1. 讀取半字（16位）函數(shù)
//讀取指定地址的半字(16位數(shù)據(jù))
//faddr:讀地址(此地址必須為2的倍數(shù)!!)
//返回值:對(duì)應(yīng)數(shù)據(jù).
u16 STMFLASH_ReadHalfWord(u32 faddr)
{
return *(vu16*)faddr;
}
2. 不進(jìn)行檢查的直接寫(xiě)入
//不檢查的寫(xiě)入
//WriteAddr:起始地址
//pBuffer:數(shù)據(jù)指針
//NumToWrite:半字(16位)數(shù)
void STMFLASH_Write_NoCheck(u32 WriteAddr,u16 *pBuffer,u16 NumToWrite)
{
u16 i;
for(i=0;i
{
FLASH_ProgramHalfWord(WriteAddr,pBuffer[i]);
WriteAddr+=2;//地址增加2.一次寫(xiě)入一個(gè)半字（16位數(shù)）
}
}
3. 從指定地址讀取指定長(zhǎng)度的數(shù)據(jù)
//從指定地址開(kāi)始讀出指定長(zhǎng)度的數(shù)據(jù)
//ReadAddr:起始地址
//pBuffer:數(shù)據(jù)指針
//NumToWrite:半字(16位)數(shù)
void STMFLASH_Read(u32 ReadAddr,u16 *pBuffer,u16 NumToRead)
{
u16 i;
for(i=0;i
{
pBuffer[i]=STMFLASH_ReadHalfWord(ReadAddr);//讀取2個(gè)字節(jié).
ReadAddr+=2;//偏移2個(gè)字節(jié).
}
}
4.從指定地址開(kāi)始寫(xiě)入指定長(zhǎng)度的數(shù)據(jù)
程序的思路
//從指定地址開(kāi)始寫(xiě)入指定長(zhǎng)度的數(shù)據(jù)
//WriteAddr:起始地址(此地址必須為2的倍數(shù)!!)
//pBuffer:數(shù)據(jù)指針
//NumToWrite:半字(16位)數(shù)(就是要寫(xiě)入的16位數(shù)據(jù)的個(gè)數(shù).)
#if STM32_FLASH_SIZE<256
#define STM_SECTOR_SIZE 1024 //字節(jié)
#else
#define STM_SECTOR_SIZE 2048
#endif
u16 STMFLASH_BUF[STM_SECTOR_SIZE/2];//最多是2K字節(jié)
void STMFLASH_Write(u32 WriteAddr,u16 *pBuffer,u16 NumToWrite)
{
u32 secpos; //扇區(qū)地址
u16 secoff; //扇區(qū)內(nèi)偏移地址(16位字計(jì)算)
u16 secremain; //扇區(qū)內(nèi)剩余地址(16位字計(jì)算)
u16 i;
u32 offaddr; //去掉0X08000000后的地址
if(WriteAddr=(STM32_FLASH_BASE+1024*STM32_FLASH_SIZE)))return;//非法地址 ，先確定所要寫(xiě)的地址是不是非法地址
FLASH_Unlock(); //解鎖
offaddr=WriteAddr-STM32_FLASH_BASE; //實(shí)際偏移地址.
secpos=offaddr/STM_SECTOR_SIZE; //扇區(qū)地址 0~127 for STM32F103RBT6，確定在哪個(gè)頁(yè)或扇區(qū)
secoff=(offaddr%STM_SECTOR_SIZE)/2; //在扇區(qū)內(nèi)的偏移(2個(gè)字節(jié)為基本單位.)
secremain=STM_SECTOR_SIZE/2-secoff; //扇區(qū)剩余空間大小
if(NumToWrite<=secremain)secremain=NumToWrite;//不大于該扇區(qū)范圍
while(1)
{
STMFLASH_Read(secpos*STM_SECTOR_SIZE+STM32_FLASH_BASE,STMFLASH_BUF,STM_SECTOR_SIZE/2);//讀出整個(gè)扇區(qū)的內(nèi)容，讀到STMFLASH_BUF中
for(i=0;i
{
if(STMFLASH_BUF[secoff+i]!=0XFFFF)break;//需要擦除
}
if(i上面的校驗(yàn)在中途退出，i一定是小于secremain，否則全部校驗(yàn)成功應(yīng)該是等于secremain.
{
FLASH_ErasePage(secpos*STM_SECTOR_SIZE+STM32_FLASH_BASE);//擦除這個(gè)扇區(qū)
for(i=0;i
{
STMFLASH_BUF[i+secoff]=pBuffer[i]; //把需要更新的數(shù)據(jù)寫(xiě)到數(shù)組
}
STMFLASH_Write_NoCheck(secpos*STM_SECTOR_SIZE+STM32_FLASH_BASE,STMFLASH_BUF,STM_SECTOR_SIZE/2);//寫(xiě)入整個(gè)扇區(qū)
}
elseSTMFLASH_Write_NoCheck(WriteAddr,pBuffer,secremain);//寫(xiě)已經(jīng)擦除了的,直接寫(xiě)入扇區(qū)剩余區(qū)間.
if(NumToWrite==secremain)break;//寫(xiě)入結(jié)束了
else//寫(xiě)入未結(jié)束
{
secpos++; //扇區(qū)地址增1
secoff=0; //偏移位置為0
pBuffer+=secremain; //指針偏移
WriteAddr+=secremain; //寫(xiě)地址偏移
NumToWrite-=secremain; //字節(jié)(16位)數(shù)遞減
if(NumToWrite>(STM_SECTOR_SIZE/2))secremain=STM_SECTOR_SIZE/2;//下一個(gè)扇區(qū)還是寫(xiě)不完
else secremain=NumToWrite;//下一個(gè)扇區(qū)可以寫(xiě)完了
}
};
FLASH_Lock();//上鎖
}
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