STM32-移植FATFS的NANDFLASH驱动（5）

yuyang911220

• /**
•    * @brief  This routine erase complete block from NAND FLASH
•    * @param  PageAddress: Any address into block to be erased
•    * @retval :New status of the NAND operation. This parameter can be:
•    *              - NAND_TIMEOUT_ERROR: when the previous operation generate
•    *                a Timeout error
•    *              - NAND_READY: when memory is ready for the next operation
•    */
  
• 
  
• uint32_t FSMC_NAND_EraseBlock(uint32_t PageAddress)  
• {  
•   uint32_t data = 0xff, status = NAND_ERROR;  
• 
  
•    *(__IO uint8_t *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_ERASE0;  
• 
  
•    *(__IO uint8_t *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_3rd_CYCLE(PageAddress);  
•    *(__IO uint8_t *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_4th_CYCLE(PageAddress);  
• 
  
•    *(__IO uint8_t *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_ERASE1;  
• 
  
•    while( GPIO_ReadInputDataBit(GPIOG, GPIO_Pin_6) == 0 );  
• 
  
•    /* Read status operation ------------------------------------ */
  
•    FSMC_NAND_GetStatus();  
• 
  
•    data = *(__IO uint8_t *)(Bank_NAND_ADDR | DATA_AREA);  
• 
  
•    if(!(data&0x1)) status = NAND_READY;  
• 
  
•    return (status);  
• }  
• 
  
• /**
•    * @brief  This routine reset the NAND FLASH
•    * @param  None
•    * @retval :NAND_READY
•    */
  
• 
  
• uint32_t FSMC_NAND_Reset(void)  
• {  
•    *(__IO uint8_t *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_RESET;  
• 
  
•    return (NAND_READY);  
• }  
• 
  
• /**
•    * @brief  Get the NAND operation status
•    * @param  None
•    * @retval :New status of the NAND operation. This parameter can be:
•    *              - NAND_TIMEOUT_ERROR: when the previous operation generate
•    *                a Timeout error
•    *              - NAND_READY: when memory is ready for the next operation   
•    */
  
• 
  
• 
  
• uint32_t FSMC_NAND_GetStatus(void)  
• {  
•    uint32_t timeout = 0x1000000, status = NAND_READY;  
• 
  
•    status = FSMC_NAND_ReadStatus();  
• 
  
•    /* Wait for a NAND operation to complete or a TIMEOUT to occur */
  
•    while ((status != NAND_READY) &&( timeout != 0x00))  
•    {  
•       status = FSMC_NAND_ReadStatus();  
•       timeout --;      
•    }  
• 
  
•    if(timeout == 0x00)  
•    {           
•      status =  NAND_TIMEOUT_ERROR;      
•    }  
• 
  
•    /* Return the operation status */
  
•    return (status);      
• }  
• 
  
• /**
•    * @brief  Reads the NAND memory status using the Read status command
•    * @param  None
•    * @retval :The status of the NAND memory. This parameter can be:
•    *              - NAND_BUSY: when memory is busy
•    *              - NAND_READY: when memory is ready for the next operation   
•    *              - NAND_ERROR: when the previous operation gererates error     
•    */
  
• 
  
• uint32_t FSMC_NAND_ReadStatus(void)  
• {  
•    uint32_t data = 0x00, status = NAND_BUSY;  
• 
  
•    /* Read status operation ------------------------------------ */
  
•    *(__IO uint8_t *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_STATUS;  
•    data = *(__IO uint8_t *)(Bank_NAND_ADDR);  
• 
  
•    if((data & NAND_ERROR) == NAND_ERROR)  
•    {  
•      status = NAND_ERROR;  
•    }  
•    else
  if((data & NAND_READY) == NAND_READY)  
•    {  
•      status = NAND_READY;  
•    }  
•    else
  
•    {  
•      status = NAND_BUSY;  
•    }  
• 
  
•    return (status);  
• }