【Z】Arduino也能驱动LED显示屏，LED业界标准Arduino驱动方案解析

现在市面上有很多很多的LED显示屏，但大多都基于同一种，或者同一类型的驱动方式，简称08驱动方式，它内部有LED点阵，74HC595，以及138行扫芯片组成，但毫无例外的，是主控板都采用了STC方案，或者串口方案，而Arduino驱动却鲜有人用，今天，小Z就带了LED业界标准Arduino驱动方案的介绍与解析

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2013-6-29 16:45 上传
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市场上主流的显示屏有F3.75和F3.0两种，F后面代表的点阵屏单体LED的直径，而今天，小Z用的是F2.0的超密集进口点阵，显示效果个人很喜欢，下面是市场上常见的2种屏幕（F3.75 F3.0）和今天所使用的F2.0屏幕（分辨率均为16*64）的对比图，可以很轻松的看出大小的差别。

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随后的重点便是行驱的模式，今天我推荐两种驱动模式，分别是1616驱动模式，和1664直接驱动模式，这两种模式各有特点，1616即是汉字是一个一个取模，一个一个显示，而1664是取模软件直接取出一幅完整的图像。如果是显示汉字的同学，推荐采用第一种，而显示图形的同学，推荐采用第二种。



下面，先把主体的演示代码发一下。

ARDUINO 代码复制打印

#define RowA 2 #define RowB 3#define RowC 4#define RowD 5//业界所采用的ABCD 08驱动模式int hc138en=6; //EN口//使用了硬件SPI，以下脚不能更改#define R1 11    //数据出  MOSI#define CLK 13   //时钟  SCK#define STB 10   //595 刷新显示SS#define DATAIN12 //数据入,读FLASH时有用MISO byte row=0;byte zzz[] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,0x00,0x70,0x00,0xE0,0x01,0xC0,0x00,0x00,0x00,0xE0,0x01,0xC0,0x03,0x80,0x00,0x00,0x01,0xC0,0x03,0x80,0x07,0x00,0x00,0x00,0x03,0x80,0x07,0x00,0x0E,0x00,0x00,0x00,0x07,0x00,0x0E,0x00,0x1C,0x00,0x00,0x00,0x0E,0x00,0x1C,0x00,0x38,0x00,0x00,0x00,0x1C,0x00,0x38,0x00,0x70,0x00,0x00,0x00,0x38,0x00,0x70,0x00,0xE0,0x00,0x00,0x00,0x70,0x00,0xE0,0x01,0xC0,0x00,0x00,0x00,0xE0,0x01,0xC0,0x03,0x80,0x00,0x00,0x00,0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};void spi_transfer(volatile char data){SPDR = data;      // Start the transmissionwhile (!(SPSR & (1<<SPIF))) // Wait the end of the transmission{};//return SPDR;      // return the received byte}void hc138sacn(byte r){//输出行线状态ABCD （A低,D高)  digitalWrite(RowA,(r & 0x01));  digitalWrite(RowB,(r & 0x02));  digitalWrite(RowC,(r & 0x04));  digitalWrite(RowD,(r & 0x08));}void hc595senddata(byte data){// 高位在前反相(1亮0灭) for (byte i=0; i<8;i++) { digitalWrite(CLK,0); if (data & 0x80) {   digitalWrite(R1, 0);  } else {   digitalWrite(R1, 1); } data=data<<1; digitalWrite(CLK,1); }}void setup () {  pinMode(RowA, OUTPUT);  pinMode(RowB, OUTPUT);  pinMode(RowC, OUTPUT);  pinMode(RowD, OUTPUT); //138片选  pinMode(hc138en, OUTPUT); //138 使能  pinMode(R1, OUTPUT);//595 数据  pinMode(CLK, OUTPUT); //595 时钟  pinMode(STB, OUTPUT); //595 使能  pinMode(DATAIN, INPUT); //595 使能 //digitalWrite(hc138d, HIGH);  Serial.begin(19200);  //SPI硬件设置  // SPCR = 01010000  //interrupt disabled,spi enabled,msb 1st,master,clk low when idle,  //sample on leading edge of clk,system clock/4 rate (fastest)  SPCR = (1<<SPE)|(1<<MSTR);  delay(10);}void loop () {if (Serial.available() > 0) {// read the incoming byte:row = Serial.read();// say what you got:Serial.print("I received: ");Serial.println(row, DEC);}for(row=0;row<16;row++){  for (int i=0;i<8;i++){    spi_transfer(~(zzz[i+row8]));   }  digitalWrite(hc138en, 1);//关闭显示  hc138sacn(row);    //换行  digitalWrite(STB, 0);  //595刷新     digitalWrite(STB, 1);  delayMicroseconds(500) ; //节电用,  digitalWrite(hc138en, 0);//开启显示  delayMicroseconds(500) ;//刷新频率调,差不多60HZ,1/16间隔}}
#define RowA 2 


