#include "includes.h"

////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 STMFLASH_ReadHalfWord(uint32_t faddr)
{
    return *(volatile uint16_t*)faddr; 
}
////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 STMFLASH_Read(uint32_t ReadAddr,uint16_t *pBuffer,uint16_t NumToRead)   	
{
    uint16_t i;
    for(i=0;i<NumToRead;i++)
    {
        pBuffer[i]=STMFLASH_ReadHalfWord(ReadAddr);//读取2个字节.
        ReadAddr+=2;//偏移2个字节.	
    }
}

/**********************************************************************************************************
*写页数据，擦除整页1024字节，并写入Byte数据，数据可少于1024Btye，但必须是偶数。
************************************************************************************************************/
void WritePageData(unsigned long WriteAddr,unsigned char *pData,unsigned short DataLen)
{
  uint32_t First_Page;
	uint32_t EraseCounter;
	unsigned short i;
	unsigned short datas;
	FLASH_Status status;
	FLASH_Unlock();//先解锁
  FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPERR); //清楚相应的标志位
	if(WriteAddr<FLASH_Start_Addr || WriteAddr>=FLASH_End_Addr) return;//非法地址

	if(WriteAddr&0x0000003FF)return;//非页首地址
	status=FLASH_ErasePage(WriteAddr);//擦除这个页
	if(status!=FLASH_COMPLETE){
		return;
	}
	
  /* 写入FLASH */
	for(i = 0; i < DataLen; i+=2)
	{
		//数据8位融合为16位
		datas = (((unsigned short)pData[i+1])<<8) + ((unsigned short)pData[i]);
		FLASH_ProgramHalfWord((WriteAddr+i),datas);
	}	
	/* 上锁 */
  FLASH_Lock();
}

/**********************************************************************************************************

************************************************************************************************************/
void ReadFlashData(unsigned long ReadAddr,unsigned char *pData,unsigned short DataLen)
{
	unsigned int i,j;
	unsigned short temp;
	j=0;
	for(i=0;i<DataLen;i+=2)
	{
		temp=STMFLASH_ReadHalfWord(ReadAddr+i);
		pData[j++]=(unsigned char)(temp&0xff);
		pData[j++]=(temp>>8)&0xff;
	}	
}