Communicated method, communication system and communication routing device based on SPI bus

Abstract

The invention discloses a communication method based on an SPI bus, comprising the following steps: providing selection signals of slave equipment through a data line of main equipment; determining the selected slave equipment according to the selection signals; carrying out accessing operation on the selected slave equipment through the main equipment; providing selection signals of a controlled electric unit through the data line of the main equipment; selecting the controlled electric unit according to the selection signals, and generating an open / close control command of the controlled electric unit; sending the control command to the controlled electric unit to control actions of the controlled electric unit. The invention also discloses a communication system based the on the SPI bus and a communication routing device used for the communication system. SPI main equipment provides the selection signals through the data line, and determines a selected operation object according to treatment of the signals, therefore, the accessing operation of the main equipment on the slave equipment can be realized only needing the SPI bus of 3 line or 4 line and without arranging more pins on a host end to descend any other control signals.

Description

【Technical field】 [0001] The present invention relates to SPI (serial peripheral interface, serial peripheral interface) bus control, in particular to a communication method and communication system based on the SPI bus. 【Background technique】 [0002] The SPI bus system is a synchronous serial peripheral interface, which is a commonly used industrial standard bus, through which the host computer and various peripheral devices can exchange information in a serial manner. For example, ultrasonic diagnostic systems in the medical field are generally equipped with multiple probes. In order to identify the probes, each probe can be equipped with a non-volatile memory or logic device for storing information such as the ID code of the probe. These storage devices are used as slave devices. The host computer of the ultrasonic diagnostic system can be accessed through the SPI bus to obtain the ID code, and the control of the host computer on the power supply and relays on the system...

AI Technical Summary

Problems solved by technology

[0004] Among the above schemes, the disadvantages of scheme 1 and scheme 2 are obvious. Since there are many communication pins between the host and multiple probes, a large amount of pin resources on the host side of the system are occupied. If you add probes during the upgrade, you need to add more pins. lead to the revision of the printed circuit board of the host

Although Scheme 3 and Scheme 4 greatly save the number of pins on the host side compared with Scheme 1 and Scheme 2, they need to increase the CS signal at least when the probe is expanded, so the number of pins required is still large. In terms of compatibility and Scalability still has drawbacks

Images