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
- /*-- 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****/