stm32 nand flash 操作问题

2014-8-14 08:45

STM32 读取 NAND512W3A2CN6E 的ID为20 76 20 76.但是读取不到status。一直为0x00.应该为0xC0才对的。这是怎么回事呢？有遇到这个情况的吗？
NAND_FLASH_Time.FSMC_SetupTime = 1;    //建立时间
      NAND_FLASH_Time.FSMC_HoldSetupTime = 3; //保持时间
      NAND_FLASH_Time.FSMC_WaitSetupTime = 2; //等待时间
  NAND_FLASH_Time.FSMC_HiZSetupTime = 1;  //高阻建立时间

      NAND_FLASHStru.FSMC_Bank = FSMC_Bank2_NAND;                   //使用FSMC BANK2
      NAND_FLASHStru.FSMC_Waitfeature = FSMC_Waitfeature_Enable;    //使能FSMC的等待功能
      NAND_FLASHStru.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_8b; //NAND Flash 8bit
      NAND_FLASHStru.FSMC_ECC = FSMC_ECC_Enable;                   //使能ECC特性
      NAND_FLASHStru.FSMC_ECCPageSize = FSMC_ECCPageSize_512Bytes; //ECC页大小
      NAND_FLASHStru.FSMC_TCLRSetupTime = 0;
      NAND_FLASHStru.FSMC_TARSetupTime = 0;
      NAND_FLASHStru.FSMC_AttributeSpaceTimingStruct = &NAND_FLASH_Time;
      NAND_FLASHStru.FSMC_CommonSpaceTimingStruct = &NAND_FLASH_Time;

      FSMC_NANDInit(&NAND_FLASHStru);

      /*!使能FSMC BANK2 */
  FSMC_NANDCmd(FSMC_Bank2_NAND, ENABLE);

u32 FSMC_NAND_ReadStatus(void)
{
  u32 data = 0x00, status = NAND_BUSY;

  /* Read status operation ------------------------------------ */
  *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_STATUS;

  data = *(vu8 *)(Bank_NAND_ADDR);

  if((data & NAND_ERROR) == NAND_ERROR)//SR0
  {
status = NAND_ERROR;
  }
  else if((data & NAND_READY) == NAND_READY)//SR6
  {
status = NAND_READY;
  }
  else
  {
status = NAND_BUSY;
  }

  return (status);
}

/* NAND Area definition  Board RevD */
#define CMD_AREA                (u32)(1<<16)  /* A16 = CLE  high */
#define ADDR_AREA                (u32)(1<<17)  /* A17 = ALE high */
#define DATA_AREA                ((u32)0x00000000)
/* FSMC NAND memory command */

#define NAND_CMD_AREA_A          ((u8)0x00) //area_a(Bytes0~255)
#define NAND_CMD_AREA_B          ((u8)0x01) //area_b(Bytes256~511)
#define NAND_CMD_AREA_C          ((u8)0x50) //area_c(Bytes512~527)
#define NAND_CMD_AREA_TRUE1       ((u8)0x30)

#define NAND_CMD_WRITE0          ((u8)0x80)
#define NAND_CMD_WRITE_TRUE1    ((u8)0x10)

#define NAND_CMD_ERASE0          ((u8)0x60)
#define NAND_CMD_ERASE1          ((u8)0xD0)

#define NAND_CMD_READID          ((u8)0x90)
#define NAND_CMD_STATUS          ((u8)0x70)
#define NAND_CMD_LOCK_STATUS    ((u8)0x7A)
#define NAND_CMD_RESET          ((u8)0xFF)
//60h Block_address D0h 70h->SR0
//SR6
/* NAND memory status */
#define NAND_VALID_ADDRESS       ((u32)0x00000100)
#define NAND_INVALID_ADDRESS    ((u32)0x00000200)
#define NAND_TIMEOUT_ERROR       ((u32)0x00000400)
#define NAND_BUSY                ((u32)0x00000000)
#define NAND_ERROR                ((u32)0x00000001)
#define NAND_READY                ((u32)0x00000040)

void FSMC_NAND_ReadID(NAND_IDTypeDef* NAND_ID)
{
u32 data = 0;
/*!< Send Command to the command area */
  *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = 0x90;
      *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = 0x00;
/*!< Sequence to read ID from NAND flash */
data = *(vu32 *)(Bank_NAND_ADDR | DATA_AREA);
  NAND_ID->Maker_ID = ADDR_1st_CYCLE (data);//四个周期读取四个ID
      NAND_ID->Device_ID  = ADDR_2nd_CYCLE (data);
  NAND_ID->Third_ID = ADDR_3rd_CYCLE (data);
      NAND_ID->Fourth_ID  = ADDR_4th_CYCLE (data);
}

串口打印：SDRAM_16_write:eeff , SDRAM_16_read:eeff
NAND FLASH Status:0
Nand Flash ID = 20,76,20,76