【国民技术车规MCU N32A455开发板】04、通过SPI FLASH熟悉SPI通讯（SPI1 & SPI2)

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【国民技术车规MCU N32A455开发板】04、通过SPI FLASH熟悉SPI通讯（SPI1 & SPI2) [复制链接]

本帖最后由 xld0932 于 2024-3-14 15:26 编辑

1.概述

国民技术N32A455系列MCU搭载了3路SPI接口，同时还具备I2S功能；SPI允许芯片与外部设备以半/全双工、同步、串行方式通信。此接口可以被配置成主模式，并为外部从设备提供通信时钟(SCK)。接口还能以多主配置方式工作。它可用于多种用途，包括使用一条双向数据线的双线单工同步传输，还可使用CRC校验的可靠通信。

2.N32A455开发板SPI FLASH原理图

开发板板载一路SPI FLASH（W25Q128JVSIQTR），占用了SPI1外设资源，通过设置跳线J29、 J30、 J31、 J32与MCU的PA4、PA5、PA6、PA7相连接，所以在做SPI FLASH实验时，需要注意跳线的连接状态

3.SPI示例程序

我们参考官方的SPI FLASH示例工程，通过SPI1接口对SPI FLASH进行读、写、擦除等操作，通过修改代码将每个过程的数据打印出来，更加的直观：

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int main(void)
{
    /*!< At this stage the microcontroller clock setting is already configured,
         this is done through SystemInit() function which is called from startup
         file (startup_n32a455.s) before to branch to application main.
         To reconfigure the default setting of SystemInit() function, refer to
         system_n32a455.c file
       */
    log_init();
    LedInit(GPIOE, LED1 | LED2);
    LedOff(GPIOE, LED1 | LED2);

    /* Initialize the SPI FLASH driver */
    sFLASH_Init();

    /* Get SPI Flash ID */
    FlashID = sFLASH_ReadID();
    printf("\r\nRead ID=0x%06x",FlashID);
    /* Check the SPI Flash ID */
    if ((FlashID == sFLASH_ID)||(FlashID == sFLASH_W25Q128_ID_DTR))
    {
        /* OK: Turn on LED1 */
        LedOn(GPIOE, LED1);
        /* Perform a write in the Flash followed by a read of the written data */
        /* Erase SPI FLASH Sector to write on */
        sFLASH_EraseSector(FLASH_SectorToErase);

        /* Read data from SPI FLASH memory */
        sFLASH_ReadBuffer(Rx_Buffer, FLASH_ReadAddress, BufferSize);

        printf("\r\nRead after Erase...");

        for (uint32_t i = 0; i < BufferSize; i++)
        {
            if ((i % 16) == 0)
            {
                printf("\r\n");
            }

            printf("0x%02X ", Rx_Buffer[i]);
        }

        printf("\r\n");

        /* Write Tx_Buffer data to SPI FLASH memory */
        sFLASH_WriteBuffer(Tx_Buffer, FLASH_WriteAddress, BufferSize);

        /* Read data from SPI FLASH memory */
        sFLASH_ReadBuffer(Rx_Buffer, FLASH_ReadAddress, BufferSize);

        printf("\r\nRead after Write...");

        for (uint32_t i = 0; i < BufferSize; i++)
        {
            if ((i % 16) == 0)
            {
                printf("\r\n");
            }

            printf("0x%02X ", Rx_Buffer[i]);
        }

        printf("\r\n");

        printf("\r\n%s", Rx_Buffer);

        printf("\r\n");

        /* Check the correctness of written dada */
        TransferStatus1 = Buffercmp(Tx_Buffer, Rx_Buffer, BufferSize);
        if(PASSED == TransferStatus1)
            printf("\r\nFlash write OK.");
        else
            printf("\r\nFlash write fail.");
        /* TransferStatus1 = PASSED, if the transmitted and received data by SPI1
           are the same */
        /* TransferStatus1 = FAILED, if the transmitted and received data by SPI1
           are different */

        /* Perform an erase in the Flash followed by a read of the written data */
        /* Erase SPI FLASH Sector to write on */
        sFLASH_EraseSector(FLASH_SectorToErase);

