//获得控制端口地址
WORD m_nport=(WORD)0x37A;
//获得控制端口的值,保持高位值不变,将要输出的值从低4位输出,且使连接器上的电位状态与想输出的值一致
DWORD temp_dwPortVal;
unsigned int temp_aa;
GetPortVal(m_nport, &temp_dwPortVal, 1); //reads a BYTE value from an I/O port
temp_aa=(unsigned int)temp_dwPortVal;
temp_aa=temp_aa&0x0F0; //取低8位值,将低4位置为0;高4位不变;
temp_aa=temp_aa^0x0B; //将低4位中C0、C1、C3置为1,C2置为0;高4位不变;
//获得要写入控制端口的值WriteValue(数据范围为0~15)
unsigned int WriValue;
WriValue=WriteValue&0x0F; //取低4位;
temp_aa=temp_aa^WriValue; //将写入值的低4位中的C0、C1、C3取反,C2位不变,高4位保持端口值不变
//获得端口地址
WORD m_nportData=(WORD)0x378;
WORD m_nportControl=(WORD)0x37A;
//获得要写入端口的值WriteValue(数据范围为0~4095)
DWORD m_nValue=(DWORD)(WriteValue&0x0FF);//取低8位值
SetPortVal(m_nportData, m_nValue, 1);//write a BYTE value to Data port
DWORD temp_dwPortVal;
unsigned int temp_aa;
GetPortVal(m_nportControl, &temp_dwPortVal, 1); //reads a BYTE value from an I/O port
temp_aa=(unsigned int)temp_dwPortVal;
temp_aa=temp_aa&0x0F0; //取低8位值,将低4位置为0;高4位不变;
temp_aa=temp_aa^0x0B; //将低4位中C0、C1、C3置为1,C2置为0;高4位不变;
unsigned int ValueGet=0;
//获得端口地址
WORD m_nportState=(WORD)0x379;
WORD m_nportControl=(WORD)0x37A;
//Read State Port
DWORD dwPortVal;
unsigned int ValueState=0;
GetPortVal(m_nportState, &dwPortVal, 1);
ValueState=dwPortVal;
ValueState=ValueState^0x80; //保持得到的State值与连接器处的值一直;
ValueState=ValueState&0xF8; //去掉S0 ~S2位;
ValueState=ValueState<<1; //左移1位,将S7~S3变为高5位
//Read control Port
//========== 将C0~C3位置1,即使连接器上是高电平 ,使控制端口为输入端口=====
//获得数据端口地址
WORD m_nport=(WORD)0x378;
//获得要写入数据端口的值WriteValue(数据范围为0~255)
DWORD m_nValue=(DWORD)WriteValue;
//调用WinIo库函数SetPortVal写端口值
SetPortVal(m_nport, m_nValue, 1);//write a BYTE value to an I/O port
(2):控制端口数字输出的VC实现