125 lines
6.1 KiB
Arduino
125 lines
6.1 KiB
Arduino
/*
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March 2014 - TMRh20 - Updated along with High Speed RF24 Library fork
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Parts derived from examples by J. Coliz <maniacbug@ymail.com>
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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 <SPI.h>
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#include "nRF24L01.h"
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#include "RF24.h"
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#include "printf.h"
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// Hardware configuration: Set up nRF24L01 radio on SPI bus plus pins 9 & 10
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RF24 radio(7,8);
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// Topology
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const uint64_t addresses[2] = { 0xABCDABCD71LL, 0x544d52687CLL }; // Radio pipe addresses for the 2 nodes to communicate.
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// Role management: Set up role. This sketch uses the same software for all the nodes
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// in this system. Doing so greatly simplifies testing.
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typedef enum { role_ping_out = 1, role_pong_back } role_e; // The various roles supported by this sketch
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const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"}; // The debug-friendly names of those roles
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role_e role = role_pong_back; // The role of the current running sketch
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byte counter = 1; // A single byte to keep track of the data being sent back and forth
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void setup(){
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Serial.begin(57600);
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printf_begin();
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printf("\n\rRF24/examples/GettingStarted/\n\r");
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printf("ROLE: %s\n\r",role_friendly_name[role]);
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printf("*** PRESS 'T' to begin transmitting to the other node\n\r");
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// Setup and configure radio
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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(0,15); // 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.openWritingPipe(addresses[1]); // Both radios listen on the same pipes by default, and switch when writing
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radio.openReadingPipe(1,addresses[0]); // Open a reading pipe on address 0, pipe 1
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radio.startListening(); // Start listening
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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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}
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void loop(void) {
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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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byte 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 = micros(); // 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 microseconds\n\r",micros()-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 microseconds\n\r",gotByte,micros()-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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delay(1000); // 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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byte 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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/****************** Change Roles via Serial Commands ***************************/
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if ( Serial.available() )
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{
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char c = toupper(Serial.read());
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if ( c == 'T' && role == role_pong_back )
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{
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printf("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK\n\r");
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role = role_ping_out; // Change roles (ping out)
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radio.openWritingPipe(addresses[0]); // Open different pipes when writing. Write on pipe 0, address 0
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radio.openReadingPipe(1,addresses[1]); // Read on pipe 1, as address 1
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}
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else if ( c == 'R' && role == role_ping_out )
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{
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printf("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK\n\r");
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role = role_pong_back; // Become the primary receiver (pong back)
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radio.openWritingPipe(addresses[1]); // Since only two radios involved, both listen on the same addresses and pipe numbers in RX mode
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radio.openReadingPipe(1,addresses[0]); // then switch pipes & addresses to transmit.
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radio.startListening(); // Need to start listening after opening new reading pipes
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}
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}
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}
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