hybrid control method and device based on software simulation I2C and hardware I2C

Abstract

The invention discloses a hybrid control method for simulating I2C and hardware I2C based on software. The method comprises the following steps: 1) an I2C master controller arranged on an ARM CPU chipobtains attribute information and register address information of a display module through an upper computer; 2) software I2C signal driving software is loaded by the I2C master controller, outputting a simulation I2C signal to I2C slave equipment, and read a time sequence signal by the simulation I2C signal; And 3) the I2C master controller unloads the software I2C signal driving software, loadsthe hardware I2C signal driving software, and outputs a standard I2C signal to the I2C slave device, and the standard I2C signal is a standard I2C write time sequence signal. According to the invention, when the hardware I2C signal is used for reading operation; Compared with software simulation I2C signals, the method has the advantages that only standard repstart waveforms can be output, the output requirements of non-standard time sequence waveforms cannot be met, and meanwhile, compared with software simulation I2C signals, the abnormal conditions that clock signals are unstable and the like due to the fact that i2c signals are interfered by CPU preemption are avoided.

Description

technical field [0001] The invention relates to the technical field of display module driving, in particular to a hybrid control method and device based on software simulation I2C and hardware I2C. Background technique [0002] There are TCON IC chips on new display modules such as liquid crystal modules. TCON is mainly responsible for outputting the signals required by the driver IC on the liquid crystal module, and requires the I2C master controller to configure the Gamma register for it. [0003] At present, mainstream ARM CPU chips have I2C controllers. In the master mode, slave devices are controlled through the I2C bus, and the standard I2C bus protocol is also supported. The standard mode of the I2C bus protocol is 100Kbit / s, and the fast mode is 400Kbit / s, which can support I2C read, write, repstart read, 7-byte device address, 10-byte device address and other functions. [0004] For standard I2C protocol chips, hardware I2C signals are usually used to transmit read...

AI Technical Summary

Problems solved by technology

The advantage of hardware I2C is that the signal output is stable, the clock rate is standard, and it is not interfered by the core preemption signal, etc. The disadvantage is that the timing requirements are standardized, cannot be customized, and is not flexible enough

[0005] At present, there are chips with non-standard I2C protocol on the market. Since the hardware I2C signal cannot modulate non-standard timing signals, the I2C signal can only be simulated by software.

Advantages of software simulation I2C The signal can be customized, and special requirements can be added in the timing sequence, but the disadvantage is that the signal output is unstable, easy to be interfered, and the clock rate is limited, which cannot meet the actual application requirements.

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