[参考译文] CCS/RM57L843：NOR 闪存读取和写入

您好、Zain、

很抱歉耽误你的回答。 我找到了 NOR 闪存的测试用例。 以下是 NOR 闪存擦除/读取/写入和初始化函数：

/*
* NOR 闪存代码
*由 QJ Wang 提供
* 2012年3月19日
*

#include "EMIF_norFlash.h"
#include "hL_sys_common.h"
#include "HL_EMIF.h"

uint32_t timeout = 0x00100000；


/*---------------------------------------------- *
* *
* flash_init() *
* *
* 设置闪存 *
* *
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uint16_t flash_init()
｛
/*----------------- *
* *
* NOR 闪存(插座) *
* S29Gl512N 设置- 110ns - 64MB *
* *
＊＊＊＊＊＊－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－ *

EMIF_ASYNC3Init()；
FLASH_BASE_PTR8 = FLASH_RESET；
返回0；
｝

/*---------------------------------------------- *
* *
* flash_waitWhileErasing() *
* *
* 擦除时等待(Spansion Flash) *
* *
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uint16_t _flash_waitWhileErasing( uint32_t addr、uint32_t timeout )
｛
uint8_t* pdata =(uint8_t*) addr；

while (--timeout >0)
如果(*pdata ==0xFF)
返回0；/*正常、擦除完成*/

/*发生超时*/
FLASH_BASE_PTR8 = FLASH_RESET；
返回1；
｝

/*---------------------------------------------- *
* *
* flash_waitWhileProgramming() *
* *
* 编程时等待(Spansion Flash) *
* *
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uint16_t _flash_waitWhileProgramming( uint32_t addr、uint16_t data、uint32_t timeout )
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uint16_t* pdata =( uint16_t*) addr；

while (--timeout >0)
if (*pdata == data)(如果(*pdata ==数据)
返回0；/*正常，编程完成*/

/*发生超时*/
FLASH_BASE_PTR8 = FLASH_RESET；

返回1；
｝


/*---------------------------------------------- *
* *
* flash_erase (start、length) *
* 擦除包含地址(开始)到(开始+长度)的闪存。 *
* 闪存只能擦除包含此范围的整个块。 *
* *
* START <-起始地址 *
* length <-以字节为单位的长度 *
* *
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uint16_t flash_erase (uint32_t start、uint32_t length)
｛
uint32_t addr；
uint32_t end；
volatile uint16_t* addr16；

结束=开始+长度- 1； //计算范围的末尾
START &= 0xFFFFFFFE； //与16位字对齐

/*
*擦除范围内的每个闪存块
*
对于(addr = start；addr <= end；addr += flash_pagesize)
｛
addr16=( volatile uint16_t*) addr;
* addr16 = flash_reset； //重置闪存
FLASH_CTL555 = FLASH_CMD_AA；
FLASH_CTL2AA = FLASH_CMD_55；
FLASH_CTL555 = FLASH_ERASE； //擦除扇区命令
FLASH_CTL555 = FLASH_CMD_AA；
FLASH_CTL2AA = FLASH_CMD_55；
* addr16 = flash_erase_sector；//擦除扇区确认

#ifdef EMIF_USE_REORDER 修复
EMIF_REVID = 0；
#endif

if (_flash_waitWhileErasing( addr，timeout))
｛
* addr16 = flash_reset；
返回-1；
｝
｝

返回0；
｝
/*---------------------------------------------- *
* *
* flash_write( src、dst、length ) *
* 写入闪存地址[dst]非闪存地址[src]*上的数据
* 对于[length]#bytes。 *
* *
* 源 源地址 *
* 目的<-目的地址 *
* length <-以字节为单位的长度 *
* *
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uint16_t flash_write (uint32_t src、uint32_t dst、uint32_t length)
｛
uint32_t i；
uint8_t* psrc8；
uint16_t* pdst16；

uint8_t extra 字节到写入；
uint16_t full_word_to write = 0；
uint8_t* lower byte_to write =(uint8_t*)(&full_word_to write)；
uint8_t* UPPER 字节至写入=(uint8_t*)(&full_word_to 写入+ 1)；

/*与16位闪存对齐*/
if ((dst & 1)==1)
｛
*LOW_BYTE_TO_WRITE =*(uint8_t*)(dst-1)；
*UPLOAD_BYTE_TO_WRITE =*(uint8_t*)(src)；
flash_write((( uint32_t )&full_word_to write，dst-1，2 )；
dst=dst+1；
src = src + 1；
length = length - 1；
｝

/*
*对齐到8或16位
*
extra byte_TO_WRITE =长度和1；

psrc8 =(uint8_t*) src；
pdst16 =( uint16_t*) dst;
长度&= 0xFFFFFFFE；
对于(i = 0；i < length；i += 2)
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/*
*将16位源数据读取为2 x 8位字节。
*这看起来相当奇怪，但可以避免出现任何寻呼问题
*数据跨越多个高速缓存页，MMU 处于活动状态。
*
full_word_to _write =*psrc8 |(*(uint8_t*)(psrc8 + 1)<< 8)；
psrc8 += 2；

/*编程一个16位字*/
FLASH_CTL555 = FLASH_CMD_AA；
FLASH_CTL2AA = FLASH_CMD_55；
FLASH_CTL555 = FLASH_PROGRAM；
*pdst16 = full_word_to write；

/*等待编程完成*/
if (_flash_waitWhileProgramming ((uint32_t) pdst16、full_word_to write、timeout))
返回-1；

pdst16++；
｝

/*对齐16位 SRC 最后*/
if (extra byte_TO_WRITE = 1)
｛
*LOW_BYTE_TO_WRITE =*psrc8；
*UPLOAD_BYTE_TO_WRITE =(*pdst16 )>>8;
flash_write((( uint32_t )&full_word_to write ( uint32_t )pdst16、2 )；
｝

/*
*设置为读取模式
*
FLASH_BASE_PTR8 = FLASH_RESET；

返回0；
｝

/*---------------------------------------------- *
* *
* flash_read (src、dst、length) *
* 从闪存地址( src )读取到非闪存地址*上的数据
* ( dst )表示( length )字节。 *
* *
* 源 源地址 *
* 目的<-目的地址 *
* length <-以字节为单位的长度 *
* *
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uint16_t flash_read (uint32_t src、uint32_t dst、uint32_t length)
｛
uint32_t i；
uint16_t* psrc16 =( uint16_t*) src；
uint16_t* pdst16 =(uint16_t*) dst;

/*
*设置为读取模式
*
FLASH_BASE_PTR8 = FLASH_RESET；

/*
*将数据读取到缓冲区
*
对于(i = 0；i < length；i += 2)
*pdst16++=*psrc16++；

返回0；
｝