Implementing a common anode digital tube in C language-EEWORLD

Collect

#include

void main()

{

P1=0xB0;

while(1);

}

Well, that's all the codes. The actual circuit may have 74H or something. But it's just one bit, mainly to record my confusion about why it is B0 instead of 0B.

Assume that the digital tube is a common anode digital tube and the number "3" is to be displayed.

The principle of digital tube is as shown in the figure:

In alphabetical order: a b c d e f g dp

Corresponding level high and low 0 0 0 0 1 1 0 1

But when I used the digital tube assistant, it was 1 0 1 1 0 0 0 0. I thought I had misjudged the electrical level, after all, I had no basic knowledge at all and had to start from scratch.

Later I found out that data is represented starting from the high bit.

And a b c d e f g dp are connected to P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 pins respectively. Starting from the high position, it should be

1 0 1 1 0 0 0 0 instead of 0 0 0 0 1 1 0 1. This is exactly the same as the result obtained by the digital tube assistant.

Reference address：Implementing a common anode digital tube in C language

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