Float I2c

Projects Networking, Protocols, and Devices
8

An update. Sending multiple bytes at all during a requestEvent results in error.

I'm running on two Uno R3 arduinos.

Master uses requestFrom to ask for bytes. If I ask for one, it works, but if I ever ask for more than 1, they come back corrupted.

Master code:

#include <Wire.h>

int numReceived = 0;

void setup()
{
Wire.begin();        // join i2c bus (address optional for master)
Serial.begin(115200); 
}

void loop()
{
  numReceived = 0;
  Wire.requestFrom(2, 2);

  while(Wire.available())
  {
  byte c = Wire.read(); 
  Serial.print("Received: ");
  Serial.print(c);         
  Serial.println(" . ");
  numReceived++;
  }

  delay(500);
  Serial.print(" Received "); 
  Serial.print(numReceived);
  Serial.println(" bytes.  ");
}

Slave code:

#include <Wire.h>

byte val1 = 0;
byte val2 = 1;

void setup()
{
Wire.begin(2);                // join i2c bus with address #2
Wire.onRequest(requestEvent); // register event
}

void loop()
{
delay(100);
}

void requestEvent()
{
  Wire.write(val1); 
  Wire.write(val2);
}

Output is :

Received: 1 .
Received: 255 .
Received 2 bytes.

What is happening here?

-Eric