Parallel port: Difference between revisions

 

 

In Standard (or Compatibility) mode, data is sent to the connected device by writing the byte to the data port, then pulsing the STROBE signal. This pulse informs the device that data is ready to be read. The device will respond by raising its BUSY signal and then reading the data and performing some processing on it. Once this processing is complete, the device will lower the Busy signal and may raise a brief ACK signal to indicate that it has finished.

 

// Sends a byte to the printer

void Parallel_SendByte( unsigned char pData )

// Wait for the printer to be receptive

{

Timer_Delay( 10 );

// Now put the data onto the data lines

// Now pulse the strobe line to tell the printer to read the data

lControl = Ports_In8( 0x37A);

Timer_Delay( 10 );

// Now wait for the printer to finish processing

{

Timer_Delay( 10 );

}

}

 

 

 

[[File:Win32_lpthandler_exe_0000.jpg]]

 

/*

In short we only need:

 

*/

 

//their bits:

///

 

//Now send an value betwewen 0 and 255 to the data port:

///

 

 

 

 

[[Category:Common Devices]]