RT-THREAD 2.1.0 SPI FLASH FATFS 文件系统问题

发布于 2016-11-29 15:01:21 浏览：2483 订阅该版

2 个回答

jackedison911 2017-06-28

这家伙很懒，什么也没写！

参考此链接的内容：[http://blog.csdn.net/flydream0/article/details/10285581](http://blog.csdn.net/flydream0/article/details/10285581)
我按照这个移植成功，但是细节还要自己去摸索。初始化以及操作函数在stm32f20x_40x_spi.c里。

```
static rt_err_t configure(struct rt_spi_device* device,
                          struct rt_spi_configuration* configuration)
{
    struct stm32_spi_bus * stm32_spi_bus = (struct stm32_spi_bus *)device->bus;
    SPI_InitTypeDef SPI_InitStructure;

SPI_StructInit(&SPI_InitStructure);

/* data_width */
    if(configuration->data_width <= 8)
    {
        SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    }
    else if(configuration->data_width <= 16)
    {
        SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    }
    else
    {
        return RT_EIO;
    }

/* baudrate */
    {
        uint32_t SPI_APB_CLOCK;
        uint32_t stm32_spi_max_clock;
        uint32_t max_hz;

stm32_spi_max_clock = 18000000;
        max_hz = configuration->max_hz;
#ifdef STM32F4XX
        stm32_spi_max_clock = 37500000;
#elif STM32F2XX
        stm32_spi_max_clock = 30000000;
#endif

if(max_hz > stm32_spi_max_clock)
        {
            max_hz = stm32_spi_max_clock;
        }

SPI_APB_CLOCK = SystemCoreClock / 4;

/* STM32F2xx SPI MAX 30Mhz */
        /* STM32F4xx SPI MAX 37.5Mhz */
        if(max_hz >= SPI_APB_CLOCK/2 && SPI_APB_CLOCK/2 <= 30000000)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
        }
        else if(max_hz >= SPI_APB_CLOCK/4)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
        }
        else if(max_hz >= SPI_APB_CLOCK/8)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
        }
        else if(max_hz >= SPI_APB_CLOCK/16)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
        }
        else if(max_hz >= SPI_APB_CLOCK/32)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;
        }
        else if(max_hz >= SPI_APB_CLOCK/64)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
        }
        else if(max_hz >= SPI_APB_CLOCK/128)
        {
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
        }
        else
        {
            /*  min prescaler 256 */
            SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
        }
    } /* baudrate */

/* CPOL */
    if(configuration->mode & RT_SPI_CPOL)
    {
        SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    }
    else
    {
        SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    }
    /* CPHA */
    if(configuration->mode & RT_SPI_CPHA)
    {
        SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    }
    else
    {
        SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    }
    /* MSB or LSB */
    if(configuration->mode & RT_SPI_MSB)
    {
        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    }
    else
    {
        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
    }
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_NSS  = SPI_NSS_Soft;

/* init SPI */
    SPI_I2S_DeInit(stm32_spi_bus->SPI);
    SPI_Init(stm32_spi_bus->SPI, &SPI_InitStructure);
    /* Enable SPI_MASTER */
    SPI_Cmd(stm32_spi_bus->SPI, ENABLE);
    SPI_CalculateCRC(stm32_spi_bus->SPI, DISABLE);

return RT_EOK;
};
```