Method and device for realizing accessing multiple I2C slave device by programmable device

Abstract

The invention discloses a method and a relevant facility to fulfill access on a plurality of I2C slave components with programmable components; wherein, the method comprises the following steps: (1) Select an I2C slave component to be accessed in a plurality of I2C slave components, and write circuit selection information for accessing the I2C slave component into a register group inside the programmable component; meanwhile, connect an I2C controller inside the programmable component with the I2C slave component in a corresponding circuit according to the information; (2) Write the data information, which is needed in accessing the I2C slave component, into the register group in the programmable component, and send a command to start access operation on the I2C slave component; (3) Follow the time sequence in I2C bus specifications to execute access operation on the I2C slave component according to the data information inside the register group. When a CPU accesses a plurality of I2C slave components, the method provided in the invention has advantages of simple and flexible operation, stable and reliable running, high efficiency, high speed and low single-board development cost.

Description

technical field [0001] The invention relates to a method for realizing reading and writing operations on a plurality of I2C slave devices by using a programmable device in the communication field, and also relates to a device for realizing access to a plurality of I2C slave devices by using an existing programmable device. Background technique [0002] The I2C bus interface has the characteristics of less signal lines and easy operation. In the field of communication equipment, the I2C bus interface has been more and more widely used. In standard applications, each I2C device has a unique device address, and the I2C controller implements read and write operations on slave devices connected to the I2C bus by distinguishing device addresses. However, in practical applications, it is necessary to access multiple I2C devices with the same device address. For example, the device addresses of small-package optical modules are all "A0H" or "A2H" solidified in E2PROM. [0003] To s...

AI Technical Summary

Problems solved by technology

Both of these methods implement routing by controlling one line of the I2C bus, and the other line is connected to all I2C slave devices. If an I2C slave device connected to the I2C bus is damaged, this line will appear. The situation of being pulled low all the time makes other devices unable to use the I2C bus, so the selection methods of these two I2C slave devices are risky

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