Download The Windows Serial Port Programming Handbook by Ying Bai PDF

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By Ying Bai

The recognition of serial communications calls for that extra serial port interfaces be constructed to fulfill the increasing standards of clients. The home windows Serial Port Programming guide illustrates the foundations and techniques of constructing numerous serial port interfaces utilizing a number of languages. This entire, hands-on, and useful advisor to serial interface programming allows you to increase subtle interfaces and follow them in real-world purposes. each one bankruptcy addresses a language and the way it may be utilized within the improvement of serial port interfaces. The seven languages mentioned are:

  • ANSI C
  • Visual C++
  • Visual uncomplicated
  • LabVIEW
  • Smalltalk
  • Java step-by-step and line through line, the instruction manual essentially explains the interfacing strategies used for every diversified language within the serial port verbal exchange. Examples from real platforms were compiled and debugged, with special resource code for every incorporated on an accompanying CD-ROM.
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    Example text

    Although many PCs only have a 16550 chip with a 16-byte buffer, better UARTS have even larger buffers. The interrupt is issued slightly before the buffer gets full (at a trigger level of 14 bytes for a 16-byte buffer). This allows room for a couple more bytes to be received before the interrupt service routine is able to actually fetch all these bytes. The trigger level may be set to various permitted values by kernel software. A trigger level setting of 1 will be almost like an obsolete UART (except that it still has room for 15 more bytes after it issues the interrupt).

    6 also shows that any voltage from Ϫ3 to Ϫ25 volts with respect to signal ground is considered a logical 1 (the Mark state), whereas a voltage from ϩ3 to ϩ25 volts is considered a logical 0 (the Space state). The range of voltages between Ϫ3 and ϩ3 volts is considered a transition region for which signal states are not assigned. The Fundamentals of Serial Port Communications 15 Most contemporary applications will show an open-circuit signal voltage of Ϫ8 to Ϫ14 volts for logical 1 (Mark), and ϩ8 to ϩ14 volts for logical 0 (Space).

    This value of 1 is used to indicate that the transmitter buffer will be empty after the next shift, or clock cycle. If the buffer is already empty, the next clock cycle will set the Transmitter Empty flag (TXE) to report to the serialization status register and stop further shifting. The TD line continues to assert the level of the final stop bit, and the line idles at the Mark level until the next byte is loaded into the transmitter holding register to begin a new transmission process. Two statuses are important in programming the transmitter; one is the status of the transmitter holding register, and the other is the status of the transmitter shift register.

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