STM32访问外部存储器-NOR-Flash

发布时间：2020-12-15 18:00:23 所属栏目：百科来源：网络整理

导读：作者： emouse 转自：http://www.voidcn.com/article/p-patqdlkh-qm.html 基本说明 STM32访问外部存储器是需要配置FSMC的相关函数，在STM32固件库函数说明的中文翻译版中并没有这部分的说明，因此需要参考库函数的相关说明和库中自带的例程。以下内容来自AN

作者：emouse

转自：http://www.voidcn.com/article/p-patqdlkh-qm.html

基本说明

STM32访问外部存储器是需要配置FSMC的相关函数，在STM32固件库函数说明的中文翻译版中并没有这部分的说明，因此需要参考库函数的相关说明和库中自带的例程。

以下内容来自AN2784应用笔记：

2 与非总线复用模式的异步16位NOR闪存接口

2.1

FSMC配置

控制一个NOR闪存存储器，需要FSMC提供下述功能：

●

选择合适的存储块映射NOR闪存存储器：共有4个独立的存储块可以用于与NOR闪存、SRAM和PSRAM存储器接口，每个存储块都有一个专用的片选管脚。

●

使用或禁止地址/数据总线的复用功能。

●

选择所用的存储器类型：NOR闪存、SRAM或PSRAM。

●

定义外部存储器的数据总线宽度：8或16位。

●

使用或关闭同步NOR闪存存储器的突发访问模式。

●

配置等待信号的使用：开启或关闭，极性设置，时序配置。

●

使用或关闭扩展模式：扩展模式用于访问那些具有不同读写操作时序的存储器。

因为NOR闪存/SRAM控制器可以支持异步和同步存储器，用户只须根据存储器的参数配置使用到的参数。

FSMC提供了一些可编程的参数，可以正确地与外部存储器接口。依存储器类型的不同，有些参数是不需要的。

当使用一个外部异步存储器时，用户必须按照存储器的数据手册给出的时序数据，计算和设置下列参数：

●

ADDSET：地址建立时间

●

ADDHOLD：地址保持时间

●

DATAST：数据建立时间

●

ACCMOD：访问模式这个参数允许 FSMC可以灵活地访问多种异步的静态存储器。共有4种扩展模式允许以不同的时序分别读写存储器。在扩展模式下，FSMC_BTR用于配置读操作，FSMC_BWR用于配置写操作。(译注：如果读时序与写时序相同，只须使用FSMC_BTR即可。)

如果使用了同步的存储器，用户必须计算和设置下述参数：

●

CLKDIV：时钟分频系数

●

DATLAT：数据延时

如果存储器支持的话，NOR闪存的读操作可以是同步的，而写操作仍然是异步的。

当对一个同步的NOR闪存编程时，存储器会自动地在同步与异步之间切换；因此，必须正确地设置所有的参数

程序分析

[cpp] view plain copy print ?

