电子设计程序模块 MMA7455.rar

#include "MMA7455.H" //sbit sda=P2^3; //I2C 数据传送位 //sbit scl=P2^4; //I2C 时钟传送位 unsigned char sign_flag; //输出数据正负标记位 void IIC_MMA7455_init() { IIC_start(); IIC_writebyte(MMA7455_ADDER_WRITE); //1. 在IIC总线上寻址MMA7455 while(IIC_respons()); IIC_writebyte(MMA7455_Mode_Control_Register); //2. 模式设置寄存器寻址 while(IIC_respons()); IIC_writebyte(MMA7455_2G_Measurement_Mode); //3. 模式寄存器数据写入 while(IIC_respons()); IIC_stop(); IIC_start(); IIC_writebyte(MMA7455_ADDER_WRITE); //1. 在IIC总线上寻址MMA7455 while(IIC_respons()); IIC_writebyte(MMA7455_Mode_Control_Register); //2. 模式设置寄存器寻址 while(IIC_respons()); IIC_writebyte(MMA7455_2G_Measurement_Mode); //3. 模式寄存器数据写入 while(IIC_respons()); IIC_stop(); } void IIC_MMA7455_writedata(uchar byte_add,uchar wdata)//函数功能：按地址写入一字节数据 { unsigned char temp; temp=(IIC_WRITE<<1); IIC_start(); IIC_writebyte(temp); while(IIC_respons()); IIC_writebyte(byte_add); while(IIC_respons()); IIC_writebyte(wdata); while(IIC_respons()); IIC_stop(); } unsigned char IIC_MMA7455_readdata(uchar byte_add) //函数功能：按地址读出一字节数据 { unsigned char temp; char x_y_z ; temp=(IIC_WRITE<<1); IIC_start(); IIC_writebyte(0x3A); while(IIC_respons()); IIC_writebyte(byte_add); while(IIC_respons()); temp=((IIC_READ<<1)|0x01); IIC_start(); IIC_writebyte(0x3B); while(IIC_respons()); x_y_z=IIC_readbyte(); while(IIC_respons()); IIC_stop(); return x_y_z; } unsigned char IIC_MMA7455_test() { unsigned char temp; for(temp=255;temp<=1;temp--); IIC_MMA7455_writedata(0x16,0x05); for(temp=255;temp<=1;temp--); temp=IIC_MMA7455_readdata(0x16); if(temp==0x05) {return 1;} else{return 0;} } unsigned char IIC_MMA7455_checkbusy() { unsigned char temp; temp=IIC_MMA7455_readdata(MMA7455_READ_STATUS); if((temp&0x01)==1) { return 1; } else { return 0; } } unsigned char IIC_MMA7455_getvalue(unsigned char address_byte) { unsigned char temp; while(!IIC_MMA7455_checkbusy()); temp=IIC_MMA7455_readdata(address_byte); if((temp&0x80)==0x00) { sign_flag=0; return temp; } else { sign_flag=1; temp=temp-0x01; temp=~temp; return temp; } } unsigned char IIC_MMA7455_getaverage(unsigned char address_byte) { unsigned char num,temp; unsigned int temps=0x00; for(num=50;num>0;num--) { temp=IIC_MMA7455_getvalue(address_byte); temps=temps+temp; } temp=temps/50; return temp; } unsigned char IIC_MMA7455_getacceleration(unsigned char address_byte) { unsigned int temp; temp=IIC_MMA7455_getaverage(address_byte); temp=temp*200; temp=temp>>7; return temp; } unsigned char IIC_MMA7455_calibrate_X() { unsigned char tempX,time; while(!IIC_MMA7455_checkbusy()); tempX=IIC_MMA7455_readdata(MMA7455_READ_X); for(time=100;time>0;time--) { if((tempX&0x80)==0x00) { tempX=tempX+tempX; tempX=~tempX+1; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempX); } else { tempX=tempX-1; tempX=~tempX; tempX=tempX+tempX; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempX); } tempX=IIC_MMA7455_readdata(MMA7455_READ_X); if((tempX<=10)&&(tempX>=-10)){break;} } return 1; } unsigned char IIC_MMA7455_calibrate_Y() { unsigned char tempY,time; while(!IIC_MMA7455_checkbusy()); tempY=IIC_MMA7455_readdata(MMA7455_READ_Y); for(time=100;time>0;time--) { if((tempY&0x80)==0x00) { tempY=tempY+tempY; tempY=~tempY+1; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempY); } else { tempY=tempY-1; tempY=~tempY; tempY=tempY+tempY; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempY); } tempY=IIC_MMA7455_readdata(MMA7455_READ_Y); if((tempY<=10)&&(tempY>=-10)){break;} } return 1; } unsigned char IIC_MMA7455_calibrate_Z() { unsigned char tempZ,time; while(!IIC_MMA7455_checkbusy()); tempZ=IIC_MMA7455_readdata(MMA7455_READ_Z); for(time=100;time>0;time--) { if((tempZ&0x80)==0x00) { tempZ=64-tempZ; if(tempZ==0){break;} if(tempZ>0) { tempZ=tempZ+tempZ; tempZ=~tempZ+1; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempZ); } if(tempZ<0) { tempZ=tempZ+tempZ; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempZ); } } else { tempZ=tempZ-1; tempZ=~tempZ; tempZ=64+tempZ; tempZ=tempZ+tempZ; IIC_MMA7455_writedata(MMA7455_RW_XOFFL,tempZ); } tempZ=IIC_MMA7455_readdata(MMA7455_READ_Z); if((tempZ<=70)&&(tempZ>=50)){break;} } return 1; }