LED dot matrix screen, I want to ask you guys, why I only light up one light, but the whole row is lit

朱某mou

LED dot matrix screen, I want to ask you guys, why I only light up one light, but the whole row is lit [Copy link]

 

maychang

It may be caused by hardware error or software error. The possibility of software error is higher.

foxpro2005

99.9% of the time it's your program problem

朱某mou

foxpro2005 posted on 2020-8-22 12:52 99.9% of the time it’s your program problem

freebsder

Crossover IO outputs? The crossover IO is not correct.

huo_hu

What screen? It sounds like ws2812.

朱某mou

huo_hu posted on 2020-8-25 03:35 What screen? It sounds like ws2812

Two 16X64 dot matrix, the chips behind are 74HC245, 74HC138 and 5020

huo_hu

There should be a serial-to-parallel chip.

29447945

Generally speaking, it's a problem with your program. There are many examples of this kind of screen on the Internet. You can modify it yourself and it will light up.

hujj

Could it be a column scan problem?

朱某mou

hujj posted on 2020-9-1 15:32 Could it be a column scan problem?

I don't know what to do. I've given up.

朱某mou

#include"reg51.h"
#include"intrins.h"
//寄存器
sfr AUXR = 0x8E;
sfr P1M0 = 0x92;   
sfr P1M1 = 0x91;
sfr P3M0 = 0xB2;
sfr P3M1 = 0xB1;
//IO口
sbit LA = P1^0;
sbit LB = P1^1;
sbit LC = P1^2;
sbit LD = P1^3;
sbit R1 = P1^4;
sbit R2 = P1^5;
sbit EN = P3^5;
sbit LAT = P3^6;
sbit CLK = P3^7;

unsigned char code zk[]={
0x08,0x00,0x08,0x00,0x0F,0xFC,0x14,0x00,0x24,0x00,0x47,0xF0,0x04,0x00,0x04,0x00,
0x07,0xF8,0x04,0x00,0x01,0x00,0x08,0x84,0x48,0x92,0x48,0x12,0x87,0xF0,0x00,0x00,/*"怎",0*/

0x01,0x00,0x01,0x00,0x02,0x00,0x02,0x00,0x04,0x40,0x08,0x40,0x10,0x80,0x20,0x80,
0x41,0x00,0x02,0x00,0x04,0x20,0x08,0x10,0x10,0x08,0x3F,0xFC,0x10,0x04,0x00,0x00,/*"么",1*/

0x20,0x00,0x27,0xFC,0x24,0x44,0x24,0x44,0xFC,0x44,0x27,0xFC,0x24,0x44,0x2C,0x44,
0x34,0x44,0xE7,0xFC,0x24,0x44,0x24,0x44,0x24,0x44,0x28,0x44,0xA8,0x54,0x50,0x08,/*"拥",2*/

0x02,0x00,0x02,0x00,0xFF,0xFE,0x04,0x00,0x04,0x00,0x0F,0xF0,0x08,0x10,0x18,0x10,
0x2F,0xF0,0x48,0x10,0x88,0x10,0x0F,0xF0,0x08,0x10,0x08,0x10,0x08,0x50,0x08,0x20,/*"有",3*/

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFE,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/*"一",4*/

0x02,0x08,0x21,0x10,0x10,0x00,0x17,0xFC,0x00,0x80,0x03,0xF8,0xF2,0x08,0x13,0xF8,
0x12,0x08,0x13,0xF8,0x12,0x08,0x13,0xF8,0x12,0x08,0x28,0x00,0x47,0xFE,0x00,0x00,/*"道",5*/

0x01,0x00,0x07,0x84,0x78,0x04,0x08,0x88,0x44,0x90,0x25,0x22,0x20,0x02,0x04,0x04,
0x7F,0x88,0x0C,0x10,0x16,0x22,0x15,0x02,0x24,0x84,0x44,0x08,0x84,0x10,0x04,0x60,/*"彩",6*/

0x10,0x00,0x10,0x00,0x11,0xFC,0x7C,0x20,0x54,0x20,0x54,0x20,0x54,0x20,0x54,0x20,
0x7C,0x20,0x50,0x20,0x10,0x20,0x14,0x20,0x1E,0x20,0xE2,0x20,0x43,0xFE,0x00,0x00,/*"虹",7*/
};
//void Delay1ms()		//@11.0592MHz
//{
//	unsigned char i, j;
//
//	_nop_();
//	_nop_();
//	_nop_();
//	i = 11;
//	j = 190;
//	do
//	{
//		while (--j);
//	} while (--i);
//}
void WriteIC(unsigned char DataR1,unsigned char DataR2)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		R1 = DataR1&0x80;
		R2 = DataR2&0x80;
		CLK = 0;
		CLK = 1;
		DataR1 = DataR1 << 1;
		DataR2 = DataR2 << 1;	
	}
}

void Dispaly()
{
	unsigned char i,j;
	for(i=0;i<16;i++)
	{
		EN = 0;
		LAT = 0;

		for(j=0;j<8;j++)
		{
			WriteIC(zk[j*32+i*2],0);
			WriteIC(zk[j*32+i*2+1],0);
		}

		P1 = i;

		LAT = 1;
		EN = 1;		
	}
}

void main()
{
	AUXR |= 0x80;	//1T
	P1M0 = 0xff;	//推挽
	P3M0 = 0xff;
	P1M1 = 0;
	P3M1 = 0;
	while(1)
	{
		Dispaly();			
	}
}

It has been a long time since I came back to look at this problem. Actually, the program was written correctly at that time.

But at that time, I didn’t understand the use of the power and ground on this interface. The microcontroller was only connected to the signal line, and the power and ground were not connected to the microcontroller but were connected separately. Now I still use the code at that time, but just connect the power and ground on the interface to the power and ground of the microcontroller.

朱某mou

朱某mou posted on 2020-10-19 17:09 It's been a long time since I came back to look at this question. Actually, the program was written correctly at that time, but I didn't understand the purpose of the power and ground on this interface at that time, ...

I still don't understand why this happened.