STM32访问外部存储器-NOR-Flash

 

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：

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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。

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使用或禁止地址/数据总线的复用功能。

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选择所用的存储器类型：NOR闪存、SRAM或PSRAM。

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定义外部存储器的数据总线宽度：8或16位。

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使用或关闭同步NOR闪存存储器的突发访问模式。

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配置等待信号的使用：开启或关闭，极性设置，时序配置。

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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：

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ADDSET：地址建立时间

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ADDHOLD：地址保持时间

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DATAST：数据建立时间

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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：

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CLKDIV：时钟分频系数

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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

/*-- 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。

/** ****************************************************************************** * @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. * * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2> */ /* 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), 0x00AA); NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055); 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), 0x00AA); NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055); NOR_WRITE(ADDR_SHIFT(0x0555), 0x0080); NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA); NOR_WRITE(ADDR_SHIFT(0x02AA), 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), 0x00AA); NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055); 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 WriteAddr, 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), 0x00AA); NOR_WRITE(ADDR_SHIFT(0x02AA), 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), 0x00AA); NOR_WRITE(ADDR_SHIFT(0x02AA), 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****/