/*==============================================================================**   FILENAME: FLASHMEM.C**   DESCRIPTION: Source Code of Am29LV64xD Flash Memory Device Driver**   CURRENT VERSION: 1.0**   HISTORY:**   Date           CR No      Person        Description*   ----------  ------------  ------       -------------*   2004-07-22                Li Lan       Initial version.*==============================================================================*//*==============================================================================	Includes and Variable Definitions==============================================================================*//* 包含變量定義文件 */#include "drv/mem/FlashMem.h"/*==============================================================================	Include Files==============================================================================*//* 要包含的其他文件 *//*==============================================================================	Constant / Defines==============================================================================*//* 常量定義，并對常量定義進行簡要說明 *//*==============================================================================	Type Declarations==============================================================================*//* 類型定義，struct、enum等，對每種類型定義作簡要說明，如果是重要數(shù)據(jù)結(jié)構(gòu)，要詳細   說明 *//*==============================================================================	Global Constant Definitions==============================================================================*//* 全局常量定義，并對其進行簡要說明 */#ifdef FLASH_SIZE_WRITEABLE	#define FLASH_MEM_SIZE      FLASH_SIZE_WRITEABLE#else	#define FLASH_MEM_SIZE      FLASH_SIZE#endif  /* FLASH_SIZE_WRITEABLE *//*==============================================================================	Global Variable Definitions==============================================================================*//* 全局變量定義，并對其進行簡要說明 */char gFlashType[16];/*==============================================================================	Local Object Definitions==============================================================================*//* 局部對象定義，并對其進行簡要說明 *//*==============================================================================	Static Variable Definitions==============================================================================*//* 靜態(tài)變量定義，并對其進行簡要說明 */LOCAL flash_t sysFlash = {0};/*==============================================================================	Forward Declarations==============================================================================*//* 前置聲明 */#ifdef  __STDC__LOCAL INT32 sysGetFlashStatus(UINT16* addr_ptr);LOCAL STATUS sysFlashTypeGet(void *flash_addr);#else   /* __STDC__ */LOCAL INT32 sysGetFlashStatus();LOCAL STATUS sysFlashTypeGet();#endif  /* __STDC__ *//*==============================================================================	Function Definitions==============================================================================*//*------------------------------------------------------------------------------**   Function Name: sysFlashGet**   Input(s):*       UINT8* str_ptr: where to copy flash memory*       UINT32 strLen: maximum number of bytes to copy*       UINT32 offset: byte offset into flash memory**   Output(s):*       <none>**   Returns:*       OK, or ERROR if access is outside the flash memory range.**   Description:*       This routine copies the contents of flash memory into a specified*       string.*       If multiple tasks are calling sysFlashSet() and sysFlashGet(),*       they should use a semaphore to ensure mutually exclusive access.*------------------------------------------------------------------------------*/STATUS sysFlashGet(UINT8* str_ptr, UINT32 str_len, UINT32 offset){	if (((offset + str_len) > FLASH_MEM_SIZE) || (NULL == str_ptr))	{		return(ERROR);	}	bcopyBytes((char *)(FLASH_ADRS + offset), (char *)str_ptr, str_len);	return(OK);}/*------------------------------------------------------------------------------**   Function Name: sysGetFlashStatus**   Input(s):*       UINT8* addr_ptr: flash address(not offset)**   Output(s):*       <none>**   Returns:*       AMD_STATUS_READY;*       AMD_STATUS_BUSY;*       AMD_STATUS_ERSUSP;*       AMD_STATUS_TIMEOUT;*       AMD_STATUS_ERROR**   Description:*       This routine utilizes the DQ6, DQ5, and DQ2 polling algorithms.