[MM32软件] FSMC非复用方式控制NOR Flash的程序设计

void FSMC_NOR_Init(void)

{

    FSMC_InitTypeDef  FSMC_InitStructure;

    FSMC_NORSRAM_Bank_InitTypeDef  FSMC_BankInitStructure;



    FSMC_NORSRAM_BankStructInit(&FSMC_BankInitStructure);

    FSMC_NORSRAMStructInit(&FSMC_InitStructure);

    RCC_AHB3PeriphClockCmd(RCC_AHB3ENR_FSMC, ENABLE);



    FSMC_BankInitStructure.FSMC_SMReadPipe    = 0;

    FSMC_BankInitStructure.FSMC_ReadyMode     = 0;

    FSMC_BankInitStructure.FSMC_WritePeriod   = 15;

    FSMC_BankInitStructure.FSMC_WriteHoldTime = 3;

    FSMC_BankInitStructure.FSMC_AddrSetTime   = 3;

    FSMC_BankInitStructure.FSMC_ReadPeriod    = 15;

    FSMC_BankInitStructure.FSMC_DataWidth     = FSMC_DataWidth_16bits;

    FSMC_NORSRAM_Bank_Init(&FSMC_BankInitStructure, \

    FSMC_NORSRAM_BANK1);



    FSMC_InitStructure.FSMC_Mode = FSMC_Mode_NorFlash;

    FSMC_InitStructure.FSMC_TimingRegSelect = FSMC_TimingRegSelect_0;

    FSMC_InitStructure.FSMC_MemSize = FSMC_MemSize_64MB;

    FSMC_InitStructure.FSMC_MemType = FSMC_MemType_FLASH;

    FSMC_InitStructure.FSMC_AddrDataMode = FSMC_AddrDataDeMUX;

    FSMC_NORSRAMInit(&FSMC_InitStructure);

}

void FSMC_GPIO_Init(void)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_StructInit(&GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

    RCC_AHBPeriphClockCmd(RCC_AHBENR_GPIOB | RCC_AHBENR_GPIOC | \

    RCC_AHBENR_GPIOA | RCC_AHBENR_GPIOD | RCC_AHBENR_GPIOE | \

    RCC_AHBENR_GPIOF | RCC_AHBENR_GPIOG, ENABLE);



    GPIO_PinAFConfig(GPIOD, GPIO_PinSource4, GPIO_AF_12);  //NOE

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_12);  //NWE

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_12);  //NWAIT

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource11, GPIO_AF_12); //A16

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_12); //A17

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_12); //A18

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_12); //D0

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_12); //D1

    //省略部分代码

    GPIO_PinAFConfig(GPIOF, GPIO_PinSource0, GPIO_AF_12);  //A0

    GPIO_PinAFConfig(GPIOF, GPIO_PinSource1, GPIO_AF_12);  //A1

    GPIO_PinAFConfig(GPIOF, GPIO_PinSource2, GPIO_AF_12);  //A2

    GPIO_PinAFConfig(GPIOF, GPIO_PinSource3, GPIO_AF_12);  //A3

    //省略部分代码

    GPIO_InitStructure.GPIO_Pin  =  GPIO_Pin_All;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init(GPIOD, &GPIO_InitStructure);



    GPIO_InitStructure.GPIO_Pin  =  GPIO_Pin_6;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_FLOATING;

    GPIO_Init(GPIOD, &GPIO_InitStructure);



    //省略部分代码



}

#define NOR_FLASH_START_ADDR       ((u32)0x64000000)

#define NOR_FLASH_END_ADDR         ((u32)0x67FFFFFF)

//读一个半字

u16 FSMC_NOR_ReadHalfWord(u32 ReadAddr)

{

    NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA);

    NOR_WRITE(ADDR_SHIFT(0x002AA), 0x0055);

    NOR_WRITE((NOR_FLASH_START_ADDR + ReadAddr), 0x00F0 );

/* exit autoselect (write reset command) */

    return (*(vu16*)((NOR_FLASH_START_ADDR + ReadAddr)));

}

//连续读一块半字数据

void FSMC_NOR_ReadBuffer(u16* pBuffer, u32 ReadAddr, u32 NumHalfwordToRead)

{

    NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);

    NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);

    NOR_WRITE((NOR_FLASH_START_ADDR + ReadAddr), 0x00F0);

/* exit autoselect (write reset command) */

    for(; NumHalfwordToRead != 0x00; NumHalfwordToRead--) {

        // Read a Halfword from the NOR

        *pBuffer++ = *(vu16*)((NOR_FLASH_START_ADDR + ReadAddr));

        ReadAddr = ReadAddr + 2;

    }

}

NOR_Status FSMC_NOR_WriteHalfWord(u32 WriteAddr, u16 Data)

{

    NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);

    NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);

    NOR_WRITE(ADDR_SHIFT(0x0555), 0x00A0);

    NOR_WRITE((NOR_FLASH_START_ADDR + WriteAddr), Data);



    return (FSMC_NOR_GetStatus(Program_Timeout));

}