i2c.#3

美新公司加速度芯片MXC6020,IIC接口 用C8051f320自带IIC控制器对该加速度芯片进行读写操作,并带信号处理算法

#include "MEMSIC.h"


uint8 xdata Temp0;
uint8 xdata Temp1;
uint8 xdata Temp2;
uint8 xdata Temp3;
int16 xdata Ax;
int16 xdata Ay;

void SMBus_Initial(void)
{
    SMB0CF = 0x54;
	SMB0CF |= 0x80;
}


void Read_Acc (void)					//read acceleration
{
	
    SMB0CF &= 0x7f;
    SMB0CF |= 0x80;
	STA = 1;//打开启动信号
	
	while(SI != 1);//等待启动中断
	if( (SMB0CN & 0xf0) == 0xe0 )
	{
	    SMB0DAT = 0x20;//地址+写
	    STA = 0;//关闭启动信号
	    SI = 0;//中断清除
	}


	while(SI != 1);//等待 地址+写 中断
	if( SMB0CN == 0xc3 )
	{
	    SMB0DAT = 0x01;//输入将访问地址
	    SI = 0;//中断清除
	}


	while(SI != 1);//等待 输入将访问地址 中断
	if( SMB0CN == 0xc3 )
	{
	    STA = 1;
	    STO = 1;//STOP + START
	    SI = 0;//clear interrupt
	}








    

	while(SI != 1);
	if( (SMB0CN & 0xf0) == 0xe0 )
	{
	    SMB0DAT = 0x21;//address + read
	    STA = 0;//clear start signal
	    SI = 0;//clear interrupt
	}


	while(SI != 1);
	if( SMB0CN == 0xc3 )
	{
	    SI = 0;// master send  convert to master receive
	}


    while(SI != 1);
	if( (SMB0CN & 0xf8) == 0x88 )
	{
		Temp0 = SMB0DAT;//receive the AxH
		ACK = 1;//send acknowledge
		SI = 0;//clear interrupe
	}


    while(SI != 1);
	if( (SMB0CN & 0xf8) == 0x88 )
	{
		Temp1 = SMB0DAT;//receive the AxL
		ACK = 1;//send acknowledge
		SI = 0;//clear interrupe
	}


    while(SI != 1);
	if( (SMB0CN & 0xf8) == 0x88 )
	{
		Temp2 = SMB0DAT;//receive the AyH
		ACK = 1;
		SI = 0;
	}
	

    while(SI != 1);
	if( (SMB0CN & 0xf8) == 0x88 )
	{
		Temp3 = SMB0DAT;//receive the AyL
		ACK = 1;
		SI = 0;
	}


	while(SI != 1);
	if( (SMB0CN & 0xf8) == 0x88 )
	{
		ACK = 0;//send NonACK
		STO = 1;//send Stop signal
		SI = 0;//clear interrupt
	}


	Ax=Temp0;
	Ax=Ax<<8;
	Ax+=Temp1;
	Ay=Temp2;
	Ay=Ay<<8;
	Ay+=Temp3;
}