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nordic_fob example fully working.
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@maniacbug
maniacbug committed Jan 5, 2012
1 parent 36167a9 commit d1653e8
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213 changes: 67 additions & 146 deletions examples/nordic_fob/nordic_fob.pde
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/*
Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
Copyright (C) 2012 J. Coliz <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
* Example Nordic FOB Receiver
*
* 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.
* This is an example of how to use the RF24 class to receive signals from the
* Sparkfun Nordic FOB. See http://www.sparkfun.com/products/8602 .
* Thanks to Kirk Mower for providing test hardware.
*/

#include <SPI.h>
#include <RF24.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"

//
Expand All @@ -26,96 +25,53 @@

// Set up nRF24L01 radio on SPI bus plus pins 9 & 10

RF24 radio(9,10);

// sets the role of this unit in hardware. Connect to GND to be the 'pong' receiver
// Leave open to be the 'ping' transmitter
const int role_pin = 7;
RF24 radio(8,9);

//
// Topology
// Payload
//

// Radio pipe addresses for the 2 nodes to communicate.
const uint64_t pipes[2] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL };
struct payload_t
{
uint8_t buttons;
uint16_t id;
uint8_t empty;
};

const char* button_names[] = { "Up", "Down", "Left", "Right", "Center" };
const int num_buttons = 5;

//
// 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
// Forward declarations
//

// 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"};
uint16_t flip_endian(uint16_t in);

// The role of the current running sketch
role_e role;
//
// Setup
//

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(57600);
printf_begin();
printf("\n\rRF24/examples/pingpair/\n\r");
printf("ROLE: %s\n\r",role_friendly_name[role]);
printf("\r\nRF24/examples/nordic_fob/\r\n");

//
// Setup and configure rf radio
// Setup and configure rf radio according to the built-in parameters
// of the FOB.
//

radio.begin();

// optionally, increase the delay between retries & # of retries
radio.setRetries(15,15);

// optionally, reduce the payload size. seems to
// improve reliability
radio.setPayloadSize(8);

//
// 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]);
}
radio.setChannel(2);
radio.setPayloadSize(4);
radio.setAutoAck(false);
radio.setCRCLength(RF24_CRC_8);
radio.openReadingPipe(1,0xE7E7E7E7E7LL);

//
// Start listening
Expand All @@ -130,91 +86,56 @@ void setup(void)
radio.printDetails();
}

//
// Loop
//

void loop(void)
{
//
// Ping out role. Repeatedly send the current time
// Receive each packet, dump it out
//

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);
bool ok = radio.write( &time, sizeof(unsigned long) );

if (ok)
printf("ok...");
else
printf("failed.\n\r");

// 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 > 200 )
timeout = true;

// Describe the results
if ( timeout )
{
printf("Failed, response timed out.\n\r");
}
else
{
// Grab the response, compare, and send to debugging spew
unsigned long got_time;
radio.read( &got_time, sizeof(unsigned long) );

// Spew it
printf("Got response %lu, round-trip delay: %lu\n\r",got_time,millis()-got_time);
}

// Try again 1s later
delay(1000);
}

//
// 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;
bool done = false;
while (!done)
{
// Fetch the payload, and see if this was the last one.
done = radio.read( &got_time, sizeof(unsigned long) );
// Get the packet from the radio
payload_t payload;
radio.read( &payload, sizeof(payload) );

// Spew it
printf("Got payload %lu...",got_time);
// Print the ID of this message. Note that the message
// is sent 'big-endian', so we have to flip it.
printf("#%05u Buttons ",flip_endian(payload.id));

// Delay just a little bit to let the other unit
// make the transition to receiver
delay(20);
// Print the name of each button
int i = num_buttons;
while (i--)
{
if ( ! ( payload.buttons & _BV(i) ) )
{
printf("%s ",button_names[i]);
}
}

// First, stop listening so we can talk
radio.stopListening();

// Send the final one back.
radio.write( &got_time, sizeof(unsigned long) );
printf("Sent response.\n\r");
// If no buttons, print None
if ( payload.buttons == _BV(num_buttons) - 1 )
printf("None");

// Now, resume listening so we catch the next packets.
radio.startListening();
printf("\r\n");
}
}
}

//
// Helper functions
//

// Change a big-endian word into a little-endian
uint16_t flip_endian(uint16_t in)
{
uint16_t low = in >> 8;
uint16_t high = in << 8;

return high | low;
}

// vim:cin:ai:sts=2 sw=2 ft=cpp

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