stm32 FSMC-外扩SRAM IS62WV51216

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引脚定义

FSMC配置步骤

1.使能对应引脚GPIO时钟

2.配置GPIO引脚模式

3.使能FSMC时钟

4.FSMC初始化

5.存储器块使能

举例

#define Bank1_SRAM3_ADDR    ((u32)(0x68000000))  //首地址0x60000000，每块0x40000000

void SRAM_gpio_init()

{

    GPIO_InitTypeDef gpiof =

    {

        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, //FSMC_A0 - FSMC_A9

        GPIO_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    GPIO_InitTypeDef gpiog0_5 =

    {

        GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5, //FSMC_A10 - FSMC_A15

        GPIO_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    GPIO_InitTypeDef gpiod =

    {

        GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | //FSMC_A15 - FSMC_A18

        GPIO_Pin_14 | GPIO_Pin_15 | GPIO_Pin_0 | GPIO_Pin_1 | //FSMC_D0 - FSMC_D3

            GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10, //FSMC_D13 - FSMC_D15

        GPIO_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    GPIO_InitTypeDef gpioe =

    {

        //FSMC_D4 - FSMC_D12

        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_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    GPIO_InitTypeDef gpioe0_1 =

    {

        GPIO_Pin_0 | GPIO_Pin_1, //FSMC_NBL0-FSMC_NBL1

        GPIO_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    GPIO_InitTypeDef gpiod4_5 =

    {

        GPIO_Pin_4 | GPIO_Pin_5, //FSMC_NOE - FSMC_NWE

        GPIO_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    GPIO_InitTypeDef gpiog10 =

    {

        GPIO_Pin_10, //片选

        GPIO_Speed_50MHz,

        GPIO_Mode_AF_PP

    };

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF | RCC_APB2Periph_GPIOG | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE, ENABLE);

    GPIO_Init(GPIOF, &gpiof);

    GPIO_Init(GPIOG, &gpiog0_5);

    GPIO_Init(GPIOD, &gpiod);

    GPIO_Init(GPIOE, &gpioe);

    GPIO_Init(GPIOE, &gpioe0_1);

    GPIO_Init(GPIOD, &gpiod4_5);

    GPIO_Init(GPIOG, &gpiog10);

}

void FSMC_sram_init()

{

    FSMC_NORSRAMInitTypeDef fsmc = {0};

    FSMC_NORSRAMTimingInitTypeDef FSMC_ReadWriteTimingStruct = {0};

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

    FSMC_ReadWriteTimingStruct.FSMC_AddressSetupTime = 0x00;

    FSMC_ReadWriteTimingStruct.FSMC_AddressHoldTime = 0x00;

    FSMC_ReadWriteTimingStruct.FSMC_DataSetupTime = 0x08;

    FSMC_ReadWriteTimingStruct.FSMC_BusTurnAroundDuration = 0x00;

    FSMC_ReadWriteTimingStruct.FSMC_CLKDivision = 0x00;

    FSMC_ReadWriteTimingStruct.FSMC_DataLatency = 0x00;

    FSMC_ReadWriteTimingStruct.FSMC_AccessMode = FSMC_AccessMode_A;

    fsmc.FSMC_Bank = FSMC_Bank1_NORSRAM3;

    fsmc.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;

    fsmc.FSMC_MemoryType = FSMC_MemoryType_SRAM;

    fsmc.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;

    fsmc.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;

    fsmc.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable;

    fsmc.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;

    fsmc.FSMC_WrapMode = FSMC_WrapMode_Disable;

    fsmc.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;

    fsmc.FSMC_WriteOperation = FSMC_WriteOperation_Enable;

    fsmc.FSMC_WaitSignal = FSMC_WaitSignal_Disable;

    fsmc.FSMC_ExtendedMode = FSMC_ExtendedMode_Enable; //扩展模式使能

    fsmc.FSMC_WriteBurst = FSMC_WriteBurst_Disable;

    fsmc.FSMC_ReadWriteTimingStruct = &FSMC_ReadWriteTimingStruct;

    fsmc.FSMC_WriteTimingStruct = &FSMC_ReadWriteTimingStruct;

    FSMC_NORSRAMInit(&fsmc);

    FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM3, ENABLE);

}

void SRAM_read(u8 *buf, u32 addr, u32 num)

{

    u32 i = 0;

    for(i = 0; i < num; i++)

    {

        buf[i] = *(u8*)(Bank1_SRAM3_ADDR + addr + i);

    }

}

void SRAM_write(u8 *buf, u32 addr, u32 num)

{

    u32 i = 0;

    u8 *p = (u8*)(Bank1_SRAM3_ADDR + addr);

    for(i = 0; i < num; i++)

    {

        *(p + i) = buf[i];

    }

}