Method of realizing telecommunication of common three-line IO (Input/Output) with multiple CPUs (Central Processing Unit)

Abstract

The invention provides a method of realizing telecommunication of a common three-wire IO (Input / Output) with multiple CPUs, and relates to the field of multi-CPU telecommunication connection. The method comprises the following steps: firstly, a handshake signal line MCLK (Master CLocK) is occupied by a first CPU, the MCLK is set to zero, and a telecommunication application is sent to a second CPU; secondly, a handshake signal line SCLK ( Serial Clock ) is occupied by a second CPU, the MCLK is detected to be equal to 0, the telecommunication application of the first CPU is received, and the SCLK is set to 0; thirdly, the SCLK is detected to be equal to 0 by the first CPU, data bit 0 is sent to a data line SDA, and the MCLK is set to 1; fourthly, the MCLK is detected to be equal to 1 by the second CPU, the data bit 0 is received by the data line SDA, and the SCLK is set to 1; fifthly, the SCLK is detected to be equal to 1, data bit 1 is sent to the data line SDA, and the MCLK is set to 0; and lastly, the MCLK is detected to be equal to 0 by the second CPU, the data bit 1 is received by the data line SDA, and the SCLK is set to 0. The method has the advantages that data delay is not required; interrupt is not required either; peer-to-peer transmission can be realized; the method is provided with a sending / receiving check waiting mechanism; telecommunication speed is increased at the utmost; absolute synchronization can be ensured; speed of CPUs of two persons is arbitrary; and interactive interfaces can be expanded through a certain protocol, so that expansion is convenient, and cost is saved.

Description

technical field [0001] The invention relates to the field of multi-CPU communication connection, in particular to a method for multi-CPU common 3-line IO to realize communication. Background technique [0002] In the process of manufacturing inverter power supply equipment, a single CPU cannot meet the requirements, and there will be more than two CPUs to complete all functions together. Multiple CPUs want to achieve synchronous work, and a good communication method is needed to solve the problem of synchronization. The problem is that multiple CPUs exchange data through 10 communications. How to achieve fast speed and reliable communications and occupy less resources is an urgent problem to be solved at this stage. [0003] In our commonly used main chip devices, hardware interfaces such as serial ports, I2C, and SPI are mainly used to interact with the outside world. No matter which interface is used, a dedicated hardware interface is required, and the hardware interface i...

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Problems solved by technology

[0002] In the process of manufacturing inverter power supply equipment, a single CPU cannot meet the requirements, and there will be more than two CPUs to complete all functions together. Multiple CPUs want to achieve synchronous work, and a good communication method is needed to solve the problem of synchronization. The problem is that multiple CPUs exchange data through 10 communication, how to achieve fast speed and reliable communication and occupy less resources, this is an urgent problem to be solved at this stage

[0003] In our commonly used main chip devices, hardware interfaces such as serial ports, I2C, and SPI are mainly used to interact with the outside world. No matter which interface is used, a dedicated hardware interface is required, and the hardware interface is limited by the cost of the chip. , in the low-end 8-bit single-chip microcomputer chip, there is usually only one hardware serial port. In this case, the traditional method cannot meet the multi-channel external interaction interface.

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