#define RowB 3


#define RowC 4


#define RowD 5


//业界所采用的ABCD 08驱动模式


int hc138en=6; //EN口





//使用了硬件SPI，以下脚不能更改


#define R1 11    //数据出  MOSI


#define CLK 13   //时钟  SCK


#define STB 10   //595 刷新显示SS


#define DATAIN12 //数据入,读FLASH时有用MISO 





byte row=0;


byte zzz[] = 





{


0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,


0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,0x00,0x70,0x00,0xE0,0x01,0xC0,0x00,0x00,


0x00,0xE0,0x01,0xC0,0x03,0x80,0x00,0x00,0x01,0xC0,0x03,0x80,0x07,0x00,0x00,0x00,


0x03,0x80,0x07,0x00,0x0E,0x00,0x00,0x00,0x07,0x00,0x0E,0x00,0x1C,0x00,0x00,0x00,


0x0E,0x00,0x1C,0x00,0x38,0x00,0x00,0x00,0x1C,0x00,0x38,0x00,0x70,0x00,0x00,0x00,


0x38,0x00,0x70,0x00,0xE0,0x00,0x00,0x00,0x70,0x00,0xE0,0x01,0xC0,0x00,0x00,0x00,


0xE0,0x01,0xC0,0x03,0x80,0x00,0x00,0x00,0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,


0xFF,0xF1,0xFF,0xE3,0xFF,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00


};











void spi_transfer(volatile char data)


{


SPDR = data;      // Start the transmission


while (!(SPSR & (1<<SPIF))) // Wait the end of the transmission


{


};


//return SPDR;      // return the received byte


}








void hc138sacn(byte r){//输出行线状态ABCD （A低,D高)


digitalWrite(RowA,(r & 0x01));


digitalWrite(RowB,(r & 0x02));


digitalWrite(RowC,(r & 0x04));


digitalWrite(RowD,(r & 0x08));


}





void hc595senddata(byte data){// 高位在前反相(1亮0灭)


for (byte i=0; i<8;i++) {


digitalWrite(CLK,0);


if (data & 0x80) {


digitalWrite(R1, 0); 


} else {


digitalWrite(R1, 1);


}


data=data<<1;


digitalWrite(CLK,1);


}





}








void setup () {





pinMode(RowA, OUTPUT);


pinMode(RowB, OUTPUT);


pinMode(RowC, OUTPUT);


pinMode(RowD, OUTPUT); //138片选


pinMode(hc138en, OUTPUT); //138 使能





pinMode(R1, OUTPUT);//595 数据


pinMode(CLK, OUTPUT); //595 时钟


pinMode(STB, OUTPUT); //595 使能


pinMode(DATAIN, INPUT); //595 使能








//digitalWrite(hc138d, HIGH);


Serial.begin(19200);





//SPI硬件设置


// SPCR = 01010000


//interrupt disabled,spi enabled,msb 1st,master,clk low when idle,


//sample on leading edge of clk,system clock/4 rate (fastest)


SPCR = (1<<SPE)|(1<<MSTR);


delay(10);


}





void loop () {


if (Serial.available() > 0) {


// read the incoming byte:


row = Serial.read();





// say what you got:


Serial.print("I received: ");


Serial.println(row, DEC);


}





for(row=0;row<16;row++){





for (int i=0;i<8;i++){ 


spi_transfer(~(zzz[i+row8])); 


}








digitalWrite(hc138en, 1);//关闭显示


hc138sacn(row);    //换行


digitalWrite(STB, 0);  //595刷新   


digitalWrite(STB, 1);


delayMicroseconds(500) ; //节电用,


digitalWrite(hc138en, 0);//开启显示





delayMicroseconds(500) ;//刷新频率调,差不多60HZ,1/16间隔





}





}


从上面代码可以轻松的看出驱动原理并不复杂，其实就是把取模软件生成的字模，储存到一个数组里，然后调用arduino的硬件SPI通讯接口，把每8个LED看成是一个十六进制编码，然后一行一行的发送出去，发完一行后，再发出换行指令，就是这么简单。
置于16*16单个汉字取模显示，只要把主loop里的代码改为即可，其实就是简单的数学原理，把数组里的十六进制数按照一组一组提取显示而已~
ARDUINO 代码复制打印
for(row=0;row<16;row++){  for (int i=0;i<4;i++){//8片595   //硬件SPI发送8字节耗时:22US      spi_transfer(~(zzz[i*32+row*2]));//硬件SPI     spi_transfer(~(zzz[i*32+row*2+1]));//硬件SPI    }
for(row=0;row<16;row++){



  for (int i=0;i<4;i++){//8片595

   //硬件SPI发送8字节耗时:22US   

   spi_transfer(~(zzz[i*32+row*2]));//硬件SPI  

   spi_transfer(~(zzz[i*32+row*2+1]));//硬件SPI  

  }


取模软件请选择横向顺序扫描~下载在附件哦~

QQ截图20130629170050.jpg

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字模III Pro.zip

(1.99 MB, 下载次数: 738)

2013-6-29 17:02 上传
点击文件名下载附件



下面就是小Z做的演示品~主控为Arduino Tiny~欢迎大家根据此来完成各种有趣的Ardunio点阵屏作品~希望此文能给大家拓宽一定的思维~

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标签: Arduino教程