        /* Read data from SPI FLASH memory */
        sFLASH_ReadBuffer(Rx_Buffer, FLASH_ReadAddress, BufferSize);

        printf("\r\nRead after Erase...");

        for (uint32_t i = 0; i < BufferSize; i++)
        {
            if ((i % 16) == 0)
            {
                printf("\r\n");
            }

            printf("0x%02X ", Rx_Buffer[i]);
        }

        printf("\r\n");

        /* Check the correctness of erasing operation dada */
        for (Index = 0; Index < BufferSize; Index++)
        {
            if (Rx_Buffer[Index] != 0xFF)
            {
                TransferStatus2 = FAILED;
                break;
            }
        }
        
        if(PASSED == TransferStatus2)
            printf("\r\nSector erase OK.");
        else
            printf("\r\nSector erase fail.");
        /* TransferStatus2 = PASSED, if the specified sector part is erased */
        /* TransferStatus2 = FAILED, if the specified sector part is not well erased */
    }
    else
    {
        /* Error: Turn on LED2 */
        LedOn(GPIOE, LED2);
        printf("\r\nRead ID fail.");
    }

    while (1)
    {
    }
}

4.运行结果

4.1.硬件环境

4.2.运行结果

5.使用SPI2操作SPI FLASH的注意事项

N32A455开发板上的PE10\PE11\PE12\PE13这几个接口作为SPI2通讯接口，正好也没有被其它板载资源所占用，所以就使用这4个引脚来验证一下SPI2操作SPI FLASH的功能，首先需要对程序进行配置

5.1.在spi_flash.h文件中对操作SPI FLASH的接口和外设进行定义：

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#if 0
#define sFLASH_SPI                SPI1
#define sFLASH_SPI_CLK            RCC_APB2_PERIPH_SPI1
#define sFLASH_SPI_SCK_PIN        GPIO_PIN_5 /* PA.05 */
#define sFLASH_SPI_SCK_GPIO_PORT  GPIOA      /* GPIOA */
#define sFLASH_SPI_SCK_GPIO_CLK   RCC_APB2_PERIPH_GPIOA
#define sFLASH_SPI_MISO_PIN       GPIO_PIN_6 /* PA.06 */
#define sFLASH_SPI_MISO_GPIO_PORT GPIOA      /* GPIOA */
#define sFLASH_SPI_MISO_GPIO_CLK  RCC_APB2_PERIPH_GPIOA
#define sFLASH_SPI_MOSI_PIN       GPIO_PIN_7 /* PA.07 */
#define sFLASH_SPI_MOSI_GPIO_PORT GPIOA      /* GPIOA */
#define sFLASH_SPI_MOSI_GPIO_CLK  RCC_APB2_PERIPH_GPIOA
#define sFLASH_CS_PIN             GPIO_PIN_4 /* PA.04 */
#define sFLASH_CS_GPIO_PORT       GPIOA      /* GPIOA */
#define sFLASH_CS_GPIO_CLK        RCC_APB2_PERIPH_GPIOA
#else
#define sFLASH_SPI                SPI2
#define sFLASH_SPI_CLK            RCC_APB1_PERIPH_SPI2
#define sFLASH_SPI_SCK_PIN        GPIO_PIN_11/* PE.11 */
#define sFLASH_SPI_SCK_GPIO_PORT  GPIOE      /* GPIOE */
#define sFLASH_SPI_SCK_GPIO_CLK   RCC_APB2_PERIPH_GPIOE
#define sFLASH_SPI_MISO_PIN       GPIO_PIN_12/* PA.12 */
#define sFLASH_SPI_MISO_GPIO_PORT GPIOE      /* GPIOE */
#define sFLASH_SPI_MISO_GPIO_CLK  RCC_APB2_PERIPH_GPIOE
#define sFLASH_SPI_MOSI_PIN       GPIO_PIN_13/* PA.13 */
#define sFLASH_SPI_MOSI_GPIO_PORT GPIOE      /* GPIOE */
#define sFLASH_SPI_MOSI_GPIO_CLK  RCC_APB2_PERIPH_GPIOE
#define sFLASH_CS_PIN             GPIO_PIN_10/* PE.10 */
#define sFLASH_CS_GPIO_PORT       GPIOE      /* GPIOE */
#define sFLASH_CS_GPIO_CLK        RCC_APB2_PERIPH_GPIOE
#endif

