Turn on the LED

Preface

As the saying goes ： A good beginning is half the battle ！ I quite agree with this sentence , This is the simplest basic program , But if you want to complete this program, you need to understand the programming process , What information do you need to see 、 The framework of the program, etc . That solved the problem , The later programming path can be too smooth . I also checked a lot of information to solve , Just leave some experience for the later scholars .

The information of these circuits and chips can be found on XXX learning website

Programming flow
1. First of all, we must look at the chip pin name , And analyze LED Circuit .

Take a look at the distribution and name of the pins , It will be used later .

Here is LED And the circuit diagram of the nixie tube , Let's not look at the digital tube here , Only study light-emitting diodes ：

You can see 8 Diode Common Cathode , If you want to light them , Cathode should provide low level .P2.3 Pass a Inverter （ Exchange high and low levels Connected to the cathode of the diode , So one condition for lighting up is P2.3 Provide high level at .
P0 Of 0 To 7 Which one is 1 The corresponding diode controlled will light up .

After analyzing the circuit, you can write a program . First put the code below and then analyze it step by step .

#include <STC15F2K60S2.H>
sbit led_sel=P2^3;
void Init(){
    
	P0M0=0xff;
	P0M1=0x00;
	
	P2M0=0x08;
	P2M1=0x00;
	
	led_sel=1;
}

void main(){
    
	Init();
	while(1){
    
	P0=0xf0; 
	}

}

This procedure is to make the high four bits of the diode light , The lower four digits are not lit .

Effect after downloading

Let's analyze the code ：
1. First of all, you must include the header file of the chip

2. The following two lines are the control circuit diagram P2.3 High level at
It is stipulated in the chip data that the writing method is fixed as follows , If you change these two lines to sbit P2^3=1; You're going to report a mistake

sbit led_sel=P2^3;
led_sel=1;

3.Init（） The function is initialized P2.3 And set the push-pull output

The material introduces four output settings , Push pull output is strong pull up . Here is either 5v Or 0v For strong pull-up , Therefore, it is set as push-pull output .
Push pull output is written as follows ：

because P2 It's only used. P2.3 So when setting push-pull output P2M0 by 0x08（0000 1111）. and P0,8 All pins are used , When setting push-pull output P0M0 by 0xff（1111 1111）.M1 The end is all 0x00 There is no difference .

4.main The initialization function is called in the function .
Use here while The loop keeps the program refreshed ,P0 Set up LED Light on and off , change P0 The value of can be changed LED The situation of .

Postscript

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