Laporan Akhir 2 Percobaan 2

Percobaan 2 -  SPI

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DAFTAR ISI

1. Hardware

2. Rangkaian Simulasi

3. Flowchart

4. Listing Program

5. Video

6. Link Download

1. Hardawe [kembali]

2. Rangkaian Simulasi [kembali]

3. Flowchart [kembali] 

 

4. Listing Program [kembali]

//SPI MASTER (ARDUINO)

#include<SPI.h>                             //Library for SPI
#define LED 7       
#define ipbutton 2
int buttonvalue;
int x;
void setup (void)

{
  Serial.begin(115200);                   //Starts Serial Communication at Baud Rate 115200

  pinMode(ipbutton,INPUT);                //Sets pin 2 as input
  pinMode(LED,OUTPUT);                    //Sets pin 7 as Output

  SPI.begin();                            //Begins the SPI commnuication
  SPI.setClockDivider(SPI_CLOCK_DIV8);    //Sets clock for SPI communication at 8 (16/8=2Mhz)
  digitalWrite(SS,HIGH);                  // Setting SlaveSelect as HIGH (So master doesnt connnect with slave)
}

void loop(void)
{
  byte Mastersend,Mastereceive;          

  buttonvalue = digitalRead(ipbutton);   //Reads the status of the pin 2

  if(buttonvalue == HIGH)                //Logic for Setting x value (To be sent to slave) depending upon input from pin 2
  {
    x = 1;
  }
  else
  {
    x = 0;
  }

  digitalWrite(SS, LOW);                  //Starts communication with Slave connected to master

  Mastersend = x;                         
  Mastereceive=SPI.transfer(Mastersend); //Send the mastersend value to slave also receives value from slave

  if(Mastereceive == 1)                   //Logic for setting the LED output depending upon value received from slave
  {
    digitalWrite(LED,HIGH);              //Sets pin 7 HIGH
    Serial.println("Master LED ON");
  }
  else
  {
   digitalWrite(LED,LOW);               //Sets pin 7 LOW
   Serial.println("Master LED OFF");
  }
  delay(1000);
}

Slave Arduino Code:
//SPI SLAVE (ARDUINO)

#include<SPI.h>
#define LEDpin 7
#define buttonpin 2
volatile boolean received;
volatile byte Slavereceived,Slavesend;
int buttonvalue;
int x;
void setup()

{
  Serial.begin(115200);

  pinMode(buttonpin,INPUT);               // Setting pin 2 as INPUT
  pinMode(LEDpin,OUTPUT);                 // Setting pin 7 as OUTPUT
  pinMode(MISO,OUTPUT);                   //Sets MISO as OUTPUT (Have to Send data to Master IN 

  SPCR |= _BV(SPE);                       //Turn on SPI in Slave Mode
  received = false;

  SPI.attachInterrupt();                  //Interuupt ON is set for SPI commnucation

}

ISR (SPI_STC_vect)                        //Inerrrput routine function
{
  Slavereceived = SPDR;         // Value received from master if store in variable slavereceived
  received = true;                        //Sets received as True
}

void loop()
{ if(received)                            //Logic to SET LED ON OR OFF depending upon the value recerived from master
   {
      if (Slavereceived==1)
      {
        digitalWrite(LEDpin,HIGH);         //Sets pin 7 as HIGH LED ON
        Serial.println("Slave LED ON");
      }else
      {
        digitalWrite(LEDpin,LOW);          //Sets pin 7 as LOW LED OFF
        Serial.println("Slave LED OFF");
      }
   
      buttonvalue = digitalRead(buttonpin);  // Reads the status of the pin 2
   
      if (buttonvalue == HIGH)               //Logic to set the value of x to send to master
      {
        x=1;
     
      }else
      {
        x=0;
      }
   
  Slavesend=x;                         
  SPDR = Slavesend;                           //Sends the x value to master via SPDR
  delay(1000);
}
}

5. Video [kembali]

1.      Analisa  apa yang terjadi jika tidak ada delay (Master) pada percobaan diatas

Fungsi delay()
Cara kerja fungsi Delay () cukup sederhana. Fungsi ini menerima argumen bilangan bulat (bilangan). Bilangan ini merepresentasikan waktu (diukur dalam milidetik). Program harus menunggu sampai pindah ke baris kode berikutnya ketika bertemu fungsi ini

Jika tidak ada delay (master) pada percobaan diatas ketika kita menekan tombol button maka led akan lansung menyala

6. Link Download [kembali]

• Listing Program Link Download
• Video Link Download
• Simulasi Proteus Link Download

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