JPH0561439A - Led dynamic lighting system - Google Patents

Abstract

PURPOSE:To reduce burden on the of a CPU after the addition of hardware is reduced to a minimum in a method to control a LED matrix by a microcomputer. CONSTITUTION:Dynamic lighting can be realized by setting data to be set on a row address latch circuit 106 and a column data latch circuit 107 which control the LED matrix 105 on LED control information memory 102, and transferring it from a DMA control circuit 101 with the timing generated by a DMA timing generation circuit 104. At this time, the lighting time of a LED can be secured by transferring a row address and column data for one row in a short time, and keeping time interval between the rows by the DMA timing generation circuit 104.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an L which dynamically lights a large number of LEDs under the control of a microcomputer.
The present invention relates to an ED dynamic lighting system.

[0002]

2. Description of the Related Art Conventionally, in this type of LED dynamic lighting system, a microcomputer updates a row address and column data at regular time intervals to control an LED matrix, or a dedicated hardware for LED dynamic lighting is provided. Was used to control the LED matrix.

[0003]

However, of the conventional methods, the former method in which the microcomputer writes row address and column data at regular intervals has a drawback that the processing time of the microcomputer becomes long. .. On the other hand, the latter method using dedicated hardware has a drawback that the price and the mounting space increase.

The present invention has been made in view of the above problems, and provides an LED dynamic lighting system capable of shortening the processing time of a microcomputer without using dedicated hardware. To aim.

[0005]

In order to achieve the above object, the LED dynamic lighting system of the present invention uses a large number of LEDs.
An LED matrix composed of EDs, a latch circuit for outputting a row address for dynamically lighting the LEDs, a plurality of latch circuits for holding column data, and an LED control for storing dynamic lighting information controlled by a microcomputer A DMA control circuit for transferring information of the LED control memory to a memory, a latch circuit for row address and column data controlled by a microcomputer, and a predetermined interval corresponding to a lighting time of the LED of the DMA control circuit are provided. And a DMA timing generation circuit for generating transfer timing.

[0006]

According to the LED dynamic lighting system having the above structure, the DMA control circuit controls the row address and column data latch circuits by the microcomputer according to the timing generated by the DMA timing generation circuit, and the LED control memory controlled by the microcomputer. The dynamic lighting information stored above is transferred, which allows LE
The D matrix is controlled and the LEDs are turned on.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an LED dynamic lighting system according to an embodiment of the present invention.

In the figure, 100 is a CPU, and DM
It controls the A control circuit 101 and the LED control memory 102. LED control information is set in the LED control memory 102, and the control information is periodically and repeatedly transferred to the LED control board 103 by the DMA control circuit 101. The DMA timing is generated by the DMA timing generation circuit 104. This transfer timing has a predetermined interval corresponding to the lighting time of the LED.
Reference numeral 105 is an LED matrix including a large number of LEDs.

The row address latch 106 and the column data latch 107 of the LED matrix 105 are connected to the LED control port 103, and which latch is selected is determined by the higher order of the transfer information. Here, it is assumed that the row address latch 106 is selected when the higher order is 1111 and the column data latch is selected when the higher order is 0000, 0001, and 0010, and the lower order of the transfer information is set to the latch. Here, in the LED matrix 105, the LEDs in which the row address latch 106 is 0 and the column data latch 107 is 1
108 is illuminated.

FIG. 2 is a format diagram of control information set on the LED control memory 102. Here, the row block 200 is control information for one row and has the same number as the number of rows. In each row block 200,
The data designated by the row address latch 106 is fixedly set in the upper part of the first 1 byte, and the data set in the row address latch 106 is fixedly set in the lower part thereof, whereby the row to be controlled by the row block 200 is determined. The second and subsequent bytes are the data of each column data latch 107, and the column data latch 107 is designated by the higher order and the data set in the column data latch 107 is set by the lower order. Here, when 1 is set, the corresponding LED
Is lit, and it goes out when 0.

Therefore, according to this embodiment, the DMA
In accordance with the timing generated by the timing generation circuit 104, the DMA control circuit 101 supplies the row address and column data latch circuits 106 and 107 with the dynamic lighting information stored in the LED control memory 102 controlled by the microcomputer 100. Transferred, which controls the LED matrix 105 and illuminates the LEDs.

FIG. 3 shows the DMA timing generation circuit 1 of FIG.
It is the DMA execution timing generated in 04. As shown here, the data included in one row block 200 is transmitted during the row block transfer time 300, and the time interval 301 is set to be long between the row block transfer time 300 and the row block transfer time 300. This time interval 301 is the row lighting period set in the immediately preceding row block transfer time 300.

[0013]

As described above, according to the LED dynamic lighting system of the present invention, the LED matrix is controlled by the DMA to perform the dynamic lighting, so that the processing time of the microcomputer is short and the dedicated hardware is used. Since it is not necessary, it has an effect that it is inexpensive and requires a small mounting space.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an LED dynamic lighting system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a format of an LED control memory.

FIG. 3 is an execution timing diagram of DMA.

[Explanation of symbols]

 100 CPU 101 DMA Control Circuit 102 LED Control Memory 103 LED Control Port 104 DMA Timing Generation Circuit 105 LED Matrix 106 Row Address Latch 107 Column Data Latch 200 Row Block 300 Row Block Transfer Time 301 Time Interval

Claims (1)

[Claims] 1. An LED matrix composed of a large number of LEDs, a latch circuit for outputting a row address for dynamically lighting the LEDs, a plurality of latch circuits for holding column data, and a dynamic lighting controlled by a microcomputer. An LED control memory for storing information of the LED control memory, a DMA control circuit for transferring the information of the LED control memory to a row address and column data latch circuit controlled by a microcomputer, and the DMA control circuit.
An LED dynamic lighting system comprising: a DMA timing generation circuit that generates a transfer timing having a predetermined interval corresponding to the lighting time of the LED of the control circuit.