First of all, I: (as an example of the simplest 8x8, then say later)
8x8 o'clock
Personally feel that there is a place to pay attention to:
The first thing is the way to drive the dot matrix
I think the 8x8 dot matrix driver is divided into line scanning and column scanning.
For example, the row scan is a layer of Forcy:
First select the first line, then send the data of this line, then select the second line, then send it into the second line of data, so get loop until it is displayed (ie 8 lines), remember to blanking and micro Delay (after the mirroring and slightly faintness), the column scanning. Figure is a code example:
8x8 dot matrix, no scrolling effect
The second is the implementation of the scroll effect.
The idea is:
One: The scan function is constant, each scan a screen, all data moves one; (simple code implementation)
Second: The data is unchanged, and one bit is moved each time the starting position of the data is read. (The code implementation is a bit difficult, anyway, I will not be ╮ (╯ ▽ ╰) ╭)
Take the first as an example:
Code implementation: The basis for implementing the scrolling effect is a scan function and a data processing function. The scan function has two FOR cycles: the first layer FOR loop control image each time the time interval, then the second layer FOR loop displays the entire screen .
As diagram scan function:
Scan function
The focus of scrolling is the writing of the data cycle function, I think the data processing is divided into two types: (only personal ignorance, novice)
The first:
If the content displayed is enough to display (this is generally not yet), then it is not necessary to write data processing functions, directly using the _cror _(*, *) function inside in Intrins.h, or _crol _(*, *) function. It is possible to loop processing on the data. No. 1881.< And >> Whether the left and right movements of the following cannot loops, the data will be lost.
Second:
Naturally, the data displayed is displayed on a screen, causing scroll displaying.
At this point, you must write a data processing function. The principle is simple, such as StreamData [80] stored in this array, then you can move one of the data in the data (or afterward). Finally, the position of StreamData [0] is moved to StreamData [79].
Note: The above scan is still scanning a screen (of course, only one screen can only be scanned), every time the screen is scanned, then the data is processed.
As shown in the figure, the second data processing function:
Note: But I have trouble this method, but I have never thought of other better ways, so if the reader has a better way, I hope I can share it.
For the display of the LED light, I don't say the principle of LED, I don't say, everyone understands, I said a few small details: (make up the pit digging above)
1, slightly.
When the dynamic digital tube is operated, each digital tube is bright, and it is necessary to improve the brightness before spotting a digital tube, which can improve the brightness, the overall effect of the time is too long, will be greatly reduced (commonly known as: shaking ), But without delay, the brightness will be very low, so how long does it take to delay in the process, but in fact, it depends on your eyes.
(If you don't sway your eyes are good delay!)
2, blanking. (It is to eliminate vague light, that is, ghost)
The blanking is to say that all the lights will be detached before all the data is refreshed next time. Otherwise, it will appear. I remember that I have just gotten it when I have just learned, and then change the time (it won't know, I don't know how to fight this), how to change it, until I finally retrieve the original video, routines I saw it once I know to blanking.
Here is what I just did when I started to learn a microcontroller:
My own heart-shaped light, I updated my hand, more food, everyone don't laugh.
(When you do that light, you just started learning, the electrical resistance is small, causing too bright, the eyes are so blind ....)
16x16 o'clock generally drove with 74HC595, so there should be other knowledge, so you will not say it here, then say it next time. Bye ~ ☂, read full text, original title: 51 single-chip - LeD class programming skills
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