flash_Write_Without_check(secpos,tmp,FLASH_PAGE_SIZE);//写入整个扇区
    
64.         }
    
65.         else
    
66.         {
    
67.             Flash_Write_Without_check(iAddress,buf,secremain);//写已经擦除了的,直接写入扇区剩余区间.
    
68.         }
    
69. 
    
70.         if(iNumByteToWrite==secremain)//写入结束了
    
71.         {
    
72.             break;
    
73.         }
    
74.         else
    
75.         {
    
76.             secpos += FLASH_PAGE_SIZE;
    
77.             secoff = 0;//偏移位置为0
    
78.             buf += secremain;//指针偏移
    
79.             iAddress += secremain;//写地址偏移
    
80.             iNumByteToWrite -= secremain;//字节数递减
    
81.             if(iNumByteToWrite>FLASH_PAGE_SIZE) secremain=FLASH_PAGE_SIZE;//下一个扇区还是写不完
    
82.             else secremain = iNumByteToWrite; //下一个扇区可以写完了
    
83.         }
    
84.     }
    
85.     FLASH_LockBank1();
    
86.     return iNbrToWrite;
    
87. }
    
88. 
    
89. 
    
90. 
    
91. 
    
92. 
    
93. 
    
94. /**
    
95. * @brief Programs a half word at a specifiedOption Byte Data address.
    
96. * @note This function can be usedfor all STM32F10x devices.
    
97. * @param Address: specifies the addressto be programmed.
    
98. * @param buf: specifies the datato be programmed.
    
99. * @param iNbrToWrite: the numberto read from flash
    
100. * @retval if success return the numberto write, withouterror
     
101. *
     
102. */
     
103. int Flash_Read(uint32_t iAddress, uint8_t*buf, int32_t iNbrToRead)
     
104. {
     
105.     int i = 0;
     
106.     while(i< iNbrToRead)
     
107.     {
     
108.         *(buf+ i)=*(__IO uint8_t*) iAddress++;
     
109.         i++;
     
110.     }
     
111.     return i;
     
112. }