?/*--?FSMC?Configuration?----------------------------------------------------*/??
??p.FSMC_AddressSetupTime?=?0x05;?????/*ADDSET??地址建立时间*/??
??p.FSMC_AddressHoldTime?=?0x00;????/*ADDHOLD?地址保持时间*/??
??p.FSMC_DataSetupTime?=?0x07;?????/*DATAST?数据建立时间*/??
??p.FSMC_BusTurnAroundDuration?=?0x00;???/*BUSTURN?总线返转时间*/??
??p.FSMC_CLKDivision?=?0x00;??????/*CLKDIV?时钟分频*/??
??p.FSMC_DataLatency?=?0x00;?????/*DATLAT?数据保持时间*/??
??p.FSMC_AccessMode?=?FSMC_AccessMode_B;???/*访问模式*/??
/*NOR/SRAM的存储块，共4个选项*/??
??FSMC_NORSRAMInitStructure.FSMC_Bank?=?FSMC_Bank1_NORSRAM2;??????
/*是否选择地址和数据复用数据线*/??
??FSMC_NORSRAMInitStructure.FSMC_DataAddressMux?=?FSMC_DataAddressMux_Disable;????
/*连接到相应存储块的外部存储器类型*/??
??FSMC_NORSRAMInitStructure.FSMC_MemoryType?=?FSMC_MemoryType_NOR;?????
/*存储器数据总线宽度*/??
??FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth?=?FSMC_MemoryDataWidth_16b;????
/*使能或关闭同步NOR闪存存储器的突发访问模式设置是否使用迸发访问模式(应该就是连续读写模式吧)*/??
??FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode?=?FSMC_BurstAccessMode_Disable;?????
/*设置WAIT信号的有效电平*/??
??FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity?=?FSMC_WaitSignalPolarity_Low;?????
?/*设置是否使用环回模式*/??
??FSMC_NORSRAMInitStructure.FSMC_WrapMode?=?FSMC_WrapMode_Disable;??????
/*设置WAIT信号有效时机*/??
??FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive?=?FSMC_WaitSignalActive_BeforeWaitState;???
/*设定是否使能写操作*/??
??FSMC_NORSRAMInitStructure.FSMC_WriteOperation?=?FSMC_WriteOperation_Enable;????
/*设定是否使用WAIT信号*/??
??FSMC_NORSRAMInitStructure.FSMC_WaitSignal?=?FSMC_WaitSignal_Disable;?????
/*使能或关闭扩展模式，扩展模式用于访问具有不同读写操作时序的存储器，设定是否使用单独的写时序*/???????
??FSMC_NORSRAMInitStructure.FSMC_ExtendedMode?=?FSMC_ExtendedMode_Disable;????
/*设定是否使用异步等待信号*/??
??FSMC_NORSRAMInitStructure.FSMC_AsyncWait?=?FSMC_AsyncWait_Disable;????
/*设定是否使用迸发写模式*/????
??FSMC_NORSRAMInitStructure.FSMC_WriteBurst?=?FSMC_WriteBurst_Disable;????
?/*设定读写时序*/??
??FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct?=?&p;????//???????
??FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct?=?&p;????//??
???????????????????
??FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);????????//??
??/*?Enable?FSMC?Bank1_NOR?Bank?*/??
??FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM2,?ENABLE);????????//??
}??

实际例程

以下例程来自??stm3210e_eval_fsmc_nor.c具体信息参加固件库中源文件。

[c-sharp] view plaincopyprint?

