QMC5883芯片I2C驱动开发指南

这个芯片纯国产挺好用的，电路很好设计，我这垃圾焊功，纯手焊，，居然能用。

第一部分 硬件连接

画的很简陋，看看就可以了。

第二部分 软件驱动

I2C的具体时序实现需要自己搞定！！

2.1 I2C读写寄存器功能

u8 QMC5883_ReadReg(u8 dAddr, u8 Reg)
{
    u8 Value = 0;
    //1.启动IIC
    IIC_Start();
    //2.写设备地址
    IIC_Send_Byte((dAddr << 1)|0);
    //3.wait
    if(IIC_Wait_Ack())
    {
        IIC_Stop();
    }
    //4.寄存器地址
    IIC_Send_Byte(Reg);
    //5.wait
    if(IIC_Wait_Ack())
    {
        IIC_Stop();
    }
    //6.启动IIC
    IIC_Start();
    //7.设备地址
    IIC_Send_Byte((dAddr << 1)|1);
    //8.wait read ack
    if(IIC_Wait_Ack())
    {
        IIC_Stop();
    }
    Value = IIC_Read_Byte(0);
    //9.stop
    IIC_Stop();
    return Value;
}

void QMC5883_WriteReg(u8 dAddr, u8 Reg, u8 Value)
{
    //1.启动IIC
    IIC_Start();
    //2.写设备地址
    IIC_Send_Byte((dAddr << 1)|0);
    //3.wait
    while(IIC_Wait_Ack());
    //4.写寄存器地址
    IIC_Send_Byte(Reg);
    //5.wait
    IIC_Wait_Ack();
    //6.写value
    IIC_Send_Byte(Value);
    //7.wait
    IIC_Wait_Ack();
    //8.stop
    IIC_Stop();
}

2.2 驱动部分

void QMC5883_Init()
{
    u8 uChipID = 0;
   
    // 1.Device Reset & check Device
    //QMC5883_WriteReg(QMC5883_DEV,0x0A,0x41); //PowerReset
    QMC5883_WriteReg(QMC5883_DEV,0x0B,0x01); //PowerReset
    QMC5883_WriteReg(QMC5883_DEV,0x20,0x40); //PowerReset
    QMC5883_WriteReg(QMC5883_DEV,0x21,0x01); //PowerReset
    QMC5883_WriteReg(QMC5883_DEV,0x09,0x0d); //PowerReset
    delay_ms(5000);                           // wait stable
    while( uChipID!= 0xFF) 
    {   
        uChipID = QMC5883_ReadReg(QMC5883_DEV,0x0D); // Read ID
        delay_ms(2000);        // device check
    }
    printf("QMC5883 check Pass!:deviceID = 0x%x \r\n",uChipID);
}
void QMC5883_ReadMuti(u8 dAddr, u8 Len, u8 Reg, u8* Buff)
{
    u8 i = 0;
    for(i = 0;i<Len; i++)
    {
        *(Buff+i) = QMC5883_ReadReg(dAddr,Reg+i);
    }   
}
void QMC5883_dataGet(void)
{
    QMC5883_ReadMuti(QMC5883_DEV,6,0x0,uQMC5883_Data.buffer);// 读取数据部分是前六个寄存器0x0~0x5
    printf("%d %d %d ", \
    (s16)(uQMC5883_Data.stData.AX), (s16)(uQMC5883_Data.stData.AY), (s16)(uQMC5883_Data.stData.AZ));
    /*printf("AX=%d AY=%d AZ=%d ", \
    (s16)(uQMC5883_Data.stData.AX), (s16)(uQMC5883_Data.stData.AY), (s16)(uQMC5883_Data.stData.AZ));*/
}