NAND FLASH 用FSMC操作怎么设置 芯片是K9F2G08U0A

DQ7077

#define FSMC_Bank_NAND     FSMC_Bank2_NAND
#define Bank_NAND_ADDR     Bank2_NAND_ADDR
#define Bank2_NAND_ADDR    ((uint32_t)0x70000000)  


#define ADDR_1st_CYCLE(ADDR)       (uint8_t)((ADDR)& 0xFF)               /* 1st addressing cycle */
#define ADDR_2nd_CYCLE(ADDR)       (uint8_t)(((ADDR)& 0xFF00) >> 8)      /* 2nd addressing cycle */
#define ADDR_3rd_CYCLE(ADDR)       (uint8_t)(((ADDR)& 0xFF0000) >> 16)   /* 3rd addressing cycle */
#define ADDR_4th_CYCLE(ADDR)       (uint8_t)(((ADDR)& 0xFF000000) >> 24) /* 4th addressing cycle */  

#define CMD_AREA                   (uint32_t)(1<<16)  /* A16 = CLE  high */
#define ADDR_AREA                  (uint32_t)(1<<17)  /* A17 = ALE high */

typedef struct
{
  uint8_t Maker_ID;
  uint8_t Device_ID;
  uint8_t Third_ID;
  uint8_t Fourth_ID;
}NAND_IDTypeDef;

     void NAND_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  FSMC_NANDInitTypeDef FSMC_NANDInitStructure;
  FSMC_NAND_PCCARDTimingInitTypeDef  p;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE |
                         RCC_APB2Periph_GPIOF | RCC_APB2Periph_GPIOG, ENABLE);
  
/*-- GPIO Configuration ------------------------------------------------------*/
/*!< CLE, ALE, D0->D3, NOE, NWE and NCE2  NAND pin configuration  */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_14 | GPIO_Pin_15 |  
                                 GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5 |
                                 GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
/*!< D4->D7 NAND pin configuration  */  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

/*!< NWAIT NAND pin configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

  GPIO_Init(GPIOD, &GPIO_InitStructure);
/*!< INT2 NAND pin configuration */  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_Init(GPIOG, &GPIO_InitStructure);
  /*-- FSMC Configuration ------------------------------------------------------*/
  p.FSMC_SetupTime = 0x0;
  p.FSMC_WaitSetupTime = 0x2;
  p.FSMC_HoldSetupTime = 0x1;
  p.FSMC_HiZSetupTime = 0x0;
  FSMC_NANDInitStructure.FSMC_Bank = FSMC_Bank2_NAND;
  FSMC_NANDInitStructure.FSMC_Waitfeature = FSMC_Waitfeature_Enable;
  FSMC_NANDInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_8b;
  FSMC_NANDInitStructure.FSMC_ECC = FSMC_ECC_Enable;
  FSMC_NANDInitStructure.FSMC_ECCPageSize = FSMC_ECCPageSize_1024Bytes;
  FSMC_NANDInitStructure.FSMC_TCLRSetupTime = 0x00;
  FSMC_NANDInitStructure.FSMC_TARSetupTime = 0x00;
  FSMC_NANDInitStructure.FSMC_CommonSpaceTimingStruct = &p;
  FSMC_NANDInitStructure.FSMC_AttributeSpaceTimingStruct = &p;
  FSMC_NANDInit(&FSMC_NANDInitStructure);
  /*!< FSMC NAND Bank Cmd Test */
  FSMC_NANDCmd(FSMC_Bank2_NAND, ENABLE);
}


void NAND_ReadID(NAND_IDTypeDef* NAND_ID)
{
  uint32_t data = 0;
  /*!< Send Command to the command area */
  *(__IO uint8_t *)(Bank_NAND_ADDR | CMD_AREA) = 0x90;
  *(__IO uint8_t *)(Bank_NAND_ADDR | ADDR_AREA) = 0x00;
   /*!< Sequence to read ID from NAND flash */
   data = *(__IO uint32_t *)(Bank_NAND_ADDR | DATA_AREA);
   NAND_ID->Maker_ID   = ADDR_1st_CYCLE (data);
   NAND_ID->Device_ID  = ADDR_2nd_CYCLE (data);
   NAND_ID->Third_ID   = ADDR_3rd_CYCLE (data);
   NAND_ID->Fourth_ID  = ADDR_4th_CYCLE (data);
}

我在官网上下的例程 好多地方不理解 求帮助

   data = *(__IO uint32_t *)(Bank_NAND_ADDR | DATA_AREA);这个语句我不是太理解  硬件与STM32连接是8根线  我是这么想的 需要读四次才能组成32位的数据 为什么这边一条语句就能读出32位  另外一个问题就是 NAND FLASH把数据送到FSMC里面 读数据为什么都读0x70000000地址里面的数据？

zuozhongkai

1、STM32会自动的去读4字节的数据，虽然你的只是8位。
2、NAND FLASH在读数据的时候会发送要读的地址的，所以并不是从0X70000000这里读的