/**?
??******************************************************************************?
??*?@file????stm3210e_eval_fsmc_nor.c?
??*?@author??MCD?Application?Team?
??*?@version?V4.3.0?
??*?@date????10/15/2010?
??*?@brief???This?file?provides?a?set?of?functions?needed?to?drive?the?M29W128FL,??
??*??????????M29W128GL?and?S29GL128P?NOR?memories?mounted?on?STM3210E-EVAL?board.?
??******************************************************************************?
??*?@copy?
??*?
??*?THE?PRESENT?FIRMWARE?WHICH?IS?FOR?GUIDANCE?ONLY?AIMS?AT?PROVIDING?CUSTOMERS?
??*?WITH?CODING?INFORMATION?REGARDING?THEIR?PRODUCTS?IN?ORDER?FOR?THEM?TO?SAVE?
??*?TIME.?AS?A?RESULT,?STMICROELECTRONICS?SHALL?NOT?BE?HELD?LIABLE?FOR?ANY?
??*?DIRECT,?INDIRECT?OR?CONSEQUENTIAL?DAMAGES?WITH?RESPECT?TO?ANY?CLAIMS?ARISING?
??*?FROM?THE?CONTENT?OF?SUCH?FIRMWARE?AND/OR?THE?USE?MADE?BY?CUSTOMERS?OF?THE?
??*?CODING?INFORMATION?CONTAINED?HEREIN?IN?CONNECTION?WITH?THEIR?PRODUCTS.?
??*?
??*/???
/*?Includes?------------------------------------------------------------------*/??
#include?"stm3210e_eval_fsmc_nor.h"??
/**?@addtogroup?Utilities?
??*?@{?
??*/??
????
/**?@addtogroup?STM32_EVAL?
??*?@{?
??*/???
/**?@addtogroup?STM3210E_EVAL?
??*?@{?
??*/??
????
/**?@addtogroup?STM3210E_EVAL_FSMC_NOR?
??*?@brief??????This?file?provides?a?set?of?functions?needed?to?drive?the?M29W128FL,??
??*?????????????M29W128GL?and?S29GL128P?NOR?memories?mounted?on?STM3210E-EVAL?board.?
??*?@{?
??*/???
/**?@defgroup?STM3210E_EVAL_FSMC_NOR_Private_Types?
??*?@{?
??*/???
/**?
??*?@}?
??*/???
/**?@defgroup?STM3210E_EVAL_FSMC_NOR_Private_Defines?
??*?@{?
??*/???
/**??
??*?@brief??FSMC?Bank?1?NOR/SRAM2???
??*/??
#define?Bank1_NOR2_ADDR???????((uint32_t)0x64000000)??
/*?Delay?definition?*/?????
#define?BlockErase_Timeout????((uint32_t)0x00A00000)??
#define?ChipErase_Timeout?????((uint32_t)0x30000000)???
#define?Program_Timeout???????((uint32_t)0x00001400)???????
/**?
??*?@}?
??*/???
??
/**?@defgroup?STM3210E_EVAL_FSMC_NOR_Private_Macros?
??*?@{?
??*/??
#define?ADDR_SHIFT(A)?(Bank1_NOR2_ADDR?+?(2?*?(A)))??
#define?NOR_WRITE(Address,?Data)??(*(__IO?uint16_t?*)(Address)?=?(Data))????
/**?
??*?@}?
??*/???
????
/**?@defgroup?STM3210E_EVAL_FSMC_NOR_Private_Variables?
??*?@{?
??*/???
/**?
??*?@}?
??*/???
??
/**?@defgroupSTM3210E_EVAL_FSMC_NOR_Private_Function_Prototypes?
??*?@{?
??*/???
/**?
??*?@}?
??*/???
??
/**?@defgroup?STM3210E_EVAL_FSMC_NOR_Private_Functions?
??*?@{?
??*/??
/**?
??*?@brief??Configures?the?FSMC?and?GPIOs?to?interface?with?the?NOR?memory.?
??*?????????This?function?must?be?called?before?any?write/read?operation?
??*?????????on?the?NOR.?
??*?@param??None?
??*?@retval?None?
??*/??
void?NOR_Init(void)??
{??
??FSMC_NORSRAMInitTypeDef??FSMC_NORSRAMInitStructure;??
??FSMC_NORSRAMTimingInitTypeDef??p;??
??GPIO_InitTypeDef?GPIO_InitStructure;??
??RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD?|?RCC_APB2Periph_GPIOE?|???
?????????????????????????RCC_APB2Periph_GPIOF?|?RCC_APB2Periph_GPIOG,?ENABLE);??