*------------------------------------------------------------------------------*/LOCAL INT32 sysGetFlashStatus(UINT16* addr_ptr){	UINT8 data, result;	if(NULL == addr_ptr)	{		return AMD_STATUS_ERROR;	}	data = *addr_ptr;               /* read data first time */	result = data ^ (*addr_ptr);    /* see what toggled */	if (0 == result)	{		return AMD_STATUS_READY;    /* no toggles, nothing's happening */	}	if (result & AMD_DQ6)           /* DQ6 */	{		if (data & AMD_DQ5)         /* DQ5 */		{			/* return AMD_STATUS_TIMEOUT */;		}		else		{			return AMD_STATUS_BUSY;		}	}	/* The second opteration */	data = *addr_ptr;               /* read data again */	result = data ^ (*addr_ptr);    /* see what toggled */	if (0 == result)	{		return AMD_STATUS_READY;    /* no toggles, nothing's happening */	}	if (AMD_DQ2 == result)          /* DQ2 */	{		return AMD_STATUS_ERSUSP;	}	if (result & AMD_DQ6)           /* DQ6 */	{		if (data & AMD_DQ5)         /* DQ5 */		{			return AMD_STATUS_TIMEOUT;		}		else		{			return AMD_STATUS_BUSY;		}	}	return AMD_STATUS_ERROR;}/*------------------------------------------------------------------------------**   Function Name: sysFlashErase**   Input(s):*       UINT32 flash_offset: flash offset address**   Output(s):*       <none>**   Returns:*       OK, or ERROR if access is outside the flash memory range.**   Description:*       This routine clears the contents of a sector of flash memory.*------------------------------------------------------------------------------*/STATUS sysFlashErase(UINT32 flash_offset){	UINT16* flash_ptr;	int ps;	if (flash_offset >= FLASH_MEM_SIZE)	{		printf("param: flashOffset error!\n");		return(ERROR);	}	flash_ptr = (UINT16 *)(FLASH_ADRS + (flash_offset / AMD_FLASH_SECTOR_SIZE) * \				AMD_FLASH_SECTOR_SIZE);	ps = intLock();	if (flash_offset < 0x1000000 / 2)	{		*AMD_REG(0) = AMD_CMD_RESET;            /* assume reset device to read mode */			*AMD_REG(0x555) = AMD_UNLOCK_CIRCLE_1;  /* unlock 1 */		*AMD_REG(0x2AA) = AMD_UNLOCK_CIRCLE_2;  /* unlock 2 */		*AMD_REG(0x555) = AMD_CMD_ERASE;		*AMD_REG(0x555) = AMD_UNLOCK_CIRCLE_1;		*AMD_REG(0x2AA) = AMD_UNLOCK_CIRCLE_2;	}	else	{		*AMD_REG_2(0) = AMD_CMD_RESET;            /* assume reset device to read mode */			*AMD_REG_2(0x555) = AMD_UNLOCK_CIRCLE_1;  /* unlock 1 */		*AMD_REG_2(0x2AA) = AMD_UNLOCK_CIRCLE_2;  /* unlock 2 */		*AMD_REG_2(0x555) = AMD_CMD_ERASE;		*AMD_REG_2(0x555) = AMD_UNLOCK_CIRCLE_1;		*AMD_REG_2(0x2AA) = AMD_UNLOCK_CIRCLE_2;	}	*AMD_REG((flash_offset / AMD_FLASH_SECTOR_SIZE) * AMD_FLASH_SECTOR_SIZE / 2) = AMD_CMD_SECTOR_ERASE;	intUnlock(ps);	while (sysGetFlashStatus(flash_ptr) == AMD_STATUS_BUSY)	{		;	}	if (flash_offset < 0x1000000 / 2)	{		*AMD_REG(0) = AMD_CMD_RESET;            /* assume reset device to read mode */	}	else	{		*AMD_REG_2(0) = AMD_CMD_RESET;            /* assume reset device to read mode */	}	CACHE_PIPE_FLUSH();	return(OK);}/*------------------------------------------------------------------------------**   Function Name: sysFlashAllErase**   Input(s):*       <none>**   Output(s):*       <none>**   Returns:*       OK.**   Description:*       This routine clears the contents of all sectors of flash memory.*------------------------------------------------------------------------------*/STATUS sysFlashAllErase(void){	UINT16* flash_ptr;	int ps;	flash_ptr = (UINT16 *)(FLASH_ADRS);	ps = intLock();	*AMD_REG(0) = AMD_CMD_RESET;                /* assume reset device to read mode */	*AMD_REG(0x555) = AMD_UNLOCK_CIRCLE_1;      /* unlock 1 */	*AMD_REG(0x2AA) = AMD_UNLOCK_CIRCLE_2;      /* unlock 2 */	*AMD_REG(0x555) = AMD_CMD_ERASE;	*AMD_REG(0x555) = AMD_UNLOCK_CIRCLE_1;	*AMD_REG(0x2AA) = AMD_UNLOCK_CIRCLE_2;	*AMD_REG(0x555) = AMD_CMD_CHIP_ERASE;	intUnlock(ps);	while (sysGetFlashStatus(flash_ptr) == AMD_STATUS_BUSY)	{		;	}	*AMD_REG(0) = AMD_CMD_RESET;                /* assume reset device to read mode */#ifdef MCB_FLASH_16M	flash_ptr = (UINT16 *)(FLASH_ADRS + AMD_FLASH_SECTOR_SIZE * AMD_FLASH_MAX_SECTOR);	ps = intLock();	*AMD_REG_2(0) = AMD_CMD_RESET;                /* assume reset device to read mode */	*AMD_REG_2(0x555) = AMD_UNLOCK_CIRCLE_1;      /* unlock 1 */	*AMD_REG_2(0x2AA) = AMD_UNLOCK_CIRCLE_2;      /* unlock 2 */	*AMD_REG_2(0x555) = AMD_CMD_ERASE;	*AMD_REG_2(0x555) = AMD_UNLOCK_CIRCLE_1;	*AMD_REG_2(0x2AA) = AMD_UNLOCK_CIRCLE_2;	*AMD_REG_2(0x555) = AMD_CMD_CHIP_ERASE;	intUnlock(ps);	while (sysGetFlashStatus(flash_ptr) == AMD_STATUS_BUSY)	{		;