用stm32f103写一段MFRCC522的驱动代码

好的，下面是一个简单的MFRC522驱动代码，适用于STM32F103系列芯片。

首先需要定义MFRC522芯片的一些寄存器地址和命令：

#define MFRC522_REG_COMMAND      0x01 // Command register
#define MFRC522_REG_FIFO         0x09 // FIFO buffer
#define MFRC522_REG_STATUS       0x0A // Status register
#define MFRC522_REG_MODE         0x11 // Control register
#define MFRC522_CMD_IDLE         0x00 // No action, cancels current command execution
#define MFRC522_CMD_AUTHENT      0x0E // Authentication key
#define MFRC522_CMD_RECEIVE      0x08 // Receive data
#define MFRC522_CMD_TRANSMIT     0x04 // Transmit data
#define MFRC522_CMD_TRANSCEIVE   0x0C // Transmit and receive data
#define MFRC522_MODE_MIFARE      0x00 // Mifare standard authentication

接下来定义一些函数来操作MFRC522芯片：

void MFRC522_Reset(void)
{
    GPIO_ResetBits(GPIOA, GPIO_Pin_3); // Reset the MFRC522 by setting the Reset pin low
    Delay_Ms(50); // Wait for the MFRC522 to complete the reset process
    GPIO_SetBits(GPIOA, GPIO_Pin_3); // Release the Reset pin
}

uint8_t MFRC522_Read(uint8_t addr)
{
    uint8_t data;
    SPI_CS_LOW(); // Select the MFRC522 by setting the CS pin low
    SPI_SendByte(addr << 1 | 0x80); // Send the address with the read bit set
    data = SPI_ReceiveByte(); // Receive the data
    SPI_CS_HIGH(); // Deselect the MFRC522 by setting the CS pin high
    return data;
}

void MFRC522_Write(uint8_t addr, uint8_t data)
{
    SPI_CS_LOW(); // Select the MFRC522 by setting the CS pin low
    SPI_SendByte(addr << 1 & 0x7E); // Send the address with the write bit cleared
    SPI_SendByte(data); // Send the data
    SPI_CS_HIGH(); // Deselect the MFRC522 by setting the CS pin high
}

void MFRC522_AntennaOn(void)
{
    uint8_t value = MFRC522_Read(MFRC522_REG_MODE);
    if ((value & 0x03) != 0x03) {
        MFRC522_Write(MFRC522_REG_MODE, value | 0x03);
    }
}

void MFRC522_AntennaOff(void)
{
    MFRC522_Write(MFRC522_REG_MODE, MFRC522_Read(MFRC522_REG_MODE) & ~0x03);
}

void MFRC522_Init(void)
{
    MFRC522_Reset(); // Reset the MFRC522
    MFRC522_Write(MFRC522_REG_COMMAND, MFRC522_CMD_IDLE); // Stop any currently executing command
    MFRC522_Write(MFRC522_REG_MODE, MFRC522_MODE_MIFARE); // Set the MFRC522 to Mifare mode
    MFRC522_AntennaOn(); // Turn on the antenna
}

最后在主函数中调用初始化函数和其他需要的函数即可：

int main(void)
{
    SPI_Config(); // Configure the SPI interface
    MFRC522_Init(); // Initialize the MFRC522
    while (1) {
        // Your code here
    }
}

以上代码只是一个简单的示例，具体实现还需要根据实际需求进行调整和完善。