??/*--?GPIO?Configuration?------------------------------------------------------*/??
??/*!<?NOR?Data?lines?configuration?*/??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_0?|?GPIO_Pin_1?|?GPIO_Pin_8?|?GPIO_Pin_9?|??
????????????????????????????????GPIO_Pin_10?|?GPIO_Pin_14?|?GPIO_Pin_15;??
??GPIO_InitStructure.GPIO_Mode?=?GPIO_Mode_AF_PP;??
??GPIO_InitStructure.GPIO_Speed?=?GPIO_Speed_50MHz;??
??GPIO_Init(GPIOD,?&GPIO_InitStructure);??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_7?|?GPIO_Pin_8?|?GPIO_Pin_9?|?GPIO_Pin_10?|??
????????????????????????????????GPIO_Pin_11?|?GPIO_Pin_12?|?GPIO_Pin_13?|??
????????????????????????????????GPIO_Pin_14?|?GPIO_Pin_15;??
??GPIO_Init(GPIOE,?&GPIO_InitStructure);??
??/*!<?NOR?Address?lines?configuration?*/??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_0?|?GPIO_Pin_1?|?GPIO_Pin_2?|?GPIO_Pin_3?|??
????????????????????????????????GPIO_Pin_4?|?GPIO_Pin_5?|?GPIO_Pin_12?|?GPIO_Pin_13?|??
????????????????????????????????GPIO_Pin_14?|?GPIO_Pin_15;??
??GPIO_Init(GPIOF,?&GPIO_InitStructure);??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_0?|?GPIO_Pin_1?|?GPIO_Pin_2?|??
????????????????????????????????GPIO_Pin_3?|?GPIO_Pin_4?|?GPIO_Pin_5;??
??GPIO_Init(GPIOG,?&GPIO_InitStructure);??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_11?|?GPIO_Pin_12?|?GPIO_Pin_13;??
??GPIO_Init(GPIOD,?&GPIO_InitStructure);??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_3?|?GPIO_Pin_4?|?GPIO_Pin_5?|?GPIO_Pin_6;??
??GPIO_Init(GPIOE,?&GPIO_InitStructure);??
??/*!<?NOE?and?NWE?configuration?*/??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_4?|?GPIO_Pin_5;??
??GPIO_Init(GPIOD,?&GPIO_InitStructure);??
??/*!<?NE2?configuration?*/??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_9;??
??GPIO_Init(GPIOG,?&GPIO_InitStructure);??
??/*!<?Configure?PD6?for?NOR?memory?Ready/Busy?signal?*/??
??GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_6;??
??GPIO_InitStructure.GPIO_Mode?=?GPIO_Mode_IN_FLOATING;??
??GPIO_Init(GPIOD,?&GPIO_InitStructure);??
????
??/*--?FSMC?Configuration?----------------------------------------------------*/??
??p.FSMC_AddressSetupTime?=?0x02;??
??p.FSMC_AddressHoldTime?=?0x00;??
??p.FSMC_DataSetupTime?=?0x05;??
??p.FSMC_BusTurnAroundDuration?=?0x00;??
??p.FSMC_CLKDivision?=?0x00;??
??p.FSMC_DataLatency?=?0x00;??
??p.FSMC_AccessMode?=?FSMC_AccessMode_B;??
??FSMC_NORSRAMInitStructure.FSMC_Bank?=?FSMC_Bank1_NORSRAM2;??
??FSMC_NORSRAMInitStructure.FSMC_DataAddressMux?=?FSMC_DataAddressMux_Disable;??
??FSMC_NORSRAMInitStructure.FSMC_MemoryType?=?FSMC_MemoryType_NOR;??
??FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth?=?FSMC_MemoryDataWidth_16b;??
??FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode?=?FSMC_BurstAccessMode_Disable;??
??FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait?=?FSMC_AsynchronousWait_Disable;????
??FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity?=?FSMC_WaitSignalPolarity_Low;??
