项目21-LED点阵-滚动信息

#include <TimerOne.h>

#include <avr/pgmspace.h>

int DataPin = 2;  //DIN

int LoadPin = 3;  //CS

int ClockPin = 4; //CLK

#define SCAN_LIMIT 0X0b //扫描长度寄存器

#define DECODE_MODE 0X09  //小数点模式寄存器

#define SHUTDOWN 0X0C   //关闭模式寄存器

#define INTENSITY 0X0A //亮度寄存器

byte buffer[8];

const byte font[][8] PROGMEM = {

  {B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000},

  {B00000100,B00000100,B00000100,B00000100,B00000100,B00000100,B00000000,B00000100},

  {B00001010,B00001010,B00001010,B00000000,B00000000,B00000000,B00000000,B00000000},

  {B00000000,B00001010,B00011111,B00001010,B00011111,B00001010,B00011111,B00001010},

  {B00000111,B00001100,B00010100,B00001100,B00000110,B00000101,B00000110,B00011100},

  {B00011001,B00011010,B00000010,B00000100,B00000100,B00001000,B00001011,B00010011},

  {B00000110,B00001010,B00010010,B00010100,B00001001,B00010110,B00010110,B00001001},

  {B00000100,B00000100,B00000100,B00000000,B00000000,B00000000,B00000000,B00000000},

  {B00000010,B00000100,B00001000,B00001000,B00001000,B00001000,B00000100,B00000010},

  {B00001000,B00000100,B00000010,B00000010,B00000010,B00000010,B00000100,B00001000},

  {B00010101,B00001110,B00011111,B00001110,B00010101,B00000000,B00000000,B00000000},

  {B00000000,B00000000,B00001000,B00000100,B00011111,B00000100,B00000100,B00000000},

  {B00000000,B00000000,B00000000,B00000000,B00000000,B00000110,B00000100,B00001000},

  {B00000000,B00000000,B00000000,B00000000,B00001110,B00000000,B00000000,B00000000},

  {B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000100},

  {B00000001,B00000010,B00000010,B00000100,B00000100,B00001000,B00001000,B00010000},

  {B00001110,B00010001,B00010011,B00010001,B00010101,B00010001,B00011001,B00001110},

  {B00000100,B00001100,B00010100,B00000100,B00000100,B00000100,B00000100,B00011111},

  {B00001110,B00010001,B00010001,B00000010,B00000100,B00001000,B00010000,B00011111},

  {B00001110,B00010001,B00000001,B00001110,B00000001,B00000001,B00010001,B00001110},

  {B00010000,B00010000,B00010100,B00010100,B00011111,B00000100,B00000100,B00000100},

  {B00011111,B00010000,B00010000,B00011110,B00000001,B00000001,B00000001,B00011110},

  {B00000111,B00001000,B00010000,B00011110,B00010001,B00010001,B00010001,B00011110},

  {B00011111,B00000001,B00000001,B00000001,B00000010,B00000100,B00001000,B00010000},

  {B00001110,B00010001,B00010001,B00001110,B00010001,B00010001,B00010001,B00001110},

  {B00001110,B00010001,B00010001,B00001111,B00000001,B00000001,B00000001,B00000001},

  {B00000000,B00000100,B00000100,B00000000,B00000000,B00000100,B00000100,B00000000},

  {B00000000,B00000100,B00000100,B00000000,B00000000,B00000100,B00000100,B00001000},

  {B00000001,B00000010,B00000100,B00001000,B00001000,B00000100,B00000010,B00000001},

  {B00000000,B00000000,B00000000,B00011110,B00000000,B00011110,B00000000,B00000000},

  {B00010000,B00001000,B00000100,B00000010,B00000010,B00000100,B00001000,B00010000},

  {B00001110,B00010001,B00010001,B00000010,B00000100,B00000100,B00000000,B00000100},

  {B00001110,B00010001,B00010001,B00010101,B00010101,B00010001,B00010001,B00011110},

  {B00001110,B00010001,B00010001,B00010001,B00011111,B00010001,B00010001,B00010001},

  {B00011110,B00010001,B00010001,B00011110,B00010001,B00010001,B00010001,B00011110},

  {B00000111,B00001000,B00010000,B00010000,B00010000,B00010000,B00001000,B00000111},

  {B00011100,B00010010,B00010001,B00010001,B00010001,B00010001,B00010010,B00011100},

