stm32 spi读写tf卡

以下是使用STM32的SPI接口读写TF卡的基本步骤：

1. 配置SPI接口：设置SPI时钟、CPOL、CPHA、数据大小等参数，使能SPI接口。

2. 初始化TF卡：通过SPI接口向TF卡发送初始化命令，完成TF卡的初始化工作。

3. 发送读写命令：通过SPI接口向TF卡发送读写命令，指定读写地址和数据长度。

4. 数据传输：根据命令类型，通过SPI接口进行数据传输，读取或写入数据。

5. 关闭SPI接口：完成数据传输后，关闭SPI接口。

下面是一个简单的示例代码，使用SPI1和PB12引脚进行TF卡读写操作：

#include "stm32f10x.h"

#define SPIx SPI1
#define SPI_GPIO GPIOB
#define SPI_SCK_PIN GPIO_Pin_13
#define SPI_MISO_PIN GPIO_Pin_14
#define SPI_MOSI_PIN GPIO_Pin_15

#define CS_GPIO GPIOB
#define CS_PIN GPIO_Pin_12

void SPI_Configuration(void)
{
    SPI_InitTypeDef SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Pin = SPI_SCK_PIN | SPI_MOSI_PIN;

    GPIO_Init(SPI_GPIO, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Pin = SPI_MISO_PIN;

    GPIO_Init(SPI_GPIO, &GPIO_InitStructure);

    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_256;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_Init(SPIx, &SPI_InitStructure);

    SPI_Cmd(SPIx, ENABLE);
}

void CS_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(CS_GPIO, &GPIO_InitStructure);

    GPIO_SetBits(CS_GPIO, CS_PIN);
}

void TF_Init(void)
{
    uint8_t i;

    GPIO_ResetBits(CS_GPIO, CS_PIN);

    for (i = 0; i < 10; i++)
    {
        SPIx_ReadWriteByte(0xFF);
    }

    GPIO_SetBits(CS_GPIO, CS_PIN);
}

uint8_t SPIx_ReadWriteByte(uint8_t data)
{
    while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET)
        ;

    SPI_I2S_SendData(SPIx, data);

    while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET)
        ;

    return SPI_I2S_ReceiveData(SPIx);
}

void TF_Read_Block(uint32_t blockAddr, uint8_t *buf)
{
    uint16_t i;

    GPIO_ResetBits(CS_GPIO, CS_PIN);

    SPIx_ReadWriteByte(0xFF);
    SPIx_ReadWriteByte(0xFF);

    SPIx_ReadWriteByte(0x51);
    SPIx_ReadWriteByte((blockAddr >> 24) & 0xFF);
    SPIx_ReadWriteByte((blockAddr >> 16) & 0xFF);
    SPIx_ReadWriteByte((blockAddr >> 8) & 0xFF);
    SPIx_ReadWriteByte(blockAddr & 0xFF);
    SPIx_ReadWriteByte(0xFF);

    while (SPIx_ReadWriteByte(0xFF) != 0xFE);

    for (i = 0; i < 512; i++)
    {
        buf[i] = SPIx_ReadWriteByte(0xFF);
    }

    SPIx_ReadWriteByte(0xFF);
    SPIx_ReadWriteByte(0xFF);

    GPIO_SetBits(CS_GPIO, CS_PIN);
}

void TF_Write_Block(uint32_t blockAddr, const uint8_t *buf)
{
    uint16_t i;

    GPIO_ResetBits(CS_GPIO, CS_PIN);

    SPIx_ReadWriteByte(0xFF);
    SPIx_ReadWriteByte(0xFF);

    SPIx_ReadWriteByte(0x58);
    SPIx_ReadWriteByte((blockAddr >> 24) & 0xFF);
    SPIx_ReadWriteByte((blockAddr >> 16) & 0xFF);
    SPIx_ReadWriteByte((blockAddr >> 8) & 0xFF);
    SPIx_ReadWriteByte(blockAddr & 0xFF);
    SPIx_ReadWriteByte(0xFF);

    SPIx_ReadWriteByte(0xFE);

    for (i = 0; i < 512; i++)
    {
        SPIx_ReadWriteByte(buf[i]);
    }

    SPIx_ReadWriteByte(0xFF);
    SPIx_ReadWriteByte(0xFF);

    GPIO_SetBits(CS_GPIO, CS_PIN);
}

int main(void)
{
    uint8_t buf[512];

    SystemInit();
    SPI_Configuration();
    CS_Configuration();

    TF_Init();
    TF_Read_Block(0, buf);

    while (1)
        ;
}

在上面的代码中，使用了TF_Read_Block和TF_Write_Block分别读取和写入TF卡的一个512字节的数据块，可以根据需要修改代码进行扩展。