Hello everyone,
Can you help me with my code. I have attached it below
I am using the Nick Gammon example code and have also included some print statements for debugging.
The output of both master and slave has been attached. It is printing garbage value.
Master code
#include <SPI.h>
void setup (void) {
Serial.begin(115200); //set baud rate to 115200
digitalWrite(SS, HIGH); // disable Slave Select
SPI.begin ();
SPI.setClockDivider(SPI_CLOCK_DIV8);//divide the clock by 8
}
void loop (void) {
char c;
digitalWrite(SS, LOW); // enable Slave Select
Serial.println(" SS is enabled now");
// send test string
for (const char * p = "Hello, world!\r" ; c = *p; p++) {
SPI.transfer (c);
Serial.print(c);
}
Serial.println(" Data should have been sent");
digitalWrite(SS, HIGH); // disable Slave Select
delay(2000);
}
Slave Code
#include <SPI.h>
char buff [50];
volatile byte indx;
volatile boolean process;
void setup (void) {
Serial.begin (115200);
pinMode(MISO, 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) {
Serial.println("Slave start");
Serial.println(process);
if (process) {
process = false; //reset the process
Serial.println (buff); //print the array on serial monitor
indx= 0; //reset button to zero
}
}
-Thanks in Advance for your help and time!
