Linuxduino 0.2.0

Wire.endTransmission()

Ends a transmission to a slave device that was begun by beginTransmission() and transmits the bytes that were queued by write().

Syntax

Wire.endTransmission()
(!) Wire.endTransmission(stop) // Not available, no way to send an I2C stop msg to the driver.

Parameters

None

Returns

Returns the number of bytes transmitted, 0 if there was an error.

The return value is currently different from the reference see Arduino WireEndTransmission

Example

Javascript

const linuxduino = require('linuxduino');

// Testing I2C write
(async() => {
  // Wait for wasm file
  await linuxduino.ready;

  var world = new Buffer("World");
  
  // Open I2C port
  Wire = new linuxduino.Wire();
  Wire.begin("/dev/i2c-1");
  
  // Send Hello World! to device
  Wire.beginTransmission(8); // 7-bit device I2C address
  Wire.write("Hello");
  Wire.write(" ");
  Wire.write(world, world.length);
  var bytes_transmitted = Wire.endTransmission();
  // Make sure transmission was sucessful
  if (bytes_transmitted == 0 ) {
    console.log("Wrong I2C address or I2C wires may not be connected properly");
    return -1;
  }
  console.log("Hello World msg sent!");


  Wire.end();
  return 1;
})();

Run it

sudo node i2c_write.js

C++

#include "Linuxduino.h"

// Testing I2C write
int main(void) {

    char world[] = "World";

    Wire.begin("/dev/i2c-1");

    // Send Hello World! to device
    Wire.beginTransmission(8); // 7-bit device I2C address
    Wire.write("Hello");
    Wire.write(' ');
    Wire.write(world, strlen(world));
    int bytes_transmitted = Wire.endTransmission();
    // Make sure transmission was sucessful
    if (bytes_transmitted == 0 ) {
    	printf("Wrong I2C address or I2C wires may not be connected properly\n");
    	return -1;
    }
    printf("Hello World msg sent! \n");

    Wire.end();
    return 1;
}

Run it

g++ i2c_write.cpp -o i2c_write -llxduino
sudo ./i2c_write

← Wire.write()→