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Added ack payload. Added a sample using pingpair as a base with minimal changes.

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maniacbug
2011-04-30 15:31:04 -07:00
parent a88e78a0da
commit 79628e7849
7 changed files with 703 additions and 8 deletions
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examples/pingpair_pl/pingpair_pl.pde Normal file
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/*
Copyright (C) 2011 James Coliz, Jr. <maniacbug@ymail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
*/
/**
* Example RF Radio Ping Pair
*
* This is an example of how to use the RF24 class. Write this sketch to two different nodes,
* connect the role_pin to ground on one. The ping node sends the current time to the pong node,
* which responds by sending the value back. The ping node can then see how long the whole cycle
* took.
*/
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"
//
// Hardware configuration
//
// Set up nRF24L01 radio on SPI bus plus pins 8 & 9
RF24 radio(8,9);
// sets the role of this unit in hardware. Connect to GND to be the 'pong' receiver
// Leave open to be the 'ping' transmitter
const short role_pin = 7;
const short led_pin = 13; // flash the led when a packet has been sent
//
// Topology
//
// Radio pipe addresses for the 2 nodes to communicate.
const uint64_t pipes[2] = { 0xE8E8F0F0E1LL, 0xE8E8F0F0D2LL };
//
// Role management
//
// Set up role. This sketch uses the same software for all the nodes
// in this system. Doing so greatly simplifies testing. The hardware itself specifies
// which node it is.
//
// This is done through the role_pin
//
// The various roles supported by this sketch
typedef enum { role_ping_out = 1, role_pong_back } role_e;
// The debug-friendly names of those roles
const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"};
// The role of the current running sketch
role_e role;
void setup(void)
{
//
// Role
//
// set up the role pin
pinMode(role_pin, INPUT);
digitalWrite(role_pin,HIGH);
delay(20); // Just to get a solid reading on the role pin
// read the address pin, establish our role
if ( digitalRead(role_pin) )
role = role_ping_out;
else
role = role_pong_back;
//
// Print preamble
//
Serial.begin(9600);
printf_begin();
printf("\n\rRF24/examples/pingpair_pl/\n\r");
printf("ROLE: %s\n\r",role_friendly_name[role]);
//
// Setup and configure rf radio
//
radio.begin();
// We will be using the Ack Payload feature, so please enable it
radio.enableAckPayload();
//
// Open pipes to other nodes for communication
//
// This simple sketch opens two pipes for these two nodes to communicate
// back and forth.
// Open 'our' pipe for writing
// Open the 'other' pipe for reading, in position #1 (we can have up to 5 pipes open for reading)
if ( role == role_ping_out )
{
radio.openWritingPipe(pipes[0]);
radio.openReadingPipe(1,pipes[1]);
}
else
{
radio.openWritingPipe(pipes[1]);
radio.openReadingPipe(1,pipes[0]);
}
//
// Start listening
//
radio.startListening();
//
// Dump the configuration of the rf unit for debugging
//
radio.printDetails();
}
void loop(void)
{
//
// Ping out role. Repeatedly send the current time
//
if (role == role_ping_out)
{
// First, stop listening so we can talk.
radio.stopListening();
// Take the time, and send it. This will block until complete
unsigned long time = millis();
printf("Now sending %lu...",time);
radio.write( &time, sizeof(unsigned long) );
if ( radio.isAckPayloadAvailable() )
{
static char response[32];
radio.read(response,32);
printf("Ack: [%s]",response);
// try flushing the rx buffer to get the ack packet out of the system ...
radio.flush_rx();
}
// Now, continue listening
radio.startListening();
// Wait here until we get a response, or timeout (250ms)
unsigned long started_waiting_at = millis();
bool timeout = false;
while ( ! radio.available() && ! timeout )
if (millis() - started_waiting_at > 500 )
timeout = true;
// Describe the results
if ( timeout )
{
printf("Failed, response timed out.\n\r");
}
else
{
// Stop listening while we are clocking out the data
radio.stopListening();
// Dump the payloads until we've gotten everything
unsigned long got_time;
boolean done = false;
while (!done)
{
// Fetch the payload, and see if this was the last one.
done = radio.read( &got_time, sizeof(unsigned long) );
// Spew it
printf("Got response %lu, round-trip delay: %lu\n\r",got_time,millis()-got_time);
}
// Begin listening again
radio.startListening();
}
// Try again later
digitalWrite(led_pin,HIGH);
delay(3000);
digitalWrite(led_pin,LOW);
}
//
// Pong back role. Receive each packet, dump it out, and send it back
//
if ( role == role_pong_back )
{
// if there is data ready
if ( radio.available() )
{
// Dump the payloads until we've gotten everything
unsigned long got_time;
boolean done = false;
while (!done)
{
// Fetch the payload, and see if this was the last one.
done = radio.read( &got_time, sizeof(unsigned long) );
// Spew it
printf("Got payload %lu...",got_time);
}
// First, stop listening so we can talk
radio.stopListening();
//delay(250);
// necessary to flush the ack packet out
// but kills the entire tx queue, which I might not
// want in the future!!
radio.flush_tx();
// Send the final one back.
radio.write( &got_time, sizeof(unsigned long) );
printf("Sent response.\n\r");
// Now, resume listening so we catch the next packets.
radio.startListening();
//delay(250);
// Add an ack packet for the next time around
static unsigned id = 0;
static char pl_buffer[10];
memset(pl_buffer,' ',10);
pl_buffer[9] = 0;
snprintf(pl_buffer,10,"id %04x",id++);
radio.writeAckPayload( 1, pl_buffer, 10 );
}
}
}
// vim:ai:cin:sts=2 sw=2 ft=cpp