  {B00011111,B00010000,B00010000,B00011110,B00010000,B00010000,B00010000,B00011111},

  {B00011111,B00010000,B00010000,B00011110,B00010000,B00010000,B00010000,B00010000},

  {B00001110,B00010001,B00010000,B00010000,B00010111,B00010001,B00010001,B00001110},

  {B00010001,B00010001,B00010001,B00011111,B00010001,B00010001,B00010001,B00010001},

  {B00011111,B00000100,B00000100,B00000100,B00000100,B00000100,B00000100,B00011111},

  {B00011111,B00000100,B00000100,B00000100,B00000100,B00000100,B00010100,B00001000},

  {B00010001,B00010010,B00010100,B00011000,B00010100,B00010010,B00010001,B00010001},

  {B00010000,B00010000,B00010000,B00010000,B00010000,B00010000,B00010000,B00011111},

  {B00010001,B00011011,B00011111,B00010101,B00010001,B00010001,B00010001,B00010001},

  {B00010001,B00011001,B00011001,B00010101,B00010101,B00010011,B00010011,B00010001},

  {B00001110,B00010001,B00010001,B00010001,B00010001,B00010001,B00010001,B00001110},

  {B00011110,B00010001,B00010001,B00011110,B00010000,B00010000,B00010000,B00010000},

  {B00001110,B00010001,B00010001,B00010001,B00010001,B00010101,B00010011,B00001111},

  {B00011110,B00010001,B00010001,B00011110,B00010100,B00010010,B00010001,B00010001},

  {B00001110,B00010001,B00010000,B00001000,B00000110,B00000001,B00010001,B00001110},

  {B00011111,B00000100,B00000100,B00000100,B00000100,B00000100,B00000100,B00000100},

  {B00010001,B00010001,B00010001,B00010001,B00010001,B00010001,B00010001,B00001110},

  {B00010001,B00010001,B00010001,B00010001,B00010001,B00010001,B00001010,B00000100},

  {B00010001,B00010001,B00010001,B00010001,B00010001,B00010101,B00010101,B00001010},

  {B00010001,B00010001,B00001010,B00000100,B00000100,B00001010,B00010001,B00010001},

  {B00010001,B00010001,B00001010,B00000100,B00000100,B00000100,B00000100,B00000100},

  {B00011111,B00000001,B00000010,B00000100,B00001000,B00010000,B00010000,B00011111},

  {B00001110,B00001000,B00001000,B00001000,B00001000,B00001000,B00001000,B00001110},

  {B00010000,B00001000,B00001000,B00000100,B00000100,B00000010,B00000010,B00000001},

  {B00001110,B00000010,B00000010,B00000010,B00000010,B00000010,B00000010,B00001110},

  {B00000100,B00001010,B00001001,B00000000,B00000000,B00000000,B00000000,B00000000},

  {B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00011111},

  {B00001000,B00000100,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000},

  {B00000000,B00000000,B00000000,B00001110,B00010010,B00010010,B00010010,B00001111},

  {B00000000,B00010000,B00010000,B00010000,B00011100,B00010010,B00010010,B00011100},

  {B00000000,B00000000,B00000000,B00011100,B00010000,B00010000,B00010000,B00001110},

  {B00000000,B00000001,B00000001,B00000001,B00000111,B00001001,B00001001,B00000111},

  {B00000000,B00000000,B00000000,B00011100,B00010010,B00011110,B00010000,B00001110},

  {B00000000,B00000011,B00000100,B00000100,B00000110,B00000100,B00000100,B00000100},

  {B00000000,B00001110,B00001010,B00001010,B00001110,B00000010,B00000010,B00001100},

  {B00000000,B00010000,B00010000,B00010000,B00011100,B00010010,B00010010,B00010010},

  {B00000000,B00000000,B00000100,B00000000,B00000100,B00000100,B00000100,B00000100},

  {B00000000,B00000010,B00000000,B00000010,B00000010,B00000010,B00000010,B00001100},

  {B00000000,B00010000,B00010000,B00010100,B00011000,B00011000,B00010100,B00010000},

  {B00000000,B00010000,B00010000,B00010000,B00010000,B00010000,B00010000,B00001100},

