i2c.h

I2C的程序,用于PCF8563上一定可以通过的

//==========I2C时序==========
void delay(unsigned int i)//延时程序
{
 for(;i>0;i--);
}
void I2C_start()//I2C起始函数
{
 DDRC |= 0x30;//SDA，SCL设置为输出
 SDA_PORT4 |= BIT(4);
 delay(6);
 SCL_PORT5 |= BIT(5);
 delay(6);
 SDA_PORT4 &= ~BIT(4);
 delay(6);
 SCL_PORT5 &= ~BIT(5);
 delay(6);
}
void I2C_stop()  //I2C停止函数
{
 DDRC |= 0x30;		  //SDA，SCL设置为输出
 SDA_PORT4 &= ~BIT(4);
 delay(6);
 SCL_PORT5 |= BIT(5);
 delay(6);
 SDA_PORT4 |= BIT(4);
 delay(6);
 SCL_PORT5 &= ~BIT(5);
 delay(6);
}
void noAck()  //I2C读数据,无作答
{
 DDRC |= BIT(4);
 DDRC |= BIT(5);
 //SDA_PORT4 &= ~BIT(4);	//不变化
 SDA_PORT4 |= BIT(4);
 delay(6);
 SCL_PORT5 |= BIT(5);
 delay(6);
 SCL_PORT5 &= ~BIT(5);
 delay(6);
}
uchar test_ack()//I2C检测应答
{
 uchar testnum = 20;
 DDRC |= BIT(5); 	 	//scl为输出
 DDRC &= ~BIT(4);       //sda为输入
 delay(6);
 SCL_PORT5 |= BIT(5);
 delay(6);
 while((PINC & 0x10))
 { 
    testnum--;
	if(!testnum)
	{ 
	   I2C_stop();
	   return(0);
	}   
 }
 SCL_PORT5 &= ~BIT(5);
 delay(6);
 return(1);
}
//写数据(一个字节)时序
void writeByte(uchar wbyte)
{
 uchar temp,i;
 DDRC |= BIT(4);	 //scl为输出
 DDRC |= BIT(5);	 //sda为输出
 for(i=8;i>0;i--)
 {
    temp = wbyte & 0x80;
	if(temp)
	   SDA_PORT4 |= BIT(4);
	else
	   SDA_PORT4 &= ~BIT(4);
	delay(6);
	SCL_PORT5 |= BIT(5);
	delay(6);
	SCL_PORT5 &= ~BIT(5);
	delay(6);
	wbyte = wbyte << 1;
 }
}
void writedata(uchar address,uchar wdata)  //向I2C写数据
{
 I2C_start();
 writeByte(0xA2);
 //test_ack();  //单个
 writeByte(address);
 //test_ack();
 writeByte(wdata);
 //test_ack();
 I2C_stop();
}

//读数据(一个字节)时序
uchar readByte()
{
 uchar i,rbyte,temp; 
 DDRC |= BIT(5);		//SCL输出，SDA输入
 DDRC &= ~BIT(4);
 for(i=8;i>0;i--)
 {
    SCL_PORT5 |= BIT(5);
	delay(6);
	delay(6);
	if((PINC & 0x10))
		temp = 1;
	else
	    temp = 0;
	rbyte = rbyte << 1;
	rbyte = rbyte | temp;
	delay(6);
	delay(6);
	SCL_PORT5 &= ~BIT(5);
	delay(6);
	delay(6);
 }
 return (rbyte);
}
uchar readdata(uchar address)  //从I2C苡片中读数据
{
 uchar temp;
 I2C_start();
 writeByte(0xA2);		
 test_ack();
 writeByte(address);
 test_ack();
 I2C_start();
 writeByte(0xA3);		
 test_ack();
 temp = readByte();
 noAck();
 I2C_stop();
 return (temp);
}
void pfc8563_init()   //I2C苡片初始化
{
 	writedata(0x00,0x00);	
	writedata(0x01,0x12);
	//writedata(0x00,0x20);
}
uchar pfc8563_read(uchar address,uchar var)//=I2C时序
{
  uchar temp,rdata;
  temp = readdata(address);
  temp = temp & var;
  rdata = temp & 0x0f;
  rdata = rdata + ((temp>>4)*10);
  return (rdata);
}
void pfc8563_write(uchar address,uchar wtime)
{
  uchar temp1,temp2;
  temp1 = wtime / 10;
  temp1 = temp1 << 4;
  temp2 = wtime % 10;
  temp1 = temp1 | temp2;
  writedata(address, temp1);
}
//==========I2C时序==========