stm32驱动NOR Flash 之MX25L51245G（64MB）

MX25L51245G 支持SPI的MODE0/MODE3，一般都选择mode3

#define FLASH_SECTOR_SIZE (4*1024)

#define FLASH_PAGE_SIZE 256

引脚定义

/*

* SPI1

* @SCK  : PA5

* @MISO : PA6

* @MOSI : PA7

*

* @CS   : PA0

*/

读写接口

static u8 SPI_Write(u8 byte)

{

u32 timeout = 0xFFFF;

while(!(SPI1->SR & SPI_I2S_FLAG_TXE))

{

if(--timeout == 0)

{

printf("TX timeout ! rn");

return 0;

}

}

SPI1->DR = byte;

timeout = 0xFFFF;

while(!(SPI1->SR & SPI_I2S_FLAG_RXNE))

if(--timeout == 0)

{

printf("RX timeout ! rn");

return 0;

}

return SPI1->DR;

}

static u8 SPI_Read(void)

{

    return (SPI_Write(DUMMY_BYTE));

}

初始化函数

void SPI1_Configuration(void)

{

SPI_InitTypeDef  SPI_InitStructure;

    GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    /* Configure SPI1 pins: NSS, SCK, MISO and MOSI */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure PA.0 as Output push-pull, used as Chip select */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Deselect the FLASH: Chip Select high */

    SPI_CS_Low();

    /* SPI1 configuration */ 

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;          /* mode 3 */

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI1, &SPI_InitStructure);

    /* Enable SPI1 NSS output for master mode */

    //SPI_SSOutputCmd(SPI1, DISABLE);    

    /* Enable SPI1  */

    SPI_Cmd(SPI1, ENABLE); 

SPI_Write(0xFF); //start transport

}

等待忙

/*

* @return : none-zero idle, else busy

*/

static u8 SPI_WaitBusy(void)

{

u32 timeout = 0xFFFF;

while( SET==SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY)) /* SPI_SR */

{

if(--timeout == 0)

return 1;

}

return 0;

}

Flash 等待WIP信号

#define    FLASH_WIP_MASK         (1 << 0)

/*

* @return : none-zero timeout

*/

static u8 FlashWait_Busy(void)

{

    u8 FLASH_Status;

    u32 retry=0;

    FLASH_CS_Low();

/*

* bit 0: WIP (=1 busy, else free)

* bit 1: WEL (=1 write enable)

*/

    SPI_Write(RDSD_CMD);          /* read status register */

    do{

        FLASH_Status=SPI_Read();

        if(retry++ > FLASH_BUSY_TIMEOUT)

            return FLASH_Status;

    }while((FLASH_Status & FLASH_WIP_MASK) == FLASH_WIP_MASK);    /* fix : not bit 7 !!! */

    //printf("status register : 0x%x rn", FLASH_Status);

    SPI_CS_High();

return 0;

}

获取flash信息

static void FlashGet_Info(flashInfoTypedef * pFlashInfo)

{

//     FlashWait_Busy();

    FLASH_CS_Low();

    SPI_Write(RDID_CMD);

    pFlashInfo->ManufacturerID=SPI_Read();

    pFlashInfo->DeviceID[0]=SPI_Read();

    pFlashInfo->DeviceID[1]=SPI_Read();

    SPI_CS_High();    

}

static void FlashGet_ElectronicInfo(flashInfoTypedef * pFlashInfo)

{

    FLASH_CS_Low();

    SPI_Write(REMS_CMD);

    SPI_Write(DUMMY_BYTE);

    SPI_Write(DUMMY_BYTE);

    SPI_Write(0x00);             //manufacturer's ID first

    pFlashInfo->ManufacturerID=SPI_Read();

    pFlashInfo->DeviceID[0]=SPI_Read();   

    SPI_CS_High();    

}

写使能

static void FlashWriteEnable(void)

{

    FLASH_CS_Low();

    SPI_Write(WREN_CMD);   

    SPI_CS_High();    

}

spi flash初始化

void SpiFlash_Init(void)

{

flashInfoTypedef flashInfo;

//SPI1_Configuration();

#if 1

FlashGet_ElectronicInfo(&flashInfo);

if((flashInfo.ManufacturerID==0xc2)&&(flashInfo.DeviceID[0]==0x20))

    {

        printf("Flash Info: MXIC(Macronix International Co.,Ltdrn");

    }

#endif

    FlashGet_Info(&flashInfo);

    printf("ManufacturerID = 0x%02X     rn",flashInfo.ManufacturerID);

    printf("DeviceID       = 0x%02X%02X rn",flashInfo.DeviceID[0],flashInfo.DeviceID[1]);

}

获取ID的接口

static void Flash_ReadID(void)

{

flashInfoTypedef flashInfo;

FlashGet_ElectronicInfo(&flashInfo);

if((flashInfo.ManufacturerID==0xc2)&&(flashInfo.DeviceID[0]==0x20))

    {

        printf("Flash Info: MXIC(Macronix International Co.,Ltdrn");

    }

    FlashGet_Info(&flashInfo);

    printf("ManufacturerID = 0x%02X     rn",flashInfo.ManufacturerID);

    printf("DeviceID       = 0x%02X%02X rn",flashInfo.DeviceID[0],flashInfo.DeviceID[1]);

}