SPI image generation device based on 8080 interface and control method

Abstract

The invention discloses an SPI (Serial Peripheral Interface) image generating device based on an 8080 interface. The device comprises an 8080 module, a serial-parallel conversion module and an SPI screen, the 8080 module is used for performing command data transmission with the SPI screen through the serial-to-parallel conversion module and sending pixel data information to the SPI screen through the serial-to-parallel conversion module; the serial-to-parallel conversion module is used for sending command data information sent from the 8080 module to the SPI screen through serial-to-parallel conversion by utilizing a first frequency division proportion, sending data information read from the SPI screen to the 8080 module through serial-to-parallel conversion, and sending pixel data information sent from the 8080 module to the SPI screen through serial-to-parallel conversion by utilizing a second frequency division proportion; the invention further discloses an SPI image generation control method. By adding small circuit design and programmable control, image transmission from the 8080 module interface to the SPI screen is achieved, meanwhile, a complex encoding mode of the SPI interface is supported, the transmission rate of the interface is guaranteed, and the area of a chip and hardware resources are saved to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of smart wearable devices, in particular to an SPI image generating device and a control method based on an 8080 interface. Background technique [0002] With the development and popularization of smart devices such as wearable devices and scanning pens, low-resolution screens are widely used. In the previous solution applications, in order to meet the requirements of low power consumption, the screens used in smart small devices basically use 8080 screens. However, as solution providers put forward higher requirements for product cost, Serial Peripheral Interface , SPI) screen is favored by more and more solution providers because of its small number of interfaces and low cost. [0003] In the current solution application, the SPI screen mainly has the following two solutions: First, it is driven by ordinary GPIO, and the CPU is completely used to realize the reading and writing of the interface and the tr...

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Problems solved by technology

[0003] In the current program application, the SPI screen mainly has the following two solutions: 1. It is driven by ordinary GPIO, and the CPU is completely used to realize the reading and writing of the interface and the sending of pixel data. Most of the existing smart wearables use this scheme, but this technical scheme will not only occupy a large amount of CPU bandwidth and time and consume a large amount of power consumption when transmitting pixels, but also the transmission rate of pixel data cannot meet the refresh rate of the screen; In the Chinese patent application titled "Devices and Graphic Signal Generators for Generating SPI Interface Graphic Signals", the adopted scheme is to separately add a corresponding SPI controller inside the chip display module to realize the SPI interface image transmission function, Although this solution can increase the transmission rate of the interface, for the chip, it increases the chip area and hardware cost, which has great limitations in the application of the solution.

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