??FSMC_NORSRAMInitStructure.FSMC_WrapMode?=?FSMC_WrapMode_Disable;??
??FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive?=?FSMC_WaitSignalActive_BeforeWaitState;??
??FSMC_NORSRAMInitStructure.FSMC_WriteOperation?=?FSMC_WriteOperation_Enable;??
??FSMC_NORSRAMInitStructure.FSMC_WaitSignal?=?FSMC_WaitSignal_Disable;??
??FSMC_NORSRAMInitStructure.FSMC_ExtendedMode?=?FSMC_ExtendedMode_Disable;??
??FSMC_NORSRAMInitStructure.FSMC_WriteBurst?=?FSMC_WriteBurst_Disable;??
??FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct?=?&p;??
??FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct?=?&p;??
??FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);??
??/*!<?Enable?FSMC?Bank1_NOR?Bank?*/??
??FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM2,?ENABLE);??
}??
/**?
??*?@brief??Reads?NOR?memory's?Manufacturer?and?Device?Code.?
??*?@param??NOR_ID:?pointer?to?a?NOR_IDTypeDef?structure?which?will?hold?the??
??*?????????Manufacturer?and?Device?Code.???
??*?@retval?None?
??*/??
void?NOR_ReadID(NOR_IDTypeDef*?NOR_ID)??
{??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x00AA);??
??NOR_WRITE(ADDR_SHIFT(0x02AA),?0x0055);??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x0090);??
??NOR_ID->Manufacturer_Code?=?*(__IO?uint16_t?*)?ADDR_SHIFT(0x0000);??
??NOR_ID->Device_Code1?=?*(__IO?uint16_t?*)?ADDR_SHIFT(0x0001);??
??NOR_ID->Device_Code2?=?*(__IO?uint16_t?*)?ADDR_SHIFT(0x000E);??
??NOR_ID->Device_Code3?=?*(__IO?uint16_t?*)?ADDR_SHIFT(0x000F);??
}??
/**?
??*?@brief??Erases?the?specified?Nor?memory?block.?
??*?@param??BlockAddr:?address?of?the?block?to?erase.?
??*?@retval?NOR_Status:?The?returned?value?can?be:?NOR_SUCCESS,?NOR_ERROR?
??*?????????or?NOR_TIMEOUT?
??*/??
NOR_Status?NOR_EraseBlock(uint32_t?BlockAddr)??
{??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x0080);??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x00AA);??
??NOR_WRITE(ADDR_SHIFT(0x02AA),?0x0055);??
??NOR_WRITE((Bank1_NOR2_ADDR?+?BlockAddr),?0x30);??
??return?(NOR_GetStatus(BlockErase_Timeout));??
}??
/**?
??*?@brief??Erases?the?entire?chip.?
??*?@param??None???????????????????????
??*?@retval?NOR_Status:?The?returned?value?can?be:?NOR_SUCCESS,?NOR_ERROR?
??*?????????or?NOR_TIMEOUT?
??*/??
NOR_Status?NOR_EraseChip(void)??
{??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x0055);??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x0010);??
??return?(NOR_GetStatus(ChipErase_Timeout));??
}??
/**?
??*?@brief??Writes?a?half-word?to?the?NOR?memory.?
??*?@param??WriteAddr:?NOR?memory?internal?address?to?write?to.?
??*?@param??Data:?Data?to?write.??
??*?@retval?NOR_Status:?The?returned?value?can?be:?NOR_SUCCESS,?NOR_ERROR?
??*?????????or?NOR_TIMEOUT?
??*/??
NOR_Status?NOR_WriteHalfWord(uint32_t?WriteAddr,?uint16_t?Data)??
{??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x00A0);??
??NOR_WRITE((Bank1_NOR2_ADDR?+?WriteAddr),?Data);??
??return?(NOR_GetStatus(Program_Timeout));??
}??
/**?
??*?@brief??Writes?a?half-word?buffer?to?the?FSMC?NOR?memory.??
