并口模拟IIC的经验之谈（8） count

yuyang911220

/*************************************/
//函数名称：IIC 读一个字符函数
/*************************************/
char port2iicbase::i2c_readbyte()
{
unsigned short count=8;
char d,e,f='\x0';
DWORD dwPortVal;while(count>0)
{
   SetPortVal(PORT1,0x07,1);/*scl 0, sda 1*/
   delay(1);/***/
   SetPortVal(PORT1,0x0f,1);/*scl 1, sda 1*/
   delay(1);
   GetPortVal(PORT2, &dwPortVal, 1);
   e = (char)dwPortVal;
   d=e>>4;
   d=d<<7;
   if(d=='\x80')
    d='\x1';
   f=f<<1;
   f=(f+d);                  //组合成字节
   count--;
}
return f;
}
/*************************************/
//函数名称：主机(并口)的发送应答
/*************************************/
void port2iicbase::i2c_ask()
{
SetPortVal(PORT1,0x05,1);/*scl 0, sda 0*/
delay(1);/**/
SetPortVal(PORT1,0x0d,1);/*scl 1, sda 0*/
delay(1);
SetPortVal(PORT1,0x05,1);/*scl 0, sda 0*/
delay(1);
}
//////////////////////////////////
//发送数据按钮
/////////////////////////////////
void Cport2iicdlg1::OnWriteok()
{
// TOD Add your control notification handler code here
port2iicbase port2iic;
char s[100];
char temp[3];
int len;
int i;
char m_cValue;
unsigned int WriValue=0;
int time = 0;
unsigned short c;
char d,e;
#ifdef _PORT2IIC
SetDlgItemText(IDC_WRITE_STATUS,"正在发送....");
GetDlgItem(IDC_EDIT_WRITE)->GetWindowText(s, 100);
len = strlen(s);
c = len/2;
e='\x0';
d='\x0';
i = 0;
c = 5;
//写一页
//启动开始信号;
port2iic.i2c_start();
//发送控制信息
//"\xa0" = 1010(A2)(A1)(A0)(R/W) 其中(R/w) = 0 写
//"\xa1" = 1010(A2)(A1)(A0)(R/W) 其中(R/w) = 1 读
port2iic.i2c_writebyte('\xa0');