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Single-line half duplex communication method

A communication method and half-duplex technology, applied in the field of CPU communication, can solve the problems of unsuitable use of asynchronous serial ports and high requirements for communication baud rate accuracy.

Inactive Publication Date: 2018-08-21
FOSHAN BAYKEE NEW ENERGY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the asynchronous serial port (SCI) also has a disadvantage: it requires high precision of the communication baud rate.
It is not suitable to use asynchronous serial port (SCI) at this time

Method used

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  • Single-line half duplex communication method
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  • Single-line half duplex communication method

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Experimental program
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Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0018] Such as figure 1 As shown, S1 samples the communication frame according to the standard baud rate sampling interval. It can be seen that each sampling is in the middle of the corresponding data bit, and there is no offset; while S2 is after the baud rate is offset. It can be seen that the corresponding data bits have been shifted from the sixth sample, so the reception is unsuccessful.

[0019] A single-wire half-duplex communication method, comprising a sending end and a receiving end, the sending end is communicated with the receiving end through a single communication line, and the communication method includes the following steps:

[0020] Step 1: the sending end adjusts the duty ratio of the transmission bit; the sending end sets a fixed duty ratio n / m as a 0 signal within a clock cycle...

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PUM

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Abstract

The invention relates to a single-line half duplex communication method, comprising a sending end and a receiving end. The sending end is connected with the receiving end through a single communication line. The communication method comprises the following steps that S1, the sending end adjusts a duty cycle of transmission bits, the sending end sets a fixed duty cycle n / m as 0 signals and sets clock signals of which duty cycle is 1-n / m as 1 signals (the n is smaller than the m) in a clock period, and it is stated that the 0 signals and the 1 signals are started at a low level and are finishedat a high level; and S2, the receiving end reads data bits through the duty cycle of the clock signals, and the receiving end receives a complete transmission frame of a byte from a start bit of the 0signals to an end bit of the 1 signals, thereby finishing communication transmission. According to the method, the clock signals are reset through the fixed duty cycle, and when asynchronous serial communication is carried out and CPU Baud rates are deviated, the communication is guaranteed to be carried out normally.

Description

technical field [0001] The invention relates to the technical field of CPU communication, in particular to a single-line half-duplex communication method. Background technique [0002] The communication between the commonly used CPU and CPU is usually through asynchronous serial port (SCI), synchronous serial port (SPI), parallel port, CAN or Ethernet port for data exchange. There are too many hardware connecting wires for the parallel port, and it is not practical when the CPUs are not on the same PCB and are far apart; the cost of the CAN port and the Ethernet port is too high; relatively speaking, the synchronous serial port (SPI) has more connecting wires, and there is a clock Lines are also not very suitable for long-distance transmission. [0003] Asynchronous serial port (SCI) is relatively commonly used. Through circuit design, half-duplex data communication can also be realized with one line. However, the asynchronous serial port (SCI) also has a disadvantage: it ...

Claims

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Application Information

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IPC IPC(8): H04L5/16
CPCH04L5/16
Inventor 黄敏罗世明
Owner FOSHAN BAYKEE NEW ENERGY TECH INC