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标题: STM32-移植FATFS的NANDFLASH驱动（5） [打印本页]

作者: yuyang911220 时间: 2015-4-28 21:12 标题: STM32-移植FATFS的NANDFLASH驱动（5）

/**
* @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);
}

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