/*——————————————————————————
* 文 件 名：Flash.c  
* 作    者：于涛
* 日    期：2014-01-15
* 文件说明：内部FLASH源文件
*——————————————————————————*/
#include "Flash.h"
#include "General.h"
#include "Mem.h"



/*——————————————————————————
* 函 数 名：STM32_FlashPageErase  
* 输入参数：pageAddr  页地址
* 输出参数：None
* 返 回 值：0  成功
      1  失败
* 功能说明：内部FLASH页擦除
*——————————————————————————*/
u8 STM32_FlashPageErase(u32 pageAddr)
{  
  FLASH_Status status = FLASH_COMPLETE;

  FEED_WDG;

  FLASH_Unlock();
  /* Clear All pending flags */
  FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR); 
  //FLHDBG(printf("STM32_FlashPageErase pageAddr = %08x\r\n",pageAddr););
  status = FLASH_ErasePage(pageAddr);

  if(status != FLASH_COMPLETE)
  {
    printf("STM32_FlashPageErase Err pageAddr = %08x status = %d\r\n",pageAddr,status);
    return FLH_ERASE_ERR;
  }

  FLASH_Lock();

  return FLH_SUCCESS;
}

/*——————————————————————————
* 函 数 名：STM32_FlashWrite  
* 输入参数：programAddr    写地址
      pBuffer      写缓冲区
      size      写缓冲区大小
* 输出参数：None
* 返 回 值：0  成功
      >0  失败      
* 功能说明：内部FLASH写操作
*——————————————————————————*/
u8 STM32_FlashWrite(u32 programAddr, u8* pBuffer, u16 size)
{
  u8 sflag;  
  u16 offset = 0,len = size;  
  FLASH_Status status = FLASH_COMPLETE;

  FLASH_Unlock();
  /* Clear All pending flags */
  FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR); 
  sflag = len%2;
  if(sflag)
  {
    len --;
  }

  for(offset = 0; offset < len; offset += 2)
  {
    status = FLASH_ProgramHalfWord(programAddr + offset, ((u16)(pBuffer[offset + 1]) << 8) | (pBuffer[offset]));
    if(status != FLASH_COMPLETE)
    {
      printf("STM32_FlashWrite Err programAddr = %08x size = %d offset = %d status = %d\r\n",programAddr,size,offset,status);
      return FLH_WRITE_ERR;
    }
  }

 

  if(sflag && size>=1)
  {
    u16 val;

    val = pBuffer[size - 1]|0xFF00;
    status = FLASH_ProgramHalfWord(programAddr + offset, val);
    if(status != FLASH_COMPLETE)
    {
      printf("STM32_FlashWrite Err programAddr = %08x size = %d offset = %d status = %d\r\n",programAddr,size,offset,status);
      return FLH_WRITE_ERR;
    }        
  }

  FLASH_Lock();

  return FLH_SUCCESS;
}

/*——————————————————————————
* 函 数 名：STM32_FlashWriteZero  
* 输入参数：None
* 输出参数：None
* 返 回 值：见错误代码表
* 功能说明：对某一地址写０
*——————————————————————————*/
u8 STM32_FlashWriteZero(u32 programAddr, u16 size)
{
  u16 offset = 0;
  FLASH_Status status = FLASH_COMPLETE;

  FLASH_Unlock();
  /* Clear All pending flags */
  FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);

  if (size%2==1)
  {
    size +=1;
  }

  for(offset = 0; offset < size; offset += 2)
  {
    status = FLASH_ProgramHalfWord(programAddr + offset, 0);
    if(status != FLASH_COMPLETE)
    {
      //FLHDBG(printf("STM32FLASH: Write zero error."););
      return FLH_WRITE_ERR;
    }
  }

  FLASH_Lock();

  return FLH_SUCCESS;
}

/*****************************************************************************
 * Function      : read_unique_id
 * Description   : none
 * Input         : u8 * id  
 * Output        : None
 * Return        : 
 * Others        : 
 * Record
 * 1.Date        : 20170314
 *   Author      : barry
 *   Modification: Created function

*****************************************************************************/
bool read_unique_id(u8 * id)
{
  for (u8 i = 0; i < 12; i++)
  {
    id[i] = *((u8*)(FLASH_ID_IDDR + i));
  }

  for (u8 i = 0; i < 12; i++)
  {
    if (id[i] != 0xFF)
    {
        return TRUE;
    }
  }

  return FALSE;

}