  {B00000000,B00000000,B00000000,B00001010,B00010101,B00010001,B00010001,B00010001},

  {B00000000,B00000000,B00000000,B00010100,B00011010,B00010010,B00010010,B00010010},

  {B00000000,B00000000,B00000000,B00001100,B00010010,B00010010,B00010010,B00001100},

  {B00000000,B00011100,B00010010,B00010010,B00011100,B00010000,B00010000,B00010000},

  {B00000000,B00001110,B00010010,B00010010,B00001110,B00000010,B00000010,B00000001},

  {B00000000,B00000000,B00000000,B00001010,B00001100,B00001000,B00001000,B00001000},

  {B00000000,B00000000,B00001110,B00010000,B00001000,B00000100,B00000010,B00011110},

  {B00000000,B00010000,B00010000,B00011100,B00010000,B00010000,B00010000,B00001100},

  {B00000000,B00000000,B00000000,B00010010,B00010010,B00010010,B00010010,B00001100},

  {B00000000,B00000000,B00000000,B00010001,B00010001,B00010001,B00001010,B00000100},

  {B00000000,B00000000,B00000000,B00010001,B00010001,B00010001,B00010101,B00001010},

  {B00000000,B00000000,B00000000,B00010001,B00001010,B00000100,B00001010,B00010001},

  {B00000000,B00000000,B00010001,B00001010,B00000100,B00001000,B00001000,B00010000},

  {B00000000,B00000000,B00000000,B00011111,B00000010,B00000100,B00001000,B00011111},

  {B00000010,B00000100,B00000100,B00000100,B00001000,B00000100,B00000100,B00000010},

  {B00000100,B00000100,B00000100,B00000100,B00000100,B00000100,B00000100,B00000100},

  {B00001000,B00000100,B00000100,B00000100,B00000010,B00000100,B00000100,B00001000},

  {B00000000,B00000000,B00000000,B00001010,B00011110,B00010100,B00000000,B00000000},

};

//初始化寄存器

void initMAX7219() {

  pinMode(DataPin, OUTPUT);

  pinMode(LoadPin, OUTPUT);

  pinMode(ClockPin, OUTPUT);

  writeData(SCAN_LIMIT, B00000111);

  writeData(DECODE_MODE, B00000000);

  writeData(SHUTDOWN, B00000001);

  writeData(INTENSITY, B00001111);

}

//清除数据

void clearDisplay() {

  for (byte x=0; x<8; x++) {

    buffer[x] = B00000000;

  }

  screenUpdata();

}

//LED灯控制

void screenUpdata() {

  for (byte row = 0; row<8; row++) {

    writeData(row+1, buffer[row]);

  }

}

//传入数据到寄存器

void writeData(byte msb, byte lsb) {

  digitalWrite(LoadPin, LOW);

  shiftOut(DataPin, ClockPin, MSBFIRST, (msb)); //传入地址

  shiftOut(DataPin, ClockPin, MSBFIRST, (lsb)); //传入参数

  digitalWrite(LoadPin, HIGH);

}

void scroll (char myString[], int rate) {

  byte ledOutput;

  byte firstChr, secondChr;

  byte Char1, Char2;

  byte strLength = 0;

  byte scrollBit = 0;

  byte chrIndex = 0; //初始化字符串位置指针

  unsigned long counter;

  unsigned long time;

  while (myString[strLength]){strLength++;} //获取字符串长度

  counter = millis();

  while(chrIndex < strLength) {

    time = millis();

    if (time > (counter+rate)) {

       Char1 = constrain(myString[chrIndex],32,126);

      Char2 = constrain(myString[chrIndex+1],32,126);

      for (byte j = 0; j<8; j++) {

        firstChr = pgm_read_byte(&font[Char1-32][j]);

        secondChr = pgm_read_byte(&font[Char2-32][j]);

        ledOutput = (firstChr << scrollBit)|(secondChr >> (8-scrollBit));

        buffer[j] = ledOutput;

      }

      scrollBit++;

      if (scrollBit >6) {

        scrollBit = 0;

        chrIndex++;

      }

      counter = millis();

    }

   

  }

}

void setup() {

  initMAX7219();

  Timer1.initialize(10000);

  Timer1.attachInterrupt(screenUpdata);

}

void loop() {

  clearDisplay();

  scroll("Apple", 200);

  scroll("I LOVE YOU", 200);

}