69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
// Wire Slave Receiver
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// by Nicholas Zambetti <http://www.zambetti.com>
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// Demonstrates use of the Wire library
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// Receives data as an I2C/TWI slave device
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// Refer to the "Wire Master Writer" example for use with this
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// Created 29 March 2006
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// This example code is in the public domain.
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#include <Wire_slave.h>
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//#define Serial Serial1
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#define MasterWire Wire
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#define SlaveWire Wire1
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#define ENABLE_SLAVE
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#define ENABLE_MASTER
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void receiveEvent(int howMany);
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void setup(){
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Serial.begin(115200); // start serial for output
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#ifdef ENABLE_MASTER
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MasterWire.begin(); // join i2c bus #1 as master
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Serial.println("Done with MasterWire.begin ");
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#endif
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#ifdef ENABLE_SLAVE
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SlaveWire.begin(4); // join i2c bus #2 as slave with address #4
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Serial.println("Done with SlaveWire.begin ");
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#endif
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#ifdef ENABLE_SLAVE
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SlaveWire.onReceive(receiveEvent); // register event
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#endif
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}
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void loop(){
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#ifdef ENABLE_MASTER
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static byte x = 0;
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Serial.print("Master writing ");
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Serial.println(x);
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MasterWire.beginTransmission(4); // transmit to device #4
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MasterWire.write("x is "); // sends five bytes
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MasterWire.write(x); // sends one byte
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MasterWire.endTransmission(); // stop transmitting
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x++;
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#endif
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delay(500);
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}
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// function that executes whenever data is received from master
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// this function is registered as an event, see setup()
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// Note that it is not advicable to call Serial.print() from within an ISR
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void receiveEvent(int howMany){
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//Serial.print("Slave receving ");
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while(1 < SlaveWire.available()){ // loop through all but the last
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char c = SlaveWire.read(); // receive byte as a character
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Serial.print(c); // print the character
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}
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int x = SlaveWire.read(); // receive byte as an integer
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Serial.println(x); // print the integer
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}
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