pcf8563.c

用SL811做USB主机的源码

/*
  Name:	***write_pcf8563***read_pcf8563***
  Author:zhouxianfa. 
  Date:2004-7-16.
  Model_write:start+SLA_W+address+(data0...dataN)+stop.
  Model_read:start+SLA_W+address+repeat_start+SLA_R+(RECEIVE data0...dataN)+stop.
  Known:SLA_W=0a2h,address=写入PCF8563数据串的起始地址(读取数据的起始地址).
  		SLA_W是所选器件的系统地址,SLA_R=SLA_W+1.
		ACK在发送数据时不理会,系统自处理.
		  write_pcf8563时,ACK信号不必理会.
		  read_pcf8563 时,在收到ST的数据后,前n-1个数据发送ACK(TWEA=1),n数据发送NACK(TWEA=0).
		  
  For PCF8563:
  	  00h:控制/状态寄存器1.		bit7=test,bit5=stop,bit3=testC.
	  01h:控制/状态寄存器2. 	bit4=Ti/Tp,bit3=AF,bit2=TF,bit1=Aie,bit0=Tie.
	  02h:second.				VL+second_value.
	  03h:minute.				(bit6...bit0)=minute_value.
	  04h:hour.					(bit6...bit0)=hour_value.
	  05h:data.					(bit6...bit0)=data_value.
	  06h:day.					(bit2...bit0)=day_value.
	  07h:month/century.		bit7=C,(bit4...bit0)=(01~12)BCD
	  08h:year.					(bit7...bit0)=year_value.
	  09h:warring_minute.		bit7=AE,(bit6...bit0)=warring_value.
	  0ah:warring_hour.			bit7=AE,(bit5...bit0)=warring_value.
	  0bh:warring_data.			bit7=AE,(bit5...bit0)=warring_value.
	  0ch:warring_day.			bit7=AE,bit2...bit0=warring_value.
	  0dh:CLKOUT输出寄存器.		bit7=FE,bit1=FD1,bit0=FD0.
	  0eh:定时器控制寄存器.		bit7=TE,bit1=TD1,bit0=TD0.
	  0fh:定时器倒数数值寄存器.		定时器倒计数数值(二进制).
	  (attention:The values are BCD.)
  
*/
//send (00h---08h),启动时钟|设定时间2004-7-Friday-16-14-23-15.
unsigned char PCF_register[16]={0,0,15,23,14,16,5,7,04};
void write_pcf8563(unsigned char address,unsigned char number)
{unsigned char i;
//START
	 TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN);		  //发送START
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x08) goto error;				  //TWSR=0x08出错处理.
//SLA_W
	 TWDR=0xa2;								  	  //装入SLA_W.
	 TWCR&=~(1<<7);								  //TWINT=0,启动发送.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x18) goto error;				  //TWSR=0x18出错处理.
//address
	 TWDR=address;								  //装入数据起始地址address.
	 TWCR&=~(1<<7);								  //TWINT=0,启动发送.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x28) goto error;				  //TWSR=0x28出错处理.
//datas	 
  	 for (i=0;i<number;i++)
	 	 {	 TWDR=PCF_register[i];				  //装入数据i.
	 	 	 TWCR&=~(1<<7);						  //TWINT=0,启动发送.
	 		 while (!(TWCR&(1<<7))) ;			  //wait_for_TWINT.	 
	 		 if ((TWSR&0xf8)==0x28) goto error;		  //TWSR=0x28出错处理.
		 }
//STOP		 
error:	 	 							 		  //如果接收的应答信号不对,立即释放总线.
	 TWCR=(1<<TWINT)|(1<<TWSTO)|(1<<TWEN);		  //发送STOP.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	   	 }


void read_pcf8563(unsigned char address,unsigned char number)
{unsigned char i;
//START
	 TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN);		  //发送START
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x08) goto error;				  //TWSR=0x08出错处理.
//SLA_W
	 TWDR=0xa2;								  	  //装入SLA_W.
	 TWCR&=~(1<<7);								  //TWINT=0,启动发送.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x18) goto error;				  //TWSR=0x18出错处理.
//address
	 TWDR=address;								  //装入数据起始地址address.
	 TWCR&=~(1<<7);								  //TWINT=0,启动发送.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x28) goto error;				  //TWSR=0x28出错处理.
//START
	 TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN);		  //发送重复START
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x10) goto error;				  //TWSR=0x10出错处理.
//SLA_W
	 TWDR=0xa2+1;								  //装入SLA_R,(setb SLA_W.0),进入读模式.
	 TWCR&=~(1<<7);								  //TWINT=0,启动发送.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 if ((TWSR&0xf8)==0x40) goto error;				  //TWSR=0x40出错处理.
	 
	 
//datas	 
  	 TWCR &=(1<<TWEA);			 				  //前n-1个发送ACK
	 for (i=0;i<number-1;i++)
	 	 {	 while (!(TWCR&(1<<7))) ;			  //wait_for_TWINT.	 
	 		 PCF_register[i]=TWDR;				  //装入数据(0...n-1).
	 	 	 if ((TWSR&0xf8)==0x50) goto error;	  	  //TWSR=0x50出错处理.
			 	TWCR=(1<<TWINT);		  	  	  //发送ACK.
		  }
	 TWCR &=(1<<TWEA);							  //最后一个发送NACK.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 PCF_register[i]=TWDR;				  		  //装入数据n.
	 if ((TWSR&0xf8)==0x50) goto error;	  	  	  //TWSR=0x50出错处理.
			TWCR|=(1<<TWINT);  				  	  	  //发送 NACK.	  
		  	 
			 
//STOP		 
error:	 	 							 		  //如果接收的应答信号不对,立即释放总线.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
	 TWCR=(1<<TWINT)|(1<<TWSTO)|(1<<TWEN);		  //发送STOP,End the process.
	 while (!(TWCR&(1<<7))) ;			  		  //wait_for_TWINT.	 
}