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#include <SPI.h>
// * CS - to digital pin 10 (SS pin)
// * SDI - to digital pin 11 (MOSI pin)
// * SDI - to digital pin 12 (MISO pin)
// * CLK - to digital pin 13 (SCK pin)
// Vorbereitungen um als Slave Daten zu empfangen
char recieve_buff [100];
volatile byte pos;
volatile boolean process_it;
// PINS fuer SPI
const int slaveSelectPin = 10;
const int miso = 12;
const int mosi = 11;
const int ledPin = 2;
void setup() {
pinMode(slaveSelectPin, INPUT);
pinMode(miso, OUTPUT);
// SPI als Slave aktivieren
SPCR |= _BV(SPE);
// interrupt vorbereitung
pos =0; //recieve Buffer leer
process_it = false;
SPI.attachInterrupt();
// initialize the digital pin as an output.
pinMode(ledPin, OUTPUT);
digitalWrite (ledPin, HIGH);
delay(1000);
digitalWrite (ledPin, LOW);
}
//PINS/Bitmask fuer LEDs
int LED0 = 0x01;
int LED1 = 0x02;
int LED2 = 0x04;
int LED3 = 0x08;
int PWM_BASE = 15;
ISR (SPI_STC_vect)
{
byte c = SPDR;
if (pos < sizeof recieve_buff)
{
recieve_buff[pos++] = c;
process_it = true;
}
}
void loop()
{
//Verarbeitung der empfangenen Nachricht
if (process_it == true)
{
if (recieve_buff[pos] == 0x31)
digitalWrite (ledPin, HIGH);
else if (recieve_buff[pos] == 0x30)
digitalWrite (ledPin, LOW);
process_it == false;
pos = 0;
}
}
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