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Gambar 1. Arduino (SIMULANO)
Gambar 2. LCD
Gambar 3. LM35
2. Rangkaian
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3. Flowchart
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4. Listing Program
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master:
Gambar 4. Bentuk Hardware
2. Rangkaian
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Gambar 5. Rangkaian Simulasi
3. Flowchart
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4. Listing Program
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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(2000);
}
}
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);
}
}
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ANALISA PERCOBAAN 2 [SPI[:
1.
Apakah kit dapat menggunakan lebih dari 1
master? Jelaskan alasannya
Jawab: tidak, karena SPI selalu hanya ada
satu master device (biasanya mikrokontroller) yang mengontrol perangkat peripheral.
2.
Apakah port MISO harus digunakan? Jelaskan
alasannya
Jawab: port MISO harus digunakan , karena
MISO itu sebagaia pengirim data ke master. Jika tidak ada MISO yang dipakai ,
maka slave tidak bisa mengirimkan pesannya ke master.
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Download video disini.
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