Red Butterfly

TUGAS PENDAHULUAN MODUL 3





1. Kondisi [back]

    Kondisi yang digunakan pada tugas pendahuluan ini adalah percobaan 2 (SPI) kondisi 6 yaitu Menambahkan Resistor sebelum LED sebesar 1k Ohm pada rangkaian percobaan.


2. Rangkaian Simulasi [back]




3. Flowchart [back] 

 -Master



-Slave



4. Listing Program [back]

-Master

#include <SPI.h> //Deklarasi library SPI
#define button 2
void setup (void) {
  pinMode(button, INPUT_PULLUP);
  Serial.begin(115200 ); //Set baud rate 115200
  digitalWrite(SS, HIGH);
  // disable Slave Select
  SPI.begin ();
  SPI.setClockDivider(SPI_CLOCK_DIV8); //divide the clock by 8
}
void loop (void) {
  char c;
  int nilai=digitalRead(button);
  if(nilai==0){
   digitalWrite(SS, LOW); //enable Slave Select
  // send test string
  for (const char * p = "Hello, world!\r" ; c = *p; p++)
  {
    SPI.transfer (c);
    Serial.print(c);
  }
  digitalWrite(SS, HIGH); // disable Slave Select
  delay(1000);
  }

-Slave

#include <SPI.h>
#define led 2

char buff [50];
volatile byte indx;
volatile boolean process;

void setup (void) {
  Serial.begin (115200);
  pinMode(led, OUTPUT); // have to send on master in so it set as output
  SPCR |= _BV(SPE); // turn on SPI in slave mode
  indx = 0; // buffer empty
  process = false;
  SPI.attachInterrupt(); // turn on interrupt
}

ISR (SPI_STC_vect) // SPI interrupt routine
{
  byte c = SPDR; // read byte from SPI Data Register
  if (indx < sizeof buff) {
    buff [indx++] = c; // save data in the next index in the array buff
    if (c == '\r') //check for the end of the word
      process = true;
  }
}
void loop (void) {
  if (process) {
    digitalWrite(led, HIGH);
    process = false; //reset the process
    Serial.println (buff); //print the array on serial monitor
    indx = 0; //reset button to zero
    delay(1000);
  }
  else
  {
    digitalWrite(led, LOW);
  }

5. Video [back]








6. Link Download [back] 
Simulasi Proteus - Download
File Program - Master dan Slave
Video - Download


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