红牛板Flash驱动AT45D161D--硬件资源初始化

最新推荐文章于 2024-04-29 14:30:59 发布

yesongldz

最新推荐文章于 2024-04-29 14:30:59 发布

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分类专栏：嵌入式文章标签： flash ext cmd

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//GPIO初始化

void Ext_Flash_GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable SPI and GPIO clocks */
    RCC_APB2PeriphClockCmd( SPI_FLASH_GROUP_CLK, ENABLE);

    /* Configure SPI pins: SCK, MISO and MOSI */
    GPIO_InitStructure.GPIO_Pin = SPI_FLASH_PIN_SCK | SPI_FLASH_PIN_MISO | SPI_FLASH_PIN_MOSI;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(SPI_FLASH_GPIO_GROUP, &GPIO_InitStructure);

    /* Configure I/O for Flash Chip select */
    GPIO_InitStructure.GPIO_Pin = SPI_FLASH_CS;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(SPI_FLASH_GPIO_GROUP, &GPIO_InitStructure);

    /* Deselect the FLASH: Chip Select high */
    SPI_FLASH_CS_HIGH();
}
//SPI初始化
void Ext_Flash_SPI_Configuration(void)
{
    SPI_InitTypeDef SPI_InitStructure;

    /* Enable SPI and GPIO clocks */
    RCC_APB2PeriphClockCmd(SPI_FLASH_CLK , ENABLE);

    /* SPI 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;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI_FLASH, &SPI_InitStructure);

    /* Enable the SPI */
    SPI_Cmd(SPI_FLASH, ENABLE);
}

//硬件资源初始化
void Ext_Flash_Driver_Init(void)
{
    Ext_Flash_GPIO_Configuration();
    Ext_Flash_SPI_Configuration();
}