144 lines
5.0 KiB
C++
144 lines
5.0 KiB
C++
/*
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TMRh20 2014 - Updated to work with optimized RF24 Arduino library
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*/
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/**
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* Example for efficient call-response using ack-payloads and interrupts
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*
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* This example continues to make use of all the normal functionality of the radios including
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* the auto-ack and auto-retry features, but allows ack-payloads to be written optionlly as well.
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* This allows very fast call-response communication, with the responding radio never having to
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* switch out of Primary Receiver mode to send back a payload, but having the option to switch to
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* primary transmitter if wanting to initiate communication instead of respond to a commmunication.
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*/
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#include <cstdlib>
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <unistd.h>
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#include <RF24/RF24.h>
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using namespace std;
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//
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// Hardware configuration
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// Configure the appropriate pins for your connections
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/****************** Raspberry Pi ***********************/
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RF24 radio(22,0); //GPIO, SPI-BUS
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/********** User Config *********/
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// Assign a unique identifier for this node, 0 or 1. Arduino example uses radioNumber 0 by default.
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bool radioNumber = 1;
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int interruptPin = 23;
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/********************************/
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// Radio pipe addresses for the 2 nodes to communicate.
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const uint8_t addresses[][6] = {"1Node","2Node"};
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volatile bool role_ping_out = 1, role_pong_back = 0, role = 0;
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uint8_t counter = 1; // A single byte to keep track of the data being sent back and forth
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volatile bool gotResponse = false;
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void intHandler(){
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if ( role == role_pong_back ) {
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uint8_t pipeNo, gotByte; // Declare variables for the pipe and the byte received
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if( radio.available(&pipeNo)){ // Read all available payloads
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radio.read( &gotByte, 1 );
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// Since this is a call-response. Respond directly with an ack payload.
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gotByte += 1; // Ack payloads are much more efficient than switching to transmit mode to respond to a call
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radio.writeAckPayload(pipeNo,&gotByte, 1 ); // This can be commented out to send empty payloads.
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printf("Loaded next response %d \n\r", gotByte);
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}
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}
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}
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int main(int argc, char** argv){
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cout << "RPi/RF24/examples/gettingstarted_call_response_int\n";
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radio.begin();
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radio.enableAckPayload(); // Allow optional ack payloads
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radio.enableDynamicPayloads();
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radio.printDetails(); // Dump the configuration of the rf unit for debugging
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/********* Role chooser ***********/
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printf("\n ************ Role Setup ***********\n");
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string input = "";
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char myChar = {0};
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cout << "Choose a role: Enter 0 for pong_back, 1 for ping_out (CTRL+C to exit)\n>";
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getline(cin,input);
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if(input.length() == 1) {
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myChar = input[0];
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if(myChar == '0'){
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cout << "Role: Pong Back, awaiting transmission " << endl << endl;
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}else{ cout << "Role: Ping Out, starting transmission " << endl << endl;
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role = role_ping_out;
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}
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}
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/***********************************/
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// This opens two pipes for these two nodes to communicate
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// back and forth.
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if ( !radioNumber ) {
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radio.openWritingPipe(addresses[0]);
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radio.openReadingPipe(1,addresses[1]);
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}else{
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radio.openWritingPipe(addresses[1]);
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radio.openReadingPipe(1,addresses[0]);
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}
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radio.startListening();
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radio.writeAckPayload(1,&counter,1);
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radio.maskIRQ(1,1,0); //Mask tx_ok & tx_fail interrupts
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attachInterrupt(interruptPin, INT_EDGE_FALLING, intHandler); //Attach interrupt to bcm pin 23
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// forever loop
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while (1){
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/****************** Ping Out Role ***************************/
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if (role == role_ping_out){ // Radio is in ping mode
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uint8_t gotByte; // Initialize a variable for the incoming response
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radio.stopListening(); // First, stop listening so we can talk.
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printf("Now sending %d as payload. ",counter); // Use a simple byte counter as payload
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unsigned long time = millis(); // Record the current microsecond count
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if ( radio.write(&counter,1) ){ // Send the counter variable to the other radio
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if(!radio.available()){ // If nothing in the buffer, we got an ack but it is blank
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printf("Got blank response. round-trip delay: %lu ms\n\r",millis()-time);
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}else{
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while(radio.available() ){ // If an ack with payload was received
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radio.read( &gotByte, 1 ); // Read it, and display the response time
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printf("Got response %d, round-trip delay: %lu ms\n\r",gotByte,millis()-time);
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counter++; // Increment the counter variable
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}
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}
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}else{ printf("Sending failed.\n\r"); } // If no ack response, sending failed
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sleep(1); // Try again later
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}
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/****************** Pong Back Role ***************************/
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} //while 1
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} //main
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