Arbitration method and system of I2C (Inter-Integrated Circuit) bus

Abstract

The invention provides an arbitration method and system of an I2C (Inter-Integrated Circuit) bus. According to both the method and system, control right of the I2C bus is allocated to a current main control device when the I2C bus is currently idle, and overall allocation on the bus control right of the above-mentioned current main control device is realized on the basis of received values, whichare of corresponding flag bits and currently fed back by a status register, when the I2C bus is not currently idle; and I2C bus communication status of each currently authorized main control device iscollected in real time, each time I2C bus communication ending of a corresponding currently-authorized main control device is determined, I2C bus control right of the corresponding currently-authorized main control device is taken back, and the above-mentioned status register is controlled to release the BUSY flag bit thereof, and the currently authorized main control device is a main control device with the currently allocated I2C bus control right. According to the method and system, free switching of the I2C bus control right under status of multiple main control devices can be realized, and a communication rate, communication stability and communication quality of the I2C bus are improved.

Description

technical field [0001] The invention relates to the field of bus communication, in particular to an arbitration method and system for an I2C bus. Background technique [0002] The I2C (Inter-Integrated Circuit) bus is a two-wire (serial data (SDA) line and serial clock (SCL) line) serial bus developed by PHILIPS, through the serial data (SDA) line and the serial The clock (SCL) line transmits information between devices connected to the bus. It is a special form of synchronous communication. It has the advantages of less interface lines, simple control methods, small device packaging, and high communication speed. It has become a microelectronic communication control. A bus standard widely used in the field. [0003] The Chinese patent application with the application publication number "CN106155971A" discloses an arbitration method for the I2C bus. The method includes: after receiving the internal integrated circuit I2C bus control request sent by the first master device, ...

AI Technical Summary

Problems solved by technology

This makes the bus resources always in the occupied state of "either A or B", resulting in a great waste of bus resources

[0005] In addition, when a master control device occupies the control right of the bus for a long time, once an abnormality occurs on the bus, such as a short circuit with the ground, the above-mentioned public scheme cannot make an immediate judgment, and it will be considered that the normal level under the control of the bus is pulled down , resulting in affecting the stability of the bus

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