初始化提交
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王立帮
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/*
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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 <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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/****************** Linux ***********************/
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// Radio CE Pin, CSN Pin, SPI Speed
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// CE Pin uses GPIO number with BCM and SPIDEV drivers, other platforms use their own pin numbering
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// CS Pin addresses the SPI bus number at /dev/spidev<a>.<b>
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// ie: RF24 radio(<ce_pin>, <a>*10+<b>); spidev1.0 is 10, spidev1.1 is 11 etc..
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// Generic:
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RF24 radio(22,0);
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/****************** Linux (BBB,x86,etc) ***********************/
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// See http://tmrh20.github.io/RF24/pages.html for more information on usage
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// See http://iotdk.intel.com/docs/master/mraa/ for more information on MRAA
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// See https://www.kernel.org/doc/Documentation/spi/spidev for more information on SPIDEV
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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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/********************************/
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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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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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{
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cout << "RPi/RF24/examples/gettingstarted_call_response\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 {
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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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// 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 {
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printf("Sending failed.\n\r");
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} // 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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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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delay(900); //Delay after a response to minimize CPU usage on RPi
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//Expects a payload every second
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}
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}
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} //while 1
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} //main
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