아두이노 통신 UNO TO UNO -#4

우노B의 연결은 우노A에서 오는 통신 시리얼통신 포트룰 2,3번 핀에 연결하는것과 

I2C통신을 위한 2핀과 VCC, GND를 포함하여 총 6개의 핀이 연결되어 있다.

 

우노B의 소스코드 부터 보자

 

#include <SoftwareSerial.h>
#include <LiquidCrystal_I2C.h>

SoftwareSerial sSerial= SoftwareSerial(2, 3);
//HardwareSerial&  sSerial = Serial2;
#define version 0x01
#define BAUD 9600 

typedef struct _Info
{ 
  char ver;
  char lcd_1[20+1];
  _Info()
  {
    ver = version;
    memset(lcd_1, 0x00, sizeof(char)*21);
  }
  
}Info;


//LiquidCrystal_I2C lcd(0x27,20,2);  
LiquidCrystal_I2C lcd(0x3F,20,2);  
volatile unsigned long previousMillis;

void print_lcd(Info& _info);
void read_serial(Info& _info);

void setup()
{
  Serial.begin(BAUD);
  sSerial.begin(BAUD);     
  previousMillis = millis();
   
  LCD_setup();
}

void LCD_setup()
{
  lcd.init();                      // initialize the lcd 
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("ARDUINO Start");
}

void loop() 
{          
  Info adcinfo;
  read_serial(adcinfo);
  print_lcd(adcinfo);

  static int time=0;
  unsigned long currentMillis = millis();
  if ((currentMillis-previousMillis)> 1000*1)
  {
      time++;
      char buf2[50];
      sprintf(buf2, "time:%4d sec ", time);         
      
      lcd.setCursor(0,1);
      lcd.print(buf2);   
      previousMillis = currentMillis;
      if(time > 1000) time = 0;
  }
  
  delay(10);
}

void read_serial(Info& _info)
{   
    memset(&_info, 0x00, sizeof(Info)); 
    if (sSerial.available())
    { 
          char  c; 
          char *p;
          
          p = (char*)&_info;
          while( (p -  ((char*)&_info)) < sizeof(Info) )
          {
              if(sSerial.available()) 
              {
                c = sSerial.read();
                //*p = c; p++; 
                *(p++) = c;
                *p = '\0';                
                if (c == '\r' || c == '\n') break;
              }
          }
          _info.ver = version;
    }
    
    return ;
}

void print_lcd(Info& _info)
{
    if(_info.ver==version)
    {
        char buf2[50];
        sprintf(buf2, "receive  ====> %dbyte \n", sizeof(Info));         
        Serial.write(buf2);
        
        lcd.setCursor(0,0);
        lcd.print("                  "); 
        lcd.setCursor(0,0);
        lcd.print(_info.lcd_1);   
    }
    
   return ; 
}