Reference for Wiring version 0024+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Class

Wire

Name

requestFrom()

Examples
#include "TwoWire.h"

void setup()
{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
}

void loop()
{
  Wire.requestFrom(2, 6);    // request 6 bytes from slave device #2

  while(Wire.available())    // slave may send less than requested
  { 
    char c = Wire.receive(); // receive a byte as character
    Serial.print(c);         // print the character
  }

  delay(500);
}

Description The requestFrom() method start read a specified number of bytes from the device specified with a given address.
Syntax
Wire.requestFrom(address, quantity)
Parameters
address An int number between 0 and 127 specifying the address of the device to be read.
quantity An int number specifying the number of bytes to be read.
Wire The hardware TWI port
Returns int: The number of bytes read.
Usage Application
Updated on January 03, 2010 10:29:41pm PST

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