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- #include "flash.h"
- #include "stm32f10x.h"
- #if FLASH_SIZE<256
- #define SECTOR_SIZE 1024 //字节
- #else
- #define SECTOR_SIZE 2048
- #endif
- uint16_t FLASH_BUF[SECTOR_SIZE/2];//最多是2K字节
- //读取指定地址的半字(16位数据)
- //faddr:读地址(此地址必须为2的倍数!!)
- //返回值:对应数据.
- uint16_t FLASH_ReadHalfWord(uint32_t faddr)
- {
- return *(uint16_t*)faddr;
- }
- //不检查的写入
- //WriteAddr:起始地址
- //pBuffer:数据指针
- //NumToWrite:半字(16位)数
- void FLASH_Write_NoCheck(uint32_t WriteAddr,uint16_t *pBuffer,uint16_t NumToWrite)
- {
- uint16_t i;
- for(i=0;i<NumToWrite;i++)
- {
- FLASH_ProgramHalfWord(WriteAddr,pBuffer[i]);
- WriteAddr+=2;//地址增加2.
- }
- }
- //从指定地址开始写入指定长度的数据
- //WriteAddr:起始地址(此地址必须为2的倍数!!)
- //pBuffer:数据指针
- //NumToWrite:半字(16位)数(就是要写入的16位数据的个数.)
- void FLASH_Write(uint32_t WriteAddr,uint16_t *pBuffer,uint16_t NumToWrite)
- {
- uint32_t secpos; //扇区地址
- uint16_t secoff; //扇区内偏移地址(16位字计算)
- uint16_t secremain; //扇区内剩余地址(16位字计算)
- uint16_t i;
- uint32_t offaddr; //去掉0X08000000后的地址
-
- if(WriteAddr<FLASH_BASE||(WriteAddr>=(FLASH_BASE+1024*FLASH_SIZE)))
- return; //非法地址
- FLASH_Unlock(); //解锁
- offaddr=WriteAddr-FLASH_BASE; //实际偏移地址.
- secpos=offaddr/SECTOR_SIZE; //扇区地址 0~512
- secoff=(offaddr%SECTOR_SIZE)/2; //在扇区内的偏移(2个字节为基本单位.)
- secremain=SECTOR_SIZE/2-secoff; //扇区剩余空间大小
- if(NumToWrite<=secremain)
- secremain=NumToWrite;//不大于该扇区范围
- while(1)
- {
- FLASH_Read(secpos*SECTOR_SIZE+FLASH_BASE,FLASH_BUF,SECTOR_SIZE/2);//读出整个扇区的内容
- for(i=0;i<secremain;i++)//校验数据
- {
- if(FLASH_BUF[secoff+i]!=0XFFFF)
- break;//需要擦除
- }
- if(i<secremain)//需要擦除
- {
- FLASH_ErasePage(secpos*SECTOR_SIZE+FLASH_BASE);//擦除这个扇区
- for(i=0;i<secremain;i++)//复制
- {
- FLASH_BUF[i+secoff]=pBuffer[i];
- }
- FLASH_Write_NoCheck(secpos*SECTOR_SIZE+FLASH_BASE,FLASH_BUF,SECTOR_SIZE/2);//写入整个扇区
- }
- else
- {
- FLASH_Write_NoCheck(WriteAddr,pBuffer,secremain);//写已经擦除了的,直接写入扇区剩余区间.
- }
- if(NumToWrite==secremain)
- break;//写入结束了
- else//写入未结束
- {
- secpos++; //扇区地址增1
- secoff=0; //偏移位置为0
- pBuffer+=secremain; //指针偏移
- WriteAddr+=(secremain*2); //写地址偏移
- NumToWrite-=secremain; //字节(16位)数递减
- if(NumToWrite>(SECTOR_SIZE/2))
- secremain=SECTOR_SIZE/2;//下一个扇区还是写不完
- else
- secremain=NumToWrite;//下一个扇区可以写完了
- }
- }
- FLASH_Lock();//上锁
- }
- //从指定地址开始读出指定长度的数据
- //ReadAddr:起始地址
- //pBuffer:数据指针
- //NumToWrite:半字(16位)数
- void FLASH_Read(uint32_t ReadAddr,uint16_t *pBuffer,uint16_t NumToRead)
- {
- uint16_t i;
-
- for(i=0;i<NumToRead;i++)
- {
- pBuffer[i]=FLASH_ReadHalfWord(ReadAddr);//读取2个字节.
- ReadAddr+=2;//偏移2个字节.
- }
- }
- void FLASH_Write_2KB(uint32_t WriteAddr, uint8_t *pBuffer)
- {
- u16 i, WriteData;
- INTX_DISABLE();
- FLASH_Unlock();
- FLASH_ErasePage(WriteAddr);
- if(FLASH_SIZE<0x100) //1KB/P
- FLASH_ErasePage(WriteAddr+1024);
- for(i=0; i<2048; i+=2)
- {
- WriteData = (pBuffer[i+1]<<8) + pBuffer[i];
- FLASH_ProgramHalfWord(WriteAddr, WriteData);
- WriteAddr+=2;
- }
-
- FLASH_Lock();
- INTX_ENABLE();
- }
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