??*?@param??pBuffer:?pointer?to?buffer.??
??*?@param??WriteAddr:?NOR?memory?internal?address?from?which?the?data?will?be??
??*?????????written.?
??*?@param??NumHalfwordToWrite:?number?of?Half?words?to?write.??
??*?@retval?NOR_Status:?The?returned?value?can?be:?NOR_SUCCESS,?NOR_ERROR?
??*?????????or?NOR_TIMEOUT?
??*/??
NOR_Status?NOR_WriteBuffer(uint16_t*?pBuffer,?uint32_t?WriteAddr,?uint32_t?NumHalfwordToWrite)??
{??
??NOR_Status?status?=?NOR_ONGOING;???
??do??
??{??
????/*!<?Transfer?data?to?the?memory?*/??
????status?=?NOR_WriteHalfWord(WriteAddr,?*pBuffer++);??
????WriteAddr?=?WriteAddr?+?2;??
????NumHalfwordToWrite--;??
??}??
??while((status?==?NOR_SUCCESS)?&&?(NumHalfwordToWrite?!=?0));??
????
??return?(status);???
}??
/**?
??*?@brief??Writes?a?half-word?buffer?to?the?FSMC?NOR?memory.?This?function??
??*?????????must?be?used?only?with?S29GL128P?NOR?memory.?
??*?@param??pBuffer:?pointer?to?buffer.??
??*?@param??WriteAddr:?NOR?memory?internal?address?from?which?the?data?will?be??
??*?????????written.?
??*?@param??NumHalfwordToWrite:?number?of?Half?words?to?write.?
??*?????????The?maximum?allowed?value?is?32?Half?words?(64?bytes).?
??*?@retval?NOR_Status:?The?returned?value?can?be:?NOR_SUCCESS,?NOR_ERROR?
??*?????????or?NOR_TIMEOUT?
??*/??
NOR_Status?NOR_ProgramBuffer(uint16_t*?pBuffer,?uint32_t?NumHalfwordToWrite)??
{??
??uint32_t?lastloadedaddress?=?0x00;??
??uint32_t?currentaddress?=?0x00;??
??uint32_t?endaddress?=?0x00;??
??/*!<?Initialize?variables?*/??
??currentaddress?=?WriteAddr;??
??endaddress?=?WriteAddr?+?NumHalfwordToWrite?-?1;??
??lastloadedaddress?=?WriteAddr;??
??/*!<?Issue?unlock?command?sequence?*/??
??NOR_WRITE(ADDR_SHIFT(0x00555),?0x0055);????
??/*!<?Write?Write?Buffer?Load?Command?*/??
??NOR_WRITE(ADDR_SHIFT(WriteAddr),?0x0025);??
??NOR_WRITE(ADDR_SHIFT(WriteAddr),?(NumHalfwordToWrite?-?1));??
??/*!<?Load?Data?into?NOR?Buffer?*/??
??while(currentaddress?<=?endaddress)??
??{??
????/*!<?Store?last?loaded?address?&?data?value?(for?polling)?*/??
????lastloadedaddress?=?currentaddress;??
???
????NOR_WRITE(ADDR_SHIFT(currentaddress),?*pBuffer++);??
????currentaddress?+=?1;???
??}??
??NOR_WRITE(ADDR_SHIFT(lastloadedaddress),?0x29);??
????
??return(NOR_GetStatus(Program_Timeout));??
}??
/**?
??*?@brief??Reads?a?half-word?from?the?NOR?memory.??
??*?@param??ReadAddr:?NOR?memory?internal?address?to?read?from.?
??*?@retval?Half-word?read?from?the?NOR?memory?
??*/??
uint16_t?NOR_ReadHalfWord(uint32_t?ReadAddr)??
{??
??NOR_WRITE(ADDR_SHIFT(0x00555),?0x00AA);???
??NOR_WRITE(ADDR_SHIFT(0x002AA),?0x0055);????
??NOR_WRITE((Bank1_NOR2_ADDR?+?ReadAddr),?0x00F0?);??
??return?(*(__IO?uint16_t?*)((Bank1_NOR2_ADDR?+?ReadAddr)));??
}??
/**?
??*?@brief??Reads?a?block?of?data?from?the?FSMC?NOR?memory.?
??*?@param??pBuffer:?pointer?to?the?buffer?that?receives?the?data?read?from?the??
??*?????????NOR?memory.?
??*?@param??ReadAddr:?NOR?memory?internal?address?to?read?from.?
??*?@param??NumHalfwordToRead?:?number?of?Half?word?to?read.?
