CN102790657A

CN102790657A - Simplex asynchronous serial communication encoding and decoding method

Info

Publication number: CN102790657A
Application number: CN2012102266208A
Authority: CN
Inventors: 罗小华
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-29
Filing date: 2012-06-29
Publication date: 2012-11-21

Abstract

The invention discloses a simplex asynchronous serial communication encoding and decoding method, by which simplex serial communication encoding and decoding are completed based on a single signal wire. The method comprises the following steps: counting a continuous low level during the decoding of a decoding module; determining that the current continuous low level count value is a continuous low level count value corresponding to logic 1 and the previous continuous low level count value is a continuous low level count value corresponding to logic 0 if the product of the current continuous low level count value of a signal wire and 1.015625 is less than the previous continuous low level count value; or, determining that the previous continuous low level count value is the continuous low level count value corresponding to logic 1 and the current continuous low level count value is the continuous low level count value corresponding to logic 0 if the product of the previous continuous low level count value and 1.015625 is less than the current continuous low level count value; and otherwise, continuing the comparison to determine the continuous low level count value corresponding to logic 0 and the continuous low level count value corresponding to logic 1. By adopting the method, the encoding and decoding are low in cost and easy to implement.

Description

A kind of single worker's asynchronous serial communication decoding method

Technical field

The present invention relates to communication field, especially a kind of single worker's asynchronous serial communication decoding method.

Background technology

The communication modes of electronic circuit can be divided into parallel communication and serial communication, and the advantage of parallel communication is that communication speed is fast, but that shortcoming is a holding wire is more; The advantage of serial communication is that holding wire is few, realizes long-distance transmissions easily.

Generally in the low and middle-end electronic product, communication interface only needs the one-way data transmission, and is not high to the transfer of data rate request, but needs interface simple as far as possible, so need simple, the easy realization of agreement, the less serial communication decoding method of Seize ACK message line.

Present I ²Serial communications such as C, SPI, RS-232 obtain extensive use because of advantages such as pin are few.I ²C, RS-232 communication coding more complicated realize that cost is higher; Spi bus is made up of three signal line, comprises serial clock (SCLK), serial data output (SD0), serial data input (SDI), and iic bus needs two lines (SCL, SDA) to form.

Summary of the invention

Defectives such as, realization cost higher for the encoding and decoding cost that overcomes the existing means of communication is higher, the present invention provides a kind of encoding and decoding cost low, easy realization, only needs a holding wire just can accomplish the decoding method of single-signal-line list worker asynchronous serial communication.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of single worker's asynchronous serial communication decoding method, said method adopts and accomplishes the encoding and decoding of single worker's asynchronous serial communication based on single holding wire, and is specific as follows:

1. definition time T ₀And time T ₁, T ₀Greater than 1.015625 * T ₁

2. logical zero is by less than time 1.0078125 * T ₀And greater than time T ₀The indication of continuous low level, logical one is by less than time T ₁And greater than time 0.9921875 * T ₁The indication of continuous low level;

3. signal indicates one digit number according to end-of-encode by low level to the rising edge of high level;

4. the default setting of definition signal line is a high level, and the index signal line is in idle state;

Count continuous low level, current continuous low level count value Count on the holding wire during decoder module decoding _CurrTake advantage of 1.015625 value less than last position low level count value Count continuously _Prev, then confirm current continuous low level count value Count _CurrBe the corresponding continuous low level count value Count of logical one ₁, last position is low level count value Count continuously _PrevBe the corresponding continuous low level count value Count of logical zero ₀Or current continuous low level count value Count _CurrGreater than the continuous low level count value Count in last position _PrevTake advantage of 1.015625 value, then confirm last position low level count value Count continuously _PrevBe the corresponding continuous low level count value Count of logical one ₁, current continuous low level count value Count _CurrBe the corresponding continuous low level count value Count of logical zero ₀Otherwise continue relatively continuous low level count value Count to confirm that logical zero is corresponding ₀The continuous low level count value Count corresponding with logical one ₁

Further, during decoding, the continuous low level count value Count on the holding wire is greater than Count ₁Take advantage of 1.015625, confirm that then correspondence is encoded to logical zero, otherwise be logical one; Or the continuous low level count value Count on the holding wire takes advantage of 1.015625 less than Count ₀Confirm that then correspondence is encoded to logical one, otherwise be logical zero.

Beneficial effect of the present invention mainly shows: 1. coding can realize that the coding module circuit is simple through program control; 2. decoding only needs counting, displacement, plus-minus, comparison operation, and decoder module is simple.

Embodiment

Further describe in the face of the present invention down.

A kind of single worker's asynchronous serial communication decoding method is accomplished the encoding and decoding of single worker's asynchronous serial communication based on single holding wire, and is specific as follows:

1. definition time T ₀And time T ₁, T ₀Greater than 1.015625 * T ₁

2. logical zero is by less than time 1.0078125 * T ₀And greater than time T ₀The indication of continuous low level, logical one is by less than time T ₁And greater than time 0.9921875 * T ₁The continuous low level indication of time;

During the decoder module decoding, the continuous low level count value Count on the holding wire is greater than Count ₁Take advantage of 1.015625, confirm that then correspondence is encoded to logical zero, otherwise be logical one; Or the continuous low level count value Count on the holding wire takes advantage of 1.015625 less than Count ₀Confirm that then correspondence is encoded to logical one, otherwise be logical zero.

Claims

1. single worker's asynchronous serial communication decoding method, it is characterized in that: said method can be accomplished the encoding and decoding of single worker's asynchronous serial communication based on single holding wire, and is specific as follows:

1. definition time T ₀And time T ₁, T ₀Greater than 1.015625 * T ₁

2. single worker's asynchronous serial communication decoding method as claimed in claim 1 is characterized in that: during decoding, the continuous low level count value Count on the holding wire is greater than Count ₁Take advantage of 1.015625, confirm that then correspondence is encoded to logical zero, otherwise be logical one; Or the continuous low level count value Count on the holding wire takes advantage of 1.015625 less than Count ₀Confirm that then correspondence is encoded to logical one, otherwise be logical zero.