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#include<SPI.h> char buf[100]; byte c=0,b=0; volatile byte pos; volatile boolean processing; byte i; void setup(void) { // put your setup code here, to run once: Serial.begin(9600); pinMode(MISO,OUTPUT); pinMode(MOSI,INPUT); SPCR |= _BV(SPE); pos = 0; processing = false; SPI.attachInterrupt(); } ISR(SPI_STC_vect){ c = SPDR; // SPDR = 0x55; // if(pos<20){ // buf[pos++] = c; // if(c == '\n') // processing=true; // } processing = true; } void loop(void) { // put your main code here, to run repeatedly: if(processing){ // Serial.println("Inside Processing"); Serial.println(c); processing = false; SPDR = i; i = i+1; } }
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