??*?@retval?None?
??*/??
void?NOR_ReadBuffer(uint16_t*?pBuffer,?uint32_t?ReadAddr,?uint32_t?NumHalfwordToRead)??
{??
??NOR_WRITE(ADDR_SHIFT(0x0555),?0x0055);??
??NOR_WRITE((Bank1_NOR2_ADDR?+?ReadAddr),?0x00F0);??
??for(;?NumHalfwordToRead?!=?0x00;?NumHalfwordToRead--)?/*!<?while?there?is?data?to?read?*/??
??{??
????/*!<?Read?a?Halfword?from?the?NOR?*/??
????*pBuffer++?=?*(__IO?uint16_t?*)((Bank1_NOR2_ADDR?+?ReadAddr));??
????ReadAddr?=?ReadAddr?+?2;???
??}????
}??
/**?
??*?@brief??Returns?the?NOR?memory?to?Read?mode.?
??*?@param??None?
??*?@retval?NOR_SUCCESS?
??*/??
NOR_Status?NOR_ReturnToReadMode(void)??
{??
??NOR_WRITE(Bank1_NOR2_ADDR,?0x00F0);??
??return?(NOR_SUCCESS);??
}??
/**?
??*?@brief??Returns?the?NOR?memory?to?Read?mode?and?resets?the?errors?in?the?NOR??
??*?????????memory?Status?Register.???
??*?@param??None?
??*?@retval?NOR_SUCCESS?
??*/??
NOR_Status?NOR_Reset(void)??
{??
??NOR_WRITE(ADDR_SHIFT(0x00555),?0x00AA);???
??NOR_WRITE(ADDR_SHIFT(0x002AA),?0x0055);???
??NOR_WRITE(Bank1_NOR2_ADDR,?0x00F0);???
??return?(NOR_SUCCESS);??
}??
/**?
??*?@brief??Returns?the?NOR?operation?status.?
??*?@param??Timeout:?NOR?progamming?Timeout?
??*?@retval?NOR_Status:?The?returned?value?can?be:?NOR_SUCCESS,?NOR_ERROR?
??*?????????or?NOR_TIMEOUT?
??*/??
NOR_Status?NOR_GetStatus(uint32_t?Timeout)??
{???
??uint16_t?val1?=?0x00,?val2?=?0x00;??
??NOR_Status?status?=?NOR_ONGOING;???
??uint32_t?timeout?=?Timeout;??
??/*!<?Poll?on?NOR?memory?Ready/Busy?signal?----------------------------------*/??
??while((GPIO_ReadInputDataBit(GPIOD,?GPIO_Pin_6)?!=?RESET)?&&?(timeout?>?0))???
??{??
????timeout--;??
??}??
??timeout?=?Timeout;??
????
??while((GPIO_ReadInputDataBit(GPIOD,?GPIO_Pin_6)?==?RESET)?&&?(timeout?>?0))?????
??{??
????timeout--;??
??}??
????
??/*!<?Get?the?NOR?memory?operation?status?-----------------------------------*/??
??while((Timeout?!=?0x00)?&&?(status?!=?NOR_SUCCESS))??
??{??
????Timeout--;??
????/*!<?Read?DQ6?and?DQ5?*/??
????val1?=?*(__IO?uint16_t?*)(Bank1_NOR2_ADDR);??
????val2?=?*(__IO?uint16_t?*)(Bank1_NOR2_ADDR);??
????/*!<?If?DQ6?did?not?toggle?between?the?two?reads?then?return?NOR_Success?*/??
????if((val1?&?0x0040)?==?(val2?&?0x0040))???
????{??
??????return?NOR_SUCCESS;??
????}??
????if((val1?&?0x0020)?!=?0x0020)??
????{??
??????status?=?NOR_ONGOING;??
????}??
????val1?=?*(__IO?uint16_t?*)(Bank1_NOR2_ADDR);??
????val2?=?*(__IO?uint16_t?*)(Bank1_NOR2_ADDR);??
??????
????if((val1?&?0x0040)?==?(val2?&?0x0040))???
????{??
??????return?NOR_SUCCESS;??
????}??
????else?if((val1?&?0x0020)?==?0x0020)??
????{??
??????return?NOR_ERROR;??
????}??
??}??
??if(Timeout?==?0x00)??
??{??
????status?=?NOR_TIMEOUT;??
??}???
??/*!<?Return?the?operation?status?*/??
??return?(status);??
}??
/**?
??*?@}?
??*/??
/**?
??*?@}?
??*/??
/**?
??*?@}?
??*/??
/**?
??*?@}?
??*/??
/**?
??*?@}?
??*/????
/*******************?(C)?COPYRIGHT?2010?STMicroelectronics?*****END?OF?FILE****/

（编辑：李大同）

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