stm32 FSMC-外扩SRAM IS62WV51216

最新推荐文章于 2025-07-01 15:10:07 发布

转载最新推荐文章于 2025-07-01 15:10:07 发布 · 1w 阅读

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#stm32 #外扩SRAM

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本文介绍了使用STM32的灵活静态内存控制器(FSMC)配置外部SRAM的过程。包括使能GPIO时钟、配置GPIO引脚模式、使能FSMC时钟、FSMC初始化及存储器块使能等步骤，并提供了具体的代码示例。

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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];
    }
}