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Direct memory access (DMA)-based general purpose input output (GPIO) module capable of refreshing light-emitting diode (LED) display screen

A technology of LED display screen and CPU module, applied in static indicators, instruments, electrical digital data processing, etc., can solve the problems of high production cost and complex implementation, and achieve the effect of large swiping bandwidth

Inactive Publication Date: 2013-01-30
东莞润风电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the production cost will be relatively high, and it will be more complicated to implement.

Method used

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  • Direct memory access (DMA)-based general purpose input output (GPIO) module capable of refreshing light-emitting diode (LED) display screen
  • Direct memory access (DMA)-based general purpose input output (GPIO) module capable of refreshing light-emitting diode (LED) display screen
  • Direct memory access (DMA)-based general purpose input output (GPIO) module capable of refreshing light-emitting diode (LED) display screen

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Embodiment Construction

[0035] The present invention will be specifically described through embodiments below in conjunction with the accompanying drawings.

[0036] like figure 1 As shown, the present invention is composed of control register module 1, FIFO module 2, LED_ABCD control module 3, LED_OEN control module 4, LED_STB control module 5, LED_CLKS control module 6, data output control module 7 and IObank selection module 8.

[0037] Each part is described in detail below:

[0038] The control register module 1 is connected with the CPU module 10, the LED_ABCD control module 3, the LED_OEN control module 4, the LED_STB control module 5, the LED_CLKS control module 6, the data output control module 7 and the IObank selection module 8, and is used for receiving and storing the CPU module 10 The command issued, and then according to the relevant command to control the operation mode of other modules connected to it.

[0039] The FIFO module 2 is connected with the DMA module 11 and the data outp...

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Abstract

The invention provides a direct memory access (DMA)-based general purpose input output (GPIO) module capable of refreshing a light-emitting diode (LED) display screen. The DMA-based GPIO module comprises a control register module, a first input first output (FIFO) module, an LED-ABCD control module, an LED-OEN control module, an LED-STB control module, an LED-CLKS control module, a data output control module and an IObank selection module. A rapid transmission channel from the memory to an IO pin is provided for data, wide bandwidth conditions are provided for the LED display screen to a certain degree. The LED-CLKS control module provides a clock which is synchronous with data and a plurality of clocks which have the common frequency and are out-of-phase, and the clocks which have the common frequency and are out-of-phase provide conditions for expanding the height of the LED display screen. All control signals of the LED display screen are automatically generated by hardware, and complexity of the late development is greatly simplified. The characteristics are combined, so that the product is few in peripheral circuits, simple in design and high in screen refreshing capacity.

Description

technical field [0001] The invention relates to a screen refresh technology for LED display screens, in particular to a screen refresh technology suitable for high-bandwidth and large-size LED display screens. Background technique [0002] With the rapid development of LED display technology, the color of the display screen has been popularized from single and double colors to full color, and the display content has been converted from text and pictures to real-time video display, which puts forward higher requirements for the refresh ability of LED display screens. In the control card of the traditional LED display screen, it is often necessary to add an FPGA to perform screen swiping operations with a large amount of data. In this way, the production cost will be relatively high, and the implementation will be relatively complicated. Contents of the invention [0003] The purpose of the present invention is to provide a DMA-based GPIO module capable of flashing LED disp...

Claims

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Application Information

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IPC IPC(8): G06F13/28G09G3/32
Inventor 孙进军周毅奚谷枫
Owner 东莞润风电子科技有限公司
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