哪位高手用过STM32模拟IIC和MPR121通信的程序

哪位高手用过STM32模拟IIC和MPR121通信的程序

//刚开始记着将SCL 和SDA引脚定义为输出，并且将SDA输入使能：

//如：GPIOB->PIDR ^=1<<27;DDRH3=1;DDRH4=1;

#include "common.h"

#include "include.h"

//#include "iic.h"

#define uchar unsigned char

int dis_datax,dis_datay,dis_dataz;

int IIC_Receive[6];

uchar IIC_ERROR;

#define SCL_out PTC10_OUT //定义IIC时钟线输出高低IO2

#define SDA_out PTC11_OUT //定义IIC数据线输出高低IO3

#define SCL_in PTC10_IN //定义IIC时钟线输入

#define SDA_in PTC11_IN //定义IIC数据线输入

#define SCL_dir DDRC10 //定义时钟线方向寄存器

#define SDA_dir DDRC11 //定义数据线方向寄存器

#define READ 0xD2 //定义L3G4200DIIC地址

void Delay1us(u8 x)

{

u16 i;

for(i=0;i<64*x;i++);

}



void IIC_START()

{

SDA_out=1;

Delay1us(1);

SCL_out=1;

Delay1us(5);

SDA_out=0;

Delay1us(5);

SCL_out=0;

Delay1us(2);

}

void IIC_STOP()

{

SDA_out=0;

Delay1us(1);

SCL_out=1;

Delay1us(5);

SDA_out=1;

Delay1us(4);

}

void IIC_Send_ack()

{

SDA_out=1;

Delay1us(1);

SCL_out=1;

Delay1us(5);

SCL_out=0;

Delay1us(2);

}

void IIC_Check_ack()

{

Delay1us(3);

SCL_out=0;

Delay1us(3);

SDA_dir=0;

SDA_in=1;

Delay1us(3);

SCL_out=1;

Delay1us(5);

if(SDA_in==1)

IIC_ERROR=1;

else

IIC_ERROR=0;

SCL_out=0;

Delay1us(3);

SDA_dir=1;

}

//

void IIC_Send1byte(uchar data)

{

unsigned int i=8;

uchar m=data;

uchar temp;

for(i=8;i>0;i--)

{

temp=m&0x80;

if(temp==0x80)

SDA_out=1;

else

SDA_out=0;

Delay1us(5);

SCL_out=1;

Delay1us(5);

SCL_out=0;

m=m<<1;

}

}

//

uchar IIC_Receive1byte()

{

int i=8;

uchar j=0;

SDA_dir=0;

SDA_in=1;

for(i=8;i>0;i--)

{

SDA_in=1;

Delay1us(3);

SCL_out=1;

Delay1us(5);

if(SDA_in==1)

j=j|0x01;

else

j=j;

SCL_out=0;

if(i!=1)

{

j=j<<1;

}

}

SDA_dir=1;

return j;

}

// *****通过IIC总线向某一寄存器写入一个字节数据********

void IIC_write(uchar add,uchar mem,uchar data) // 写数据（器件地址，寄存器地址，数据）

{

IIC_START();

IIC_Send1byte(add);

IIC_Check_ack();

IIC_Send1byte(mem);

IIC_Check_ack();

IIC_Send1byte(data);

IIC_Check_ack();

IIC_STOP();

}

//

void L3G4200D_Init()

{

IIC_write(READ,0x20, 0x8F);

IIC_write(READ,0x21, 0x00);

IIC_write(READ,0x22, 0x08);

IIC_write(READ,0x23, 0x36 );

IIC_write(READ,0x24, 0x00);

}

int IIC_Read(uchar add,uchar mem) // 读数据（器件地址，寄存器地址)

{

int data;

IIC_START();

IIC_Send1byte(add);

IIC_Check_ack();

IIC_Send1byte(mem);

IIC_Check_ack();

IIC_START();

IIC_Send1byte(add+1);

IIC_Check_ack();

data=IIC_Receive1byte();

IIC_Send_ack();

IIC_STOP();

return data;

}

void GET_AngleSpeed()

{

IIC_Receive[0]=IIC_Read(READ,0x28); // x

IIC_Receive[1]=IIC_Read(READ,0x29); //

dis_datax=(IIC_Receive[1]<<8)+IIC_Receive[0];

IIC_Receive[2]=IIC_Read(READ,0x2A); // Y

IIC_Receive[3]=IIC_Read(READ,0x2B); //数据合成

dis_datay=(IIC_Receive[3]<<8)+IIC_Receive[2]; //因为经过了自检，初始后波形更好，但是不在0位

IIC_Receive[4]=IIC_Read(READ,0x2C); // Z

IIC_Receive[5]=IIC_Read(READ,0x2D); //

dis_dataz=(IIC_Receive[5]<<8)+IIC_Receive[4]; //

}