5.2.因为SPI1与SPI2这两个外设接口不在同一个总线上，所以需要对官方例程中出现外设时钟配置的地方进行修改，修改spi_flash.c文件中的函数，如下所示：

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void sFLASH_LowLevel_DeInit(void)
{
    GPIO_InitType GPIO_InitStructure;

    /*!< Disable the sFLASH_SPI  */
    SPI_Enable(sFLASH_SPI, DISABLE);

    /*!< DeInitializes the sFLASH_SPI */
    SPI_I2S_DeInit(sFLASH_SPI);

    /*!< sFLASH_SPI Periph clock disable */
    if (sFLASH_SPI_CLK == RCC_APB2_PERIPH_SPI1)
    {
        RCC_EnableAPB2PeriphClk(sFLASH_SPI_CLK, DISABLE);
    }
    else
    {
        RCC_EnableAPB1PeriphClk(sFLASH_SPI_CLK, DISABLE);
    }

    /*!< Configure sFLASH_SPI pins: SCK */
    GPIO_InitStructure.Pin       = sFLASH_SPI_SCK_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitPeripheral(sFLASH_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);

    /*!< Configure sFLASH_SPI pins: MISO */
    GPIO_InitStructure.Pin = sFLASH_SPI_MISO_PIN;
    GPIO_InitPeripheral(sFLASH_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);

    /*!< Configure sFLASH_SPI pins: MOSI */
    GPIO_InitStructure.Pin = sFLASH_SPI_MOSI_PIN;
    GPIO_InitPeripheral(sFLASH_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

    /*!< Configure sFLASH_CS_PIN pin: sFLASH Card CS pin */
    GPIO_InitStructure.Pin = sFLASH_CS_PIN;
    GPIO_InitPeripheral(sFLASH_CS_GPIO_PORT, &GPIO_InitStructure);
}

void sFLASH_LowLevel_Init(void)
{
    GPIO_InitType GPIO_InitStructure;

    /*!< sFLASH_SPI_CS_GPIO, sFLASH_SPI_MOSI_GPIO, sFLASH_SPI_MISO_GPIO
         and sFLASH_SPI_SCK_GPIO Periph clock enable */
    RCC_EnableAPB2PeriphClk(
        sFLASH_CS_GPIO_CLK | sFLASH_SPI_MOSI_GPIO_CLK | sFLASH_SPI_MISO_GPIO_CLK | sFLASH_SPI_SCK_GPIO_CLK, ENABLE);

    /*!< sFLASH_SPI Periph clock enable */
    if (sFLASH_SPI_CLK == RCC_APB2_PERIPH_SPI1)
    {
        RCC_EnableAPB2PeriphClk(sFLASH_SPI_CLK, ENABLE);
    }
    else
    {
        RCC_EnableAPB1PeriphClk(sFLASH_SPI_CLK, ENABLE);

        GPIO_ConfigPinRemap(GPIO_RMP2_SPI2, ENABLE);
    }

    /*!< Configure sFLASH_SPI pins: SCK */
    GPIO_InitStructure.Pin        = sFLASH_SPI_SCK_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
    GPIO_InitPeripheral(sFLASH_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);

    /*!< Configure sFLASH_SPI pins: MOSI */
    GPIO_InitStructure.Pin = sFLASH_SPI_MOSI_PIN;
    GPIO_InitPeripheral(sFLASH_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

    /*!< Configure sFLASH_SPI pins: MISO */
    GPIO_InitStructure.Pin       = sFLASH_SPI_MISO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitPeripheral(sFLASH_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);

    /*!< Configure sFLASH_CS_PIN pin: sFLASH Card CS pin */
    GPIO_InitStructure.Pin       = sFLASH_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitPeripheral(sFLASH_CS_GPIO_PORT, &GPIO_InitStructure);
}

5.3.注意事项：查看SPI2使用的引脚，需要看一下复用功能，需不需要重映射配置；上例中使用了PE10~PE13，是需要进行重映射配置，要不然就无法通讯了！

5.4.SPI2测试环境

5.5.SPI2测试结果

6.工程源代码

SPI_FLASH.zip (1.46 MB, 下载次数: 4)

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Jacktang

看来官方的SPI FLASH示例工程跑起来是没有问题的哈

【国民技术车规MCU N32A455开发板】04、通过SPI FLASH熟悉SPI通讯（SPI1 & SPI2) [复制链接]

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