1. Kondisi [Kembali]
Kondisi yang digunakan pada tugas pendahuluan ini adalah percobaan 2 kondisi 7 yaitu gambar sesuai percobaan SPI dengan menambahkan resistor 1 ohm sebelum LED.
2. Gambar Rangkaian Simulasi [Kembali]
4. Listing Program [Kembali]
//MASTER#include <SPI.h> //Deklarasi library SPI
#define button 5
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(2000);
}
}
//SLAVE
#include <SPI.h>
#define led 7
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);
}
}
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