Serial Port Complete

... Serial Port Complete COM Ports, USB Virtual COM Ports, and Ports for Embedded Systems Second Edition Jan Axelson Lakeview Research LLC Madison, WI 53704 Serial Port Complete: COM Ports, ... built-in serial (COM) ports, the ports are easy to add via USB converters. With converters, the number of expansion slots no longer limits the number of serial ports a system can have. The S...

Ngày tải lên: 06/11/2013, 08:15

... 3 Serial Port Programming There are four operations that must happen in proper order to successfully communicate over the serial port. These are to open the serial port, configure the serial port, ... access the serial port, either by giving the user permission to the serial port, or by changing the per- missions of the program to allow access to the serial port. Code to...

Ngày tải lên: 05/11/2013, 20:15

... Ports Configuring 6 Port Options Drivers Adding a Port Port Hardware 9 Connectors The Circuits Inside Cables Multiple Uses for One Port 11 Security Keys Alternatives to the Parallel Port 13 Serial ... the Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Table of Contents I ntroduction ix 1 Essentials 1 Parallel Port Complete...

Ngày tải lên: 15/12/2013, 13:15

... clues. 1 0  Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Table 2-2: Parallel port bits, arranged by register. Accessing Ports Parallel Port Complete  1 9 Data ... port isn't the best solution for every project. These are some of the alternatives: Serial Interfaces Parallel Port Complete Essentials One large group...

Ngày tải lên: 15/12/2013, 13:15

... 0; Pascal programmers can use the port function to access parallel ports. To write AAh to a Data port at 378h: port[ 378h]:=AAh To read a Status port at 379h: value: =port[ 379h] Delphi 2.0 The 32-bit ... ability. EPP and ECP Support A port that supports EPP or ECP modes of data transfer has the best chance for fast parallel -port transfers. An SPP requires four port writes to rea...

Ngày tải lên: 15/12/2013, 13:15

... remove this watermark. Programming Issues Ports that support ECP mode can use direct memory access (DMA), where data can transfer between memory and a port without intervention by the CPU. The DMA ... in sequence to the port. Data Compression For the fastest data transfers, compressing the data in software can reduce the number of bytes to write. Even though the number of port writes pe...

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15

Ngày tải lên: 24/12/2013, 19:15