TMRh20
2406e06a77
Added support for hardware SPI on RPI per jscrane fork: - Fixed a few bugs with single SPI transfers - Aligned with optimized RF24 library fork - Updated bmc2835 files per http://www.airspayce.com/mikem/bcm2835/index.html - Merged bcm files with changes from https://github.com/farconada/RF24Network - Added example files - Added setup info to readme
139 lines
5.1 KiB
C++
139 lines
5.1 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
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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 "./RF24.h"
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using namespace std;
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//
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// Hardware configuration
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//
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// CE Pin, CSN Pin, SPI Speed
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// Setup for GPIO 22 CE and GPIO 25 CSN with SPI Speed @ 1Mhz
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//RF24 radio(RPI_V2_GPIO_P1_22, RPI_V2_GPIO_P1_18, BCM2835_SPI_SPEED_1MHZ);
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// Setup for GPIO 22 CE and CE0 CSN with SPI Speed @ 4Mhz
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//RF24 radio(RPI_V2_GPIO_P1_15, BCM2835_SPI_CS0, BCM2835_SPI_SPEED_4MHZ);
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// Setup for GPIO 22 CE and CE1 CSN with SPI Speed @ 8Mhz
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RF24 radio(RPI_V2_GPIO_P1_15, BCM2835_SPI_CS0, BCM2835_SPI_SPEED_8MHZ);
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// Radio pipe addresses for the 2 nodes to communicate.
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const uint64_t addresses[2] = { 0xABCDABCD71LL, 0x544d52687CLL };
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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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int main(int argc, char** argv){
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printf("RF24/examples/gettingstarted_call_response\n");
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radio.begin();
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radio.setAutoAck(1); // Ensure autoACK is enabled
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radio.enableAckPayload(); // Allow optional ack payloads
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radio.setRetries(1,15); // Smallest time between retries, max no. of retries
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radio.setPayloadSize(1); // Here we are sending 1-byte payloads to test the call-response speed
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//radio.powerUp();
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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 simple sketch opens two pipes for these two nodes to communicate
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// back and forth.
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if ( role == role_ping_out ) {
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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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radio.startListening();
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}
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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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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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while( 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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// 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("Sent response %d \n\r", gotByte);
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}
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}
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} //while 1
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} //main
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